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SERIES 60 SERVICE MANUAL
12.2.1
Slave Piston Adjustment (Jake Brake® Lash)
Refer to information listed in Table 12-4 for the correct slave piston adjustment specification.
NOTICE:
The slave piston adjustment procedure must be strictly followed.
Failure to use the proper adjustment procedure will result in poor
engine brake performance, serious engine damage, or both.
NOTE:
Slave piston clearance settings for the different engine models are not the same.
MODEL NUMBER/DISPLACEMENT/MODEL YEAR
ENGINE BRAKE
SLAVE PISTON ADJUSTMENT
6067WU40 11.1L PRE - 1991
760/760A
0.660 mm (0.026 in.)
6067GU40 12.7L PRE - 1991
760/760A
0.508 mm (0.020 in.)
6067WU60 11.1L 1991 - 93
760A
0.660 mm (0.026 in.)
6067GU60 12.7L 1991 - 93
765
0.660 mm (0.026 in.)
6067WK60 11.1L 1994 - 97
760A
0.660 mm (0.026 in.)
6067GK60 12.7L 1994 - 97
765
0.660 mm (0.026 in.)
6067WK28 11.1L 1994 - 97
760A
0.660 mm (0.026 in.)
6067GK28 12.7L 1994 - 97
765
0.660 mm (0.026 in.)
6067EK60 11.1L 1998 DDEC IV
760B
0.6584 mm (0.023 in.)
6067PK60 12.7L 1998 DDEC IV
765A
0.6584 mm (0.023 in.)
6067TK60 12.7L 1998 DDEC IV
765A
0.6584 mm (0.023 in.)
6067FK6X, 6067BK6X, 6067HK6X
14L 1999 DDEC IV
770
0.6584 mm (0.023 in.)
6067MK6X 12.7L 1999 DDEC IV
770
0.6584 mm (0.023 in.)
6067LK6X 11.1L 1999 DDEC IV
760B
0.6584 mm (0.023 in.)
6067MK28, 6067MK45, 6067MK57,
6067MK60 — 12.7L Standard
— 2000
790
0.660 mm (0.026 in.)
6067BK28, 6067BK45, 6067BK57,
6067BK60 — 12.7L Premium – 2000
790
0.660 mm (0.026 in.)
6067HK45, 6067HK60 — 14L
U.S. — 2000
790A
0.660 mm (0.026 in.)
6067WK28, 6067WK60 —
11.1L — 2000
790B
0.660 mm (0.026 in.)
6067LK28, 6067LK45, 6067LK60
— 11.1L — 2000
790B
0.660 mm (0.026 in.)
All information subject to change without notice.
6SE483 0204 Copyright © 2002 DETROIT DIESEL CORPORATION
From Bulletin 6-60-02
12-15
12.2
VALVE LASH, INJECTOR HEIGHT (TIMING) AND JAKE BRAKE® LASH ADJUSTMENTS
MODEL NUMBER/DISPLACEMENT/MODEL YEAR
ENGINE BRAKE
SLAVE PISTON ADJUSTMENT
6063GK60, 6067GK28, 6067GK45,
6067GK91, 6067PK62, 6067TK28,
6067TK60, 6067TK62 — 12.7L
— 2000
790B
0.660 mm (0.026 in.)
6067HK62 — 14L Australian — 2000
790C
0.660 mm (0.026 in.)
6067MK28, 6067MK45, 6067MK57,
6067MK60 — 12.7L Standard
— 2000
795
0.813 mm (0.032 in.)
6067BK28, 6067BK45, 6067BK57,
6067BK60 — 12.7L Premium – 2000
795
0.813 mm (0.032 in.)
6067HK45, 6067HK60 — 14L
U.S. — 2000
795
0.813 mm (0.032 in.)
6067WK28, 6067WK60 —
11.1L — 2000
795
0.813 mm (0.032 in.)
6067LK28, 6067LK45, 6067LK60
— 11.1L — 2000
795
0.813 mm (0.032 in.)
6063GK60, 6067GK28, 6067GK45,
6067GK91, 6067PK62, 6067TK28,
6067TK60, 6067TK62 — 12.7L
— 2000
795
0.813 mm (0.032 in.)
6067HK62 — 14L Australian — 2000
795
0.813 mm (0.032 in.)
X= Any digit.
Table 12-4
Jake Brake® Models and Slave Piston Settings
NOTE:
Make the following adjustment with the engine stopped and cold with oil temperature
140 F (60 C) or below. The exhaust valves on the cylinder to be adjusted must be
in the closed position (rocker arm loose).
Adjustments must be made with the engine stopped and cold with the oil temperature at 60 C
(140 F) or below. Exhaust valves on the cylinder must be in the closed position (rocker arm roller
should be on the base circle of the camshaft).
12-16
From Bulletin 6-60-02
All information subject to change without notice.
6SE483 0204 Copyright © 2002 DETROIT DIESEL CORPORATION
SERIES 60 SERVICE MANUAL
NOTICE:
The slave piston adjustment procedure must be followed exactly.
Failure to properly adjust Jake Brakes® will result in inefficient
engine brake performance and may lead to severe engine or
Jake Brake® damage.
