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initial checks for a hot bearing or oiling issues i usually only go 5 to 10 minutes, for final clearance and alignments have to be done when driver and compressor is all up to operating temperatures for the oil and coolant

have you checked to see if your coalescor has a hole in it allowing the oil to carry over, also check to see if the return line is open that takes oil from the filter housing back to the compressor inlet

had a simialr experience repairing a clients machine that had failed, the lube line to the bearings inside frame was cracked and starved the crank for oil

replace cylinder check valve, also check lubrication holes in cylinder they might have a build up or partial blockage from metal,scale,foreign material that is restricting flow.

has pressures changed at all?

i have seen many failures of the gasket on small air cooled compressors all were from heat

http://www.petroassist.com/Tech%20Know/techknow.asp

rings and rider bands good, is there enough gas flow thru the cylinder to keep piton centered in bore?

there is a liquid treatment available also called cansweet, i think it would also require gas removed from oil

has your purge pressure gone up and amount of purge gas used gone down, if so could be an indication of packing leakage into and pressuring up the distance piece allowing gas to get into crankcase and contaminate oil in the case

packing glands are wore and piston rod also what type of purge gas is run thru packing gland/distance piece

blowdown to upstream of suction control valve thru a small port valve, if bypass left open the unit will equalize, can be set to reclose at set pressure for strartup

detonation is your first indication, shown on panel/ecu or you can even hear it at times, these spikes in cylinder pressure and over temp of cylinder cause the damage

check supply voltage to sensors

have used some 2 stage leroi flooded screws with success in the past

rule of thumb i was always told was 2 psi per 100 rpm

most compressor apps run oil from the connecting rod thru the crosshead pin then up/down to the shoe, each shoe has oiling grooves that disperse oil across it top and bottom. the only splash lube engine i have experience with is ajax.

power ignition in calgary sells a explosion proof generator and 24 volt power supply kit and related altronic equipment to meet the classification proper installation will also be needed to meet spec's

brand type specs of oil in use?? might not be correct for application

also talk to startec when you are in calgary, they specialize in refrig and are a good company to do business with