[Vwdiesel] Injection pump questions
mikel at buncombe.main.nc.us
Sat Mar 10 07:51:05 EST 2007
The IP on my Jetta 1.6TD has a leak that comes and goes, I think it's
the o-ring between the pump body and the distributor head; when its
below freezing it will leak from a couple to several drops a second, and
it will stop once the engine warms up.
After seeing an article and pictures on doing the o-ring replacement on
a TDI IP, I'm wondering if the procedure would work for the older IPs.
In brief, the injection lines are removed and the pump head is backed
out from the body until the o-ring is visible in its slot, then a new
o-ring is slid on over the distributor block to replace the old one.
1) In the article it says something about using a viton o-ring, and
viton having a better "memory", as far as returning to it's original
size after being stretched. It also mentions that viton would be the
best choice as far as its resistance to degradation caused by various
fuels. I can't seem to find anywhere that carrys the specific o-ring ,
or any site that has much info about any o-rings I can get from them.
Actually, the only place I've found that offers a kit is
Is anyone familiar with them, or know of a good source on-line, for
either the o-ring, or just good info on o-ring selection?
2) I had an old NA IP laying around and removed the distributor-block
completely, so am now a little familiar with the difficultys of
reassembly - I think I got all the parts back in it the right places on
the 4th or 5th assembly attempt, ended up using some multi-purpose
grease to hold things in place while reassembling - at least it seems to
turn over by hand as it did prior to disassembly, but I don't know if
the pump was working to begin with.
Anyway, I'm wondering if turning the thing over by hand would give an
indication as to whether things are working properly inside, or would
the pump need to be powered somehow to verify that it's working - after
reassembly, I filled it with fuel, hooked up 12V to the solenoid, and
tried turning the pulley, but had no sign of fuel trying to spit, or
even dribble, out of the injection ports - just wondering if there's a
valid way to test it upon reassembly without having to reinstall it,
were I to go ahead and take the TD IP apart to replace the seals.
3) I have another NA pump that I'm thinking may work as a temp
replacement for the leaking one, wondering if it should be a bolt-on
replacement, provided it is still in running condition - Any tips would
be appreciated in how to check it, it's been sitting around for quite a
while, but has a mix of fuel and ATF in it and feels about like the leaking
IP when you turn it by hand.
Thanks in advance for any info.
Mike in NC
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