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Vibration after replacing motor mounts?

Tiny
BW74
  • MEMBER
  • 2003 MITSUBISHI GALANT
  • 2.4L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 190,000 MILES
The car ran fairly smoothly before. Two of the motor mounts were worn out so I decided to replace all four. After everything was put back together, I started the car, and it had a slight vibration in park, but an insane vibration felt through steering wheel and dashboard and door when in drive with foot on brake. Does it in reverse also with foot on brake but not as bad.
Car seems to sound louder as well.
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Sunday, November 13th, 2022 AT 7:04 PM

10 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,967 POSTS
Are the engine mounts OEM? If not, then aftermarket engine mounts can be made of harder material which will cause the vibration of the engine to come through to the frame of the car. Also, you might want to reposition the mounts to make sure the engine is not in a bind which can cause a vibration as well. Also, there is a specific way the engine mounts must be installed here are the instructions in the diagrams below. Check out the images (below). Let us know what happens and please upload pictures or videos of the problem.
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Monday, November 14th, 2022 AT 9:25 AM
Tiny
BW74
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They're possibly aftermarket. When ordering them I had a hard time finding OEM. I also have no dynamic damper on the motor mount like is illustrated. Not one on the old Mount or the new. Is there a certain sequence you are supposed to tighten motor mounts? I have even tried to loosen the front through bolt and the back motor mount through bolt and put the car in gear back and forth a few times to try to center them better but that didn't help at all. The vibration is crazy.
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Monday, November 14th, 2022 AT 10:09 AM
Tiny
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Is there a sequence to tightening all the motor mounts?
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Monday, November 14th, 2022 AT 6:26 PM
Tiny
KEN L
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Not really, you can try loosening all of them and the engine and transmission will seek their own equilibrium then tighten them down. If the vibration was not there before the engine mount, I think the mount would be the problem. Also, can you check to make sure the bolts are in the correct locations because if a bolt is too long it can contact the frame or engine and negate the mounts' purpose.
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Wednesday, November 16th, 2022 AT 1:25 PM
Tiny
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Okay. Do I need to loosen just the through bolts or loosen those and the bolts holding the mount to the chassis?
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Wednesday, November 16th, 2022 AT 2:01 PM
Tiny
KEN L
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Yep, loosen all mounting bolts and nuts, support the engine/transaxle with a jack to help it move the way it needs to.
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Thursday, November 17th, 2022 AT 4:56 PM
Tiny
BW74
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I didn't really notice before removal, but the transmission mount is leaning towards the firewall a bit. Also, if I loosen all of them which one do I tighten first? Thank you
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Thursday, November 17th, 2022 AT 5:17 PM
Tiny
KEN L
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It should not matter which one you tighten first, but the transmission mount cannot be touching metal to metal.
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Friday, November 18th, 2022 AT 1:25 PM
Tiny
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Last question. What is the torque specs for all the motor mounts?
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Saturday, November 19th, 2022 AT 5:29 PM
Tiny
KEN L
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Here you go, the torque specs are in the images below. Please let us know if you need anything else to get the problem fixed.
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Sunday, November 20th, 2022 AT 12:23 PM

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