Supplemental Instructions for
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Supplemental Information & Instructions for
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231-710 or RFK10 Revotec Electric Fan Kit
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TR 2, 3, 3A, 4 Negative Ground Only
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Why an Electric Fan Kit?
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There are generally two reasons for considering an electric fan conversion. The Triumphs are not
well known for “keeping their cool” and anytime you boost performance, you generate more heat. If your
cooling system was adequate, modifications that boost horsepower will often push it over the edge. When
we started developing the Moss Supercharger System for the TR3-4A, we immediately ran into a problem
with cooling. Horsepower related cooling problems aside, modifications like the Moss Rack & Pinion
Conversion eliminate the stock fan altogether, so looking at fan options quickly becomes looking a electric
fan options. There are many to choose from, with wide differences in price. When choosing a fan for the
early TR, the first problem is the radiator- it is narrow. Add to that the limited room for a fan between the
radiator and the engine, and your choices are really limited. A quick survey of the available fan kits left us
looking for something with more air flow and better control. As luck would have it, our English R & D
group had already solved our problem.
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Why a Revotec Fan Kit?
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It is about value. Revotec and Moss Europe have co-designed a high quality, complete electric
fan kit specifically for the TR2-4. Most fan kits are “universal” in that they use fan blades that will pull or
push air so they can be mounted in front of or behind the radiator core. Such a fan is a real compromise
in terms of performance, but they are convenient and they keep the costs down. We found they just did
not move enough air. The Revotec fan in this kit is designed to pull air, not push it, and it moves a large
volume of air very efficiently, while drawing about 8.5 amps.
Every electric fan uses a temperature sensitive switch to turn the fan on. Most kits use a simple
contact sensor, or a probe that pokes through the radiator fins. Neither solution gives accurate readings,
but they are inexpensive. Revotec uses a temperature pickup in an aluminum sleeve installed in the
radiator hose. This unquestionably provides the fastest and most accurate readings. A short coupler hose
and hose clamps are included so you can easily install the sleeve. It is the best (and most costly) way to
plumb the sensor, but it is without a doubt the best way to do it. The kits also include an electronic
thermostatic controller to enable precise and easy adjustment of the temperature at which the fans come
on.
Unlike other fan kits that use universal mounting systems, this Revotec kit has custom designed
laser cut brackets that mount directly to the stock radiator mounts, making this kit specific to the
applications listed. We also include a set of “through-the-radiator” mounts so you can actually install the
fan without removing the nose section, should you prefer to do so.
This kit also includes the special bolt and spacer needed to replace the standard crank mounted
fan and fan extension. The list of the bits included in this kit is long, much longer and more specific than
any other kit on the market.
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Understanding Fan Performance Data
All fan manufacturers publish performance data. The real testing is done to industry standards,
generally using a AMCA Standard 210 Double Chamber. This measures how much air can the fan move,
and how much air the fan can move if the air flow is restricted. Air flow is measured in cubic meters per
hour (M3/h) and/or cubic feet per minute (cfm). Please refer to Appendix 1 (last page of these instructions)
The table starts off with a Static Pressure of zero, meaning there is no restriction on the airflow. This fan
will move 1250 cubic meters per hour, or 738 cubic feet per minute under those conditions. As the
restriction of the air flow increases, static pressure goes up and the fan moves less air. The reason this
second factor matters is that the air flow is restricted in an engine compartment after the air gets through
the radiator core. There are no “real world” comparisons of performance of various fans in a car, but this
table does provide is a way of comparing fans from different manufacturers, assuming that they are all
playing fair. Be wary of performance figures given without reference to static pressure; the numbers may
not reflect real world performance.
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Page 2 of 9
As with all instructions, please read through these carefully before you begin. If you feel that this project is
outside your “confidence zone”, please have the installation done by a professional, or enlist the
assistance of a fellow TR Club member. If you are not a member of a Club, consider joining. This is the
kind of project than many clubs would take on as a “Tech Session” for the benefit of the members. You
still have to do the work, but you will have help and knowledgeable advisors to assist.
