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2010 mp7 oil pressure problem


aw12345

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Almost all our Mack trucks with the mp7 engine seem to experience a low oil pressure problem when pulling long grades.

The engine warning light will come on and the pressure gauge will read low oil pressure and not long after the engines will shut down.

This only happens going up a long fairly steep grade, but numerous of our trucks do this.

The upgrade tomthe engines for the oil pump idler gear or what ever upgrade required the back of these engines to come apart has done.

Anybody can give me a cure for this problem. Not a good thing when a fully loaded truck goes up hill and the engine dies.

Thanks in advance

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Oil senders are good, All the trucks (about 20) have had all but the last update done to them.

This is not just one truck, almost any one of them, will do this when they drive it up this fairly steep 15 mile long hill climb

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Not that steep ,just a long constant grade on the highway. The grade is brutal on a hot summer day it's hard to keep count of all the cars and trucks that overheat on the side of the road. The main point is that just about any 2010-2011 Mack truck with a MP7 engine that goes over that grade comes up with this issue.

Also what is the oil pressure spec for these engines? And would high engine load, low RPM into high a gear and the resulting heat built up and then the piston cooling jets spraying more oil have something to do with it?

Edited by aw12345
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  • 2 weeks later...
  • 2 months later...
  • 3 months later...

I drive for UPS. All of our new Macks that are on runs over the Blue Ridge mountains do this. Compounding the problem is that UPS uses recycled oil in all the equipment!

When we write the tractors up for this issue the UPS mechanics tell us that there is no problem, they are OK to run, and that if we knew how to drive/downshift there wouldn't be an issue....

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  • 1 month later...

Theres a oil pipe that goes to the rocker shaft from the jake solenoid that provides oil pressure to the jakes theres a little purple oring on each end of it and if it gets torn or brittle from heat you will have low oil pressure on a long pull

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