Injection pump leaking, any ideas?

VW Jon · Post by **VW Jon** » Fri Mar 21, 2008 12:28 am

Do a search for Delco Diesel in Oklahoma. That's where I bought the DGK-126 kits.

tylernt · Post by **tylernt** » Fri Mar 21, 2008 12:42 am

rcw7585 wrote:People have referenced their "Local Bosch" supplier, but I know of none.

Just about any major city has a place or two that will service those 18-wheeler big rigs. Just look for Fuel Injection or Diesel Service in the Yellow Pages.

danfromsyr · Post by **danfromsyr** » Mon Jun 16, 2008 11:20 am

reading thru this entire thread and hoping to do this procedure one night afterwork this week..

I had thought there was a write up with images? maybe on the TDI board.. I'll have to check before I undo the pumphead..

is the center bolt extension&holder necessary part? I have the 4 bolts for the pump head to slide out on.

thanks

Dan

libbybapa · Post by **libbybapa** » Mon Jun 16, 2008 3:21 pm

If you don't keep the plunger firmly pressed against the rollers and camplate, then one or more little parts might fall out of place inside the pump and disaster will result.

Andrew

danfromsyr · Post by **danfromsyr** » Tue Jun 17, 2008 9:18 am

Well, went down to the local big box and bought a longer 8mx~40mm bolt for the center hole to keep tension on the camplate.
was able to turn all 3 bolts by hand thru the procedure. 2 pump housing bolts and center camplate retaining bolt.
they have differing thread pitches so the ramp rate of the screws would on occasion bind but only by finger tight
turn 2 housing bolts (in or out) then turn cam plate retianing bolt.. just a little routine to a controled movement of the pump head.

I won't know full success till after I get the rest of the stuff done.. will be changing the throttle cable next. and have to rewiring todo in the engine bay to make me happier. trying to get Dad's work van back on the road after sitting for ~6months.. seems every car in his yard gets the doors stuck if left sat for a few months..

vw_commuter · Post by **vw_commuter** » Wed Jun 18, 2008 10:44 pm

danfromsyr wrote:reading thru this entire thread and hoping to do this procedure one night afterwork this week..

I had thought there was a write up with images? maybe on the TDI board.. I'll have to check before I undo the pumphead..

is the center bolt extension&holder necessary part? I have the 4 bolts for the pump head to slide out on.

thanks

Dan

The post with pictures is here.

I saved the page locally with all of the pictures because you never know when a link will go dead.

Greg

jolotter · Post by **jolotter** » Fri Jul 10, 2009 4:23 pm

I did the procedure today. I had to convince the diesel shop I knew what I was doing in order that they would sell me the kit, but then got them to throw in a second seal for the high pressure head. I'll use the kit on a full pump rebuild later.

The first time my shim under the bolt wasn't long enough and I ran out of threads with the o-ring just barely visible. I put it all back and did it a second time with a longer shim; probably 9 mm long.

The o-ring I took out looked a little scuffed, but not torn. My drip was about every 2 seconds.

No more leak! Thanks Michael for the how-to.

Johann

hewittd · Post by **hewittd** » Mon Aug 10, 2009 6:41 pm

First, I want to say thanks so much to everyone that figured out how to do this and to those that were willing to try it first. I finally got around to doing this and it worked great. I did have one question though. I have a 79 rabbit and when I loosened the hydraulic pump there was no rubber o-ring installed. Is that weird? Also, was it bad that I installed one if it didnt have one? It fixed my drip but now I'm surprised I didn't have a flood coming out with no o-ring in there.

-Dylan

surfcam · Post by **surfcam** » Mon Aug 10, 2009 10:10 pm

There is equipment out there that was made to run without gasket's. Steam turbines and Ario motorcycles. Just machine and stone the surface it will seal. But it's not very forgiving. If the joints aren't sturdy enough they leak. The motorcycles leaked and the steam turbines don't.

Post by **Fatmobile** » Mon Aug 10, 2009 10:37 pm

Was there a groove to slide the seal into?

hewittd · Post by **hewittd** » Tue Aug 11, 2009 6:59 am

Not much of one if any. The hydraulic pump reinstalled pretty flush up against the injection pump body though. Will it hurt anything if I leave it in there?

Post by **Fatmobile** » Thu Aug 13, 2009 2:04 am

I can't believe there wasn't a seal.
Are you sure you pulled the head out far enough to see it?
It's not right up against the end, the groove the seal fits into goes down inside.
The seal doesn't smash up again the end. It slides down inside,.. seals against the inside edge of the pump body.

hewittd · Post by **hewittd** » Thu Aug 13, 2009 6:39 am

I backed the thing off almost an entire inch and still didn't see a seal.

odie · Post by **odie** » Thu Aug 13, 2009 12:09 pm

i just did mine and that groove is only like 1/8-1/4 inch below the head. is this a bosch or cav pump?

CoolAirVw · Post by **CoolAirVw** » Sat Oct 24, 2009 7:01 am

For those not ambitious enough to try the "In-Car Head 0-ring replacement", here's a link for "Out-of-car Head O-ring replacement".

http://www.eastment.net/Boschpump8.htm

Former VWDieselParts.com Forum

Injection pump leaking, any ideas?

Re: MY TURN!