Please use the illustrated list of components to inspect your kit. Identifying each piece now will make
assembly much easier. Should you find that you are missing a part, or if you believe you have received
something in error, please call Moss Technical Services at (805) 681-3411. Because the contents of this
kit are subject to periodic review and revision, any discrepancy noted is probably due to a change in the
kit and the content information is out of date. Nevertheless, we need to know so that the instructions may
be updated.
Contents of the Kit
1a
1b
1c
1d
1e
1g
1f
1a
1h
1i
1j
1k
1p
1l
1o
1q
1t
1r
1s
1n
1m
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Contents of the Kit (October 2010)
Ref Moss US
1a
NA
1b
NA
NA
1c
NA
1d
NA
1e
NA
1f
NA
1g
NA
1h
1i
1j
1k
1l
1m
1n
1o
1p
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Page 3 of 9
1q
1r
1s
1t
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
Moss Europe
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
TT11321
LWZ410
BH610121
Description
Wire, black
Female spade connectors
Black plastic plug for female spade connectors
Sleeve, black plastic
Bracket #1 (smaller of the 2)
Fasteners, for securing fan directly to radiator core
Fan Assembly
Female Spade connectors, insulated
Ring Connectors, insulated
Hose clamps, 32-50mm "Jubilee" (solid band, not perforated)
Zip-Ties, 10"
Hose, 1 1/2" ID x 2" long
Wiring, temp sensor/controller & fan power relay
Temp Sensor & Adjustable Electric Fan Controller (EFC)
Black Plug, for Controller
Relay, fan power
Wiring Clip
Screws, securing fan to brackets
Washers, for screws
Nyloc nuts, for screws
Bracket #2 (larger of the 2)
Spacer, Pulley to Crank
Washer, Star, internal tooth, 5/8
BOLT 5/8 UNF X 1.5IN
Qty
39"
2
1
1
1
4 sets
1
2
2
3
5
1
1
1
1
1
1
4
4
4
1
1
1
1
Converting your Triumph from Positive to Negative Ground
In order install an electric fan, your car will need to be converted to negative ground..
• Disconnect the battery cables and remove the battery
• If you have an original radio, remove it.
• If you have an ammeter, you’ll need to reverse the wires connected to it.
• Some non-original distributors may have a diode across the points rather than a condenser.
Reverse the connections to the diode.
• If you have converted to an electric fuel pump, make certain it can be reconfigured to work in a
negative ground electric system.
• Reverse the connections going to the ignition coil: Connect the (-) side of the coil to the wire
going to the distributor and the (+) side of the coil to the wire going to the ignition switch.
• Check the output of the heater fan; if it is reduced after the conversion, reverse the connections to
the heater fan motor.
• Take a look at the battery terminals, noting which one is negative. Replace the battery so that the
negative battery terminal is closest to the cable strap that attaches directly to the body/chassis.
This will be 180º from the orientation of the battery when you removed it.
• Re-polarize the Generator. Look at the two wires connected to the generator. Locate the F
terminal on the generator; it is the one the smaller brown with a green stripe wire is connected to.
Disconnect the two wires from the generator. Temporarily connect one end of a spare piece of
wire to the positive terminal of the battery. Touch the other end of this wire to the F terminal on
the generator several times, very briefly. You’ll get a few small sparks and that’s ok. This repolarizes the field windings so you get the proper output for a negative ground vehicle.
• Reconnect the battery, and reconnect the two wires to the generator they way they were before
your disconnected them. Verify that the charging system is functioning properly.
Note: It is not necessary to change the leads at the starter motor. The starter uses a series-wound
motor that will always rotate the correct way with either polarity.
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Installing the Fan
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For any TR2-4, the radiator must come out before you can remove the original fan and fan extension.
Pulling the radiator means the front apron of the TR2-3B body will have to be removed. Once the original
fan is gone, the electric fan can be mounted on the radiator.
Preparation – Removing the Original Fan (refer to your workshop manual)
• Disconnect the battery and drain the cooling system.
• TR2-3B: remove the front apron, bonnet & radiator.
• TR4: remove the radiator.
•
Remove the mechanical fan and fan extension. You will need a 1 1/8”
socket for the large bolt on the end of the fan extension. Once the center
bolt is loose, you can pull the entire assembly out and put it on the bench.
