Maintenance Manual of 4M11 Series Diesel Engine For Land Power Generators
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pump and fuel injectors.
3-3 Late fuel supply timing and serious
after-combustion
Adjust fuel supply advance angle
3-4 Incorrect valve clearance or poor sealing
status of valve
Check valve clearance and valve airtightness.
3-5 Blockage of air filter Clean air filter element
3-6 Poor fuel quality Replace high quality fuel
3.2.7 Diesel Automatic Parking
SN. Cause Troubleshooting
1 No rotation of crankshaft after stop
1-1 Seizure between crankshaft and bushing Overhaul and replace parts
1-2 Seizure between piston and cylinder sleeve Check and replace piston, piston ring, and cylinder sleeve.
2 Easy rotation of crankshaft after stop
2-1 Air content in fuel system. Bleed air and check pipeline airtightness.
2-2 Blockage of fuel system Clean and replace fuel filter element
2-3 Seizure of fuel injection pump rack or plunger Overhaul fuel injection pump
2-4 Blockage of intake pipe or air filter Check and clean air filter
2-5 Diesel runs out Add diesel
3.2.8 Abnormal Sound during Running of Diesel Engine
SN. Cause Troubleshooting
1 Rhythmic clear sound within cylinder due to earlier fuel injection
timing
Check and adjust injection time
2 Low unclear knocking sound within cylinder due to later fuel
supply timing
Check and adjust injection time
3 Excessive clearance between valve and rocker and metallic
knocking sound within valve mechanism
Check and adjust the valve
clearances
4
Excessive clearance between piston and cylinder
Check cylinder clearance and replace
piston or cylinder sleeve.
5 Excessive clearance between piston pin and connecting rod small Replace connecting rod bushing and
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