Mercedes W123 Motor Mount Replacement - IFixit Repair Guide

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Mercedes W123 Motor Mount Replacement

Introduction

The motors on W123 cars are supported in the front by a pair of rubber motor mounts. The mounts attach the motor to the frame of the car while buffering the motor to prevent excess vibration from being felt by the driver.

When these mounts begin to compress and soften, with age and with deterioration from exposure to fluid leaks, increased vibration will be felt in the car. In addition, the motor will ride lower in the engine compartment and, in time, will lower to the point where the accessory belts may rub against critical parts like the oil cooler lines. This can lead to a leak in the line, loss of oil, and eventually catastrophic engine failure.

So as you can see, the mounts play a critical role in the operation of a W123. Replace your worn mounts early, before trouble starts.

What you need

1. Step 1 Motor Mount

   

   • To remove your motor mounts you will need to raise, and support, your engine with a bottle jack.

   • Before you can do this you will need to remove the bolts that hold the engine to the mounts. This is done from below the car.

   • The bolts are allen head bolts; you will need an 8mm allen head socket. It should be a 1/2 inch drive socket as you will want a large wrench for leverage. These are often in very tightly.

   • The bolt on each mount is located up inside a recessed area as shown.

   • Remove the bolt and set it aside.

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