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  #1  
Old 11-19-2012, 05:39 PM
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Confirmed injection pump failure ???

If you have ever had a confirmed Mercedes injection pump failure??

Please give a brief description or drop a link to your thread..


Thank you.

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  #2  
Old 11-20-2012, 02:25 PM
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Quote:
Originally Posted by whunter View Post
If you have ever had a confirmed Mercedes injection pump failure??

Please give a brief description or drop a link to your thread..


Thank you.
Define "pump failure",..... I would assume" a failure to operate (deliver fuel properly), having been operated in ideal conditions, Dino diesel, no water, always oiled properly, proper filtration always used."

Or do you mean "any" failure mode, (regardless of fuel used (veggie & god knows what), questionable filtration servicing, water contamination, lack of oil?
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  #3  
Old 11-20-2012, 02:37 PM
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I think that Roy is asking for information regarding ANY type of failure of an IP regardless whether it was mechanical or fuel flow.

Now that these cars are getting some years on them, the failure patterns seem to change, or maybe not change, but some never before seen failures add to the ones we've seen all along.
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  #4  
Old 11-20-2012, 02:59 PM
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I think he is looking for internal "mechanical" failures...and probably not lift pump or vacuum shut off or other "external" bolt on parts....

BTW, I would call the lift pump and shut off "bolt on" in this particular case.
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  #5  
Old 11-20-2012, 03:14 PM
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I've been monitoring MB diesel discussion boards and multiple enthusiast sites for about a decade now, and I've seen possibly one pic of an M-pump that grenaded internally and a whole bunch of cases where some guy's hapless mechanic didn't know what else to do and swapped a pump. These things are super robust, and can typically last the life of an engine. The most common issue I've seen is that on the M-pumps, the linkage for the fuel shutoff gets hinky and fouls with the rack position enough to impact performance. The other scarlet letter should get assigned to the Rhodes Scholars who pull the side covers off and mess with the individual element rack positions or dive into the governors with little or no info. I have just such a letter for diddling with the latter.

I'm highly skeptical whenever I hear that an MB injection is the source of an issue. It's always possible, but not always probable
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  #6  
Old 11-20-2012, 03:47 PM
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A year ago on my 1983 300SD with 345000 miles on it, I had the injection pump replaced with a used one. It works perfectly now. The original pump was not torn apart to see what the problem was for sure. The engine speed would not increase even with no load until 3/4 of the way to the full speed stop. The max no load speed was about 3500 rpm. It would start and run well. The lift pump pressure was checked and found to be OK. My thought is that some part of the governor section became worn and no longer operated the rack properly.
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  #7  
Old 11-20-2012, 03:55 PM
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Mine failed do to user error. I replaced the Orings and crush washers under the delivery valve holders, and when I went to torque everything down to 25 FT/LB, I had never used that low of a torque setting with a click type torque wrench, I snapped every single one, and even broke one off into the pump.
I ended up using an easy out to remove the threads broken off out of cyl 5 gallery. After that I put everything back together with new delivery valve holders and washers and the car ran. But then when I revved it a bit it took off, but I was able to shut it down before any damage.
I had tons of fuel in my sump now. I drained the oil and put in fresh oil then started it up. Now it idled like crap but it never took off again. So I drove it around thinking I had washed the cylinder walls and unseated the rings. It drove fine, but just idled like crap. So I took it all apart again..

I then removed all of the delivery valves, got a magnet and began pulling the barrels out to see if they were misaligned with the pins. I got all of them out but #5, the one I broke the thread off into. It eventually came loose, but could not lift more than a half inch out of the fuel gallery below the threads. I tried everything, even putting a coat hanger into the fuel spillover hole in the side of the barrel to lift it but It wont come all the way out. So I PB blast everything put it all back together with new washers again and started it up. It ran Well and warmed up. I then gave it a tiny rev and it took off again, and I shut it off before it could do damage. I checked the dipstick and it was over filled with diesel again. So I drained it and put more in and started it up. It idled like crap again.
SOOO I need to pull the pump out. Either when torquing it down I cracked the housing and the barrel sits lower now advancing fuel, or there is an aluminum piece of threading jammed against the side of the barrel in the fuel gallery causing the barrel to torque unevenly...

Either way my fault not Bosch.
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  #8  
Old 11-20-2012, 03:56 PM
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Quote:
Originally Posted by gjgogel View Post
A year ago on my 1983 300SD with 345000 miles on it, I had the injection pump replaced with a used one. It works perfectly now. The original pump was not torn apart to see what the problem was for sure. The engine speed would not increase even with no load until 3/4 of the way to the full speed stop. The max no load speed was about 3500 rpm. It would start and run well. The lift pump pressure was checked and found to be OK. My thought is that some part of the governor section became worn and no longer operated the rack properly.
Sounds like a tight rack
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  #9  
Old 11-20-2012, 04:48 PM
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Quote:
Originally Posted by Proctor750 View Post
Mine failed do to user error. I replaced the O-rings and crush washers under the delivery valve holders, and when I went to torque everything down to 25 FT/LB, I had never used that low of a torque setting with a click type torque wrench, I snapped every single one, and even broke one off into the pump.
I ended up using an easy out to remove the threads broken off out of cylinder 5 gallery. After that I put everything back together with new delivery valve holders and washers and the car ran. But then when I revved it a bit it took off, but I was able to shut it down before any damage.
I had tons of fuel in my sump now. I drained the oil and put in fresh oil then started it up. Now it idled like crap but it never took off again. So I drove it around thinking I had washed the cylinder walls and unseated the rings. It drove fine, but just idled like crap. So I took it all apart again..

I then removed all of the delivery valves, got a magnet and began pulling the barrels out to see if they were misaligned with the pins. I got all of them out but #5, the one I broke the thread off into. It eventually came loose, but could not lift more than a half inch out of the fuel gallery below the threads. I tried everything, even putting a coat hanger into the fuel spillover hole in the side of the barrel to lift it but It wont come all the way out. So I PB blast everything put it all back together with new washers again and started it up. It ran Well and warmed up. I then gave it a tiny rev and it took off again, and I shut it off before it could do damage. I checked the dipstick and it was over filled with diesel again. So I drained it and put more in and started it up. It idled like crap again.
SOOO I need to pull the pump out. Either when torquing it down I cracked the housing and the barrel sits lower now advancing fuel, or there is an aluminum piece of threading jammed against the side of the barrel in the fuel gallery causing the barrel to torque unevenly...

Either way my fault not Bosch.




No tight rack here..














#4 barrel comes out but not #5....

















#4 barrel.. hmm is that a casting mark???






















Marked to clock it correctly












The source of all of my problems..









.

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Last edited by whunter; 11-22-2012 at 04:05 AM. Reason: turned on signature
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