924Board.org

icemansam88 · Joined: 03 Oct 2012 Posts: 4 Location: Waynesboro, PA

Alternator
I have a 1987 Porsche 924s that I have had for a few months when I got a flat tire and it sat for a month or two. Well I got the tire fixed and was ready to run and it wouldn’t start!!! The first thing I did was get the jeep and jump the Porsche, well it started up but sounded like it wasn’t getting enough electric. I took the cables off and it died slowly, so I put the cables on started the Porsche and left the jumper cables on for about 20 minutes, when I took them off again it ran for about 15 seconds and died again. I am thinking it’s the alternator, so I did some searching and read somewhere that the best place to get access to the alternator is under the passenger seat through an access door. Does anyone know if this is correct before I tare my seat out?
Thanks

Harm · Joined: 02 Apr 2009 Posts: 1376 Location: Holland

scm924s · Joined: 22 Oct 2010 Posts: 296 Location: Gloucester UK

And to answer your question, the alternator is at the front of the engine driven by one of the exposed belts, and is accessed by removing the undertray.
_________________
1984 n/a Ruby Red Metallic
1988 924S Guards red- sold
1986 924S Guards Red - sold
1984 n/a Black - sold
1980 n/a Le Mans#1 - sold
1980 n/a Le Mans#2- sold
1977 Martini - sold

icemansam88 · Joined: 03 Oct 2012 Posts: 4 Location: Waynesboro, PA

When was the last time it got it's Front of Engine Service (FOES)?
That should be first on your list!

Not to sound like a complete dumb as... Could you explain what you mean by FOES and I dont mean Front of Engine Service, lol I mean what type of service does this include?

Thanks for taking the time to explain

fiat22turbo · Joined: 18 Jan 2006 Posts: 4040 Location: Portland, OR

Timing belt, tensioner, water pump, seals.

Here's some handy technical steps to help out:

http://www.clarks-garage.com/shop-manual/repair-procedure-index4.htm

Start by reading up on the maintenance interval for the timing belt:

http://www.clarks-garage.com/shop-manual/eng-04.htm

If this isn't followed, the timing belt could fail and the pistons will hit the valves and do some pretty serious damage to the internals of your engine.

Here's how you change the belt:

First remove the belt:

http://www.clarks-garage.com/shop-manual/eng-05.htm

Then install and tension the belt:

http://www.clarks-garage.com/shop-manual/eng-06.htm

And BTW, here's the alternator replacement steps:

http://www.clarks-garage.com/shop-manual/elect-01.htm

If you search online you can find some videos and pictures that describe the details.
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Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose)

Harm · Joined: 02 Apr 2009 Posts: 1376 Location: Holland

@icemansam88
Your e-message got delayed by my spam filter…
@ fiat22turbo
Thank you Stefan.

Regards, Harm.

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

ROTFLMAO
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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

icemansam88 · Joined: 03 Oct 2012 Posts: 4 Location: Waynesboro, PA

Today I spoke to a porsche mecn who told me that the reason my 924 wont start isnt because my alternator is died, it could because my battery is so died that the alternator doesnt see it and wont charge to it. Has anyone else heaard of this?
Thanks for all your posts
Sam

fiat22turbo · Joined: 18 Jan 2006 Posts: 4040 Location: Portland, OR

Yes. Alternators won't charge a battery, only really maintain their charge. If the battery is dead, then you'll need to charge it with a real battery charger or you could damage the alternator.
_________________
Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose)

icemansam88 · Joined: 03 Oct 2012 Posts: 4 Location: Waynesboro, PA

Hello all,
Last night I switched batterys from my jeep to the porsche and it started right up, now as soon as I took the negitive cable off the battery it died. After that i figured it was my altanator and put the battery back into my jeep which after I tried to start the jeep, it started but you could tell that the porsche really drained it. So it looks like I am going after a new alternator tonight...

Paul · Posted: Fri Oct 12, 2012 12:15 pm Post subject:

If it wasn't the alternator, it most likely was as soon as you removed that cable with the motor running.
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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.

joejax · Posted: Sat Oct 13, 2012 10:07 am Post subject:

Whuh?

_________________
I got nothin'
Uhhh...you got any pics?

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

Removing the battery from a running engine with alternator removes the reference voltage, which the alternator uses to control the voltage output.

Without the reference voltage, the alternator's output voltage is uncontrolled, and it will self-destruct.

joecitizennn · Joined: 12 Sep 2005 Posts: 2096 Location: no mans land

This would have been a much more interesting post if you had torn your seat out and cut a hole in the floor before posting.
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87 924s
88 924SE gone
447 hp cgt clone
87 924S gone
84 944 sold
83 944 sold
89 turbo S LSD, ABS etc
86 951 white rocket
85 944 sport everything.
84 944 sold.
87 944 sold

joejax · Posted: Thu Nov 29, 2012 8:59 am Post subject:

Hee hee...

_________________
I got nothin'
Uhhh...you got any pics?