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C900 Bulletin Board
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Re: Need help with new oil leak. 1991 2.1 16v
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Posted by gorper (more from gorper) on Mon, 7 Jun 2004 09:26:06 Share Post by Email
In Reply to: Need help with new oil leak. 1991 2.1 16v, John G, Sun, 6 Jun 2004 21:07:19
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I'm confused. If the rear main seal were leaking (this is the crank seal behind the flywheel at the *front* of the engine bay, not the rear), I don't think you'd see oil flung about because this area is enclosed beneath the clutch cover. Further, a leak from the crank seal would be at fairly low pressure and is more likely to simply drip down and out the bottom of the engine bay. Another source for leaks at the clutch area is the endplate; again, this would be a low pressure leak.

Are you perhaps talking about oil being slung up at the firewall side of the motor? If so, then your front crank seal could be leaking onto the belts, which are throwing the oil around. This isn't good for the belts but, worse, it's hard on the crank pulley. When the oil deteriorates the rubber in the pulley, it shimmies, and can rub against the oil pump cover, which wears a hole in a small bulge, beneath which high pressure oil flows. Consequently, your engine's oil supply is forcefully dispersed to the pavement in very short order.

WRT to the crankcase breather, there is a small, grey/white inline valve at the valve cover. Carefully remove it (it'll be fragile from exposure to heat), clean it up a bit w/some brake or carb cleaner, then blow on the side to the valve cover (air passes)/suck (no air passes) to ensure the valve is still good. Be sure to reinstall it properly oriented.

Later cars such as yours do not lose vacuum when the dipstick is removed...

posted by 65.101.15...

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