YANGDONG SERIES Y85 Operation & Maintenance Manual page 21

6.Check the tension of the fan belt,and readjust it if necessary.
7.Fill the nipple of cooling water pump bearing with ZG -4 calciumbased grease with a
grease gun.
8.Clf-an out the d'lst in intake manifold,clean the inside of the aircleaner,brush off the dust
gathered on the paper element surface,and clean the inside of the exhaust manifold and silencer.
9.After every 200 accumulated operating hours,check the injection pressure and spray
pattern of injedion.lf necessary,dismantle the injector,clean the nozzle set,and readjust the
injection pressure.
10.Check the voltage of battery and the specific gravity of battery acid,which should be
within 1.27-1.28(at ambient temperature of 20"C).When It is less than 1.l4,the battery should be
recharged.The level of battery acid should be lO-lSmm above the pole plate.If insufficient,add
distilled water to the required level.
l1.All parts dismantled for maintenance should be washed,and cleaned and correctly
reassembled.After wassembly,start the engine and check whether it is in proper operation.All
faults should be remedied.
ill.Maintenance after Every 500 Accumulated Operating
Besides the work l)f maintenance after every 100 accumulated operating hours,the following
items are needed:
1.Check the injecion pressure and spray pattern of the injector.If necessary,dismantle the
injector,clean the nozzle set and readjust the injection pressure.
2.Cheek fuel delivery of the injection pump.and recalibrate it on a test bench if possible.
Check the injection timing,and readjust it if necessary.
3.Cheek the ;,ealing of the intake and .exhaust valves.If necesary,grind and lap the valve
seats and readjust the valve lashes.
4.Check the tightness of tbe connecting a rod mian bearing cap and flywheel bolts.
5.Retlghlen tbe cylinder head bolts <,nd aJjust the valve lashes according to the rule given
in sectiOn 4.
6.Cle,U) or n·p1.1ce the paper dement
(,f
air .cleaner.
7.Ckall tbe coding system.The dectnilll!; solution can be prepared by adding 150 grams of
caustic soda ( aOHj to eVl'lry litre of water.Before cleaning,drain the system completely anJ then
fill in the
Sdm!~
I
apucity with cleaning solution.Let it remain in the system for 8-12fJ.Then start
th
a
engine alld
it:
[I
it until the temperure (,f Gleaning solution reaches normal operating
temperature.Stop
1he
engine and drain
tlIP
system immediately in order to avoid settling of scale
\\itlnCl the
~y~tt;m.Finallv,nush
the system "ith
cl~an
.
valer
until all sediment is flushed out.
3-2