Grating and Scraping Sounds on Acceleration...

[Anonymous]

When I accelerate and when my tranny is shifting gears, I hear a loud grating sound coming from my engine compartment. I believe I isolated the problem, so I dont really need your help in diagnosis.

I recently rebuilt my engine, and installed it. I have a 1968 with a C4 transmission. After hearing this horrible noise, i quickly returned home and removed the inspection plate, and checked out the clearance of the flywheel bolts, to see if they were hitting the block. The clearance was a little tight, but I saw nothing too wrong. Then I looked at the inspection plate.

The bolts have obviously been scraping along the plate a little at both of the corners. What do I do? Do I need to remove the transmission, or can I simply keep driving it and maybe the torque converter will slide back? (the last suggestion is very optimistic, that is what I want you to tell me, but know that probably won't solve the problem). I'm not too excited about removing the transmission now, but I guess if it has to be done, it has to be done. Just let me know.

Thanks in advance and Happy New Year to you all.

Michael

 

[pedal2themetal45]

HI HAVEA68
HHHMMM I think you might have other probs.
The converter is bolted to the flex plate and shouldn't move in or out?? unless it comming loose from the crank or the flex plate is broke??
I would also check to see if the tranny and the motor mounts are good.. shounds more like the fan hitting the radiator to me..
tim

 

[Anonymous]

No, its definitely not the fan hitting the radiator, there is plenty of room up there. And no gouges/marks in the radiator.

When I replaced my transmission long ago, I remember not getting the torque converter pushed all the way back into the bellhousing. When I bolted it up to the flexplate, it hit the block, and then the main bolts that hold the bellhousing to the engine block wouldn't tighten all the way up since the torque converter was sitting out too far. I dropped the transmission, pushed the converter back further, then bolted it back up with no problems. It was very time consuming, but it ended up working.

Any other ideas?

 

[addo]

Crank end-float excessive?

 

[Anonymous]

Cracked flexplate?

 

[Junk-Falcon]

ppp

 

[Anonymous]

Alright, I guess I'll check that out tomorrow morning. Thanks for all your help.

 

[Anonymous]

Well, nothing was loose, nothing was cracked and nothing was broken.

I'm somewhat stumped. I took the car out this morning, and didn't hear a thing. I have no clue what the noise was before, and now I don't know if it'll come up again. Thanks for your input

 

[Anonymous]

i had a similar sound as what you are talking about but it was intermitent also...I think it ended being the throw out bearing...the bearings were just shot

bvut you have an auto,right?

 

[Anonymous]

Yea, C4 auto. I guess we have a different problem.