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1978 924 start issues

 
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dhesip  



Joined: 05 May 2018
Posts: 3
Location: Seattle

PostPosted: Sun Jun 03, 2018 7:33 pm    Post subject: 1978 924 start issues Reply with quote

Just picked up a 1978 924 that my dad and I are looking to restore. the previous owner had the head gasket redone and then it wouldn't start. we checked the fuel pump by lifting the plate on the cis and it works, its getting spark, I think the timing is not correct or the distributor is not in the correct position. there is just one dimple on the top camshaft sprocket and one notch on the crankshaft pulley. pictures would be helpful!
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MikeJinCO  



Joined: 08 Jun 2010
Posts: 717
Location: Maysville, Colorado

PostPosted: Mon Jun 04, 2018 12:05 am    Post subject: Reply with quote

On my rebuild I believe I used the '78 cam the dimple on the front is for some other application. There is either a dimple or a small slot on the back of the cam gear which should line up with the pointer on the cam cover. My old '77 cam had a dimple, the newer cam had the slot. I have a couple of newer cams and they all have the dimple.

The cam gear lines with the pointer on the cam cover, the notch on the pulley lines with its pointer on the oil pump and look with a flashlight behind the intake manifold for a hole in the bell housing for a line on the flywheel lines up with the the bellhousing casting. A bit of white paint on all these help.

For the Distributor there is a mark on the housing edge near the electrical connection and the the centerline of the rotor should line up with that mark. For me the distributor mark is the least obvious. The distributor drive is a spiral gear not just a flat slot like an old Chevy so getting the distributor right can take a few tries.

Do a search for distributor timing, there are several excellent articles.
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KDJones2000  



Joined: 14 Sep 2010
Posts: 292
Location: Phoenix, AZ

PostPosted: Mon Jun 04, 2018 7:40 am    Post subject: Reply with quote

+1 with Mike on the stupid camshaft marking.

Use the mark on the REAR of the camshaft sprocket, not the obvious one on the front. Once you get the valve timing correct, then set the distributor timing.

I did the same thing the first time I rebuilt the engine on my old '78 - using the correct mark should fix things up.
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dhesip  



Joined: 05 May 2018
Posts: 3
Location: Seattle

PostPosted: Wed Jun 06, 2018 9:10 am    Post subject: Reply with quote

could you attach the link for the distributor timing? i cant find it.
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Paul  



Joined: 02 Nov 2002
Posts: 9319
Location: Southeast Wisconsin

PostPosted: Fri Jun 08, 2018 12:46 pm    Post subject: Reply with quote

http://members.tripod.com/darrin_smith/porsche/924cam.html
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Silver 98 986 3.6l 320 HP "Frank N Stein"
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Owned and repaired 924s since 1977
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Paul  



Joined: 02 Nov 2002
Posts: 9319
Location: Southeast Wisconsin

PostPosted: Fri Jun 08, 2018 12:50 pm    Post subject: Reply with quote


_________________
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
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Paul  



Joined: 02 Nov 2002
Posts: 9319
Location: Southeast Wisconsin

PostPosted: Fri Jun 08, 2018 12:53 pm    Post subject: Reply with quote

http://im1.shutterfly.com/procserv/47b3cc32b3127cce9cba45479b2b00000016108AZuGrlozZtE
_________________
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
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dhesip  



Joined: 05 May 2018
Posts: 3
Location: Seattle

PostPosted: Sun Jun 10, 2018 4:06 pm    Post subject: Reply with quote

Thanks Everyone! it seemed to be that the ignition distributor wasn't installed correctly by the previous owner. we set the timing and double checked everything and it fired right up!

new problem though, it'll only stay running if I give it gas, if not then it'll die. thinking the idle needs to be adjusted? any thoughts?
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Mr Bitey  



Joined: 23 Sep 2011
Posts: 54
Location: Perth, Western Australia

PostPosted: Mon Jun 11, 2018 12:50 am    Post subject: Reply with quote

I had a similar problem and it ended up being a stuck piston on the fuel distributor. i had a lot of old gummed up fuel.

Tip: Don't pull the fuel distributor apart unless you really need to, was a pain in the arse trying to get it back together.
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Fasteddie313  



Joined: 29 Sep 2013
Posts: 1549
Location: Not Detriot - NMI

PostPosted: Mon Jun 11, 2018 4:22 am    Post subject: Reply with quote

Make sure you don't have any vacuum leaks and replace any cloth covered vac lines..

Yep, if it won't run decent give it real stiff hit of Techron
in the gas tank.. Like a full bottle of that to 1/4 tank of fuel..

Really first you should drain the tank, pull the intank fuel pump, and see how clean/nasty it is in there first..

Make sure that's clean then give it the techron..
Then set up for an injector flow test, injectors in bottles, and pump gallons of techron fuel out of your injectors before you pronounce anything dead..
Leave it sit overnight and pump some more the next day if it still hasn't cleared up..
Put the gas back in your tank unless it's nasty..

No matter your results, you should then do a CIS pressure test..
Buy the gauge setup or just make one..
It's the top middle port of your FD, you want to take that line off of your FD then you need an adapter to fit the FD there - hose - gauge - valve - hose - adapter to connect back to the line.. Then follow the simple test procedure..
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