1. Back out the bridge leveling screw in the slave piston assembly until the end of the screw
is beneath the surface of the bridge in the slave piston assembly. See Figure 12-15.
1. Rocker Arm Adjusting Screw and Locknut
4. Bridge Leveling Screw Locknut
2. Slave Piston Adjusting Screw
5. Bridge
3. Locknut
Figure 12-15
Adjusting Slave Piston Screw-Except 790/795
2. Place the required feeler gage listed in Table 12-4 between the solid side of the bridge (the
side without the leveling screw) and the exhaust rocker arm adjusting screw.
All information subject to change without notice.
6SE483 0204 Copyright © 2002 DETROIT DIESEL CORPORATION
From Bulletin 6-60-02
12-17
12.2
VALVE LASH, INJECTOR HEIGHT (TIMING) AND JAKE BRAKE® LASH ADJUSTMENTS
NOTE:
The slave piston adjusting screws used in the Series 60 engine brake prior to August
1994 were reset screws. Reset screws are not to be dissembled in the field. Effective
with August 1994 engines, reset screw assemblies were replaced with Power-Lash®
assemblies.
Power-Lash® is a registered trademark of Jacobs Vehicle Systems™.
3. Turn the slave piston adjusting screw clockwise until a light drag is felt on the feeler gage.
4. Hold the screw in this position and torque the locknut to 34 N·m (25 lb·ft). Remove
the feeler gage.
5. Place the feeler gage from step 4 between the leveling screw and the rocker arm adjusting
screw. Turn the leveling screw clockwise until a light drag is felt on the feeler gage.
See Figure 12-16.
Figure 12-16
Adjusting Leveling Screw
6. Hold the leveling screw in this position and torque the locknut to 47 N·m (35 lb·ft).
7. Repeat the adjustment procedures in steps 1 through 6 for the remaining cylinders. Rotate
the engine when necessary to put the exhaust valves in the closed position for slave
piston adjustment.
12-18
From Bulletin 6-60-02
All information subject to change without notice.
6SE483 0204 Copyright © 2002 DETROIT DIESEL CORPORATION
SERIES 60 SERVICE MANUAL
Adjust Model 790/795 Jake Brake® slave piston lash as follows:
1. Turn in the adjusting screw until the solid side of the slave piston bridge assembly, contacts
the exhaust valve and the valve springs begin to compress, then turn in one additional turn.
NOTE:
Wait at least 30 seconds for oil to be purged from the J-Lash adjusting screw. If oil is
below room temperature (below 16 C [60 F]), wait at least two minutes for oil to be
purged from the J-Lash adjusting screw.
NOTICE:
Serious engine damage may occur from improper lash setting.
2. Using a 3/16 in. hex wrench, back out the adjusting screw ONLY until the correct size
feeler gage ( listed in Table 12-4) can be inserted between the solid side of the slave piston
bridge assembly and the exhaust valve. See Figure 12-16a.
1. J-Lash Adjusting Screw
3. Exhaust Valve Spring
2. Slave Piston
Figure 12-16a
Setting Slave Piston Lash
All information subject to change without notice.
6SE483 0204 Copyright © 2002 DETROIT DIESEL CORPORATION
From Bulletin 6-60-02
12-18a
12.2
VALVE LASH, INJECTOR HEIGHT (TIMING) AND JAKE BRAKE® LASH ADJUSTMENTS
3. Adjust the adjusting screw so that a light drag is felt on the feeler gage. Do not back out
the adjusting screw more than required to obtain a light drag on the feeler gage. Use a
screwdriver to hold the adjusting screw in place and torque the lock nut to 38 N·m (28
lb·ft.). See Figure 12-16a.
NOTE:
If the J-Lash adjusting screw is backed out until it no longer compresses the slave piston
spring, oil will enter the screw and the adjustment will be incorrect. If this occurs, repeat
step 2 and step 3 .
NOTE:
For Model 795 applications, skip to step 4.
4. Hold the solid adjusting screw in place and torque the locknut to 38 N·m (28 lb·ft).
5. Recheck lash settings. If lash setting is incorrect, repeat step 1 through step 3.
NOTE:
Once the engine brake has been run, you will not be able to check the engine brake
adjustments for engines using J-Lash™ adjusting screws. This is due to oil retained in
the J-Lash™ adjusting screw. If unsure of the adjustment, repeat step 1 and step 4 .
6. Repeat step 1 through step 5 for the remaining slave piston on the same cylinder.
7. Repeat step 1 through step 5 for the remaining cylinders.
To avoid injury, wear a face shield or goggles.
To avoid injury from fire, contain and eliminate leaks of
flammable fluids as they occur. Failure to eliminate leaks
could result in fire.
8. Install all remaining components that were removed for this procedure.
NOTE:
Ensure that all wires are away from moving parts.
9. Complete the installation by installing the rocker cover. Refer to section 1.6.
10. Start and drive the vehicle to verify proper Jake Brake® performance.
12-18b
From Bulletin 6-60-02
All information subject to change without notice.
6SE483 0204 Copyright © 2002 DETROIT DIESEL CORPORATION
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