Ok, so I got my street port put in the roller and all done, but when I fire her up and tune my weber, she starts making a strange "whirring/chirping" type sound. After a few phone calss, I pulled out my stethoscope, and the sound is only clear when I place the tip on the top inspection plate. I can only hear it there and less clear on the side inspection plate. Not the carb, housings, irons, alt, water pump. So, I'm assuming this is coming from the tranny/motor bellhousing area. Any ideas? Is it safe to drive? I need this as my DD, but have no desire to toast something on the very first road trip. BTW, noise comes and goes at times, but is not affected by depressing the clutch. Other than the noise she seems to be running great.

Oh, it's an 84 gs w/5 speed, 12a, holley red pump and fpr, weber sidedraft, no emissions, RB header and 3" pipes to a Magnaflow.

 

Take the top inspection plate off and listen again. Also try pulling the starter to see if there is any contact of flywheel to starter snout.

The gasket isn't making the noise?

 

I'll pull the plate, then the starter. Wasn't the gasket though. I put the steth all over the carb and intake. I could hear the damn thing breathe, but no noises. I could only get the noise at the inspection plates, mostly the top one. Not at the rear housing, or anywhere else I looked and I listened to everything. LOL BTW- rotors sound kinda cool through it too. LOL

 

Listen farther back near where the tranny input shaft bearing is. You did refill the tranny, right?

 

Tranny was still in the car when I bought it. But no, I didn't even think to check the tranny fluid. I'll do that first. And I'll listen further back on the tranny for the noise too.

 

Tranny fluid level is good and fluid looks new. Pulled the top inspection plate and the noise gets much louder. used a flashlight too look in at the motor side of the flywheel, no scraping obvious or showing on the motor side. Pulled the starter, it's not rubbing either, no shiny or wear spots I can see from there either, except the flywheel teeth but starter is grinding a bit anyway. So thats probably the reason for the teeth.Listened around for the noise, but it's still loudest from the top inspection plate. loosened the slave bolts and started her up again, but still there. At this point I'm assuming it's the throwout bearing, though I've never heard one make a noise like this. If it's not that, I'm out of ideas.

 

when you replaced the engine, did you inspect or replace the pilot bearing and the throwout bearing?

 

Does it vary when you load up the clutch pedal? If yes, I'd think throwout bearing.

The fork and the bearing tabs may not be engaging quite tightly enough, letting the unloaded bearing bounce back and forth.

Did you grease the shaft cover where the bearing slides, and the engagement spots for the fork?

 

When I bought the car, I had four motors and 2 trannys I'd just picked up in the back of the tahoe. LOL The tranny was already in the car, so I towed it to ArmyofOne's house, and he helped me put his motor in there at night as it wouldn't fit in the truck and I don't have a hoist or flat ground here. But no, I didn't grease it, and a nightime visual is the only inspection it got. The car was used as a track car by the guy I bought it from and he said it was good. I took him at his word, as I had few alternatives at that time, and it was dark before I got to Jesus' house to get the motor. When I depress the clutch and rev the motor, it does seem to temporarilly go away, then as motor revs down, it returns, clutch or no.

 

That does sound a bit like a failing throwout bearing. I can bring a used one to Taco7 if you want one. They go for $35 at Mazdatrix.

One thing I'd like you to do before you install it is to compare to the NOS one I stuck on the other tranny. The inside where it contacts the slider hub is a little different. Choose which ever one you feel will work better. I personally like to trust a good used part over an untested new part most of the time.

 

I had to replace my shaft cover (slider) once a long time back; after a couple decades of LA stop and go, the aluminum had worn down a bit & it didn't like to sit still.

Didn't sound a lot like that, though; more of a straight rattle noise with the clutch pedal released.

 

This is a metalic whirring or chirping type sound. It isn't there at startup, then after a minute or so it suddenly starts and mostly stays. periodically lessens and comes back. Makes a nasty metalic rubbing sound when you shut it off while it's "singing" too. My exhaust is too loud to hear if it's doing it while driving, but I still hear it when I drop down to idle.

 

running into the same problem. Had to unexpectedly leave for work, so the car sat for about 2 months. Now I get this deafening noise from the bell housing. It is a super high pitched whirring noise.

Did you ever sort out what the problem was so I can head in that direction?
Thanks

 

It does not vary with clutch in or out, and moving it from the garage to the driveway. Doesn't differ in RPM's either, just goes faster and more high pitched.

 

Might also be the pilot bearing, did you lube it before mating the engine and tranny? When the pilot bearing finally fails, it sounds like sand being ground up.

 

bad pilot bearing will also make it hard to shift gears. and u can forget getting reverse without shutting it off first. it tends to grip the input shaft and keep turning it with the clutch in.

 

Not having any problems shifting. Had my motor ported and rebuilt about 5 years ago. Nothing done with the tranny as far as I know.

 

may be an input shaft bearing. the release bearing(at least mine did) would make a noise once u put pressure against it, like resting ur foot on the pedal, and really screech when pushing the pedal in to shift. it finally got so bad trying to get it home that if u kept the pedal down it would start to stall the engine. i finally had to finish the drive home without using the clutch.