Originally Posted by Fuergrissa (Post 3061902)

I recently replaced my throw-out bearing after the factory one had failed which involved removing the drive shaft and dropping the transmission. I replaced the trans oil at the same time.

After the work I am getting a severe vibration when accelerating at low RPM when the engine gets bogged. This is the only time the vibration is present but it is very severe. I know TOB's are a common job, has anyone encountered this before? Not excited to drop the trans again without knowing exactly what I'm looking for. I'm assuming something with the clutch or the DS carrier bearing but really don't know.

Thanks

Originally Posted by EndlessAzure (Post 3061947)

Did you install an aftermarket lighweight flywheel/clutch kit?

Originally Posted by Mr.ac

Chances are something is not torqued down properly.
Could be tranny mounts, drive shaft, who knows. It's one of those things where you just need to put a wrench and feel what's loose.

Originally Posted by humfrz

Welcome to the group, there, Fuergrissa .......... :clap:

So, you didn't have this vibration before you replaced the TOB .. ??

Did you take off the pressure plate and or replace the clutch disk .. ??

Did you do the work or did someone else do the work .. ??

Originally Posted by Fuergrissa (Post 3063049)

No, they were not removed



You are probably right, this was my assumption



No, it wasn't present before. neither pressure plate nor clutch were removed, just pulled the trans off, replaced the TOB and retaining clips, greased the fork pivot (was squeaking), and reinstalled with new trans fluid.

I did the work.

I marked the DS alignment to the differential so it went back on the same way, but the front yoke may have gone into the transmission with a different orientation.

It may be a few weeks before I can put it back in the air and investigate, so I just wondered if anyone had some different ideas. I don't think it's a balance issue because it does not increase in intensity with RPM. and if it were a harmonic resonance it would occur at the same RPM during all operating conditions. The fact that it is only in a certain RPM and only a certain operating condition (under load) makes me think it is probably something mounted too rigidly or not rigidly enough. Checking all the bolts is probably to best way to figure it out, but if anyone has another idea I would love to hear it.

Thanks

Originally Posted by Ultramaroon (Post 3063094)

Do you hear it, feel it, or both?

How did you support the engine?

Originally Posted by EndlessAzure (Post 3063433)

For my part, a little bit of both.

I don't recall supporting the forward part of the engine during the process

Originally Posted by Ultramaroon (Post 3063499)

The engine and transmission together balance on the engine mounts. When separated the engine will flop forward pretty hard. If you didn't support it, the exhaust pipe must have kept things in place. Perhaps a heat shield was bent then? Also, the engine bottom cover can make a hell of a racket if the screws back out. Once they've been removed, it seems like they don't like to stay tight. I use blue loctite on them.

Just a couple ideas. Try to record it for us. It might help.

Originally Posted by ermax (Post 3063826)

Anyways, I feel sorry for anyone who does that job without jacking the front of the engine.