High Pitch Squeal From Engine with Belts Off - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Topless · 04-17-2010, 12:52 PM

Best guess without hearing it... worn timing chain tensioner guides. A common problem.

eightsandaces · 04-17-2010, 01:24 PM

what is the mileage?

jcb986 · 04-17-2010, 03:52 PM

Quote:

Originally Posted by eightsandaces

what is the mileage?

2000S...3.2 ltr...tip...68,000

mmontfort · 04-18-2010, 06:18 AM

AOS needs replacing.

jcb986 · 04-18-2010, 07:58 AM

Yes, I just ran the engine until it started squealing...loosen the oil cap up and it stopped. Looks like I will replace here soon, was going to change the oil and install a new fuel filter, so I will do this all at once. Thanks.

deliriousga · 04-20-2010, 07:35 PM

When you replace the AOS, replace the hose that connects to it (not the little bellows that's on the bottom of the separator). Mine had a small crack in it and that is what caused the squeal after I replaced the bad AOS

.

jcb986 · 04-21-2010, 05:09 PM

Quote:

Originally Posted by deliriousga

When you replace the AOS, replace the hose that connects to it (not the little bellows that's on the bottom of the separator). Mine had a small crack in it and that is what caused the squeal after I replaced the bad AOS

.

I purchased everything but bottom hose. Seems no one changes it.