I got a loud noise from my bellhousing in a 1966 GTO Manual Transmission. It's a steady tapping that increases with RPM, but doesn't get any louder. After the engine warms up and is idling at low rpm, it seems to go away. But, when I rev the engine, I can still hear it when the engine is idling down.
I pulled the trasmission and the clutch the other week, but I didn't notice any issues. But, running the engine, I was still hearing a slight clanking noise that I traced to a broken spring on my heat riser in the exhaust manifold.
After removing the spring, I didn't notice the noise. But, today I started the car and within a minute, I started hearing the noise again. Once again, when the engine was warmed up and idled down, the noise was gone.
Could this noise be made by the throwout bearing rattling around on the pressure plate springs, or an input shaft going bad on my Muncie transmission?
These are things I've never had to deal with before, so this is all new to me.
Is the pilot bearing OK?
I assume so. But, I'm not sure what to check for in that bearing. I pulled everything out. The pilot bearing just slipped out.
Normally they are a press fit and require a puller to remove. Do you have a factory shop manual for that car? (Definitely a good thing to have for a car that old.)
To cover all bases also make sure the bolts attaching the flywheel to the crank are tight and that the starter ring gear is not separating from the flywheel.
https://www.youtube.com/watch?v=4RRhKU5sik4
https://www.youtube.com/watch?v=j_sgiTa3gew
I have the GM service manual for the car on a PDF, on CD.
When I began pulling things to look for the noise, pulling the trans didn't eliminate it. I pulled the bellhousing and the newish pressure plate and the noise was gone.
Maybe, next week I'll pull the inspection cover and place an endoscope of there.
I assume so. But, I'm not sure what to check for in that bearing. I pulled everything out. The pilot bearing just slipped out. It was clean, and I didn't feel any issues when feeling around it. It slipped right back into the crank with ease. I'm not sure if it is supposed to be a press fit or what. It's supposed to sit inside a race, I assume. There still appeared to be one in the crank.
A.f..a.i.k. the pilot bearing is a -caged needle bearing-, residing in the flywheel with a press-fit.
Did this come out as you took off the gearbox?
Yes. Easily. And slipped back in with ease. It isn't supposed to do that, is it?