- S&S Cycle
®
Instruction 51-1047
12-15-08
S&S Cycle, Inc.
235 Causeway Blvd.
La Crosse, Wisconsin 54603
Copyright © 2003, 2004, 2006, 2008
Phone: 608-627-1497 • Fax: 608-627-1488
by S&S Cycle, Inc.
Technical Service Phone: 608-627-TECH (8324)
Technical Service Email: [email protected]
Website: www.sscycle.com
All rights reserved.
Printed in the U.S.A.
Because every industry has a leader
Installation Instructions: S&S® Gear Drive Cams
for Harley-Davidson® Twin Cam 88® Engines
DISCLAIMER:
IMPORTANT NOTICE:
S&S parts are designed for high performance, off road, racing
applications and are intended for the very experienced rider only. The
installation of S&S parts may void or adversely effect your factory
warranty. In addition such installation and use may violate certain
federal, state, and local laws, rules and ordinances as well as other laws
when used on motor vehicles used on public highways, especially in
states where pollution laws may apply. Always check federal, state, and
local laws before modifying your motorcycle. It is the sole and exclusive
responsibility of the user to determine the suitability of the product for
his or her use, and the user shall assume all legal, personal injury risk and
liability and all other obligations, duties, and risks associated therewith.
Statements in this instruction sheet preceded by the following words
are of special significance.
The words Harley®, Harley-Davidson®, H-D®, Sportster®, Evolution®, and
all H-D part numbers and model designations are used in reference only.
S&S Cycle is not associated with Harley-Davidson, Inc.
S&S recommends you take special notice of these items.
SAFE INSTALLATION AND OPERATION RULES:
Before installing your new S&S part it is your responsibility to read and
follow the installation and maintenance procedures in these
instructions and follow the basic rules below for your personal safety.
Gasoline is extremely flammable and explosive under certain
conditions and toxic when breathed. Do not smoke. Perform
installation in a well ventilated area away from open flames or sparks.
If motorcycle has been running, wait until engine and exhaust pipes
have cooled down to avoid getting burned before performing any
installation steps.
Before performing any installation steps disconnect battery to
eliminate potential sparks and inadvertent engagement of starter while
working on electrical components.
Read instructions thoroughly and carefully so all procedures are
completely understood before performing any installation steps.
Contact S&S with any questions you may have if any steps are unclear
or any abnormalities occur during installation or operation of
motorcycle with a S&S part on it.
Consult an appropriate service manual for your motorcycle for correct
disassembly and reassembly procedures for any parts that need to be
removed to facilitate installation.
Use good judgment when performing installation and operating
motorcycle. Good judgment begins with a clear head. Don't let
alcohol, drugs or fatigue impair your judgment. Start installation when
you are fresh.
Be sure all federal, state and local laws are obeyed with the
installation.
For optimum performance and safety and to minimize potential
damage to carb or other components, use all mounting hardware that
is provided and follow all installation instructions.
Motorcycle exhaust fumes are toxic and poisonous and must not
be breathed. Run motorcycle in a well ventilated area where fumes
can dissipate.
WARNING
Means there is the possibility of injury to yourself or others.
CAUTION
Means there is the possibility of damage to the part or motorcycle.
NOTE
Other information of particular importance has been placed in italic type.
WARRANTY:
All S&S parts are guaranteed to the original purchaser to be free of
manufacturing defects in materials and workmanship for a period of
twelve (12) months from the date of purchase. Merchandise that fails
to conform to these conditions will be repaired or replaced at S&S’s
option if the parts are returned to us by the purchaser within the 12
month warranty period or within 10 days thereafter.
In the event warranty service is required, the original purchaser must
call or write S&S immediately with the problem. Some problems can be
rectified by a telephone call and need no further course of action.
A part that is suspect of being defective must not be replaced by a
Dealer without prior authorization from S&S. If it is deemed necessary
for S&S to make an evaluation to determine whether the part was
defective, a return authorization number must be obtained from S&S.
The parts must be packaged properly so as to not cause further damage
and be returned prepaid to S&S with a copy of the original invoice of
purchase and a detailed letter outlining the nature of the problem, how
the part was used and the circumstances at the time of failure. If after
an evaluation has been made by S&S and the part was found to be
defective, repair, replacement or refund will be granted.
