Recent purchase volvo mc110b.Problem: At about 40 percent throttle misses or runs rough.below and above that range good power, machine has low hours,no white or black smoke when warmed up and engine temperature is normal,recently change fuel filter and new fuel , any thoughts on diagnosis? Thanks, Anthony K
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I would start there. It sounds like its not spooling up. If its not boosting, the injectors will still be squirting in the same amount of fuel but the cylinders don't have enough air to make it all burn causing black smoke.
I'd remove one of the hoses and feel that the turbine still spins freely and does not have any play. If it moves side to side or back and forth, your bearings are bad.
I will test the turbine as suggested,Thanks for the reply,
16 valve , direct injection , V-ACT Engines - Volvo Power
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Have it scoped out by your local dealer , I am thinking a sensor issue , maybe RPM /speed sensor or I wonder if you have a catalitic converter or yours , if so the oxygen sensor on it
No catalitic converter,limited knowledge of diesels,seems to be a simple engine with very limited electronics.Dealer is too far away and my pocketbook has informed me that I am pretty much a need to do it myself kind of guy..Dealer did suggest that many of the machines of that era came with porous fuel lines which would would not leak but suck air at certain speeds causing narrow band rough running,And they suggested,saying that I might laugh at them,but the first thing they do when they get those machines is too change out all fuel lines,will give that a try next..Commenting on a previous post.The turbine has an even drag all the way around,being all new to me, I assume the drag is oil resistance on the bearings.Thanks guys,look forward to your comments.
I have not had to deal with any problems with a V engine , luckily as I don't know alot about them yet , I think that if you reseach it you will find that if you do have the V- engine that is not as simple and electronic free as you think and as far as it's direct inject computor controll goes there isn't alot you can do yourself short of changing parts blindly , sounds like the dealer you went to doesn't know alot about them yet either
Sorry I was not clear in my description of the motor for the volvo mc110b, The motor is a four cylinder direct injection diesel with what I believe to be a mechanical injector pump.
