Cam Timings 924 won't start

[xp3000]

Hi,

I have a porsche 924 N/A, the car itself has been stood around for the last 6 years hasn't been started in this time.

I've replaced the following: oil + filter, drained old fuel via pipe and put 22litres of new fuel in with fuel cleaner, air filter, spark plugs, battery, dizzy cap + rotor arm.

I've also replaced the cam belt + alt belt, however when I replaced the cam belt this's how i done it.

On the top cam pulley I lined the small dot on the pulley in-line with the pointer on the engine case, I then looked at the rotor arm and setup the firing order of 1-3-4-2.

However when I try and start the car the engine just turns over and nothing else, I even tried to put cold-start in the air-filter to see if it was a fuel issue, this didn't do anything.

what have I done wrong or what should i check?

[924RACR]

The dot on the front or backside of the cam pulley? You need to use the dimple on the backside, common mistake. Make sure also that it's still in the right place AFTER tensioning.

What year is the car?

Do you have spark?? Always the same order to check, on any engine: spark, fuel, air...

[xp3000]

Hi,

Thanks for your reply, it's a 1982 N/A

I've just tested each ht lead and all spark plugs are getting a spark.

I'm going on the little small dot that's on the back of the cam pulley.

Cam Pulley lined up


rotor arm when cam pulley is lined up


This's when the HT leads are lined up

[924RACR]

Oh, OK, there's your problem.

Cam timing is correct, thanks. But the distributor position looks all funked up. Rotor is supposed to point to the rear-most bolt on the intake, and the distributor body should end up with the electrical connector for the Hall-effect sensor almost straight down, with the vacuum diaphragm bit on top near to the firewall. This will put your #1 plug lead about where the #3 is currently (on the cap, relative to the distributor - of course relative to the engine it'd be where the rotor is pointing, so where the #4 lead is)...

That should help just a bit... though you'll also maybe want to confirm that you have fuel delivery...

[xp3000]

Hi,

Thanks ever so much for your reply, however my knowledge isn't as good as yours so I've kinda lost with your reply, what steps should i do moving forward?

when I'm turning the engine over I can smell fuel, also I've tried putting cold-start into the air filter which doesn't help, so I don't think it's a fuel issue.

[emoore924]

You need to get the dizzy set up right, like was mentioned. That little spaceship-looking thing on the side of it where the vacuum hose is connected needs to turn about +120 degrees clockwise to be properly oriented. Go have a look on 924.org. There will be lots of pickies there. I don't know whether having it in the right orientation will matter on the way the dizzy works but it sure helps the discussion.

There's a small mark on the rim of the dizzy that you need to line up the rotor and time the ignition. The rotor should point to that mark (and the #1 plug wire should be right above the rotor when you put the cap back on...)

Also, be sure the CRANK is timed with the cam and the ignition, or it won't work either.

3 things:
1) dot on back of cam gear aligned with pointer on cam cover *after* belt tensioning
2) mark on rim of dizzy aligned with leading edge of with rotor (and #1 wire on cap)
3) crank at TDC (mark on crank pulley w/pointer on block or mark on flywheel with pointer through clutch observation port)

Do this. It'll work.

[xp3000]

ok, we've now got the flywheel mark 0 along with the crank pulley in line with the oil pump pointer.

The rotor arm is 180 out and the cam shaft pulley is 3 teeth out, I'm now going to adjust the rotor arm so it's in-line with the marking on the case.

how can i adjust the cam-shaft pulley so it's not 3 teeth out?

Can I take the belt off and then move the cam-shaft pulley 3 teeth forward to it's then in-sync with the flywheel or not?

I think we're almost there now

[924RACR]

Yes, sounds like you'd best pop the belt off and re-index the cam 3 teeth...

[xp3000]

ok, so we've now just taken off the belt and moved the pulley inline with the pointer, we've also setup the dizzy cap and moved it slightly so the diaphragm is directly infront of the cam cover see attached.

However re-moving the dizzy we've managed to snap one of the HT leads, so i'm going to have to replace these but the question I have is if we've timed everything up correctly would the car still start without #3 firing? (Just so I could see if we've timed the engine correctly now)

Is this correct is the way we've now set this up?

Flywheel


Crank Pulley


Rotor arm


Firing Order

[old 924]

my dist. is set the way his was..and i set mine from this pic from 924board just cus how he maked it...but i im dealing with start run's for a few sec's and die's prob.

[924RACR]

Wish I had a camera, could take a pic and show - no, still doesn't look right. Vacuum diaphragm should be about 90 deg clockwise, with rotor, as I said, pointing to the back bolt on the intake.

[ernie9944]

Originally Posted by 924RACR

Wish I had a camera, could take a pic and show - no, still doesn't look right. Vacuum diaphragm should be about 90 deg clockwise, with rotor, as I said, pointing to the back bolt on the intake.

Don't know to much about the 924,never own one but this pics from a brand new 924 migth help when it come the distributor position.

[924RACR]

Yes, thank you!!! That's much better...

[xp3000]

Ok,

After charging the battery up and replacing the HT leads the car still won't start.
I've just double checked the engine timings and all is perfect, also the rotor arm is correctly timed with the firing order.

At the moment all is happening is the engine is turning over and nothing else.

I've just checked #1 spark plug which is getting a spark also it's wet with fuel.