924Board.org

[924OZY]

Hello,
I have just tried to do the timing on my 79 924 na and when the timing light lights up, the timing marks are about 180deg out,

done dodgily by the previous owner, problem is I don't know what the fu*k he has done!

Also when the cam marks line up the timing marks are about 180deg out on the crank.

It still runs and drives but I can't set the timing till I fix it any Ideas?
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924 N/A snailshell, superpro linkage bushes, 2.5"exhaust

4.0L ef Fairmont, 3000rpm stall, shift-kit, J3 chip, 3" exhaust, self tuned using tunerpro, soon to be boosted,
expecting 350Kw at wheels at 10psi.

[924OZY]

I know I can take the belt off and line it up properly with the cam pointer,
then check where the dist. rotor button is pointing, at TDC
Then fit the cap and start from there,
but heard it still be 180deg out if done that way?

Is there some sure fire way to get it right first time?

Seems like the previous owner has done nearly everything wrong so far.
_________________
924 N/A snailshell, superpro linkage bushes, 2.5"exhaust

4.0L ef Fairmont, 3000rpm stall, shift-kit, J3 chip, 3" exhaust, self tuned using tunerpro, soon to be boosted,
expecting 350Kw at wheels at 10psi.

[Smoothie]

[924OZY]

Thanks,
but that doesn't solve the problem.
I know about the cam mark at the back of the sprocket,
but it must still be out,
because the marks on the flywheel are about 180 out when the timing light goes off.

Thats the Problem

Could he have put the flywheel on incorrectly?
_________________
924 N/A snailshell, superpro linkage bushes, 2.5"exhaust

4.0L ef Fairmont, 3000rpm stall, shift-kit, J3 chip, 3" exhaust, self tuned using tunerpro, soon to be boosted,
expecting 350Kw at wheels at 10psi.

[Smoothie]

Yes, there are 6 flywheel bolts, and nothing to keep it from being re-installed incorrectly. -So it could be on there correctly, or any of 60, 120, 180, 240, or 300 degrees off. You can still check the timing with an adjustable strobe timing light, or by using the back of the cam sprocket and valve cover pointer. I have a pic around here somewhere...
Crank tdc can be verified manually with a wooden dowel through the #1 spark plug hole (for verifying correct timing belt installation).
_________________
"..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

[avaconirl]

You say you are using a timing light. I take it you have it on no 1 plug lead and you are trying to set the distributer timing , if so put the lead onto no 3 plug lead.

[924OZY]

Thanks heaps for that.
I am glad I didn't just take the flywheel marks as correct,
as I am sure thats what he has done wrong.

I guess I will draw another line where real top dead center is,
to make it easier in the future. Maybe on the front pulley too.

I will also try using no3 lead for the light as suggested.
Thanks again
_________________
924 N/A snailshell, superpro linkage bushes, 2.5"exhaust

4.0L ef Fairmont, 3000rpm stall, shift-kit, J3 chip, 3" exhaust, self tuned using tunerpro, soon to be boosted,
expecting 350Kw at wheels at 10psi.

[avaconirl]

Sorry i had brain fade when i said that to you !!!!!!!! I have a flu.
You should but the light on No 2 or No 4 thease are on the opposite plane i.e. 180 deg out from No 1.
P.S. I hope you dont mind me saying that No 1 IS at the front.

I hope this is of some help.

[924OZY]

G,day
To solve the timing problem I had to forget logic.
The previous owner just chucked the flywheel on however, and none of the marks line up, even when using no3 lead for the light. (I tried, it would fire but was rough). Tip here, dont assume anything, check TDC to be sure!!!

To find TDC I took out the no 1 spark plug and used a pencil to find where the piston was at its highest while rotating the crank pulley with a ratchet, socket+ extension, then wrote a new line on the crank pulley at tdc, (using nailpolish)

This also showed that the cam timing was ok.

Then I had to use this line, with the timing light to set the timing.
I drew a circle on a piece of cardboard the size of the crank pulley,
then drew lines to see 90deg, then broke that up to see how far 10deg would be (about 10mm). So then adjusted the timing using the timing light on the crank pulley, so it lit up when the line was around 10mm before TDC on the pointer.

Was a big Pain in the arse as nothing was as it should be. I'm sure glad I didn't try to set up the cam timing believing the flywheel marks!!!

I am sure this will happen to others, so don't believe everything you read, check to be sure!!!
_________________
924 N/A snailshell, superpro linkage bushes, 2.5"exhaust

4.0L ef Fairmont, 3000rpm stall, shift-kit, J3 chip, 3" exhaust, self tuned using tunerpro, soon to be boosted,
expecting 350Kw at wheels at 10psi.

[avaconirl]

Glad to see that you have sorted it out. It sometimes helps to look at these thing from a different angle, also it keeps the old brain ticking over.

[924OZY]

Thats for sure,
my brain is hurting now

Probably increases your mental capacity working on Porsches.
_________________
924 N/A snailshell, superpro linkage bushes, 2.5"exhaust

4.0L ef Fairmont, 3000rpm stall, shift-kit, J3 chip, 3" exhaust, self tuned using tunerpro, soon to be boosted,
expecting 350Kw at wheels at 10psi.

[Ozzie]

TDC is marked on the crank pulley. It cant be fit wrong.
_________________
Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance

[924OZY]

Roger that,
I'm sticking (stuck) with using the mark on the Pulley,
as they can't be fitted wrong.

Thats also what I am used to,
All my other cars had their timing mark on the pulley.
And I guess thats probably why most manufacturers do it that way,
It cant be fitted wrong!

Damn Flywheel.
Why doesnt it have a dowel or something so it can only go on one way?
I am not fixing it yet.
_________________
924 N/A snailshell, superpro linkage bushes, 2.5"exhaust

4.0L ef Fairmont, 3000rpm stall, shift-kit, J3 chip, 3" exhaust, self tuned using tunerpro, soon to be boosted,
expecting 350Kw at wheels at 10psi.

[Smoothie]

That pic for checking timing at the rear of the cam sprocket -


_________________
"..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

[Scorpio]