I've never done much around 855's... but as I understand it, there are timing marks on that drive and you ~should~ make an attempt to get things set correctly FOR ONE REASON. If some poor bugger has to go doing a tuneup on the overhead at some point in time... I believe he's gonna need those marks in the right place... or it will at least make his life easier. As far as running of the engine is concerned... No, the timing marks make no difference. The fuel pump is not timed and I don't beleive the air compressor needs timing either. Cummins PT fuel pumps are nothing more than a gear drive pressure pump that supplies pressure to the injectors. The injectors handle fuel timing on a Cummins... and metering is done by a controlled orifice in the injector and varied by the pressure supplied by the pump...
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Today's Featured Article - Stories From Old Farmer - by K. Pratt. Old Farmer, a.k.a. Dale Jensen began posting messages to our discussion forums at the grand age of 75. With extensive knowledge of farming and tractors, he valued the past and the ways that went with it. He shared these values with us until shortly before his passing. I spoke with Dale in his last days and requested his permission to share some of his stories with the readers of our magazine. He agreed, and provided the
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