[Vwdiesel] ALH injection pump

[James Hansen]

Yeah, this is pretty common, works with nearly any buna-n seal.  Use
anything that acts or is a seal swelling agent (a hydrocarbon that migrates
into the seal and either softens it or causes it to swell) the seal gets
bigger or softer, leak stops as long as the seal is intact, not cut.  Being
bigger, it wears in like that.  Change whatever fluid is being held in by
the seal so that the seal swelling agent is not present, the swelling agent
migrates out back to the fluid, the seal either hardens or shrinks.  Trick
is, now that it has worn in the swollen state, it leaks much much more after
shrinkage.  Played this game with a rear engine seal on a truck I had years
and years ago.  Forget to put in a pint of atf on an oil change, it starts
to drip on the driveway. add atf, it stops like magic overnight... until I
had the trans out and changed the seal.

I second the clean place to work and doing it yourself.  It is far from
precision work, all assembly technique if it's just a leaking seal, nothing
functionally wrong. However, that said, it's hard to replace experience.
Usually at a rebuild shop, there will be a guy that specializes in each
breed of pump.  The bosch guy is pretty busy, and that level of experience
is hard to duplicate- he can look at components and tell if it's junk or
good, where we are not so special in that respect.  But, it is quite
underwhelming to watch one being done by the pro shop- bench vice, clean
work area, impeccably clean prepared parts for reassembly, and technique.
Very few special tools. 
-james


-----Original Message-----
From: vwdiesel-bounces at vwfans.com [mailto:vwdiesel-bounces at vwfans.com] On
Behalf Of lbaird119 at aol.com
Sent: December-10-12 1:17 AM
To: tadc at europa.com; spsherm at msn.com
Cc: vwdiesel at vwfans.com
Subject: Re: [Vwdiesel] ALH injection pump


ATF will do similar. Did it on a trip where I was leaking badly.  Worked
great ('81 PU)  Dunno how long it would've lasted since that was the second
leak so I just said uncle and sent it for a reseal/rebuild.  I'd already
replaced the timing advance o-rings so soon after another went.  I didn't
feel like dealing with cascading failures
     Loren



-----Original Message-----
From: Tad <tadc at europa.com>
To: Stephen Sherman <spsherm at msn.com>
Cc: mailing list <vwdiesel at vwfans.com>
Sent: Sun, Dec 9, 2012 8:48 pm
Subject: Re: [Vwdiesel] ALH injection pump


My shaft seal leak came and went for years before it finally let go in a ig
way.  I attribute this to switching between BD and #2 (which I tried to o as
little as possible).

n Sun, Dec 9, 2012 at 12:00 PM, Stephen Sherman <spsherm at msn.com> wrote:
> Having replaced all the IP seals on my 01 Golf a couple of years ago, 
> I'd
 say it's a very doable job as long as you are careful and have a clean
place to work.  Don't think I'd attempt it outdoors, and certainly not in
winter.

 Check on youtube, there is a series of clips that take you through the
entire process.  Also search on TDI club. It is important that you have the
IP compressed before you slide the "distribitor" out to replace the Oring.
 Not hard to do but if you don't you may have things coming apart inside the
IP on you.

 I'd also try to determine where the leak is coming from. Unlikely you need
all the seals replaced, so would make sense to just do the one(s) that you
need.

 Also check on youtube, there is a clip there about someone who fixed a
leaky IP by running biodiesel.  If your leak isn't too bad this may work
for you, and would be a bunch easier than doing the seals.

 Good luck

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