Weifang 495 - Third Order Maintenance; Fourth Order Maintenance

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4. Third Order Maintenance
Besides the work of second order maintenance, the following
items should be added:
1),. Check the injection pressure and nozzle spray. Wash the
nozzle assembly and readjust the injection pressure if necessary.
Repalce it if it is in vain. .
2). Check and adjust the delivery advan.ceangle of theinjec-
. tion pump .artd replace the lubricating oil in it.
3). Wash the fuel tank and fuel pipes.
4). Check the connecting rod bolts ,maIn bearing nuts and
cylinder head nuts for their tightness.
-5). Flush, the o'uter surface of the 'batterywith' hot· water.
Check the specific gravity of the electrolyte ;it should be within 1.
24-1'. 27 when the ambient tempet'ature is of I·SoC. Replenish the
battery with electrolyte and 'charge:it_~ifthe specific gravity is low-
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er than 1. 24.
5.
Fourth Order IvlainOtenance
Besides the work c of' third order maintenance, the following
items should be added:
1 ). During the last shift before the engine going to be serviced
for the fourth order maintenance, the water scale in the, cooling
system should be remo\red first and the cooling system should be
washed cleaning.
2). Inspect the water pump for leakage,replaceothe water seal
or other parts if necessary and renew the grease in the bearing oJ
the water pump.
3). Dismantle the cylinder head ,check the valves for gas tight-
ness, clean off the deposited carbon, and see if lapping the valves
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