Service Manual for WP6 Diesel Engine
105
6) Check and adjust installation direction of unloading valve (should be conform to the arrow).
(3) Air compressor pumping oil.
Fault phenomenon: There is engine oil overflows in air filter and air compressor exhaust port, and
engine oil comes out with water when discharging the gasholder (wet).
Possible causes:
1) Large intake resistance or bad intake filter.
2) Large oil return resistance.
3) Severe wear of air compressor cylinder sleeve, piston and piston ring; inversely installed or
jammed oil ring that results in air compressor pumping oil.
4) Insufficient cooling of air compressor.
5) Too much unclean matter in gasholder.
6) Long-running of air compressor.
7) High pressure in engine crankcase.
8) High engine oil pressure.
9) Deteriorated engine oil.
10) Defective air compressor.
Troubleshooting:
1) Check air compressor filter for damage and flaw, check whether the filter element is clean,
replace the damaged parts; check whether air compressor intake pipe is twisted or deformed,
ensure the intake pipe inner diameter meets the minimum requirements.
Table 1 Minimum inner diameter requirements for intake pipe and intake pipe joint
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