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OM605 running rough
Petar Offline
7.5mm M pump
****


Posts: 392
Joined: Feb 2014
Location: Serbia
#1
OM605 running rough
So I have a '96 c250 with a mechanical pump from om602 non turbo.Besides from low power(the pump only fuels for a NA OM602 so i have like 90-100hp) it was running ok. Last year i noticed a slight clicking from the engine, sounded like it's coming from the head. Recently it started running rough, especially when cold but it starts ok. It will run rough until it warms up then it sounds like it has a bad injector. I can hear a chuffing sound from the intake manifold and my guess is that i'm loosing compression through the intake valve. I haven't yet taken off the manifold to check. What could the reason be ? Bad lifter ? Burnt valve ??

Oh and I'm also loosing coolant. It started with 1 liter every year and now I'm loosing 1 liter in about 2 months. No obvious leaks. Could this be related somehow ? Bad head gasket due to overheating ??
(This post was last modified: 01-07-2018, 05:13 AM by Petar.)
01-07-2018, 05:08 AM
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addi.bigg Offline
OM605 200HP........
**


Posts: 85
Joined: Aug 2016
Location: Hungary
#2
RE: OM605 running rough
(01-07-2018, 05:08 AM)Petar Wrote: So I have a '96 c250 with a mechanical pump from om602 non turbo.Besides from low power(the pump only fuels for a NA OM602 so i have like 90-100hp) it was running ok. Last year i noticed a slight clicking from the engine, sounded like it's coming from the head. Recently it started running rough, especially when cold but it starts ok. It will run rough until it warms up then it sounds like it has a bad injector. I can hear a chuffing sound from the intake manifold and my guess is that i'm loosing compression through the intake valve. I haven't yet taken off the manifold to check. What could the reason be ? Bad lifter ? Burnt valve ??

Oh and I'm also loosing coolant. It started with 1 liter every year and now I'm loosing 1 liter in about 2 months. No obvious leaks. Could this be related somehow ? Bad head gasket due to overheating ??

Do you have video of the rough running?
01-07-2018, 11:50 AM
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Petar Offline
7.5mm M pump
****


Posts: 392
Joined: Feb 2014
Location: Serbia
#3
RE: OM605 running rough
Yes

warmed up:
https://www.youtube.com/watch?v=nOhwkhPcUHk
The chuffing is louder on video than it really is.

cold start:
https://www.youtube.com/watch?v=ryv5pOgGUPw
Misfires like a bad glowplug but it does this for much longer, only when it warms past 50-60*C it will stop
I do have one bad glow plug but that had been like it since last year, and it would only misfire for about a minute after a cold start.
(This post was last modified: 01-11-2018, 12:49 PM by Petar.)
01-11-2018, 12:48 PM
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