chefyong

Hi,

I own a 944S and plan to replace the Cylinder Head Pressure Reducing Valve (944 107 139 00). I found out that it cost $500+.

Does anyone know where I could just get the 2 O-rings or Oil seal of the valve?
Attached picture below.

Thanks to all.

V2Rocket

o rings are standardized...pull them off and find a hydraulic supply store near you, they should have a large selection of o rings and find something that matches.

ramius665

Just checked the PET and the o-rings are not listed separately. I'd follow Spencer's advice to source replacements.

KevinGross

Get BUNA-N 70 metric o-rings from ORingsAndMore or The ORing Store . I order from them frequently for transmissions for which Porsche no longer offers seal kits. They're the right part, and wicked inexpensive.

Kevin
Catellus Engineering, Inc.
catelluseng@gmail.com

chefyong

Thanks for all the help. I will try to reach them tomorrow.

michaelmount123

If memory serves me, you want #010 and #011 for replacements.
MM

Jay W

The pressure valve on mine was clogged up with debris and kept oil from getting to the top of the head after work done to replace the valves. Make sure to clean it out while you have it out. I cleaned mine and changed the o-rings rather than buy a new one

CVR_Rally

Yes there is little to go wrong with the valve other than clogging and o-rings. I actually put mine in a sonic cleaner then used compressed air to check operation. No need to buy a new one unless there is obvious damage.

Here is what mine looked like after cleaning.

Bryant1234

This is a long shot but how did you use the compressed air to test to see if it was working properly?

michaelmount123

Blow into a lower hole with an air nozzle while thumb and forefinger cover two of the (lower) holes. You should see the piston move up and at least partially uncover the upper holes. Watch the piston move up and down a few times as put the nozzle to the hole and remove it. If the piston doesn't stick, you're ready to reinstall it.