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Join Date: Jan 2007
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#3 cyl. noise iden?

Warmed up the car last Sat. drove about a mile (never over 2500 rpm). Engine just stopped no warning. I pulled the car over and restarted with no problem except a noise was coming from the engine like a value or rod was bad. Oil pressure is good - no change from normal. Noise appears to be coming from #3 cycl. removed valve cover everything tight nothing loose. Removed starter. Again everything looks OK but when the engine is started it has a major knock in the area of the #3 cycl. (1986 930 - 47K miles. Eng. refreshed at 40K, K27, Andial intercooler

Any thoughts on what the noise is?
Old 09-29-2007, 07:24 PM
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You could try removing the spark plug wire from that cyinder, or the others one at a time while it's idleing.
If it's rod knock the sound may change some.

It may be a bad idea (risk of more damage) to run it at all with it the way it is so... start it again at your own risk.
Old 09-30-2007, 09:27 AM
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I noticed in your post that you removed "valve cover". Did you remove both valve covers or just the one? With these engines it's pretty hard to isolate a noise, because they are so damn noisy to begin with. Go get a stethoscope at a parts house and it will help you isolate the sound.
What's disconcerting is the engine stalled when the noise first appeared. That makes me lean towards a spun bearing, but you said you never went over 2500 RPM.
This may sound silly, but check your spark plugs. A loose spark plug will give you a sound that you swear the engine is going to disintegrate.
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'85 930 Factory Special Wishes Flachbau
Werk I Zuffenhausen 3.3l/330BHP Engine with Sonderwunsch Cams, FabSpeed Headers, Kokeln IC, Twin Plugged Electromotive Crankfire, Tial Wastegate(0.8 Bar), K27 Hybrid Turbo, Ruf Twin-tip Muffler, Fikse FM-5's 8&10x17, 8:41 R&P
Old 10-01-2007, 07:39 AM
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Check your headstuds too after removing both valve covers.
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Old 10-01-2007, 11:35 AM
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I or I should say my mechanic used a stethoscope to isolate to the #3. I will suggest to him that he pull the spark plug wire on #3 to further confirm.

Thanks for the input. I'll keep you posted once we decide on a final course of action. It is looking more like we will need to pull the engine.
Old 10-02-2007, 06:53 PM
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Quote:
Originally Posted by WERK-I View Post
What's disconcerting is the engine stalled when the noise first appeared. That makes me lean towards a spun bearing, but you said you never went over 2500 RPM.
#3 or #6 are certainly the ones most prone to spin, I'm told. I span #6 bearing sub-3000 RPM in traffic, so it can be done.

About 1000 miles after an overrev, and I thought I'd dodged the bullet... A few weeks later still running great, shifted up into 3rd @ 40 MPH (915 box) and suddenly lost power when the clutch went home and I had to use surprising amounts of gas to prevent RPM dropping off. Then the scary noises started a few seconds later, when I was still thinking WTF?

The rod bolts can be over-stressed and just let go anytime afterwards they feel like, I think. My wrench says he's had 3.2's that just let go for no identifiable reason whatsoever (same crank, rods, bolts). I hate the factory rod bolts.
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Last edited by spuggy; 10-03-2007 at 04:27 AM.. Reason: Fixed quote
Old 10-03-2007, 04:27 AM
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Thanks Spuggy. Your description of the bearing failure is very similiar to mine.
Old 10-03-2007, 05:16 AM
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