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bcblase · Joined: 23 Oct 2007 Posts: 574 Location: Winchester, VA

Oh cr*p - an intermittent noise is coming from inside the cam tower - sounds like a "clacking" or dull tapping noise when the engine revs down and approaches idle...

Everything seems fine except the engine seemed to run a little warm last night during the test drive.

BC
_________________
1987 Porsche 924S - track toy
1986 Mercedes 190E 2.3-16v - autocross
2007 F-150 5.4L Lariat Supercrew - tow beast
1994 Volvo 850 Race Wagon - 24 Hours of Lemons Car
2001 BMW 325xi - daily driver

gohim · Joined: 02 Nov 2002 Posts: 4459 Location: Rialto, CA

Probably a failing lifter, but you should pull the access plugs and look around inside for loose parts that might have fallen off.

Complete used Cam Tower Assemblies are cheap, because often times in the case of an engine failure (broken belt), they are the only part that survives undamaged (salvagable/reusable).

I usually have two or three spares sitting around for that very reason. No, I have wrecked that many engines, it's just that I come across alot of damaged engines, and Cam Towers Assemblies are not that desirable or valuable (unless you need lifters, and you don't want to pay for new ones, or you have had a rare Cam Tower Component failure).

Cam Towers are not sold as completed assemblies by Porsche, and the individual parts are fairly expensive if you need new parts from Porsche. But the cost of used Cam Tower Assemblies only ranges between $25-$100. The last one that I bought on a lark around last Thanksgiving cost me $10. It's damaged due to lubrication failure, but will still yield some useful parts at a fraction of the new Porsche Parts Prices.

bcblase · Joined: 23 Oct 2007 Posts: 574 Location: Winchester, VA

Maybe I can find one for cheap in Hershey tomorrow?

Loose parts? - that doesn't sound good...

BC
_________________
1987 Porsche 924S - track toy
1986 Mercedes 190E 2.3-16v - autocross
2007 F-150 5.4L Lariat Supercrew - tow beast
1994 Volvo 850 Race Wagon - 24 Hours of Lemons Car
2001 BMW 325xi - daily driver

Stampedetrail · Joined: 29 May 2005 Posts: 274 Location: Fairbanks, Alaska

Maybe I'm paranoid, but I'd say check if it's your timing belt is loose and slapping against the cover. It will happen to warn you that it's too loose. Definitely a sharp intermittent clacking that will go away when the belt is tensioned.
_________________
1977.5 924 "Martini" head / New Old Stock rebuild
1985.5 944 Why? Because I can.

gegge · Joined: 27 Jul 2007 Posts: 1124 Location: Sweden

Did you find out what it was?

Got the exact same thing on my 2.0 engine.
_________________
Carl Fredrik Torkildsen

924 turbo -81 Carrera GT RESTOMOD
924 turbo -80 Dolomite De Luxe
924 -85 DP kit, BBS RS, M030 and tuned engine
924s -86 Black on black turbo with Fuchs

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

Time to adjust your valves gegge.
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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

bcblase · Joined: 23 Oct 2007 Posts: 574 Location: Winchester, VA

Turns out the clacking noise was intermittent, and I traced it to the new strut brace rattling against the fuel rail. A tightened wire tie seemed to fix the problem for the most part.

Phew! - thought that was going to be an expensive fix.

BC
_________________
1987 Porsche 924S - track toy
1986 Mercedes 190E 2.3-16v - autocross
2007 F-150 5.4L Lariat Supercrew - tow beast
1994 Volvo 850 Race Wagon - 24 Hours of Lemons Car
2001 BMW 325xi - daily driver