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Join Date: Oct 2001
Location: San Carlos, CA US
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996 engine from recycler with high leak down

I am helping a friend with his 996 which blew the IMS and its engine. He bought a used engine from a breaking yard in SoCal. We did a leak down test on it and one cylinder is at 80% leakdown. I am trying to contact the seller to find the history of the engine.

What is the likelihood of the engine sitting around for a long time having a bad leak down getting better after it has been run in a bit?

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Old 08-04-2017, 07:01 AM
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Originally Posted by yelcab1 View Post
I am helping a friend with his 996 which blew the IMS and its engine. He bought a used engine from a breaking yard in SoCal. We did a leak down test on it and one cylinder is at 80% leakdown. I am trying to contact the seller to find the history of the engine.

What is the likelihood of the engine sitting around for a long time having a bad leak down getting better after it has been run in a bit?
Anything is possible... though that's pretty bad. I wouldn't count on it "getting better" especially if you paid a high price for the motor...

Where is the air going? Take off the valve cover, look at the valves... Get a cheap scope and look into the cylinders.
Old 08-04-2017, 07:58 AM
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Air is going out the exhaust ...
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Old 08-04-2017, 08:40 AM
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No way to save this one. Rigged up the engine to do compression test and got zero compression on 6. The engine is going back.
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Old 08-05-2017, 04:50 AM
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That's the problem with a used 996 engine. Before install I'd scope the bores with #5 and 6 getting special attention, remove the sump/filter and inspect, oil analysis, crank push/pull test, 2000- replace the IMS, etc., etc.
Even then it's still a crap shoot.
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Old 08-07-2017, 08:37 AM
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It's a shame they didn't check it. There is so much more to these watercooled motors than just the IMS.
Bruce

Old 08-07-2017, 12:50 PM
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