ADDITIONAL WARRANTY PROVISIONS:
(1) S&S shall have no obligation in the event an S&S part is modified by
any other person or organization.
(2) S&S shall have no obligation if an S&S part becomes defective in
whole or in part as a result of improper installation, improper
maintenance, improper use, abnormal operation, or any other misuse
or mistreatment of the S&S part.
(3) S&S shall not be liable for any consequential or incidental damages
resulting from the failure of an S&S part, the breach of any warranties,
the failure to deliver, delay in delivery, delivery in non-conforming
condition, or for any other breach of contract or duty between S&S and
a customer.
(4) S&S parts are designed exclusively for use in Harley-Davidson® and
other American v-twin motorcycles. S&S shall have no warranty or
liability obligation if an S&S part is used in any other application.
1
Specification for S&S® Gear Drive Camshaft for Harley-Davidson® Twin Cam 88® Engines
Cam
Name
Valve Timing
Open / Close
Valve Duration
Intake
Exhaust
Intake
Exhaust
510G
20°/ 38°
52° / 20°
238°
252°
570G
20°/ 40°
55° / 20°
240°
585G
20°/ 45°
60° / 20°
625G
20°/ 55°
640G
25°/ 60°
Centerline
Valve
Lift
Lift @ TDC
Intake
Exhaust
Intake
Exhaust
.510"
99°
106°
.187"
.179"
255°
.570"
100°
107.5°
.187"
.179"
245°
260°
.585"
102.5°
110°
.186"
.179"
60° / 20°
255°
260°
.625"
107.5°
110°
.189"
.184"
65° / 25°
265°
270°
.640"
107.5°
110°
.228"
.214
Chart 1
INTRODUCTION
The S&S® gear drive cams offer many advantages over the
original cam chain drive system:
Reduced maintenance. There are no chain guides or shoes to
wear or replace and no debris from wearing guides or shoes
in your engine oil.
Consistent cam timing. Cam gears are keyed with a light
press fit. Chain and tensioner induced variations are no
longer a problem.
Eliminating the chains and tensioners eliminates excessive
side loading of cam bearings.
Critical sprocket alignment is unnecessary. Use of precision
machined spacers is eliminated.
Maintain accurate valve timing when using high
performance valve springs with higher spring forces.
Higher cam lifts can be used without decreasing cam base
circle. Gear driven rear cam rotates in opposite direction
from chain driven cam. Lobes on front and rear cams never
point toward each other, allowing increased lobe height.
If stock Harley-Davidson heads are decked, valve to piston
clearance must be checked. If insufficient clearance is found,
valve pockets must be modified.
When using S&S pistons with S&S heads which are
unmodified or have been decked no more than .062", no
additional valve to piston clearancing will be required.
Valve to Piston Clearance Chart
Stock Harley-Davidson® Pistons*
Cam
Head
Style
510G
570G
585G
625G
640G
Stock
OK
OK
OK
OK
1
S&S 79cc
OK
OK
OK
1
1
S&S 89cc
2
2
2
2
2
Chart 2
* Using unmodified heads with .045" head gaskets.
COMPATIBILTY NOTES:
S&S Gear Drive Cams are not compatible with camshafts
designed for the stock chain cam drive. S&S Gear Drive Cams
must be used with S&S gear drive camshafts.
Except for the 510G, the gear driven camshaft kits are not
compatible with stock pushrods or valve springs. S&S
adjustable pushrod kit 93-5095 is recommended for engines
with stock length cylinders. Longer pushrods are available
for engines with longer than stock cylinders. See the S&S
catalog for pushrods and valve springs.
S&S Camshaft Installation Kit 33-5163 is strongly
recommended when installing S&S gear drive cams. The
kit includes gaskets and bearings required for installation,
but does not include oil pump o-rings.
CAUTION
All S&S gear drive cams except for the 510G require that the
stock valve springs be replaced with high lift spring kits.
Some high lift spring kits require clearance checks and may
require cylinder head modifications to prevent contact
between top collar and valve seal, and to achieve correct
installed height. See the instructions with your spring kit for
exact specifications.
2
When using S&S gear drive cam shafts with stock HarleyDavidson pistons, valve-to-piston clearance may need to be
checked. See Chart 2.
