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Low compression pressure and high exhaust temperature Low firing pressure and high exhaust temperature Low compression pressure and low exhaust temperature Low firing pressure and low exhaust temperature
improperly seating intake valves leaking cylinder liner seal rings late fuel injection timing carbon deposits on the piston
（1） and （2） （1） only （2） only （1）, （2） and （3）
high compression pressure low intake air temperature low exhaust pressure high scavenge air pressure
early fuel injection timing leaking valves a continuously open scavenge air port low cooling water temperature
low exhaust back pressure early fuel injection in one of the cylinders compression pressure in one of the cylinders plugged injector holes
clogged air filter compression stroke burned exhaust valves all of the above
engine overload low combustion temperature plugged fuel nozzle holes excessive compression pressure
worn or broken cylinder liner sealing rings high cooling water temperature worn or broken piston rings low fuel oil pressure
low air charge temperature high cranking speed excessive fuel dilution of lube oil high compression pressure
compressor/condenser condenser/evaporator throttle valve/evaporator evaporator/condenser
low compression pressure increased piston wear increased cylinder lube oil consumption poor contact between compression rings and liner
high compression pressure low intake air temperature low exhaust pressure high scavenge air temperature
fuel knock increased power low compression pressure high exhaust temperature
clogged coolant passages a leaking cylinder head gasket low fuel oil pressure worn or broken cylinder liner sealing rings
compression must be low for effective spark ignition compression must be low for required horsepower and torque generation compression must be low to prevent pre-ignition compression must be low to have effective pre-ignition
insufficient fuel supply due to fuel pump valves sticking or leaking excessive mechanical clearance between the piston crown and cylinder head excessively worn fuel pump plunger excessive exhaust back pressure
a high exhaust temperature a high smoky exhaust a high output a high compression
Loss of engine power and high exhaust temperatures Higher than normal firing pressure and low exhaust temperatures High fuel consumption and high exhaust temperatures Lower than normal compression pressure and high exhaust temperature
low compression temperature low ambient air pressure high lube oil pump pressure high fuel oil booster pump pressure
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