Symptoms of Injection pump failure? - PeachParts Mercedes-Benz Forum

crashone · #1 07-17-2007, 09:33 PM

How many of you have had an injection pump go out? What happened? What were the symptoms. This for the '83 300 SD 617.951 engine. Thanks.

#2 07-17-2007, 09:37 PM

They rarely fail except from poor/contaminated fuel or wear from lots of miles.

Alot of times is something simple like a bad injector, delivery valve, incorrect injection timing (worn chain), or other maintenance issues like skimping on the valve adjustment intervals.

crashone · #3 07-17-2007, 10:15 PM

That's good info, but how did it fail? Was there any warning, poor performance or did it just stop working? Did it mimick a bad fuel pump or would the car just run like like crap?

#4 07-17-2007, 10:28 PM

My IP didn't really fail, it just started to leak significantly (below the seals) and the car developed a rough idle. It had full power, even with the leak.

Tymbrymi · #5 07-17-2007, 11:14 PM

I had one that was bad when I bought the car... It was *always* very hard to start (and I live in the south!), ran rough the first few minutes, smoked (white smoke, aka unburned diesel) like mad from ~900-1400RPM, knocked like crazy at those same RPMs, and it always shook at idle. It did just fine when you got it out of those RPM ranges though!

I changed *everything*... new nozzles, glowplugs, checked the timing... etc. The only thing that fixed it was replacing the IP. I've done a little more reading on how IPs work lately... I still have no idea what was broken on the pump.