OK No Clearancing needed.
1 Valve to piston clearances must be checked.
2 Valve pockets in pistons must be modified.
INSTALLATION
1.
Remove Cam Chain Drive
NOTES:
Changing camshafts and cam drives in Twin Cam 88 engines
is different than in previous engines. Procedure requires use
of a hydraulic press and some special tools. Installation
should be done by an experienced mechanic with access to a
factory service manual and all required tools.
Tighten all fasteners to correct specifications and in order
described. Always use an accurate torque wrench.
CAUTION
Incorrect installation can cause engine damage not covered
under warranty.
WARNING
Failure to install components correctly can result in sudden
engine seizure. Engine seizure may result in serious injury to
motorcycle operator, passenger, or others.
Picture 2
Picture 1
A.
Disconnect battery ground cable to eliminate potential
sparks and inadvertent engagement of starter while
working on motorcycle.
B.
Remove spark plugs and pushrod cover clips. Collapse
pushrod covers to expose pushrods.
C.
Safely elevate and stabilize rear of motorcycle. Place
transmission in high gear. Turn rear wheel to rotate
engine until both lifters and pushrods for either cylinder
are at lowest point on camshaft (TDC of compression
stroke). Both intake and exhaust pushrods for that
cylinder will not be under pressure from the valve
springs and will rotate with light finger pressure.
NOTE: 510G camshafts may use stock style non-adjustable
pushrods instead of adjustable pushrods. If installing nonadjustable pushrods, disassemble and assemble rocker box per
Harley-Davidson instructions. All other S&S gear drive cams
require installing adjustable pushrods. As a time-saving
measure, the stock pushrods can be removed with bolt cutters.
Be sure to heed cautions and warnings in these instructions.
D.
Cut pushrods for cylinder that is at TDC with bolt cutter
and remove pushrods and pushrod covers from engine.
Rotate engine to place pushrods for other cylinder at
their lowest point. Cut and remove remaining pushrods.
Picture 3
CAUTION
Cutting pushrods with a saw or cutoff wheel may result in
debris entering engine, causing extensive engine damage not
covered under warranty.
WARNING
Cutting pushrods without releasing spring pressure, by
rotating engine until tappets are at lowest point of travel, can
result in bodily injury.
E.
Remove pushrod and lifter covers from crankcase.
F.
Remove engine cam cover and gasket. It is not necessary
to remove ignition sensor from cover. Secure lifters with
a tool made from a large binder clip. See Picture 1.
G.
Remove bolts and washers from cam drive sprocket and
crankshaft sprocket.
NOTE: S&S recommends using Harley-Davidson sprocket
locking tool H-D #42314 to secure sprockets while bolts are
being removed. See Picture 2.
H.
Use Harley-Davidson® cam chain tensioner unloader
H-D® #42313 to move tensioner away from primary
cam chain. Secure tensioner with retention pin. See
Picture 3.
Picture 4
All references to Harley-Davidson® part numbers is for identification purposes only. We in no way are implying that any of S&S® Cycle’s
products are original equipment parts or that they are equivalent to the corresponding Harley-Davidson® part number shown.
3
Figure 1
Figure 2
I.
Working gradually around edge of each sprocket,
carefully pry sprockets loose. Remove sprocket and
chain assembly.
J.
Remove chain guide. See Picture 4.
K.
Following sequence shown, alternately loosen and
remove oil pump bolts. See Figure 1.
L.
Following sequence shown, alternately loosen and
remove cam support plate bolts. See Figure 2.
Failure to remove and install bolts according to correct procedure
may result in parts damage not covered under warranty.
All references to Harley-Davidson® part numbers is for
identification purposes only. We in no way are implying that
any of S&S® Cycle’s products are original equipment parts or
that they are equivalent to the corresponding HarleyDavidson® part number shown.
NOTE: It is not necessary to remove oil pump from engine to
complete this installation unless grinding in gear case must be
performed for clearancing. If grinding is to be done all gear case
components must be removed and all holes taped off with duct
tape to avoid contamination of engine with chips.
N.
Use Harley-Davidson® cam chain tensioner unloader
H-D® #42313 to move tensioner away from secondary
cam chain. Secure tensioner by inserting second
retention pin through front of support plate.
