Bad engine vibration
Thread Starter
Instructor
Joined: Jan 2013
Posts: 212
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I can very faintly feel the vibration with the air off. When i turn the air on it becomes MUCH more obvious. I'll take off the belt tomorrow and see what it does. Its such a pita to get that belt on and off.
Melting Slicks
Joined: May 2014
Posts: 2,894
Likes: 592
From: New Port Richey FL
if your eyes cross when trying to turn the a/c compressor its bad can be big dollars and system will need cleaning along with compressor replacement
Last edited by s carter; Aug 28, 2014 at 09:57 PM.
Melting Slicks
Joined: May 2014
Posts: 2,894
Likes: 592
From: New Port Richey FL
Drifting
Joined: Jul 2014
Posts: 1,426
Likes: 46
From: Lynchburg, VA
I just took off the compressor to replace my water pump and I saw the bracket that holds it on is cracked. The compressor is also missing a bolt. There are a few other threads by people with similar problems and it sounds like that could be the problem, but I'd be interested to know if yours was caused by something different.
Last edited by C4ProjectCar; Sep 12, 2014 at 08:51 PM.
Instructor
Joined: Apr 2013
Posts: 144
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From: NW Arkansas - usually winter in FL
I’m not a vibration expert but let me toss this out for what it’s worth.
We design the a/c compressor brackets to absorb vibration. Absorb is perhaps a misnomer, to not transmit vibrations is a better phrase. All those different bumps, angles and curves, thick spots as well as thin are all there by design. They are “tuned” mounting brackets.
Missing bolts and a crack in the mounting system will not allow the vibrations to be canceled as designed and they will be felt by the occupants.
So, think you might be on the correct path. Fastener tightness is also important.
Jake -
We design the a/c compressor brackets to absorb vibration. Absorb is perhaps a misnomer, to not transmit vibrations is a better phrase. All those different bumps, angles and curves, thick spots as well as thin are all there by design. They are “tuned” mounting brackets.
Missing bolts and a crack in the mounting system will not allow the vibrations to be canceled as designed and they will be felt by the occupants.
So, think you might be on the correct path. Fastener tightness is also important.
Jake -
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Drifting
Joined: Jul 2014
Posts: 1,426
Likes: 46
From: Lynchburg, VA
I’m not a vibration expert but let me toss this out for what it’s worth.
We design the a/c compressor brackets to absorb vibration. Absorb is perhaps a misnomer, to not transmit vibrations is a better phrase. All those different bumps, angles and curves, thick spots as well as thin are all there by design. They are “tuned” mounting brackets.
Missing bolts and a crack in the mounting system will not allow the vibrations to be canceled as designed and they will be felt by the occupants.
So, think you might be on the correct path. Fastener tightness is also important.
Jake -
We design the a/c compressor brackets to absorb vibration. Absorb is perhaps a misnomer, to not transmit vibrations is a better phrase. All those different bumps, angles and curves, thick spots as well as thin are all there by design. They are “tuned” mounting brackets.
Missing bolts and a crack in the mounting system will not allow the vibrations to be canceled as designed and they will be felt by the occupants.
So, think you might be on the correct path. Fastener tightness is also important.
Jake -
The weird thing is that it didn't start vibrating until I took the bracket off and put it back on. And I know I didn't break it when I took it off.
Fastener tightness could also be an issue for me. I just did the bottom compressor bolts to "German specs" (guten tight) because it's impossible to get a torque wrench on them without taking out the wheel well liner, but now that I know that's an issue I'll take off the liner and get them exact.
As far as you know, would epoxying the broken bracket work, or would the difference in the properties of metal and epoxy cause issues?
The bracket on the AIR pump and the alternator was also broken, and I repaired it in this manner.
Drifting
Joined: Sep 2014
Posts: 1,579
Likes: 59
From: Trieste Italy
Hi
My 1995 corvette with manual tranny was afflicted by very bad vibration last days.....
What i've done to resolve it?? I've hammered a little the bolt on shift ****,
Remove plate on shift **** with a flat screw driver than hammer the bolt inside
Let me know
My 1995 corvette with manual tranny was afflicted by very bad vibration last days.....
What i've done to resolve it?? I've hammered a little the bolt on shift ****,
Remove plate on shift **** with a flat screw driver than hammer the bolt inside
Let me know
Drifting
Joined: Jul 2014
Posts: 1,426
Likes: 46
From: Lynchburg, VA
Regardless, I don't think it's the transmission since it happens while I'm stopped with the clutch in.
Thanks for the suggestion.
Drifting
Joined: Sep 2014
Posts: 1,579
Likes: 59
From: Trieste Italy
I'm not sure to what bolt you are referring. I took apart the shifter to replace the shift boots and I only encountered pins and a tiny hex screw.
Regardless, I don't think it's the transmission since it happens while I'm stopped with the clutch in.
Thanks for the suggestion.
Regardless, I don't think it's the transmission since it happens while I'm stopped with the clutch in.
Thanks for the suggestion.
Drifting
Joined: Sep 2014
Posts: 1,579
Likes: 59
From: Trieste Italy
I meant for this oneAttachment 47826862
Drifting
Joined: Jul 2014
Posts: 1,426
Likes: 46
From: Lynchburg, VA