924Board.org

Clbmkr1 · Joined: 21 Jul 2010 Posts: 76 Location: Wind Point, Wi.

My 1980 931 has a loud squealing sound when the dump valve releases pressure; Normal?
_________________
Jim Baldwin
1980 931
2013 Lincoln MKZ
2013 Ford Escape

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

Nope. Seems more likely to be coming from somewhere else. . .you sure it's the recirc valve?
_________________
Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

Cedric · Joined: 27 Aug 2004 Posts: 2810 Location: Sweden

If it is from the recirc valve, maybe it stucks halfway. I had a problem where the old gasket in the valve just melted and smered along the walls of the valve piston. Made the valve stuck open, no sound though but no boost either. Solved by buying a new gasket from porsche.
_________________
1980 924 Turbo
www.instagram.com/garagecedric/

Clbmkr1 · Joined: 21 Jul 2010 Posts: 76 Location: Wind Point, Wi.

It only squeals toward the top of the boost range, then stops as soon as you let off. It just started over the weekend.
_________________
Jim Baldwin
1980 931
2013 Lincoln MKZ
2013 Ford Escape

Smoothie · Posted: Fri May 27, 2011 4:51 am Post subject:

Any chance it's a loose/leaky wastegate control line?
They're known to make a high pitched sound..
_________________
"..it's made in Germany. You know the Germans always make good stuff."

'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox

Clbmkr1 · Joined: 21 Jul 2010 Posts: 76 Location: Wind Point, Wi.

This turned out to be a loose connect at the bottom junction of the boost tube. Tightened the two bolts, now its fine.

Thanks,
_________________
Jim Baldwin
1980 931
2013 Lincoln MKZ
2013 Ford Escape