O. Remove bearing retainer screws and bearing retainer
from cam support plate.
P.
With cam support plate positioned securely in a
hydraulic press, use Harley-Davidson® camshaft
remover/installer H-D® #43644 to press both camshafts
and bearings from support plate simultaneously.
NOTES:
Cam bearings may have a loose fit in cam support plate.
Camshaft and bearing assemblies may drop out when
beginning pressing procedure. Camshafts with roller style
bearings will be loose and drop out of support plate.
4
The S&S Gear Drive Cams require that ball bearings be used
for both front and rear camshaft outer bearings. The roller
bearing used for the rear camshaft in some stock engines has
too much internal clearance. This allows center to center
distance of gears to vary, causing excessive gear noise. Since
the gear drive does not exert a large side load on the rear
camshaft, the higher load handling capacity of the roller
style bearing is not required.
Q. Use Harley-Davidson® cam chain tensioner unloader H-D®
#42313 to remove retention pin from either tensioner.
Allow tensioner to completely relax. Remove retaining
ring and tensioner assembly from cam support plate.
Repeat this procedure for remaining tensioner.
CAUTION
M. Carefully remove cam support plate assembly from case.
Figure 3
2.
Install Gear Drive Cams
CAUTION
Check pinion shaft runout. Indicate end of pinion shaft at cam
support plate bushing surface and rotate engine; reading must
be .003” or less total indicated reading (TIR). If reading is greater
than .003” TIR the crankshaft must be repaired or replaced to
correct excess runout before installing gear drive cams. Failure to
correct excess runout may lead to engine damage not covered
under S&S warranty.
NOTE: Do not reuse cam bearings. If S&S Camshaft Installation Kit
33-5163 is not being used, new bearings should be obtained from
another source and installed with new camshafts. The S&S Gear
Drive Cams require that ball bearings be used for both front and
rear camshaft outer bearings.
A. Apply assembly lube to outer races of cam bearings and
bearing bores in support plate. With cam support plate
positioned securely in a hydraulic press, use HarleyDavidson® camshaft remover/installer H-D® #43644 to
install both bearings. See Picture 5.
NOTE: Check clearance between bearing retainer and woodruff
keys securing inner gears to cams. Remove material from
retainer, to provide .030" clearance between key and retainer.
See Picture 6.
B.
Align hole in bearing retainer with oil passage in
support plate. Install bearing retainer screws with a
drop of blue Loctite® threadlock 242 or 243 and
tighten screws to 20-30 in-lbs. torque.
Picture 5
If additional clearance is required, remove
material from areas indicated to provide
.030" clearance between key and retainer.
E.
When using 585G, 625G, or 640G camshafts (33-5168,
33-5170, or 33-5172) clearance between pinion bearing
boss and rear cam lobe must be checked. See Pictures
7 & 8. Remove just enough material to provide .030"
clearance between top of cam lobe and pinion bearing
boss when camshaft is rotated in inner needle bearing.
Also check clearance between all cam lobes and tappet
guide bosses. To avoid contamination of engine with
chips, we recommend that all holes in the gear case be
taped off with duct tape and that gear case be
thoroughly cleaned with parts cleaner or solvent after
clearancing is performed.
F.
Carefully remove camshaft needle bearings from
crankcase with Harley-Davidson® camshaft needle
bearing remover/installer H-D® #42325, and replace
them with new bearings provided in S&S Camshaft
Installation Kit 33-5163, or with bearings from
another source. Cam bearings must be Torrington
B148 full complement bearing or equivalent.
NOTE: Before reinstalling cam support plate, make sure oil
pump O-rings are in good condition and remain in place
during following procedure. Replace worn or damaged O-rings
if necessary.
G.
Picture 6
C.
Apply assembly lube to outer bearing surface of front
(shorter) camshaft and inner race of front bearing.
Support bearing by inner race and press camshaft all
the way into bearing. Install retaining ring on outer
end of front camshaft.
NOTE: Do not reuse retaining ring. If S&S Camshaft Installation
Kit 33-5163 is not being used, a new retaining ring be obtained
from another source and installed with new camshaft.
D.
Apply assembly lube to outer bearing surface of rear
(longer) camshaft and inner race of rear bearing.
Support bearing by inner race and with camshaft gear
timing marks aligned (See Figure 3), press camshaft all
the way into bearing.
