Operation & Maintenance Manual for WP7 Euro
Ⅵ
Vehicle Diesel Engine
16
3.9 High temperature of cooling water
Causes
Troubleshooting
1. Low water level in water tank
Check if there is any leakage and add water
2. The water tank is blocked
Check the water tank to clean or repair
3. The water pump belt is loose
Tighten the belt as specified
4. Water pump gasket is damaged and
the pump impeller is worn
Check and repair or replace
5. The thermostat failure
Replace
6. The water pipe is broken and air
comes into the pipe
Check the water pipe, joints, gaskets, etc;
replace the damaged ones
7. Low oil level in the oil sump or lack
of oil
Check the oil level and leakage; repair and add
oil
3.10
Early wearing of parts
Causes
Troubleshooting
1. Unqualified or damaged air filter
element
Check, replace with a qualified element
2. Short-circuit of the air inlet system
Check the air inlet pipe, gasket,
connecting sleeve, repair or replace
3. Low oil level in the sump or lack of oil
Check the oil level and leakage; repair and
add oil
4. Oil passage is blocked
Remove blockage in the oil passage
5. Unqualified oil grade
Change the oil as specified
6. Piston ring is broken or worn
Replace the damaged parts
7. Cylinder liner or piston is worn or
scuffing
Disassemble the piston and cylinder liner,
repair or replace;
8. Oil filter element is not replaced in time Replace as required
9. Excessive wear of parts, requiring
overhaul
Check the mileage and determine to carry out
overhaul
10. The crankshaft is not coaxial with the
main shaft of driven parts
Check the mounting bracket, and repair if
necessary
11. Unqualified oil
Adopt oil of right grade
