What did the oring that you took out look like?I just did this job the other day. I had purchased ID Parts’ High mileage TB kit, and it came with this o ring.
I knew I have had a coolant leak for the past couple of years, and mistakenly kept replacing the larger thermostat coolant pipe, thinking it was the culprit. Once I got that O ring in my kit, a lightbulb finally went on and I knew I had to check it out. Sure nuff, it was leaking.
The O ring that ID Parts sent me was the fatter one. The job certainly WAS a major PITA, but I got it back together, only to find that it still leaks. When I reinstalled the pipe, it took a TON of force to reinsert the pipe. Did I perhaps have the wrong O ring ( even though I gave ID Parts my VIN)?
Looking at the pipe now ( it’s still installed, gonna tackle it again tomorrow), it looks like the O ring “rolled” during reinstallation, as I can see a bit of it poking out where the pipe enters the block.
Wrong O ring, maybe? Is there a safe way to lube that O ring up to ease its passage into the block? If the fat one doesn’t work, will the round one work?
(Think your O ring job sucked? I have to do mine TWICE! )
It was the wide kind, and that’s what I replaced the first time.What did the oring that you took out look like?
It is 2 different pipes with narrow and wider gaps to accommodate the 2 different orings. Order one of each and you have it covered.
I don't think that I've ever encountered a leak at the N108 (cold start injector). The pumps came with Viton green orings in this position and they usually hold up very well in comparison to the black orings used elsewhere on the pump. The black ones will flatten out and crack with time and miles.It was the wide kind, and that’s what I replaced the first time.
I went to my local VW parts store and bought another one today with the idea of putting it in. But I ran into a dilemma:
I read elsewhere in this thread that the underlying cause of the seal going bad is exposure to diesel fuel from some part of the injection pump that is leaking. So before I started the disassembly I looked, and sure enough there is puddled diesel in some areas below the IP.
I’d like to take care of this issue now. Any advice would be very welcome.
From what I can see from the Bentley diagrams, there are replaceable seals on:
-each of the four injection lines,
- the cold start injector
- the timing control cover
- fuel shutoff valve
- the supply line from filter
- the return line to the filter
the only one that seems to be leaking is the timing control cover. (It is also the lowest point in the IP). Placing my fingers under there they come up wet and it smells like diesel.
For the life of me I cannot find the cold start injector, so I can’t rule this out as a potential leak spot.
1. Is there anywhere else I should look for leaks?
2. Is the removal of the IP necessary for any of this?
In your experience, is replacing these seals sufficient to stop the leaking of fuel from the IP? Is the timing control cover a common leak spot? Anywhere else I should look?I don't think that I've ever encountered a leak at the N108 (cold start injector). The pumps came with Viton green orings in this position and they usually hold up very well in comparison to the black orings used elsewhere on the pump. The black ones will flatten out and crack with time and miles.
The N108 is right under the pump head where the injector lines attach. Its behind the plate that attaches the back of the pump to the accessory bracket.