All references to Harley-Davidson® part numbers is for
identification purposes only. We in no way are implying that any
of S&S® Cycle’s products are original equipment parts or that they
are equivalent to the corresponding H-D® part number shown.
Picture 7
Apply a thin layer of assembly lube to cam journals, lobe
surfaces, and inner bearing surfaces. Align camshafts
with needle bearings and carefully slide support plate
over crankcase dowels.
NOTE: Support plate assembly should slide into place without
resistance. If resistance is encountered, determine cause and
correct problem before proceeding. Do not force support
plate into position!
H.
Loosely install support plate screws with a drop of
Loctite® threadlock 242 or 243 (blue). Alternately
tighten screws to 95 in-lbs. torque following sequence
shown. See Figure 2.
CAUTION
Support plate screws that pass through alignment dowels (See
positions 1 & 2 in Figure 2) can be easily stripped when
applying maximum 120 in-lbs. torque as recommended by
Harley-Davidson®.
Picture 8
5
Figure 4
I.
Install oil pump mounting bolts with a drop of Loctite®
threadlock 242 or 243 (blue) according to procedure
found in factory service manual: Gently bottom screws,
then back them out 1⁄4 turn. Center oil pump by rotating
engine by hand while snugging down screws.
Alternately tighten bolts to 95 in-lbs. torque in
sequence shown. See Figure 1. Before moving
forward, verify that inner drive gears rotate freely
and no binding is present.
NOTE: Crankshaft and cam drive gears have a light press fit on
their respective shafts. Start gears squarely on their shafts and use
their mounting bolts to pull them all the way into position.
NOTE: Make sure that no metal burrs are raised when installing
the gear sets. Burrs can form underneath the gear causing
excessive gear run out.
Checking the inner cam gear and outer drive gear sets for
backlash:
It is important to check the inner 31 teeth gear set and the
outer drive gear set (pinion 31 teeth gear and cam drive 62
teeth gear) for the correct backlash before installing the rest of
the valve train components. Backlash, the measure of free play
between the gear set, must be checked with no loading applied
to the cams and in the four different camshaft positions. To
check the backlash of the inner cam gears, lock the front cam
into a position by applying a force to the cam lobe. Measure the
backlash by moving the rear cam set back and forth. To check
backlash in the outer drive gear set, rotate the 62 teeth cam
drive gear back and forth while keeping the pinion gear locked
in one place with the engine. The minimal required backlash for
the gear sets should be between .0005” and .001”and no more
than .002” for cold gears. The both gear sets should roll freely
with no radial or axial binding. If when checking backlash the
gear mesh shows less than .0005” of backlash then a smaller
crankshaft gear size 33-4160X for the outer gears or 33-4272RX
for the inner gears should be used. Gear sets with less than
.0005” of backlash may whine when run and can cause tooth
wear excessive heat generation and gear failure resulting in
engine damage. Gear backlash greater than .002” can cause
excessive gear noise or clicking caused by the reversing of the
forces applied by the lifter springs onto the gears, use the
oversized crankshaft gear 33-4160Z for the outer gears and
33-4272RZ for the inner gears to correct this condition.
J.
6
Place crankshaft gear on crankshaft with timing mark
outward. Apply a drop of red Loctite® threadlock 262,
271 or 272 to threads of 5⁄16"-18 x 3⁄4" Grade 8 crankshaft
gear bolt, provided in S&S® Camshaft Kit 33-5163 or
obtained from another source. Apply a drop of clean
Figure 5
20W-50 engine oil under bolt flange. Using the washer
removed in disassembly step G, install crankshaft gear
bolt and tighten to 25 ft-lbs. torque.
K.
If necessary, place transmission in high gear and turn
rear wheel to rotate engine until timing mark on
crankshaft gear is in position. See Figure 4.
L.
Place drive gear key in rear camshaft. Position cam drive
gear on rear camshaft and key with timing mark outward.
Rotate drive gear and camshafts until drive gear and
crankshaft gear timing marks are aligned. See Figure 4.
M. Apply a drop of red Loctite® threadlock 262, 271 or 272
to threads of 3⁄8"-24 x 1.75 Grade 8 cam drive gear bolt.
