Is hissing noise normal for leak down test?
08-06-2002, 03:16 AM
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Racer
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Is hissing noise normal for leak down test?
Hello,
I just did a leak down test for my '86 951 to check for bent valves and I heard some hissing/whistling noise during 2 of the cylinder checks (#3 & #4 cylinder). #3 cylinder whistling was quite loud and seemed to come from the oil pan/oil filter housing-holes (I have my oil filter housing off for re-sealing). Is this normal? I've never done a leak down test before on any other vehicle so I'm not sure what to expect from this noise.
My leak down indicated the following results:
cylinder #1: 2% leak
cylinder #2: 2% leak
cylinder #3: 4% leak
cylinder #4: 3% leak
I believe that the test indicates a solid engine, but the whistling in #3 cylinder really bothers me. I didn't hear any type of noise in #1 and #2 cylinders and #4 cylinder was only a very faint whistle.
Thanks,
*****
I just did a leak down test for my '86 951 to check for bent valves and I heard some hissing/whistling noise during 2 of the cylinder checks (#3 & #4 cylinder). #3 cylinder whistling was quite loud and seemed to come from the oil pan/oil filter housing-holes (I have my oil filter housing off for re-sealing). Is this normal? I've never done a leak down test before on any other vehicle so I'm not sure what to expect from this noise.
My leak down indicated the following results:
cylinder #1: 2% leak
cylinder #2: 2% leak
cylinder #3: 4% leak
cylinder #4: 3% leak
I believe that the test indicates a solid engine, but the whistling in #3 cylinder really bothers me. I didn't hear any type of noise in #1 and #2 cylinders and #4 cylinder was only a very faint whistle.
Thanks,
*****
