Engine Hours Conversion

[Kyle Dixon]

I'm in the beginning stages of pulling some data together for a small research project for my organization regarding the rate engine hours are accrued compared to actual miles driven. The  intention is to analyze the data to see if the preventative maintenance program needs to be adjusted to meet the demand placed on the fleet of ambulances. I'm seeking some guidance and answers from everybody.....

Is there a formula to to convert engine hours to miles? A mechanic at our local Ford dealership reports Ford suggests the multiplier for engine hours to actual miles is 33.  A mechanic at our Freightliner dealership tells me to take the miles per hour the ambulance is traveling at 1200 RPM (Our high-idle engine speed setting) and use that as the multiplier for engine hours. Then subtract the actual miles on the odometer from the hours conversion to get an accurate number of miles. Is this correct?  Is there an industry standard?

How many of you use engine hours instead of engine miles to calculate when preventative maintenance is needed? (Oil Changes, Fuel Filters, Air Filters, Belts, Etc...)

Kyle Dixon, BAS, EMT-P, Fleet Coordinator

Adams County Ambulance & EMS

507 Vermont Street

Quincy, Illinois 62301

C:217-257-7879

[S Rowland]

Late to answer this- was not sure this group was still going on but I will give my opinion.  Forget the hour meter.  I ran my fleet for years based on the severe duty schedule- and along came the Chevrolet with the oil change calculator built into the software and the result is that I am running 10K oil changes max or less if the meter says so- the least the PCM gave me was around 8K miles- and it takes into account hours- so I think that 33-1 idea is bunk.  I run a solid 5K change on my Ford 6.0 and 7.3 units- prolly overkill on the 7.3, 10K on the sprinters- using of course the 12.99 a quart MB spec oil and tiny filter.  From my research- and including oil analysis results I would not be scared to run all of mine at 7500-10K intervals with good oil.  The only motors that ever come apart are the 6.0- and I have had the same failures on all of them- regardless of mileage- lifter failure followed by oil pump ingestion of the remains.  Oil changes cannot fix design problems.  Sounds simple but the factory severe schedule I think is overkill.  Might depend on your operation- mine run daily- about 4K a month, 24hr units run about 7K a month and despite my pleading and policy they let them idle all night.  Have a lot of 6.0's pushing 400K- how does that scare you?

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