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10. Check the battery for its voltage. Specific gravity of electrolyte should be 1.28～1.29
(atmospheric temperature is 15℃), and should normally be no less than 1.27. Additionally,
check if the electrolyte level is 10～15mm higher than plate electrode, and if sufficient, distilled
water should be supplemented.
11. After running every 200h or according to water muddiness/turbid-ness, change the
cooling water. Take out the thermostat, and fit the lid of thermostat (water-out pipe), and start the
engine and change ceaselessly the speed so that the cooling water flow fluctuates, flushing the
deposit in cooling system. Then, open the water-discharge valves on heat-radiator and engine body,
to discharge the water, and stop the engine. Inject continually clean water via radiator inlet, and
start the engine and have the engine idle, so that the water flows. Timely inspect the quality of the
water discharged through the discharge-valve, and after found clean, close all discharge-valves
and stop the engine, and fit back the thermostat.
12. When parts that have been removed for maintenance are fit back, it is necessary to ensure
their correct position and reliability.
III. Maintenance after running for every 500h
In addition to the instructions in "Maintenance after running for every 100h", followings
should also be performed.
1. Check injection pressure of fuel-injector and observe atomization quality, and if necessary,
clean and adjust it.
2. Check fuel-supply advance angle, and if necessary, adjust it.
3. Check gas valve for its tightness, and if found not complying with requirement, grind and
correct it.
4. Check the tightening condition for bolts on connecting rod, main bearings and flywheel.
5. Re-tight the bolts on cylinder cover, and adjust the valve clearance or lash as per
requirement.
6. Clean or replace the element of air filter. This can, depending on the dusty degree in
working environment, be performed as in "Maintenance after running every 100h" or be
performed in shorter interval.
7. Change the engine-oil in the speed regulator of fuel-injection pump.
8. Clean the cooling system. Clean liquid is a mixture of NaOH and water (every 150g NaOH
is mixed with 1L water). Before the cleaning, drain away all the water in cooling system, and then
fill fully clean liquid and remain 8～12h. Then, run the engine, and stop it after water temperature
reaches working temperature. Upon stoppage, immediately discharge the clean liquid, to prevent
the deposit of water-scale in the liquid. Finally, clean the cooling system with clean-water.
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