924Board.org

[jimcarver]

Hey guys having tried pretty much everything else i am gonna replace the o rings in the fuel distributor pressure regulator.
I looked through previous post below and have the part numbers for the o rings. 911 110 936 00 and 900 123 033 20

http://www.924board.org/viewtopic.php?t=20694&postdays=0&postorder=asc&highlight=hot+start+fix&start=0

Now for the questions...

There is a pic at the bottom of the first page (posted by paul) does anyone know the part no of the copper washer, as its just listed as "Parts kit" In the PET.

Lastly is it just a case of taking out the regulator and preplacing the o rings and washer and putting it all back on. Or will i mess up the holding pressure of the system by removing it, as the shims will have moved.

Cheers

[RC]

Although Porsche dont reccommend it, you should be able to reuse it. The O rings are METRIC and available at most industrial, hydraulic or fastener supplier. From memory the small one is 3x1.6, but if you take the old ones they can be matched, the copper washer too. It measures 1.0 mm new and since its thickness will affect your pressure, should be similar thickness.
Use rags around the job as fuel will be pressurised unless the motor hasn`t run for many hours. Take it easy, so U dont loose the (2) shims. If the valve is stuck try a piece of rubber hose or dowell(chopstick) to remove it.
Replace the O rings and assemble, lubricating with petrol, insert piston then the spring already placed in the cap to retain the shims, thick one spring side.
Piece of cake really.

Cheers, Roger

[Mike924]

Generally +1 to what RC said.

You need to make sure the o-rings are made of fuel-resistant rubber, which may be harder to find. The copper sealing washer is a general part (aluminium is getting more common these days and is jsut as good).

A friend who run a CIS-equipped Ford informs me that ordinary M4 washers can be substituted for the shims, if the pressure needs to be reset.

Good luck (presumably, new HT leads didn't help?)
_________________
1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd

'There is no substitute for a little grease under your fingernails.' - Chrenan, 924board.org

[jimcarver]

Cheers fellas.

I assume by the "chopstick" method of removing the stuck valve you stick it in where the spring was and carefully work it out, or am i misunderstanding this?

If the copper washer is a general part i prob have one left over from replacing the fuel pump check valve, assuming it the same one?

[Ozzie]

The ROW cars dont have O2 sensors or frequency valves so the pressure reg is different to that picture.
Only 1 "O" ring is used, shims should be fitted or removed depending on system pressure.
Agree about alum seal, or copper, standard part anywhere.
_________________
Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance

[Mike924]