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+--- Thread: engine stumble at 2700 RPM (/showthread.php?tid=6124)
engine stumble at 2700 RPM - Torkey - 01-10-2015
I'm having an issue with the engine stumbling when at 2700 RPM. Seems to run fine at faster and slower RPMs. When the engine stumbles there is a puff of white smoke that comes out of the tailpipe which smells like fuel and not oil.
I've checked all of the injectors and the spray pattern is good and the pop pressure is balanced.
I've also checked the cylinder compression and they are all at 405 psi +/- 10psi.
I'm wondering if this might be a problem with the injection pump but really don't know what else to check at this point.
RE: engine stumble at 2700 RPM - F.R.A.S - 01-10-2015
It's the om617 we're talking about right? Mr Dieselmeken have to correct me if wrong but I believe that if a plunger (pump element) is worn in a place this can happen. 2700rpm might be an area where the plunger gets most worn (highway speed maybe, without knowing your gearing).
RE: engine stumble at 2700 RPM - Torkey - 01-10-2015
(01-10-2015, 02:40 PM)F.R.A.S It's the om617 we're talking about right? Mr Dieselmeken have to correct me if wrong but I believe that if a plunger (pump element) is worn in a place this can happen. 2700rpm might be an area where the plunger gets most worn (highway speed maybe, without knowing your gearing).
It is an OM617 engine. Is it possible to replace the plungers without having to pull the IP to have it put on a calibration machine? I've got 3 of these pumps laying around. I could try swapping out the plungers to see if it helps. That is assuming there is little risk in doing it.
RE: engine stumble at 2700 RPM - [486] - 01-11-2015
pump's gotta be completely disassembled to swap elements
RE: engine stumble at 2700 RPM - Volker407 - 01-11-2015
(01-10-2015, 01:32 PM)Torkey I'm having an issue with the engine stumbling when at 2700 RPM. Seems to run fine at faster and slower RPMs. When the engine stumbles there is a puff of white smoke that comes out of the tailpipe which smells like fuel and not oil.
....
I'm wondering if this might be a problem with the injection pump but really don't know what else to check at this point.
I also could imagine the pump governor to be stuck at 2700rpm for some reason.
Did you change governor settings?
Try to drain the oil / rinse the governor housing of the pump to get the dirt out.
Check timing chain guides and chain tensioner. Maybe something is worn (mileage?) and the timing chain is in resonance at 2700rpm, swinging around and messing up your timing.
You can also try to turn the pump completely towards engine block (=earlier injection) to see if it happens earlier or later then.
Try to drive one fuel tank with 10% 2stroke oil
or 30% refined rapeseed oil (not cold-pressed!) added to your diesel tank.
If that mixture changes behavior something with direct contact to fuel has a problem.
Always test one change at a time.
Gruß
Volker
RE: engine stumble at 2700 RPM - Petar - 01-11-2015
(01-10-2015, 02:44 PM)Torkey(01-10-2015, 02:40 PM)F.R.A.S It's the om617 we're talking about right? Mr Dieselmeken have to correct me if wrong but I believe that if a plunger (pump element) is worn in a place this can happen. 2700rpm might be an area where the plunger gets most worn (highway speed maybe, without knowing your gearing).
It is an OM617 engine. Is it possible to replace the plungers without having to pull the IP to have it put on a calibration machine? I've got 3 of these pumps laying around. I could try swapping out the plungers to see if it helps. That is assuming there is little risk in doing it.
Why don't you try swapping the pump with a spare one ??
RE: engine stumble at 2700 RPM - Torkey - 02-11-2015
Finally got around to swapping the IP. The stumble is gone. Thanks again to OM616 for his awesome write up on IP adjustments.