DIY: How to replace Strut Mounts (With Bearing)?
Recently my Beat was making a 'Thud' sound when driving though potholes in the highways. As i replaced my lower ball joints,tie rod ends and stabilizer links earlier (at around 30K kms), i am pretty damn sure that the sound was not coming from those parts. The only thing i didn't replaced at that time was the mount bush. So i am sure that the culprit is the Strut Mount Bush. But for a confirmation, i checked it and found that my assumption was correct!
What is a Strut Mount?
Strut Mount a component that attaches the suspension strut to the vehicle.It insulates the tire noise & vibrations from the vehicle. Many (front) strut mounts also contain a bearing or bearing plate that serves as the steering pivot.A strut mount is like a sandwich. One side bolts to the vehicle, the other side to the strut. In the middle is a rubber-like insulating material. So as the vehicle moves and goes over bumps, the up & down impact pushes and pulls at the mount. The mount’s job is to cushion the impacts to reduce the jarring effect, noise and vibration that could transmit into the vehicle.On many front struts, the mount also includes a bearing that the strut attaches to. With one on each side of the vehicle, these bearings act as the steering pivots. The bearing is a critical component that affects steering movement smoothness and response.
Symptoms of a Bad Strut Mount
- Clunking noises
- Vibration
- Loose, stiff or noisy steering
- Tire alignment
- Tire wear
Okay, so that's enough talking; Lets jump into the DIY!
THINGS NEEDED:
Mount Bush Kit
Flat Head Screw Driver
1/2 inch Socket set and its handles (L & T) and extensions
T50 Torx
T40 Torx
Hex Bits set/Allen Key Set
Ring Spanners
Jack
Jack Stands
Thread Locker
Multipurpose Grease
Spring Compressors
WARNING: Before we get started, i need to mention that the coil spring compressor used in this diy is a very dangerous tool. Improper usage of these coil spring compressors may cause serious injury or death. If you don't know how to use a coil spring compressor properly, do not try to do this diy. I am not encouraging newbies to use this dangerous tool. I am just explaining the procedures of how to replace a Strut Mount to prove that these jobs can also be done at home by ourselves
. If you are planing to use this coil spring compressor, use it carefully AT YOUR OWN RISK. I am not responsible for any damage that happens due to the mishandling of this tool. If you don't know how to safely use these compressors, you can take the struts to your FNG and replace the mount bushes from there.
PROCEDURE:
Step 1: Jack up the front of the car and support it on Jack Stands
While jacking up, make sure the floor is strong enough to hold the weight of the car. ( Do not try to jack up the car in a sandy floor)
Step 2: Remove the Wheels
Step 3: Remove the a Caliper mounting bracket bolts and remove the whole caliper assembly
Before removing the bracket bolts,remove the brake hose from its guide by simply pulling it outwards
Remove these two bracket bolts
Bolts removed
Keep the caliper assembly aside without giving stress to the brake hose.
Step 4:Remove the stabilizer link
Use an appropriate hex bit/allen key to hold the ball joint and use a ring spanner to remove the nut
Stabilizer link removed!
Step 5: Remove the bolts holding the strut and knuckle and separate it
Remove the two bolts holding the strut and knuckle
Step 6: Remove Wiper and its complete panel assembly
I am sorry that i forget to take the picture of this process.
The process is quite simple, just remove some nuts,clips and wiper motor wiring harness and you can easily remove wiper and its related panels. By removing this, we get a lot of room to use the tools.
Step 7: Remove the nut holding the strut assembly and remove the complete strut assembly
Use T50 torx bit to hold the strut and use ring spanner to remove the bolt
Bolt removed!
Remove the strut assembly
After Strut removed!
Step 8: Compress the Spring
Strut Assembly!
Insert the jaws of the spring compressor into the springs and tighten the compressor.
Keep in mind that if the jaws of the compressor slips while tightening (Check the above pic), the spring may shoot at you at an EXTREEEME force and that is enough to kill you. So be very careful while doing this. While tightening the compressor tighten both compressors evenly. If you try to compress from one side completely the spring may bend to one side and slip from the jaws of the compressor and thus creating a dangerous scenario. So compress it evenly.
Spring compressed!
Step 9:Replace the mount bush
Remove the nut holding the strut mount. (Do not try to remove the nut without compressing the spring)
Nut removed
Old damaged strut mount
New One!
Old vs New
Check out the height of the bushing material,this gap is creating the 'thud' sound while hitting potholes.
Clean the old grease and dirt and apply fresh new grease
Do not forget to apply grease to the bearing too..
Install the strut mount back and tighten the nut.
Loosen the spring compressor carefully and evenly to avoid casuality.
Step 10: Install the strut back
New strut mount kit comes with new mount plate also
New mount plate.
Tighten the nut.
Step 11: Align the knuckle properly into the strut and tighten the bolts
Before Installing the bolts,clean the threads using a metal wire brush.
Apply a little bit of thread locker to the threads of the bolts to prevent it from loosening up due to vibration
Tighten the bolts.
Step 12: Install the Stabilizer Link
Insert the stabilizer link into the strut and tighten the nut.
Step 13: Install the Wheels
Step 14: Do the same steps to other side also
While replacing strut mounts, always replace them in pairs.
Kudos Job Completed! No more annoying 'Thud Thud'