Squealing near torque converter on Chevy Truck

GIIUFH

MEMBER
1995 CHEVROLET TRUCK
222,222 MILES

My 1995 Chevy K1500 has a loud squeal from by the torque converter once it warms up. While squeling, if I pull the oil fill cap, vacuum is released and squealing stops. Put the cap back on, it builds vacuum and squeals again. Replaced PCV valves, no change. Any suggestions greatly appreciated.

5 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

How much pressure is coming out the valve cover? Excessive crankcase pressure comes from blow by from the piston rings

Roy

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Thursday, October 13th, 2011 AT 7:59 PM

GIIUFH

MEMBER
3 POSTS

Dont have a way to measure. It is not pressure but excessive vacuum. Motor only has about 40,000 miles on it. Was a crate engine from GM. Runs great just squeals loudly. Seen this same question numerous times on internet but no answers. Thanks

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Friday, October 14th, 2011 AT 2:23 PM

ASEMASTER6371

MECHANIC
52,797 POSTS

Without us seeing it and hearing it, it is very difficult. If you say the noise stops when you take off the oil fill cap. And you say it is a vacuum, you may have a bad intake manifild gasket creating excessive vacuum into the crank case and you hear it from the rear main.

Roy

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Friday, October 14th, 2011 AT 2:41 PM

GIIUFH