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Posted by: saigon71 May 9 2016, 03:48 PM

1974 D-Jet, 2056CC.

I pulled my disty apart two years ago to clean and grease it. Ever since then, about every 800-1000 miles, the engine starts to run poorly. The cause, oily trigger points. I pull the trigger points, replace them with a set pre-cleaned with denatured alcohol and drive problem free until it happens again.

For quite a while, I thought I used too much grease on the top when lubing it and it was leaking down and fouling the trigger points. Now, I'm pretty sure the oil is coming up from the engine side and causing the problem.

Disty to case seal is brand new.

I just took the disty apart again. From top to bottom, there is a fiber ring then two steel washers. After the shaft passes through the disty, there is one fiber washer, then one steel washer before the drive pinion. Is this layout correct?





Any other suggestions on the subject would be appreciated. Swapping trigger points and re-timing the engine every 1K miles is getting old.

Thanks!

Posted by: r_towle May 9 2016, 05:47 PM

How is your PCv valve.
If I recall correctly, the oil pressure in that location should not b that high.
So.....maybe look at the case pressure and venting system.

Posted by: ejm May 9 2016, 07:45 PM

Nothing to do with your problem
Oil on the trigger points was a problem the factory recognized. Later trigger points have a tab that deflects oil from getting on them. Lets see a pic of yours. The fiber and steel washers are for thrust, the spiral cut in the shaft should control oil coming up from the crankcase. But like Rich said, crankcase pressure will force oil out of any and everywhere. Pulling the dist with the adj bracket saves having to re-time the engine.

Posted by: saigon71 May 10 2016, 01:54 PM

Here is a pic of my trigger points, I'm guessing the set on the right is the "improved" one, designed to keep oil off the points.

Posted by: saigon71 May 10 2016, 02:00 PM

Does anyone have a link to the PET diagram for the distributor? Pelican references a felt washer (and I don't have one). Additionally, I'd like to verify the position of the steel and thrust washers. Only the top half of their diagram shows up on the page.

http://www.pelicanparts.com/914/parts/engine/distributor_small.htm

Posted by: Puebloswatcop May 10 2016, 03:02 PM

I believe there is one in the Porsche shop manuals, I will check when I get home and let you know what I find

Posted by: saigon71 May 10 2016, 03:52 PM

I tested the PCV valve during rebuild with the very scientific "suck test." It seemed to be in order...may be worth replacing if I can find a new one.

Posted by: r_towle May 10 2016, 04:16 PM

I drilled mine out long ago

Posted by: Puebloswatcop May 10 2016, 07:14 PM

Hopefully this will help you out with the problem.







Let me know if you need more info

Posted by: saigon71 May 11 2016, 02:08 PM

Thank you for posting the PET. It's interesting that they only show the bottom fiber & steel washers.

Posted by: saigon71 May 12 2016, 07:11 PM

It's prime driving season, so it is painful to have the car down for more than a day or two.

Took a look at everything with fresh eyes last night and think I found a few problems. My upper fiber washer was originally installed above the steel ones. According to the PET posted by Puebloswatcop the fiber washer (at least the lower one) should ride against the distributor housing. I moved the top one down, below the top two washers so it will ride on the housing.

I installed the set of trigger points with the "guards" on them.

Additionally, my felt tab that rides against the distributor shaft was shot. It was sideways in the disty when I pulled it apart.

Picked up a self-adhesive furniture felt kit, pop-rivets and washers at Home Depot to rebuild the felt tab. I had to trim a little off the washer for clearance, but I think it will do the trick.

I'm still running a cracked, but intact fiber washer until I get the parts, but I think this may help. Thanks 914world!

Posted by: r_towle May 12 2016, 07:13 PM

Astro turf in the distributor?

Posted by: nordfisch May 13 2016, 01:58 PM

Hello,
in our D-Jetronic-forum someone just has disassembled a Bosch D-Jetronic - distributor (Mercedes-type).

He carefully casted out the sleeve bearing and found a shaft sealing ring beneath it.

Most likely that is the same in your distributor.

You will not get rid of the oil-problem without changing this sealing ring.

The felt part is only for regreasing the d-jet-camshaft and the fibre blocks a little bit - not for taking off that oil.

Here is the link towards the topic - sorry, German only: https://oldtimer.tips/en/forum2/ignition/437-m-116-zuendzeitpunkt-einstellen?start=20#4085
But you can communicate in Englsh there, too...

Regards
Norbert