•
Loosen the six nuts securing the pulley (2a) and fan extension to the hub
(2c) using a 7/16” socket and combination wrench. New bolts (320-080)
and nyloc nuts (310-100) are available if needed.
•
Install the spacer (2d), lock washer (2e), and new center bolt (2f) supplied
in the kit.
•
Reinstall the six bolts, lock washers and nuts (2b), securing the two halves
of the pulley (2a) and the spacer (2d) to the hub (2c).
•
Refit the pulley & hub assembly to the front of the engine.
•
Thread the center bolt (3a) into the nose of the crank. Tighten the center
bolt to 40 lbs /ft.
2a
2b
2c
2e
2f
2d
This kit includes the pieces necessary to mount the fan two different ways. The more
generic “through-the-core” pins can be used to install the fan (Method 1), or the lasercut steel brackets specifically designed for the Triumph may be used (Method 2).
Method 1: Mounting the Fan Using the Through-the-Core Pins (Fig 4)
• Hold fan in desired position on rear face of radiator. Push the mounting pins through
the lugs on the fan and though the core.
•
Push the four foam pads and the ratchet buttons onto the tail of each pin which are
now protruding through the front of the radiator core.
•
Pull the tip of the pin toward you as you push the ratchet buttons home. Pull tight
until the fan is solidly mounted.
With the fan mounted, follow the instructions for fitting the Electronic Fan Controller.
They begin immediately below the instructions for mounting the fan using the laser-cut
brackets on the next page.
3a
Fig 4
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Method 2: Mounting the Fan Using the Laser-Cut Brackets
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REVOTEC ELECTRONIC FAN CONTROL
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This unit is intended for use on Negative Ground vehicles
only. As with all instructions, read through these carefully
before attempting to install the controller on your vehicle.
Page 5 of 9
•
When reinstalling the radiator, leave the top radiator stays off and leave the bottom radiator
mounting bolts loose.
•
Mount the brackets to the fan using the four bolts, washers and nuts supplied in the kit. Note that
the brackets are mounted on the rear of the fan lugs so the fan will be as close to the radiator as
possible.
•
Slide the bottom bracket between the lower radiator mounting points and the chassis mount
points (making sure the fan is on the engine side of the radiator!) and push the fan flat up against
the radiator.
•
Pinch the lower mount bolts to hold the assembly in place.
•
Re-attach the upper stays with the upper fan bracket sandwiched between them and the
radiator.
With the fan mounted, follow the instructions for fitting the Electronic Fan Controller.
5a
5d
5c
INTRODUCTION
This sub-kit contains all of the necessary parts to ensure a
professional quality installation. There are two main parts
which are connected by a wiring harness. The Electronic Fan
Control, or EFC (5a) will be mounted in a coolant hose, and
5b
the harness connects it to the Fan Power Relay (5b), which
will supply the switched 12V feed for the electric fan. The
temperature setting is fully adjustable (5c) to suit the
requirements of your particular vehicle.
Before you begin, ensure that the Revotec controller tube size (5d) is correct for your radiator hose. Note: The
direction of coolant flow through the controller is not important. Failure to use the controller with the relay
included will void the warranty.
Which Hose?
Normally, Revotec suggest installing the EFC in the upper radiator hose. However, in the
Triumph TR2-4 the upper radiator hose is quite short, and the OE type upper hose (6a)
has very pronounced ridges. In addition, the outlet on the engine and the inlet on the
radiator are often not perfectly lined up.
These factors (individually or collectively) make installing the EFC in the upper hose
virtually impossible. The lower hose installation is altogether neater and less obtrusive.
The instructions cover the installation of the EFC in the lower hose based on our
experience with the Moss TR3.
6a
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233
Installing the EFC
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The cooling system was drained as the first step in installing
the fan; unless you have refilled it, you can begin.
• Remove the steel water return pipe.
• Measure 2 ½ inches (65 mm) from the top lip of this
pipe and mark it.
• Cut the pipe on your mark with a hacksaw.
• De-burr the cut edge of the pipe with a suitable file.
• Refit the steel tube (7a).
• Fit the 2 inch long piece of hose supplied in the kit onto
the lower end of the EFC. Secure it with one of the
hose clamps supplied in the kit.
