WEICHAI WD10 Service Manual - page 144
Service Manual for WD10 Diesel Engine
134
deformed fins with nipper plier carefully.
14) Adjust the belt tension periodically. A freshly installed belt should be adjust to required tension,
adjust the belt tension again after 30min run-in period.
15) Pay attention to anti-loose and cleanliness of electric connectors.
16) Check whether there is oil dirt on A/C cooling system connecting parts, check each hose for
wear, aging, crack and oil leakage.
17) Long-time no using A/C may result in oil film dry out of some compressor parts, which may
affect performance or service life of A/C. So please remember to operate the compressor at
least once every month for 1~2min to keep the oil film in good condition.
18) Required refrigerant for A/C system is HFC-134a, periodically check refrigerant level because
of insufficient refrigerant will reduce cooling performance, even result in compressor failure.
19) After installing a new compressor, firstly you should test-run the A/C system at idle speed and
1500~1750rpm. It is strictly prohibited to speed up the engine to 2000rpm to test the A/C,
otherwise the compressor may be damaged instantly.
20) Refill lubricating oil if some parts of A/C system are replaced. Refer to Table 4-5.
Table 4-5 Lubricating oil refill
Part name
Lubricating oil refill quantity (ml)
Compressor
After removing the compressor, all residual oil in the compressor
must be drained to a measuring cup, and the drained oil cannot be
reused. Required lubricating oil quantity for the new compressor is
the residual oil quantity plus extra 30~50ml; If the removed
compressor needs to be installed on a new A/C system, then the
lubricating oil in the compressor doesn’t need to be drained, install
it directly.
Evaporator
30
Receiver drier
10~30
Condenser
30
Hose
10~30
System air leakage
60
(4) Leakage detecting methods for car A/C system
Leakage detecting methods for car A/C system mainly including: visual inspection method,
soap-suds inspection method, dye inspection method, electronic device inspection method, positive
pressure inspection method and negative pressure inspection method.