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Mystery pressure leak during boost - solved!
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Posted by MS (more from MS) on Mon, 12 Nov 2001 05:03:33 Share Post by Email
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It had been happening for nearly a month - the sound of air escaping from somewhere whenever I layed on the boost. Despite hoping the cause was simple, all hoses and connections checked fine. One of the components then, perhaps a blown intake manifold gasket, or a cracked turbo compressor. Determined to finally isolate it this weekend I began the "lookaround" inside the engine compartment under bright light. I noticed a very light sheen of oil all over the front of the engine, including the primary gear housing. A likely candidate - the custom turbo oil cooler hoses checked fine, so where..? The red colored post-compressor coupling which connects the curved pipe to the IC was intact. In fact, it was a recently installed new coupling, and I didn't see any oil along it anywhere. I disassembled the unit anyway to get a better look. No tears in the rubber. I also checked all the clamps along the turbo to IC to throttle chamber, and found nothing unusual. So I reassembled everything and went for a test drive. No air leak under full boost! I can only guess that the post-turbo rubber coupling wasn't tight enough. A new coupling, exposed as it is to so much heat, will invariably shrink right where the clamp tightens around it, just enough to allow a hiss of air to escape under boost. Plus any oil which ordinarily accumulates inside the turbo piping.

posted by 32.103.1...


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