Maintenance Manual of 4M11 Series Diesel Engine For Land Power Generators
26
3-1
Insufficient or excessive oil
Check the oil dipstick and add/drain engine oil as per
specification.
3-2 Internal blockage of oil cooler Clean or replace engine oil cooler
4 Coolant temperature too high
4-1 Insufficient coolant volume Replace oil pump
4-2 Insufficient displacement of water
pump
Check water pump impeller clearance and when necessary replace.
4-3 Insufficient fan speed Adjust fan belt tension.
4-4 Excessive water scale in cooling
system
Disassemble water scale.
4-5 Poor heat dissipation performance of
radiator
Disassemble dirt from radiator fins and improve ventilation
condition of water tank.
4-6 Failure (non-opened) of thermostat Check the cause and replace.
3.2.6 Abnormal Exhaust Gas Color of Diesel Engine
SN. Cause Troubleshooting
1 White Exhaust Gas
1-1 Poor atomization of fuel injector Check injection pressure and state of fuel injector.
1-2 Water in diesel Clean diesel tank and filter and replace diesel.
1-3
Insufficient compression pressure of cylinder
Check valves, cylinder gasket, and piston rings for cause
of leakage and solve the cause.
2 Blue Exhaust Gas
2-1 Over-high oil level in oil sump Drain excessive oil.
2-2 Wear or insufficient elasticity of piston rings
and permeation of oil
Check and replace piston rings.
2-3
Sealing failure of valves
Check sealing status of valves and replace valve stem
seals.
3 Black Exhaust Gas
3-1 Diesel engine overload Adjusted to the specified load
3-2 Poor fuel injection and atomization Check and repair or replace outlet valve of fuel injection
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