This is the part three of Shangchai W series engine troubleshooting guidelines. In this part, we will learn the the features, possible causes and corrections of oil temperature and consumption too high, coolant in oil, coolant temperature too high, coolant temperature too low and oil in coolant.
Fault Feature |
Possible Cause |
Correction |
The reading of oil temperature gauge exceeds the defined value, and still be after the enhancement of cooling. Meanwhile, there is black smoke from the exhaust pipe.
|
(1) overload of the engine.
(2) The reading of the thermometer is incorrect.
(3) Oil level is too low or too high.
(4) Insufficient cooling water or fan wind flow.
(5) Block of the oil cooler.
|
Decrease load.
Regulate the thermometer and replace it when required.
Add lube oil to the defined level.
Pay attention to keep smooth flow of coolant and regulate the belt tension to reach the defined speed of the water pump and fan.
Clean the oil cooler.
|
The oil level decreases rapidly, and the oil color is black. There is white smoke at the oil filter port and ventilation pipe, and blue smoke from the exhaust pipe.
|
(1) Low-load running for a ling time.
(2) The specification of used long oil is not correct.
(3) The failure of the elastic seal of the turbocharger.
(4) The oil return hole of the piston oil ring is block by carbon deposit.
(5) The seizure or serious wear of the piston ring(s) or/and over wear of cylinder liner leads to oil into combustion chamber and the combustion gas into the crankshaft case.
(6) Wear of valve guide(s.)
|
Enhance load to a proper degree.
Choose oil according to the defined specification in this manual.
Let a professional serviceman repair the turbocharger. Make replacement if necessary.
Clean off the carbon deposit and replace the oil ring(s) if necessary.
Replace the piston ring(s), and replace the cylinder liner(s) if necessary.
|
Fault Features |
Possible Cause |
Correction
|
There is yellow bubble in oil, and coolant steam condenses on the surface of the crankcase ventilation pipe.
|
Coolant leak due to the damage of the cylinder liner seals. |
Change the liner seals. |
Coolant leak at the contacting planes of the cylinder line and cylinder block.
|
Check the contacting planes for flatness and the gasket for damage, and make replacement if necessary.
| |
Coolant leak due to cavitation in the cylinder liner.
| Change the liner | |
Coolant leak due to the damage of the cylinder head gasket.
|
Change the head gasket.
| |
Mixture of oil and coolant due to the damage of the oil cooler core.
|
Check the cooler core and replace it if necessary.
| |
Coolant into the oil pan: (1) Coolant leak at the water pump shaft seal ring. (2) Damage of the water seal ring of the water pump.
|
Check the water pump, and replace the water pump if necessary.
Replace the water pump.
| |
Coolant leak due to the cylinder block cavitation (especially at the side of the push rods.）
|
Change the cylinder block. |
Fault feature |
Possible cause |
Correction
|
There is no or less coolant from the engine, and coolant temperature increase continually after the engine has started up.
|
There is air in the cooling system.
|
Loosen the air bleed joint on the water pipe, discharge the air until the smooth flow of the outlet coolant, and tighten all joints of the water pipeline.
|
The temperature of the coolant is too high under high-load and the oil temperature also increases.
|
(1) The speed of the water pump or fan cannot reach the defined value.
(2) Not enough coolant in the cooling system.
(3) Malfunction of the pressure cap of the radiator.
(4) Block of the water pipeline.
(5) There are too many scale on the surface of the radiator, which affects the performance of the radiator.
(6) Incorrect water temperature gauge.
(7) Failure of thermostat.
(8) The clearance between the impeller and housing of the water pump is too large.
(9) The water crack at the shoulder of the cylinder line(s).
|
Adjust the belt tension to the defined value.
Add coolant to the defined level.
Check the pressure cap for function and replace it if required.
Remove the scale deposit and wash the radiator.
Check the water temperature gauge, and replace it if necessary.
Check whether the opening and close temperatures of the thermostat are correct, and replace the thermostat if necessary.
Replace the water pump.
Replace the water pump.
|
The coolant in radiator is bubbling.
|
There is crack at the shoulder of the cylinder line(s).
|
Replace the cylinder liner(s) |
Fault feature |
Possible cause |
Correction
|
Low ambient temperature, low load.
|
Increase load to a proper degree.
| |
The thermostat does not work well or was damaged.
|
Regular or replace the thermometer when required.
|
Fault feature
|
Possible cause |
Correction |
Damage of the oil cooler core |
Replace the oil cooler core.
| |
Fault of the cylinder head gasket.
|
Replace the gasket. |
For other troubles like Engine will not start, Engine power output low, Abnormal noise and vibration, Abnormal-smoke, Abnormal oil pressure, Oil temperature and consumption too high and Coolant in lube oil, pelase visit the below troubleshooting guidelines:
Shangchai W Series Engine Troubleshooting Guidelines
Shangchai W Series Engine Troubleshooting Guidelines II
Copyright © Guangxi Dingbo Generator Set Manufacturing Co., Ltd. All Rights Reserved | Sitemap
Update cookies preferences
WeChat