Replaced Motor Mounts huge vibration in neutral

ShallowGrave

Founding Member

Sep 30, 2001

371

0

16

Philadelphia

Jun 3, 2010

#1

• Jun 3, 2010

• #1

Replaced Motor Mounts huge vibration in neutral...FLYWHEEL?

Ok. Got the old stang out of storage and drove it home with no vibration. I replaced the motor mounts, started it up, and with the clutch pushed in the thing vibrates like crazy as I rev the engine, but doesn't vibrate with the clutch out, car in neutral and engine rev. It doesn't feel like its coming from the engine. I'm afraid to take it for a test drive. Any thoughts?

 

Y

y0ukantride

New Member

Apr 15, 2010

36

0

0

Indianapolis

Jun 3, 2010

#2

• Jun 3, 2010

• #2

What mounts did you get? When i did mine my long tube headers touched the k-member a lil maybe check there.

 

raven_ghostwolf

15 Year Member

Nov 26, 2007

55

2

8

Eloy, AZ.

Jun 4, 2010

#3

• Jun 4, 2010

• #3

Sounds like something I went through once with my 87, have you checked the condition of your harmonic balancer?

 

ShallowGrave

Founding Member

Sep 30, 2001

371

0

16

Philadelphia

Jun 27, 2011

#4

• Jun 27, 2011

• #4

How would I check the balancer?

Some background...When I built this car I put the tranny Xmember in backwards and drove it that way for years. (i could only ever get one bolt in and needed a pry bar to get it, but didn't put 2 and 2 together until I did my motor mounts). Now that the Xmember is in correctly, I have a vibration, and am assuming the flywheel, or clutch is worn at a bit of an angle since the tranny was slightly off center before.

Is that possible? I prob don't need a clutch or flywheel otherwise, and hate to rip it apart if there isn't a chance in hell that it is the problem.

 

J

jka

5 Year Member

Jan 17, 2010

339

23

29

Jun 27, 2011

#5

• Jun 27, 2011

• #5

Sounds like your harmonic balancer.... drive your car up on ramps and with the engine running look at the balancer and check and see if it's turns smooth without any shake or wobble... and look under the car with a flash light and see how the balancer turns with the engine running.

 

Kdubslugga

Active Member

Jun 7, 2003

1,515

3

38

Akron, OH

Jun 28, 2011

#6

• Jun 28, 2011

• #6

If you can, and if your balancer is stock, you should see like a rubber ring around the perimeter of the the balancer, if severely cracked, or several chuncks are missing, this is usually a sign of a bad balancer

 

ShallowGrave

Founding Member

Sep 30, 2001

371

0

16

Philadelphia

Jul 10, 2011

#7

• Jul 10, 2011

• #7

Balancer Rubber was severely cracked, so I replaced it, and yes, I still have the vibration. It is definately coming from the transmission or clutch/flywheel.

 

Beasty306GT

Active Member

Dec 19, 2002

671

4

28

Oxford,Mass

Jul 10, 2011

#8

• Jul 10, 2011

• #8

did u use solid mounts

 

ShallowGrave

Founding Member

Sep 30, 2001

371

0

16

Philadelphia

Jul 10, 2011

#9

• Jul 10, 2011

• #9

No. Not solid.

 

Rick 91GT

Mustang Master

Nov 29, 1999

9,692

95

99

PA

Jul 11, 2011

#10

• Jul 11, 2011

• #10

How did the transmission crossmember mounts look? What about the trans mount itself?

Id look for something rubbing, air pump pipe, etc...

 

ShallowGrave

Founding Member

Sep 30, 2001

371

0

16

Philadelphia

Jul 11, 2011

#11

• Jul 11, 2011

• #11

Trans mount was redone with the motor mounts. I'm starting to think the pilot bearing is trashed. Gonna pull the tranny when I get back from my 3,600 mile roadtrip (I'll unfortuntely need to do it in my other car, which makes it nowhere near as fun).

 

ShallowGrave

Founding Member

Sep 30, 2001

371

0

16

Philadelphia

Aug 20, 2011

#12

• Aug 20, 2011

• #12

Pilot bearing completely destroyed as suspected. Now If I could just get the outer sleeve out.