I was searching for improved fuel milage. They asked; Have you ever ran the overhead, that'll help ya know. Ran the overhead in May. Milage has dropped from about 5.25 mpg to about 4.50mpg. I'm even trying to be patient but I don't understand "running the overhead'. I had the overhead ran on my old cabover a few years back with the same result. It dropped from about 4.75mpg to a flat 4.00mpg. SO WHATS THE DEAL !!!!
Run the overhead .... they said !
Discussion in 'Ask An Owner Operator' started by LittleMissCabover, Aug 19, 2014.
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Very simple, they did it wrong. Either to little clearance or to much. Running the over head, also called running the rack, on today's engines is just setting the valve lash, jake brakes, and fuel injectors. Very easy to do, but most shops never get it right simply cause they rush it, or get it"close enough". Take it back to them and tell them to do it again, on their dime, and do it right. Or take it to another shop.
Last edited: Aug 19, 2014
LittleMissCabover and Cetane+ Thank this. -
What Spider said, Your mpg's should never be worse after an overhead unless it was done wrong. At the very least I would want the last shop to check it, make sure you get a Sr mechanic and not the pimple head trainee
LittleMissCabover Thanks this. -
If you have a mechanical cat or mechanical cummins the fuel mileage will drop just about everytime after an overhead. The problem usually is most dramatic when you have neglected it and let everything run loose for way too long...good for mileage bad for dropping a valve. I see it all the time, don't be too excited give it 10,000 miles it will come back. If it's electronic, they probably mismeasured the injector height.
LittleMissCabover Thanks this. -
Had the overhead run on my 14L 60 series about 3 months ago, and fuel mileage stayed the same (about 5.5mpg), but it went from burning a gallon of oil every 10,000 miles to burning 4 gallons of oil every 10,000 miles.
10 weeks, a CAC, radiator, 2/32" off the drives, and a water pump later, mpg jumped up to 6.4mpg, but it's still burning that oil.LittleMissCabover Thanks this. -
LittleMissCabover Thanks this.
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Loadassisen and LittleMissCabover Thank this.
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"semi" retired and LittleMissCabover Thank this.
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