Author Topic: Worth it to change a few seals on Injection Pump? (Read 4322 times)

wikdslo · « **on:** September 04, 2007, 06:08:00 am »

So I have put on my second injection pump only to find out it is also leaking, seemingly from the same spot as the first one (choke cable assembly).

I have researched the option of having Giles (Performance Diesel Injection) rebuild a pump, and the prices go from $350 to $650 depending on how I go about it.

My concern is in the fact that the car is not really worth much money other than what I put into it in new parts. That aside, I also have a rebuild kit for the pump with the parts necessary to change most of the seals.

Now, is it worth it to just change the known leaky seal and try swapping that onto my car and hope for the best? Or should I try rebuilding most/all of the seals?

Or should I bite the bullet and get a fully rebuilt pump?

myke_w · « **Reply #1 on:** September 04, 2007, 07:39:04 am »

The seal that is leaking on your pump is easy to fix, there is a how to somewhere on there that tells you how..

wikdslo · « **Reply #2 on:** September 04, 2007, 08:10:47 am »

Quote from: "libbybapa"

If the shaft is fairly tight still, then it is worth resealing. If the shaft bushings are quite floppy, then rebuilding is advised.

Andrew

Do mean the shaft for the choke or the shaft going to the gear for the timing belt?

burn_your_money took a look at it and installed this pump, so I'm guessing he would have noticed if something was wrong like that.

Op-Ivy · « **Reply #3 on:** September 04, 2007, 11:39:59 am »

Andrew means the shaft that the gear sits on. There are two identical bushings that the shaft runs on. Eventually they wear and cause the shaft to have play in it.

If there is very little play(can't remember what specs are.... Maybe .006 of an inch?) then you could just replace the seal that is leaking. Otherwise you should replace the seal, bushings and while you're at it, any other seal in the pump while it's open.

That's what I did

Matt

wikdslo · « **Reply #4 on:** September 04, 2007, 12:25:55 pm »

Quote from: "Op-Ivy"

Andrew means the shaft that the gear sits on. There are two identical bushings that the shaft runs on. Eventually they wear and cause the shaft to have play in it.

If there is very little play(can't remember what specs are.... Maybe .006 of an inch?) then you could just replace the seal that is leaking. Otherwise you should replace the seal, bushings and while you're at it, any other seal in the pump while it's open.

That's what I did

Any feedback on how well the self rebuilt pump worked out?

Matt

Op-Ivy · « **Reply #5 on:** September 04, 2007, 12:46:29 pm »

Quote from: "wikdslo"

Any feedback on how well the self rebuilt pump worked out?

[/quote]

It worked very well! No leaks or shaft play now. It is definitely a learning experiance. I would recommend anyone who wants to learn more about their diesel to rebuild/reseal their pump. Many people on the forums here have also done this successfully.

If you are interested in getting more information about this. Try a search of the forums. As well, check out the pictures I took while taking the IP apart

http://s96.photobucket.com/albums/l163/Op-Ivy/Injection%20Pump%20Rebuild

Matt

wikdslo · « **Reply #6 on:** September 04, 2007, 12:53:27 pm »

Quote from: "Op-Ivy"

It worked very well! No leaks or shaft play now. It is definitely a learning experiance. I would recommend anyone who wants to learn more about their diesel to rebuild/reseal their pump. Many people on the forums here have also done this successfully.

If you are interested in getting more information about this. Try a search of the forums. As well, check out the pictures I took while taking the IP apart

http://s96.photobucket.com/albums/l163/Op-Ivy/Injection%20Pump%20Rebuild

Matt

Sounds good. I think for simplicities sake, I am going to take the 1 pump and just replace the 1 seal for now, and see how that goes. I'll check for shaft play, but the pump supposedly has less than 50k on it.

And then I will work to rebuild the entire other pump. I know both work, they just both leak out of the same spot.

As for searching I did do that and found a write up by libbypapa but it was for a TD pump, which was slightly different. Any non TD writeups?

Thanks!

Op-Ivy · « **Reply #7 on:** September 05, 2007, 12:54:08 pm »

I am pretty sure the only difference between a TD and NA pump is the LDA. It increases fueling as the boost pressure increases. The LDA is the "spaceship" looking thing on top.

As for the NA rebuild.....

http://www.vwdieselparts.com/forum/viewtopic.php?t=6694

Matt

rallydiesel · « **Reply #8 on:** September 05, 2007, 01:30:48 pm »

Is there a bushing on the mainshaft that can be replaced? Or do you have to have it drilled out and a bushing put in? Is this something a DIYer could do? My pump is leaking at the main seal, but only when there is no tension on the pulley, with the timing belt on it doesn't leak but I would like to fix it if I can.

Op-Ivy · « **Reply #9 on:** September 05, 2007, 03:00:40 pm »

The bushing on the mainshaft has to be pushed out and the new one pushed in. Its a tight fit. As well you have to "ream" the bushing open from the inside because it comes at a set size to compensate for wear on the shaft.

It can be "DIYed" pressed in and out fairly easily.

As for opening it up..... You would have to buy a reamer set or a speific one. My reamer set was around $80 and is shown in the picture link I posted above (The orange box). Otherwise you could get a machine shop to open it up. I have no clue how much that would cost.

Matt