Vibration question?
Thread Starter
Racer
Joined: Oct 2002
Posts: 393
Likes: 0
From: texas city texas
Vibration question?
This is on the mustang. Four speed tranny. At high speeds, and even low speeds but higher rpm's I start to get a heavy vibration. It is not in the suspension and I don't think the engine. It seems to start right under me. I'm thinking pressure plate throwout bearing area. The clutchfork seems very loose when I get under the car and check. Any thoughts? Thanks. :cheers: PS. The problem just started recently and got alot worse quick.
Melting Slicks
Joined: Sep 2001
Posts: 2,218
Likes: 0
From: Glendale AZ
Re: Vibration question? (mp77)
im not that familer with the ponys, but I would ask. " what action do I do that will make the vibration increase or decrease?"
for example: The car vibrates while not in gear, and the vibration pulses increase with engine rpm. = the problem is flywheel and/or upstream of the flywheel.
From your post I would clarify, that you get the vibration in ANY gear irrelevent of vehicle speed, and only at high engine RPM?
IF the vibration is not there with the same rpm while NOT in a gear, then logic dictates it is located in the bell housing area.
just my 2 cts
cheers
spock
for example: The car vibrates while not in gear, and the vibration pulses increase with engine rpm. = the problem is flywheel and/or upstream of the flywheel.
From your post I would clarify, that you get the vibration in ANY gear irrelevent of vehicle speed, and only at high engine RPM?
IF the vibration is not there with the same rpm while NOT in a gear, then logic dictates it is located in the bell housing area.
just my 2 cts
cheers
spock
Thread Starter
Racer
Joined: Oct 2002
Posts: 393
Likes: 0
From: texas city texas
Re: Vibration question? (71'AirStrike)
im not that familer with the ponys, but I would ask. " what action do I do that will make the vibration increase or decrease?"
for example: The car vibrates while not in gear, and the vibration pulses increase with engine rpm. = the problem is flywheel and/or upstream of the flywheel.
From your post I would clarify, that you get the vibration in ANY gear irrelevent of vehicle speed, and only at high engine RPM?
IF the vibration is not there with the same rpm while NOT in a gear, then logic dictates it is located in the bell housing area.
just my 2 cts
cheers
spock
for example: The car vibrates while not in gear, and the vibration pulses increase with engine rpm. = the problem is flywheel and/or upstream of the flywheel.
From your post I would clarify, that you get the vibration in ANY gear irrelevent of vehicle speed, and only at high engine RPM?
IF the vibration is not there with the same rpm while NOT in a gear, then logic dictates it is located in the bell housing area.
just my 2 cts
cheers
spock
Melting Slicks
Joined: Sep 2001
Posts: 2,218
Likes: 0
From: Glendale AZ
Re: Vibration question? (mp77)
process of elemination: with your senaro, if the vibration pulses are not affected by the vehicle (i use the term "vehicle" loosley, being a ford an all :D ) speed itself, then it would be in the bell housing area.
Now you have to narrow it down to Flywheel, clutch,pressure plate, T/O bering, ect. ect.
My sence of logic tells me that it is is the flywheel. And when the clutch/ transmition is engaged the flywheel vibration will transmit throughout the rest of the drive train. Since the tranny is closer to the "vribration sencer" (you butt :) ) that is why the pulses are more pronounced while in a gear.
good luck
cheers
cahd
Now you have to narrow it down to Flywheel, clutch,pressure plate, T/O bering, ect. ect.
My sence of logic tells me that it is is the flywheel. And when the clutch/ transmition is engaged the flywheel vibration will transmit throughout the rest of the drive train. Since the tranny is closer to the "vribration sencer" (you butt :) ) that is why the pulses are more pronounced while in a gear.
good luck
cheers
cahd
Le Mans Master
Joined: Jun 2002
Posts: 8,339
Likes: 24
From: I can walk to MA
Re: Vibration question? (mp77)
I wouldn't suspect the throwout bearing or the clutch disc, unless
pieces of it have broken away. Ditto for the pressure plate. Besides, these
two would have made vibrations at the engine, too.
I was thinking a worn or broken input bearing to the tranny - letting
the clutch plate go off center - but that would also vibrate the engine.
Anything inside the gearbox that would be that off-balance would have
made some scary sounds, too.
I'm thinking - with 55% probability that it's a Ujoint - probably the front one.
Sometimes the Ujoints behave themselves, until enough torque is applied.
:seeya
[Modified by Daves_rusty_75, 11:36 AM 11/19/2002]
pieces of it have broken away. Ditto for the pressure plate. Besides, these
two would have made vibrations at the engine, too.
I was thinking a worn or broken input bearing to the tranny - letting
the clutch plate go off center - but that would also vibrate the engine.
Anything inside the gearbox that would be that off-balance would have
made some scary sounds, too.
I'm thinking - with 55% probability that it's a Ujoint - probably the front one.
Sometimes the Ujoints behave themselves, until enough torque is applied.
:seeya
[Modified by Daves_rusty_75, 11:36 AM 11/19/2002]
