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Removal and Installation of Fuel, Coolant and Engine Temperature Gauges
 
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Pelican Technical Article:

Removal and Installation of Fuel, Coolant and Engine Temperature Gauges

Time:

2 hours2 hrs

Tab:

$200 to $900

Talent:

**

Tools:

10mm Allen socket breaker bar, 6inch socket extension, 2ft long/1inch diameter pipe, flathead screwdriver, Phillips head screwdriver, 6mm socket, 7mm socket

Applicable Models:

Mercedes-Benz 450SL (1973-80)

Parts Required:

Fuel, coolant, and temperature gauges

Hot Tip:

Disconnect battery

Performance Gain:

Working fuel, coolant, and temperature gauges

Complementary Modification:

Replace the steering wheel

There are several possible reasons why the gauges are not working. After you have established that the sensors and level indicators are working it could be the gauge itself. While it is possible to change each gauge, finding the replacement maybe a challenge. It s recommended that the unit be replaced. In order to replace the tachometer, the instrument cluster has to be removed. Removing the unit, requires removing the steering wheel. This is a simple task if you use a breaker bar and a steel pipe to counter-act the force needed to loosen the 10mm Allen screw holding the wheel in place. It is estimated that there is greater than 65ft-lbs holding the steering wheel in place. Without the leverage of a breaker bar and a pipe to counter-act the force you will have to use to loosen the screw, you will not be able to loosen it using conventional means.

Before you do any work on your car it is important that you wear safety glasses, work gloves and dispose of all fluids in a safe manner. Protect your eyes, hands and body from dust, debris as well as sharp objects and edges while working on your vehicle. Disconnect the battery before beginning work. Never work on your vehicle if you feel the task is beyond your ability.

Before the steering wheel can be removed, the sheering wheel pad must be removed.
Figure 1

Before the steering wheel can be removed, the sheering wheel pad must be removed. To do this, simply lift the pad off the clips holding it in place.

An alternative method to remove the steering wheel without removing the pad involved is the removal of the emblem in the center in order to access the Allen screw.
Figure 2

An alternative method to remove the steering wheel without removing the pad involved is the removal of the emblem in the center in order to access the Allen screw. If you do not want to remove the pad, you can loosen the Allen screw. You will need to have someone holding the steering wheel in place as you attempt to loosen the Allen screw. Removing the emblem is easy and done so by lifting it off with a flat face screwdriver. 

Once the pad is liberated from the wheel, simply lift it off the clips.
Figure 3

Once the pad is liberated from the wheel, simply lift it off the clips.

Once the pad is removed you will have access to the lead for the horn switch.
Figure 4

Once the pad is removed you will have access to the lead for the horn switch. Disconnect the lead from the wheel.

Slide the pipe through the steering wheel as pictured.
Figure 5

Slide the pipe through the steering wheel as pictured. This will help to provide leverage when loosening the Allen screw, using a 10mm Allen wrench with a six-inch extension on the breaker bar. If you line up the breaker bar with the pipe, simply force the breaker bar down as you pull the pipe up. Using equal force will allow you to loosen the screw without turning the wheel. After the screw is removed the steering wheel can then be removed. 

Once the steering wheel is removed, the instrument cluster can be removed by lifting the top edge.
Figure 6

Once the steering wheel is removed, the instrument cluster can be removed by lifting the top edge.

Once the top edge is lifted up, pull the instrument cluster forward.
Figure 7

Once the top edge is lifted up, pull the instrument cluster forward. There will be several cables attached to the instrument cluster.

The speedometer cable is attached to the instrument cluster with a cable screw.
Figure 8

The speedometer cable is attached to the instrument cluster with a cable screw. Unscrew the cable from the back of the instrument cluster.

The back of the instrument cluster has a few other cables that are various indicator lights and fluid level indicators.
Figure 9

The back of the instrument cluster has a few other cables that are various indicator lights and fluid level indicators.  

Disconnect the tachometer lead.
Figure 10

Disconnect the tachometer lead.

Disconnect the sensor indicator.
Figure 11

Disconnect the sensor indicator.

There is a plastic part that has to be installed prior to fitting the instrument cluster.
Figure 12

There is a plastic part that has to be installed prior to fitting the instrument cluster.

After the Instrument panel has been removed, flip it over and expose the back.
Figure 13

After the Instrument panel has been removed, flip it over and expose the back.

Using a 6mm socket, remove the screws holding the tachometer to the back.
Figure 14

Using a 6mm socket, remove the screws holding the tachometer to the back. You will need to remove the tachometer / clock unit to remove the gauges.

There will be several screws that will have to be removed.
Figure 15

There will be several screws that will have to be removed. Make sure you do not lose any. They are difficult to replace.

A plastic harness holds on the instrument cluster wires.
Figure 16

A plastic harness holds on the instrument cluster wires. Take care in removing the plastic harness from the housing.

The light dimmer switch can now be removed.
Figure 17

The light dimmer switch can now be removed. It has to be removed in order to free the wires.

The lamp can also be removed as well.
Figure 18

The lamp can also be removed as well. This will free the panel.

Using a 6mm socket, continue to remove the screws.
Figure 19

Using a 6mm socket, continue to remove the screws.

There is a 7mm screw that holds the unit in place.
Figure 20

There is a 7mm screw that holds the unit in place. Using a 7mm socket remove the screw.

The unit is held on with 6mm screws.
Figure 21

The unit is held on with 6mm screws. Using a 6mm socket remove the screws.

There is one screw that will require a 7mm socket.
Figure 22

There is one screw that will require a 7mm socket. Using a 7mm socket, remove the screw and keep it in a safe place.

The Fuel, Coolant, and Temperature gauge is now free to be replaced.
Figure 23

The Fuel, Coolant, and Temperature gauge is now free to be replaced. Installation is the reversal of removal.

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Page last updated: Fri 12/9/2016 03:05:03 AM