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Shangchai W Series Engine Operating Tips

Nov. 30, 2017

This article will guide you to know about Shangchai W Series engine operating tips. It will talk about engine oil pressure, coolant temperature, engine fault signs, engine normal and emergency shutdown.


4.6 Engine Operation

Cautions for operation of the engine:

● Pay frequent attention to oil pressure and coolant temperature. In case of any abnormality, stop the engine immediately for inspection.

Engine oil pressure:

 250 kPa @ idle speed (minimum allowable) .

 450–550 kPa @ rated speed (minimum allowable)

 600 kPa @ rated speed (maximum allowable)

 Coolant temperature:

 74–90°C (normal working range)

● When engine overheating starts to happen that is indicated by the coolant temperature alarming, reduce engine speed or load or take the both actions until the coolant temperature falls down into the normal range; otherwise, find the cause and remove the fault as per Section 6 Troubleshooting Guidelines.

● During the operation, especially sudden decrease of load, attention should be paid to avoid the failure of the governor, which can cause sudden increase of engine speed exceeding the defined value (usually called flying away). Once such case happens, make an emergency stop first and then check the engine for the cause.

Caution: Over-speed running will cause serious damage to the engine.


● Do not run the engine at the maximum power for over one hour. Run the engine at lower power for more than 30 minutes after running the engine at the maximum power for one hour. The sum of working time at the maximum power must not exceed 10% of overhaul period.

● It is recommended that idle speed be no higher than the stable idle speed and duration at idle speed no more than 1 hour.

● Continue running at load below 30% must not exceed l hour. Long time running at load below 30% will cause poor combustion. The engine must run at load high than 30% for 5 minutes after running at low load for l hour to prevent carbon deposit.

● Unless emergency, it is not allowed to increase or reduce engine speed or load suddenly. A smooth increase of speed and load is required.

There are significant signs before most engine faults occur, such as changes in performance, sound, or engine appearance. Listening and observing will help detect in advance or predict some problems of the engine that will occur later, with which the proper measures can be taken in time to eliminate such problems as can lead to a serious engine failure.


Shangchai engine.jpg


Typical engine fault signs:

Engine misfires

Engine vibrates abnormally

Engine sounds abnormal

Engine coolant temperature and oil pressure change abruptly

Engine produces black smoke

Engine power output is insufficient

Engine oil consumption is too much

Fuel consumption is too much

There is leakage of oil, fuel or/and coolant


4.7 Engine Shutdown


4.7.1 Normal shutdown

If the engine has just worked at a high speed and heavy load for a long time, reduce its load and speed gradually and run it at idle for 6 minutes before stopping it to let the engine cool down evenly and turbocharger speed fall

considerably so as to protect the engine and turbocharger. Turn off all the fuel tank cock, and raw water inlet cock (marine engine) after the engine has stopped.

If the engine will not be used for a period of time (6 months at most), keep it properly. Refer to Section 7 for engine storage.


4.7.2 Emergency shutdown

Under emergency or special condition, make an emergency stop to avoid serious engine failure. Manually pulling of the emergency stop handle can achieve an emergency shutdown.


4.8 Running-in of a New or Overhauled Engine

When the engine is new or has been overhauled, run the engine for 60 hours in running-in condition and change its oil thereafter before running it in full load condition so as to improve its moving parts working condition and its reliability and service life.

The way of running-in varies from one engine application and loading manner to another. In principle, engine speed and load in running-in process will be increased gradually with the running-in going on. Load should be 50% -80% of its full one, and speed should not exceed 80% of its rated speed. If the engine is for generator sets with constant speed, it is allowed to run-in at rated speed. However, long time running at idle or with too small load at the beginning of running in is not recommended.


Shangchai diesel generator set.jpg


Do not run the engine at idle or with low load for along-time either in running-in period or normal working period thereafter. Continuous, running at idle should not be longer than 10 minutes to avoid early wear due to carbon deposit or engine performance being affected.

The above running-in process with less time should also be required every time the cylinder liner, piston, piston ring, connecting rod bearing, main bearings or/and crankshaft are replaced.


Read the following articles to know more information about Shangchai diesel engine.

Shangchai W Series Diesel Engine Operation Instructions

Shangchai W Series Engine for Generator Sets (660 - 970KW)

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