WEICHAI WD10 Service Manual - page 145
Service Manual for WD10 Diesel Engine
135
1) Visual inspection method
Refrigerant and freezing engine oil are mutually
soluble, so there must be oil trace at the leaking
site (but slight oil trace in compressor shaft seal
is normal). When refrigerant leakage occurs,
freezing engine oil generally leaks along with
the refrigerant. Pay attention to hose joints and
components that covered by oil dirt for leakage
detection.
2) Soap-suds inspection method
Apply the to-be inspected part with soap-studs,
bubble will occur if there is leakage.
3) Dye inspection method
Fill dyed refrigerant into the system, and colored
trace will occur if there is leakage.
This method can also be used to detect minor
leakage, but will leave many impurities in the
A/C system.
4) Electronic device inspection method
Turn on the electronic leak detector and it will
produce small “Didi” sound, when a leakage is
detected, frequency of the “Didi” sound will
increase.
There are many ways to operate the electronic
leak detector, the most common one is:
Approach the probe to the component or joint
(about 5mm). Avoid direct contact, otherwise
error reading may occur, even damaging the
probe.