[Old Man]

Just got my 283 running. Have noticed some vibration at higher RPM's. It is a manual transmission car. I just had the flywheel re-surfaced and mounted it.
No other part of the drivetrain is installed yet, so it is strictly engine and
flywheel only. When I mounted the flywheel, I noticed that the crank has a
dowel pin hole between to of the bolt holes. The flywheel has the same dowel
pin hole, but neither have a pin in them. When I mounted the flywheel, I made
sure these dowel holes line up. Was that the correct way to mount it? Give me
some ideas on things I can check to help isolate the vibration. Thanks.

 

[Rick_L]

That's the correct way. Line up the holes but there's no pin unless it was balanced with one. And though the factory provided the pin holes, they didn't use them in any application I ever saw or heard of.

 

[Old Man]

That's the correct way. Line up the holes but there's no pin unless it was balanced with one. And though the factory provided the pin holes, they didn't use them in any application I ever saw or heard of.

Rick, do you think it would help to rotate the dowel pin holes to where the two would be 180 degrees apart or not? I had a reputable machine shop re-surface it, so I do not think
they compromised the balance. Scroggin's Machine in Downtown Houston.

 

[Old Man]

Let me mention something else. I do know for sure that this motor was out of an Automatic trans. car. Would there be a difference in the crankshaft from an auto or a manual?

 

[Branded]

Your 283 should be internally balanced, do you have the correct flywheel. The 400 SB engine where externally balanced and balanced via the flywheel.What did your flywheel come off of.

 

[Old Man]

I bought the flywheel used and it has a casting #3703870 on it. I believe it is the correct one for the 55 V8.

 

[crankshaft]

The 400s all had weights on them. Just look and make sure it is not a weighted flywheel.

 

[techman441]

If you had no vibration before the flywheel was resurfaced,but now it vibrates,the flywheel is the culprit...
I have had to balance a lot of flywheels after they were resurfaced..I think the problem starts with the flywheel being overheated and warping,then when resurfaced the flywheel grinder removes the warp leaving less metal on one side than the other....

 

[Branded]

I bought the flywheel used and it has a casting #3703870 on it. I believe it is the correct one for the 55 V8.

Yes... that should be the correct flywheel used on a 55 V8