Motor Mounts, How to Check
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Joined: Jul 2022
Posts: 58
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Motor Mounts, How to Check
I am chasing down a few issues I think may be related to my motor mounts. I am having a clunking when shifting into gear (all ujoints are fresh no other issues have been found related to that) and a strong vibration when at idle from the motor movement. I am starting to think these two issues are relates, since every time I accelerate I can feel the clunk as well.
How can I go about checking the two motor mounts? I believe I need to raise/support the engine but I am unable to find any good information on how to DIY on a C4.
Edit: This is for an 87 corvette, L98 engine
Thanks!
How can I go about checking the two motor mounts? I believe I need to raise/support the engine but I am unable to find any good information on how to DIY on a C4.
Edit: This is for an 87 corvette, L98 engine
Thanks!
Last edited by Speedy Saguaro; Aug 14, 2022 at 08:54 PM. Reason: More info
Melting Slicks
Joined: Sep 2010
Posts: 2,422
Likes: 202
That would be a extremely worn out MM. If you hear/ feel a clunk sound putting an automatic in gear. If it was deteriorated that bad. You would see, this engine movement. yourself or an assistant gently power break on / off. I would honestly look at the C-beam. So far a classic symptom. Fairy common front 2 bolts loosen up. The topside nuts are near impossible to touch. a stuby adjustable wrench is a life saver.
Thread Starter
Advanced
Joined: Jul 2022
Posts: 58
Likes: 1
That would be a extremely worn out MM. If you hear/ feel a clunk sound putting an automatic in gear. If it was deteriorated that bad. You would see, this engine movement. yourself or an assistant gently power break on / off. I would honestly look at the C-beam. So far a classic symptom. Fairy common front 2 bolts loosen up. The topside nuts are near impossible to touch. a stuby adjustable wrench is a life saver.
also, are we talking about the two bolts toward the transmission right? When those losen up they could cause some of that clunking nightmare when shifting gears? Sorry for the lot of questions, its just been a nightmare tracking this issue down.
Safety Car
Joined: Jul 2003
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From: Saratoga Springs NY
2024 C4 of the Year Finalist - Modified
2022 C4 of the Year Finalist - Modified
Pop open hood and have someone watch the engine. Put engine at a slightly higher idle (like 1k), and go between drive and reverse with foot on brake obviously. Any excessive movement should be clear...if this can be done on a lift, you could see everything from underneath and pinpoint whats going on.
