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Old 08-28-2002, 04:20 PM
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Post 350 front seal oil leak

I've replaced the front seal on my freshly rebuilt 350 twice and replaced the harmonic balancer with a new one. And it still leaks. Could it be something to do with pressure build up? I have 1 breather and no pcv valve. Thanks Buddy

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Old 08-28-2002, 05:22 PM
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The crankcase must be ventilated or crankcase pressure will lead to blown gaskets/seals (among other maladies).

Are you installing the seal correctly?
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Old 08-28-2002, 07:34 PM
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I agree with KULTULZ. Any ring blow by you have just builds up pressure in your engine and its got to go somewhere. One little breather wont cut it. I think I wouuld go for a PCV setup for the street.
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Old 08-28-2002, 09:16 PM
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If it is an old motor, there is the possiblity that the seal has turned a groove into the shaft. You can buy a over size replacement seal with a sleeve to fix it. I have done this several times.
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Old 08-29-2002, 05:25 AM
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If the balancer is new, there should not be a groove worn into it. Actually though there are two fixes for the grooved seal surface. A sleeve to go over the worn area, or aftermarket seals with the seal lip relocated. But it is extremely important that the seal lip and the seal surface are both well lubricated during assembly. When the engine is first started the heat generated by a dry seal running on a dry surface can wipe it out in just a few minutes. Motor oil works well for lubricating the seal, but I prefer to use engine assembly lube.
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