• Attach the EFC (7c) with the short section of hose (7b)
to the shortened steel tube.
• Attach the upper hose (7d) between the EFC and the
water pump housing.
• Tighten all the clamps.
• Top up the coolant and check for leaks.
251
Understanding the Wiring and Electrical Connections
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Before you begin hooking up wires, it will be helpful to understand how this system works.
7
e
7
d
7c
7
b
7
a
8a
4a
8b
8a
8b
8b
4a
8d
4a
8c
8e
FAN
8f
8h
8d
8g
12 V Supply
8j
267
268
269
Electric Fan
Controller (EFC)
8i
4
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The power relay (8a) for the fan comes with the electrical plug (8b) attached, and the plug comes with the
wiring attached at the relay end. The kit comes with a 39” long piece of black wire (8c), and a bag
containing a black plastic plug (8d) and two metal female spade connectors for that plug. The 39” long
piece of black wire is simply the ground for the fan. Suitable ring connectors (8e) are included in the kit so
you can terminate the ground wire. The terminals are not installed so you can trim the wire to the exact
length you need for your installation. The thick blue wire (8f) from the relay is the power wire for the fan.
The thick red wire (8g) supplies 12V to the fan relay when the ignition switch is on. The fan is pre-wired
with a blue (power) and a black (ground) wire that terminate in a plug with two male spade connectors
(8h). The plug is usually marked with a “+” indicating which male spade is attached to the blue power
wire; it is a good idea to identify the blue-wire spade before you connect the fan. The Electric Fan
Controller or EFC (8i) is the “switch” that trips the relay, sending power to the fan when the temperature
reaches the level you set, and cutting the power off when the temperature drops. By powering the fan
through the relay, the control unit is protected from the current that would otherwise flow through it on the
way to the fan. The control unit is grounded to the chassis through a black wire with a ring connector (8j).
284
Installing the Relay, Connecting the Fan
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For safety reasons disconnect the vehicle battery when you are carrying out this installation
procedure. While there are any number of alternate ways of wiring the fan, bear in mind that this is
an engineered package, with components carefully selected to provide the best possible results.
Failure to adhere to the recommended wiring instructions will necessarily void the warranty.
•
•
•
•
•
•
•
•
Choose a position for the relay. Ensure that the wire harness with the relay connector will reach
your chosen position allowing you route the harness with no strain on the wiring. Keep the wiring
away from excessive heat. We mounted the relay to the firewall below the pedal assembly.
Mount the relay (8a) using an existing screw, or drill a hole for a suitably sized self tapping screw.
Connect the black wire (8j) from the control unit harness to the vehicle chassis. If the mounting
screw for the relay is suitable, the ground wire may be secured there.
Connect the RED wire (8g) to a fused and switched 12v power supply. It is recommended that the
feed is from a “switched” (meaning an ignition switch controlled power supply) so that the
controller will not operate when the engine is switched off. If the red wire is connected to an
unswitched supply, the controller will continue to operate after the engine is switched off. The fan
will either stay on after the key is switched off, or come on if the temperature rises above the
temperature set in the controller. This is not unusual as the hot engine will continue to dump heat
into the coolant after shut down. The water will continue to circulate slowly, driven by the
temperature differential. This may drain the vehicle battery if the fan runs for a long time.
Look at the plug attached to the fan motor. (Fig 9) The blue wire is
Fig 9
power, the black is ground. Find the bag with the two female spade
connectors and the plastic plug. This male plug will plug into the
female plug attached to the fan. Connect one of the female spade
terminals to the BLUE wire (8f). Pop the connector into the plastic
plug (8c) so that the BLUE wire from the relay will connect to the
blue wire going to the fan motor. Connect the second female spade
terminal to the length of BLACK wire (8c) supplied loose in the kit.
Pop this connector into the plastic plug (8d) so that the BLACK wire
will connect to the black wire going to the fan motor.
Determine where you will ground the black wire (8c). Trim it to length, strip the end, and crimp on
one of the ring connectors provided. Secure the fan ground wire.
Secure the wiring harness with the cable ties provided.
Reconnect the vehicle battery.