Apply a drop of clean 20W-50 engine oil under bolt
flange. Using thick washer provided, install cam drive
gear bolt and tighten to 34 ft-lbs. torque. Verify that out
gear drives rotate freely and no binding is present.
NOTE: Drive gear cams are slightly larger than stock drive
sprocket and needs to be checked for interference with cam
cover before proceeding.
N.
Press a small piece of clay or kneadable putty on cam
cover mounting boss shown. See Figure 5. Carefully hold
cover and cover gasket in position against crankcase.
Install mounting bolts (4) near corners of cover finger
tight. Push or tap cam cover towards front of engine.
O. Carefully remove cam cover. Determine cover-to-gear
clearance by measuring impression left in clay by gear at
its thinnest point. Clearance should be .030" or more.
If clearance is less than .030", or if cover contacts gear,
remove only enough material from cam cover to obtain
correct clearance. Repeat steps M and N if necessary.
CAUTION
Be careful not to grind too deeply and break through to the
outside of the cam cover. Damage to cam cover caused by
removing too much material is not covered under warranty.
P.
Use a new gasket and install cam cover. Tighten
cover bolts to 90-120 in-lbs. torque in sequence
shown. See Figure 6.
Q. Remove clips to release lifters. If necessary, place
transmission in high gear and turn rear wheel to rotate
engine until both lifters for front cylinder are at lowest
point on camshaft (TDC of compression stroke for
front piston).
6oq
Green Loctite®
Figure 7
Figure 6
R.
Loosen locknuts on adjustable pushrods and turn
adjusters to make all rods as short as possible.
S.
Longer S&S® pushrods are for exhaust valves, and
shorter ones are for intake. Pass one long and one short
pushrod through assembled pushrod covers. Place
pushrod and cover assemblies through lifter cover. Inner
tappet hole is for intake pushrod, and outer tappet hole
is for exhaust pushrod. While holding a new gasket
under lifter cover, install push rod, pushrod cover, lifter
cover, and gasket as an assembly on crankcase. Tighten
lifter cover screws to 95 in-lbs. torque.
NOTE: Pushrod adjustment. If using unmodified original
tappets perform steps 3-A thru 3-D to adjust pushrods. (See
below.) If S&S HL2T kit has been installed in tappets, proceed to
steps 4-A thru 4-F. (See next page.)
3.
Pushrod Adjustment Procedure
For Unmodified Stock Tappets
A.
Turn adjuster screw to lengthen exhaust pushrod until
pushrod has no vertical movement but still rotates with
light finger pressure. Extend pushrod by rotating
adjuster screw an additional 20 flats (31⁄3 revolutions) and
secure adjuster screw with locknut.
B.
Repeat step 2-S for intake pushrod.
C.
Front lifters should bleed down in 5-10 minutes,
allowing pushrods to be rotated with light finger
pressure. Extend pushrod covers and install cover clips.
CAUTION
Rotating engine before lifters have bled down may damage
pushrods and other components not covered under warranty.
E.
4.
Rotate engine until both lifters for rear cylinder are at
lowest point on camshaft (TDC of compression stroke
for rear piston). Repeat steps R-T for rear pushrods.
Pushrod Adjustment Procedure - for Tappets With HL2T
Kit Installed
A. Bring piston to TDC on compression stroke in cylinder to
be adjusted. Normally both tappets will be at their
lowest point of travel.
B.
Extend pushrod adjustment, collapsing lifter until piston
assembly is in contact with HL2T spacer and pushrod is
tight. If tappets contain oil, as when pushrods are
readjusted after engine has been run, or if all oil was not
removed during HL2T installation, extend pushrod
adjustment until valve is open (about five additional
turns of adjusting screw). Allow 5 minutes for hydraulic
unit to bleed down. If pushrod can be turned with
fingers after bleeding down, lifter is not completely
collapsed, and this step must be repeated.
NOTE: Perform this operation on one cylinder at a time. Do not
turn engine until pushrod adjustment is complete.
CAUTION
Turning engine while valve is held off the seat could result in
valve to valve or valve to piston contact and serious valve
train damage.
C.
Loosen pushrod adjustment until pushrod can be
rotated with the fingers with slight drag. Pushrod
now has zero lash.
