Injection Pump Rebuild - PeachParts Mercedes-Benz Forum

Squiggle Dog · #1 08-09-2018, 01:30 AM

Well, I brought an injection pump from an OM603 to Southwest Diesel & Electrical in Phoenix and wanted them to hook it up onto their Bosch testing station (which they proudly advertise on their website as being one of the only shops left with the Bosch testing station) for a free diagnostic.

When I returned, the injection pump was in pieces in a box. I asked them why they took it apart, and they said it was bad. I asked them why it was bad, and the person at the counter said, "I don't know, it's just bad. That will be $100."

I asked why it was taken apart when I specifically wanted it put on the Bosch test station. Their answer was, "Oh, we got rid of that equipment a long time ago. We had to take it apart to see if it was good or bad." So, I had to pay $100 for a pump I brought in for someone else because I wanted to have it tested, and it came back totally useless.

Also, I had the injectors in my 300SD rebuilt there. As I recall, three of them leaked between the upper and lower halves, so they had to redo them. Then one of them still leaked and the technician told me that it was my hard lines or the rubber return hoses leaking, which I knew it wasn't.

I had to get pushy in order to get them to fix it. When they split the injector halves, I could see why it was leaking--there was a lot of scale they hadn't cleaned and the technician bead blasted if off. After that, it didn't leak.

I also didn't like the technician saying, "Pop pressures don't really matter on these old injectors." They also wanted about $70 each for heat shields that I can get online for $2 each. So, if you use them, don't let them take you for a sucker.

Mike D · #2 08-09-2018, 08:05 AM

Well shoot. Scratch off another rebuild shop. It's been quite awhile since I had some work done by them and it sounds as though their personnel and quality of their work has gone by the wayside. Sorry for the bad experience you got from them but thanks for the update.

mark82 · #3 08-09-2018, 09:10 AM

I think that is the shop that did the rebuild before I purchased the car. Didnt last very long. Poor running and oil migration into the fuel.

Lots of shops around will service injection pumps, cummins, stanadyne, cat etc. I dont really want billy-bob thinking they're all the same and disassembling mine. Prefer a shop that has a history of bosch/mercedes work.

Squiggle Dog · #4 08-09-2018, 11:10 AM

I think Southwest Diesel & Electrical quoted $2,000 to rebuild the six cylinder OM603 injection pump. I know they aren't cheap to rebuild anyway, but that's insane. Might as well send in the pump to Dieselmeken or Myna for that money.

One of the employees did have a nice 190D ponton in their shop, not that it means anything, but it was neat to look at.

These injection pumps should last hundreds of thousands of miles before having problems, so I imagine a failing pump would either be caused by a poor rebuild (maybe someone had it done as preventative maintenance), poor quality fuel (coagulated waste vegetable oil), lack of fuel filtration, or frequently running the tank empty.

What's also interesting is that I brought them in a set of injectors that I had removed from a wrecking yard car, which looked like they had been freshly rebuilt and they even had the little rubber bands with the painted numbers on them. When I had them tested, they said that they were bad. I asked how bad they were, and they just said that they were bad and couldn't tell me any more than that.

barry12345 · #5 08-09-2018, 11:38 AM

Quote:

Originally Posted by Squiggle Dog

Well, I brought an injection pump from an OM603 to Southwest Diesel & Electrical in Phoenix and wanted them to hook it up onto their Bosch testing station (which they proudly advertise on their website as being one of the only shops left with the Bosch testing station) for a free diagnostic.

When I returned, the injection pump was in pieces in a box. I asked them why they took it apart, and they said it was bad. I asked them why it was bad, and the person at the counter said, "I don't know, it's just bad. That will be $100."

I asked why it was taken apart when I specifically wanted it put on the Bosch test station. Their answer was, "Oh, we got rid of that equipment a long time ago. We had to take it apart to see if it was good or bad." So, I had to pay $100 for a pump I brought in for someone else because I wanted to have it tested, and it came back totally useless.

Also, I had the injectors in my 300SD rebuilt there. As I recall, three of them leaked between the upper and lower halves, so they had to redo them. Then one of them still leaked and the technician told me that it was my hard lines or the rubber return hoses leaking, which I knew it wasn't.

I had to get pushy in order to get them to fix it. When they split the injector halves, I could see why it was leaking--there was a lot of scale they hadn't cleaned and the technician bead blasted if off. After that, it didn't leak.

I also didn't like the technician saying, "Pop pressures don't really matter on these old injectors." They also wanted about $70 each for heat shields that I can get online for $2 each. So, if you use them, don't let them take you for a sucker.

Scammers in that situation. Or just brainless. Without the gear it would be impossible to recalibrate it after a rebuild. They would have known this. Why they even took it apart mystifies me.

Mentioned on this thread and something I will think about. Adding lubrication to the fuel is perhaps something we should really think about.

These old inline injection pumps are pretty durable. Unless abused in some way. At least up to the reasonable expected lifespan of these cars. Even then many if not most of these cars are not scrapped. For the pump being bad.