Injector Pump Rebuild
 

Help! My mech says I might need to have my injector pump rebuilt. (Major rough idle when warm) He says $1200-$1300!!!!!!!!!!!!!!! Ouch. Is this a non- DIY project? Has anyone ever had it done before and by who? I'm out in Southern California.

83 300SD 170K

You can't rebuild the pump yourself, but you should be able to buy a rebuilt one on exchange for about $900. I think this might be a DIY project, but I have personally never done this.

gawlbpd

Why not just get a used one at the pick and pull. They last a LONG time. I have seen them on eBay too. I would question your need for a new pump, get another opinion from a qualified MB mechanic to be sure. Good luck

Definitely get a second, or third, opinion. It may just need delivery valve seals, or rebuilt injectors. Pretty rare to need a new pump. The R&R is a BIG job to DIY but can be done if you have time. But no you cannot rebuild it yourself unless you have a $20k Bosch test bench and access to Bosch parts.

Rusty (800-741-5252, rusty@mbz.org) is having a super sale on rebuilt 5-cyl injection pumps through the end of March, I think $550 with exchange?? But check out the other possibilites first. Usual problem with "bad" pumps is no power and/or terrible MPG, not rough idle.


HTH,

There is no way you can rebuild an injection pump (IP) your self. It must be put on an IP test stand to be calibrated. Only a Diesel injection shop will have a test stand.

Have you tried to adjust or replace the rack screw in the IP? This will usually cure rough idle. I agree that if the car runs good other than rough idle, the IP is OK.

P E H

Rough idle you say..

I thought that could be a rack-dampener screw. As far as rebuilt units-price varies greatly. If Rusty can get you a IP for $550, then so can Fastlane. They both use Worldpac which is the wholesale parts distributor.
For the rack dampener, do some searching on the list. There was an updated screw- they are painted different colors. Make sure you have the new one.

Michael