924Board.org

Dmitry S. · Joined: 24 Feb 2005 Posts: 10 Location: Cupertino, CA

I'm finishing up my 924 rebuild, and unfortunately, the engine cranks very slowly.

The knowns:
-Battery is good. It will crank my Volvo to no end. Good voltage, did a load test on it, and passes with no problem. Tried my new S2 battery as well with no success.

-Engine spins freely and has pressure. Tested this by hand, and it spins like butter.

-Ignition timing is within a degree or two.

The iffy:
-I have an adjustable cam timing wheel and it has a couple of marks. I know i'm at least within a tooth or two.
-Starter is new, but has been sitting for a long time outside (2 years?)

Any help is greatly appreciated.
_________________
Now:
89 Porsche 944 S2 - Mostly stock
83 Porsche 944 - LSD, 951 Fuchs, Roll bar
79 Porsche 924 "S" - Lots of mods - parting
Past:
82 924
77 924
78 924
86 944 Turbo
88 944
88 944 Turbo S

Dmitry S. · Joined: 24 Feb 2005 Posts: 10 Location: Cupertino, CA

Forgot to mention that the alternator belt isn't hooked up yet, I've been trying to just start it on the battery.

Can't seem to find a belt the right size...
_________________
Now:
89 Porsche 944 S2 - Mostly stock
83 Porsche 944 - LSD, 951 Fuchs, Roll bar
79 Porsche 924 "S" - Lots of mods - parting
Past:
82 924
77 924
78 924
86 944 Turbo
88 944
88 944 Turbo S

tj924 · Posted: Fri Feb 25, 2005 7:51 am Post subject:

The alternator belt is a 10A890 (10mm width, 890mm length). The Bosch catalogue says they make this belt, but I can't source one in Australia so have to get the genuine belt. Others in your neck of the woods will be able to tell you where you can get one from.

Have you checked and cleaned all of the grounding points. That will make a HUGE difference.
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TJ
Silver '82 924 NA 5-Speed Manual

924guy · Posted: Fri Feb 25, 2005 10:08 am Post subject:

Lizard · Posted: Fri Feb 25, 2005 12:44 pm Post subject:

supply a new ground to the engine to correct issue as stated
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3 928s,

Laxsex · Joined: 18 Feb 2003 Posts: 13

like everyone else said, your problem is most likely in the ground side of teh circuit. Do an ohms check on the ground side to make sure that there is not excessive resistance

Dmitry S. · Joined: 24 Feb 2005 Posts: 10 Location: Cupertino, CA

Problem is mostly remedied. There was excessive resistance in the circuit. Cranks a lot better now.

Should have thought of this first, haven't been on 924board in a while (4-5 months, my account is now inactive), and the S2 has no rust. Forgot that it takes a much different state of mind to work on older cars.

Thank you for your input.
_________________
Now:
89 Porsche 944 S2 - Mostly stock
83 Porsche 944 - LSD, 951 Fuchs, Roll bar
79 Porsche 924 "S" - Lots of mods - parting
Past:
82 924
77 924
78 924
86 944 Turbo
88 944
88 944 Turbo S