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Adjusting the Controller
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The operating temperature for the fan is adjusted by turning the small screw (10a)
inside the body of the unit. The adjustment screw has a total rotation of just over
3/4 of a turn, which corresponds to a temperature range is 70°C to 120°C (158º F
to 248º F). It increases as you rotate the screw in a clockwise direction. Turn the
adjuster by hand, using a suitably sized flat bladed screwdriver. Do not use
excessive force! You can easily damage the controller.
• Rotate the screw slowly counterclockwise until it stops.
• Start the vehicle and allow the engine to warm up. The fan will come on
10a
when the engine coolant temperature reaches about 70°C (158 º F).
• Verify the fan controller is working properly by slowly rotating the
adjustment screw clockwise until the fan stops.
• Continue to increase the setting until the fan remains off when the engine is at normal running
temperature. The fan will then come on when the engine temperature exceeds normal. When the
temperature recovers, the fan will shut off. Note: This procedure assumes that you have a
functioning and accurate temperature gauge; it won’t hurt to verify your temp readings with an
infrared temperature sensor or a thermometer in the top tank.
• When you have finished with the adjustment and the fan control is operating at the desired
temperature fit the black plastic dust cap into the rectangular opening, covering the controller.
337
PLEASE NOTE
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This fan kit will move enough air to keep a TR2-4 within normal operating temperatures under normal
conditions. The premise of this kit is that you have an engine properly tuned and a cooling system that is
in good working order. An electric fan is being installed because
a) you are installing components (alternator conversion, rack & pinion steering) that require the removal
of the stock crank-mounted fan or
b) the stock engine driven fan is not capable of moving enough air at idle or in stop-and-go traffic
(possibly due to modifications that have boosted the power output).
Fig 10
An electric fan absolutely will not cure a chronic overheating problem due to a mechanical problem,
tuning issue, or other defects. The Revotec fan and controller cannot compensate for fundamental
problems with the engine and/or cooling system.
If you think you may have an overheating problem, please download the article on Overheating Triumphs
and take the time to figure out exactly what is wrong, and fix it or have it fixed. The article is available on
our website www.mossmotors.com. Go to the TR2-4A cooling system web page and open the link. If you
have trouble finding the article, contact Moss Technical Services at (805) 681-3411.
Although every effort has been made to ensure the accuracy and clarity of this information, errors and/or
omissions on our part are almost inevitable. Any suggestions that you may have that will improve the
information (especially detailed installation notes) are welcome. Please use the simple email form on the
“Contact Us” page on the Moss website: http://www.mossmotors.com/AboutMoss/ContactUs.aspx
If you prefer, you may call our Technical Services Department at 805-681-3411. So many people call us for
help that we are often not able to answer the calls as fast as we’d like, and you may be asked to leave a
message. We apologize in advance for the inconvenience. We will get back to you within 2 business days.
Moss Motors, Ltd.
440 Rutherford Street, Goleta, California 93117
In the US & Canada Toll Free (800) 667-7872 FAX (805) 692-2510
(805) 681-3400
Moss Europe Ltd.
Hampton Farm Industrial Estate, Hampton Road West, Hanworth, Middlesex, TW13 6DB
In the UK: 020-8867-2020 FAX: 020-8867-2030
Instruction Sheet 231-710_RFK10
November 2009, Revised October 2010
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Appendix 1: Fan Specifications
AXIAL FANS
12V DC
10"
255mm
SLIM-LINE
PULLER/SUCKER
General CAB Part No:
90050223
Revotec No:
255S53
Static
Pressure
mm H2 O
0
2.5
5
7.5
10
12.5
15
17.5
20
360
361
Airflow
M³/h
cfm /h
1250
1170
1050
930
850
740
620
500
400
738
690
620
549
502
437
366
295
236
PUSHER/BLOWER
General CAB Part No:
90050224
Revotec No:
255B53
Current
Amp.
Static
Pressure
mm H2 O
8.5
8.6
8.8
8.6
8.5
8.5
8.6
8.8
9.1
0
2.5
5
7.5
10
12.5
15
17.5
20
Airflow
M³/h
cfm /h
1220
1110
1070
1020
926
750
694
490
393
720
655
631
602
546
443
409
289
232
Current
Amp.
8.4
8.4
8.3
8.5
8.6
8.8
9.2
9.3
9.5
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