924Board.org

BillA · Joined: 27 Dec 2002 Posts: 170 Location: Syracuse, NY

I am in the final stretch of installing the motor in my 931. However, I did not pull the engine and I'm a newbie with the turbo's! Can anyone tell me where these lines connect to. I'm at a loss! This is like putting a puzzle together blindfolded!

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-nick · Joined: 16 Nov 2002 Posts: 2699 Location: Cambridge, MA

Easy - #1 connects to #3 and #2 is your oxygen sensor wiring - did you not notice the empty threaded hole in your downpipe where the o2 sensor goes?!

But... #1 should actually connect directly into the head and the Y connection in #3 should be removed. Do a search for "turbo breather update" or such and you'll find the discussion of it.

Make sure the braided hose from the crankcase is clear and also the line off the bottom of the air/oil separator that goes into the oil pan. The top of that line where the hose necks down gets rusty and clogged. Also, pop off the nipple it connects to and clean out the metal mesh.

I also see that you used an allen-head bolt on one of the turbo-manifold bolts. At the very least you need to coat that bolt with a hi-temp anti-seize (all those bolts actually). Even better is to replace it with a 17mm hex bolt and a steel spacer to raise the head of it above the manifold so you can get a socket on it.

And have fun

_________________
1980 931S
15psi boost, MS-II, EDIS, 951 IC, custom intake, Ford 5.0L throttle body, Forge BOV, WB o2, G31 w/LSD, 964 wheels, 968 rear sway, Bilsteins, 200# Welt. springs. A laptop, and a partridge in a pear tree.
1991 964 C4 Cabriolet

Paul · Posted: Mon Jul 30, 2007 3:52 am Post subject:

Stuff a rag into the outlet of the turbo before something falls in there.

Also sometime in the past, or maybe even now, the rear seal on your brake master cylinder leaked. Your booster may have brake fluid in it.
_________________
White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.

Paul · Posted: Mon Jul 30, 2007 3:57 am Post subject:

Also the orange valve cover seal looks like it is installed incorrectly.
_________________
White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.

BillA · Joined: 27 Dec 2002 Posts: 170 Location: Syracuse, NY

Thanks for the inputs! It always helps to have a second, even third set of eyes, never caught the valve cover and the Brake booster leakage. Went back and looked, can't believe I missed those!