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Old 01-31-2012, 07:10 PM
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Blown 350 Engine Oil Leak

My newly rebuilt 350 chevy has a small Weiand 142 blower. I noticed an oil leak from the rear portion of the intake along the firewall. This is the first time the engine has been started. The mechanic used gasket sealer as is often used on intake manifolds. My question, is there a special sealant that can stand up to the pressure built by the blower? What have other guys used for their intakes to keep them from springing oil leaks? Any help would be greatly appreciated. Thanks.
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Old 02-01-2012, 03:59 AM
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the gasket prbably moved when he put the manifold on that happened to me before putting on a tunnel ram, got it all hooked up fired it up and a slight oil leak in the rear of the manifold, of course it couldnt be the front gasket. always the rear on
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Old 02-01-2012, 06:35 AM
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Quote:
Originally Posted by trifivefan
My newly rebuilt 350 chevy has a small Weiand 142 blower. I noticed an oil leak from the rear portion of the intake along the firewall. This is the first time the engine has been started. The mechanic used gasket sealer as is often used on intake manifolds. My question, is there a special sealant that can stand up to the pressure built by the blower? What have other guys used for their intakes to keep them from springing oil leaks? Any help would be greatly appreciated. Thanks.
The blower makes no difference. If you have blower pressure in the crank case you have bigger issues.

I normally use 1/4 bead of black RTV or "the right stuff" if I can get some. You said he used gasket sealer. Did he use the gaskets and sealer or just sealer. The gaskets are problematic and most people dont use them. You may also want to make sure it is not the oil pressure switch leaking as it is in the same area
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Old 02-01-2012, 09:46 AM
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Thanks Wayne and Chet. He used gaskets for the upper or sides of the intake and sealant along the front and rear of the intake. I also thought it might be the oil pressure tube but removed it and tefloned it. Are you both thinking that sealer is better than a gasket along the front and rear sides of the intake? To relieve crankcase pressure I installed an extra breather on one side of the valve covers. Would it help to install another one on the other valve cover or would this screw up the system where one side take in air and the other helps it escape?
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Old 02-01-2012, 11:09 AM
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Originally Posted by trifivefan
Thanks Wayne and Chet. He used gaskets for the upper or sides of the intake and sealant along the front and rear of the intake. I also thought it might be the oil pressure tube but removed it and tefloned it. Are you both thinking that sealer is better than a gasket along the front and rear sides of the intake? To relieve crankcase pressure I installed an extra breather on one side of the valve covers. Would it help to install another one on the other valve cover or would this screw up the system where one side take in air and the other helps it escape?
You should have a PCV if you don't. The front and back seals should be RTV or similar, the intake to head always uses a gasket. Poor crank case ventilation can cause leaks as well if the crankcase pressure is to high.
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Old 02-01-2012, 03:11 PM
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Thanks, Chet
I do have a PCV valve on one side and two breathers on the other valve cover. I am also using gaskets on the high sides of the intake and RTV sealant on the front and back. I was told that there is no pressure on the back side of the intake so no reason for it to leak there. That it is more likely to have leaks at the oil pressure switch and distributor since they are under pressure. However, it looks to me that the oil is coming from the rear of the intake and along the sealed portion. I plan to put a temporary plug where the oil sender screws in to the block and see if the leak is coming from the intake or distributor, although the distributor would have oil on the intake if it were leaking and I can feel any or see any. Any other suggestions for trying to narrow down the leak?
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Old 02-01-2012, 03:56 PM
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Quote:
Originally Posted by trifivefan
Thanks, Chet
I do have a PCV valve on one side and two breathers on the other valve cover. I am also using gaskets on the high sides of the intake and RTV sealant on the front and back. I was told that there is no pressure on the back side of the intake so no reason for it to leak there. That it is more likely to have leaks at the oil pressure switch and distributor since they are under pressure. However, it looks to me that the oil is coming from the rear of the intake and along the sealed portion. I plan to put a temporary plug where the oil sender screws in to the block and see if the leak is coming from the intake or distributor, although the distributor would have oil on the intake if it were leaking and I can feel any or see any. Any other suggestions for trying to narrow down the leak?
It possible the bead of RTV just was not thick enough. Generally a little extra in the corners doesnt hurt.
You may also damaged the bead of sealer if you didnt drop it on exactly right and had to move it.
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