Sunday, 9 October 2011

Avanza: DIY Repair Transmission Mounting

A recent change of transmission fluid has led me to inspect the transmission mounting while I crawled under the car, and I’m suspecting it has cracked.

I also noticed an occasion knocking sound from the central cabin tunnel when going through bumps.

So I came across this epoxy adhesive which is perfect for the job.Smile

It has 3 types, 4min, 5min and 90min and each can withstand 3 tons, 3.5 tons and 4 tons respectively. I think 90 min is too long, hence I picked the 5 min variant. The entire car doesn’t even weight 3 tons.. Smile with tongue out


Going under the car again and yes, the black clean line is created due to rubbing, meaning there are movement between the top plate and the 2 rubber support blocks, which shouldn’t happen unless the section has cracked or broken.


This following photo is taken from the rear, notice the same black crack lines between the V-shape top plate and the 2 rubber blocks? Oh! That’s my pet taking her nap in the back ground.. Smile


Found a jack point, it’s at the flywheel housing, at the joint where the transmission is connected.


After jacking the transmission up, the gap between the top plate and the 2 rubber blocks are clear!! Surprised smile


Since the gap is not wide enough for me to apply the epoxy adhesive, I had to remove the mounting. 2 size 14mm bolts at the top and 2 size 14mm nuts at the bottom, to be accessed through the bottom cross beam. Look at the following picture after ripping off the 2 sections.. Surprised smile The 2 sections are supposed to be moulded together.


Here goes nothing.. mix the epoxy with the hardener.. the mix is actually hot, an increase in temperature due to the chemical reaction.


I only apply one side, the top plate. Then slide the top plate over the rubber blocks.. I need to act swift because I only have 5 min before the epoxy harden even though it takes hours to fully cure.


Installing the transmission mounting back to it’s original location.. Hint: Put in the top bolts first before tightening the bottom nuts because the top bolts do not have free play while the bottom has.


Slowly lower the jack..

Hint: I lay some old newspaper under the jack to distribute the weight because I worry I might crack my tiles.


Viola! Smile


I think the past 7 years, 160k km of flying over speed bumps and uneven road have finally taken a toll on the transmission mounting.. but fear not, after tonight, flying continues.. !!! Smile with tongue out

Thank you for reading. Comments are welcome! Winking smile


  1. shared your post in FB. Good info bro!

  2. Congratulations! This is the great things. Thanks to giving the time to share such a nice information.
    Transmission Repair Denver

  3. Did the epoxy you used for the transmission mounting last? Did it really work in repairing the crack in the transmission mounting? I also have the same problem with my car’s transmission. An auto repair shop is a bit far in our area, so I’m looking for a quick fix. ->Jae Gunderson

    1. Jae, nope.. it didn't last.. the rubber has aged and turn powdery.. go get a replacement mounting and change it, which I did.