NOTES:
Shortening pushrod adjuster an additional six flats or one
full turn from zero lash often results in quieter pushrod
operation. This provides additional travel for the
hydraulic piston assembly, which can improve the ability
of the hydraulic unit to maintain zero lash under normal
operating conditions.
Harley-Davidson Twin Cam 88 lifters require HL2T Kit 335339 for 1986 and later engines.
D.
Tighten lock nut and recheck pushrod adjustment to
insure that it is still correct.
E.
Follow the same procedure for all four push rods.
NOTES:
After a few hundred miles it is a good idea to recheck
pushrod adjustment in a new engine as valve train may
tighten up due to gasket compression and valve seat wear.
Upon initial start up after modification, HL2T equipped lifters
may be somewhat noisy for 10-20 miles. If lifters are still
noisy after 20 miles it is recommended that pushrods be
adjusted 1⁄2 turn looser.
7
F.
Replace any remaining parts removed to facilitate gear
drive cams installation. Check engine oil level. Start
engine and check for leaks.
NOTE: Engine may require several miles at normal operating
temperature for lifters to fill with oil and quiet valve train.
Service
If crankshaft or cam drive sprocket needs to be removed, S&S®
recommends using a small wheel puller like NAPA® #775-9064.
Loosen and unscrew gear bolt until bolt flange is about .600" from
shaft. To avoid damaging shaft internal threads, let puller screw
push against head of gear bolt until gear breaks free from shaft.
S&S® Gear Drive Cams Assembly Parts
1.
Gasket, Cam Cover ....................................................31-2032
2.
Bearing, Needle, Inner Cam (2)................................31-4080
3..
Bearing, Outer Cam, Ball..........................................31-4081
4.
Gear, Pinion ................................................................33-4160
5..
Gear, Cam Drive
(Includes reference #12, 13 & 16) ............................33-4271
6..
Gear, Camshaft, Front
(Includes reference #15)............................................33-4272F
7..
Gear, Camshaft, Rear
(Includes reference #15)............................................33-4272R
8..
9..
Kit, Gear Drive Cams
(Includes reference #4-7, 12, 13, 15 & 16) ..............33-4275
Kit, Gear Drive Cams Outer Gears
(Includes reference #4, 5, 12, 13 & 16)....................33-4276
10.. Kit, Chain Drive Camshaft Installation
(Includes reference #1-3, 11 & 14)...........................33-5163
11.. Screw, HHC ⁄16"-18 x ⁄4" .............................................50-0100
5
3
12.. Screw, SHC 3⁄8" -24 x 13⁄4"............................................50-0132
13.. Washer, Flat 3⁄8"x 11⁄8"x .225".....................................50-7056
14.. Ring, Retaining ..........................................................50-8061
15.. Key, Woodruff .125 x .5 (2).......................................50-8223
16.. Key, .188 x .150 x .57 .................................................50-8226
8
For replacement purposes, camshafts and camshaft gears are
available separately.
Use a hydraulic press to remove and install camshaft gears.
Always use new keys, 6oq green Loctite®, and make sure correct
gear is mated with correct camshaft. See Figure 7.
Timing marks on camshaft gears should face cam lobes.
17.. Camshaft, Front, 510G ..............................................33-5173F
Camshaft, Front, 570G ..............................................33-5165F
Camshaft, Front, 585G ..............................................33-5167F
Camshaft, Front, 625G ..............................................33-5169F
Camshaft, Front, 640G ..............................................33-5171F
18.. Camshaft, Rear, 510G................................................33-5173R
Camshaft, Rear, 570G................................................33-5165R
Camshaft, Rear, 585G................................................33-5167R
Camshaft, Rear, 625G................................................33-5169R
Camshaft, Rear, 640G................................................33-5171R
19.. Kit, Camshaft, 510G
(Includes reference #6, 7, 15, 17 & 18)....................33-5174
Kit, Camshaft, 570G
(Includes reference #6, 7, 15, 17 & 18)....................33-5166
Kit, Camshaft, 585G
(Includes reference #6, 7, 15, 17 & 18)....................33-5168
Kit, Camshaft, 625G
(Includes reference #6, 7, 15, 17 & 18)...................33-5170
Kit, Camshaft, 640G
(Includes reference #6, 7, 15, 17 & 18)....................33-5172
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