FOR MODELS: JGW, JGR AND JGJ SECTION 6 - TECHNICAL ASSISTANCE
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Excessive Packing
Leakage
Worn packing rings.
Improper lube oil and or insufficient lube rate.
Dirt in packing.
Packing rings assembled incorrectly.
Improper ring side or end gap clearance.
Plugged packing vent system.
Scored, tapered or out of round piston rod.
Excessive piston rod run-out.
Packing not seated or properly run in.
Packing Over Heating
Lubrication failure.
Improper lube oil and/or insufficient lube rate.
Worn packing rings.
Dirt in packing.
Improper ring side or end gap clearance.
Scored, tapered or out of round piston rod.
Excessive piston rod runout.
Excessive Carbon on
Valves
Excessive lube oil.
Improper lube oil.
Oil carry-over from inlet system or previous stage.
Broken or leaking valves causing high temperature.
Excessive temperature due to high pressure ratio across cylinders.
Relief Valve Popping
Faulty relief valve.
Leaking suction valves or rings on next higher stage.
Obstruction, bind or valve closed in discharge line.
High Discharge
Temperature
Excessive ratio across cylinder due to leaking inlet valves or rings on next
higher stage.
Fouled intercooler piping.
Leaking discharge valves or piston rings.
High inlet temperature.
Improper lube oil and or lube rate.
Frame Knocks
Loose crosshead pin or pin caps.
Loose or worn main, crankpin or crosshead bearings.
Low oil pressure.
Cold oil.
Incorrect oil.
Knock is actually from cylinder end.
Low fluid level in damper.
Drive End of
Crankshaft Oil Leak
Clogged vent or vent piping.
Excessive cylinder packing leakage.
Piston Rod Oil Wiper
Leaks
Worn wiper rings.
Wipers incorrectly assembled.
Worn/scored rod.
Improper fit of rings to rod/side clearance.
Problem Possible Causes
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