1958 Cadillac - Engine squealing

[Christian Aicher]

Hi everyone,

My car surprises me every day. Now the engine makes a squealing sound increases in pitch with increased rpm. It only does it when the engine is warm and it only started last year. Before she was running fine.
First I thought the belts are slipping since it just sounds like that and I tightened them, but it did not improve. Next I replaced all the belts - still no improvement. Finally, today after I warmed the engine up, I took the belts off one by one to find the culprit. In the end I had all belts off, including the A/C belt, the PS belt and even the generator belt (which also drives the the water pump) and the engine still squeals. Since the water pump was no engaged, it can be excluded from the suspect list.
The noise seems to come from either the front of the engine or the driver side. The 58 Caddy has an auxiliary vacuum pump built in the oil pump. Could a defect vacuum pump make that squealing sound?

Stumped and very frustrated, open for any advice. 
Chris

[Dave Shepherd]

 :A vacuum leak can cause that type of noise or any gear driven component, the difference in sound can be hard to trace, usually a vacuum leak changes or decreases as the engine is loaded.

[Christian Aicher]

Update: A friend of mine pointed me in the right direction. It is the front crankshaft seal. He told me to squirt some ATF on the crankshaft between the balancer and timing chain cover to get some lubrication to front seal. And would you believe it - the squealing stopped. At least for now.
I guess it is time to change the seal.

Chris