Symptom: | What it may indicate: | What you should do: |
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2.0Oil on the Outside of the Compressor
2.1Oil leaking at compressor / engine connections:
2.2Oil leaking from compressor:
Engine and/or other accessories | Find the source and repair. Return the vehicle |
leaking onto compressor. | to service. |
(a)Leak at the front or rear (fuel ð Repair or replace as necessary. If the
pump, etc.) mounting flange.mounting bolt torques are low, replace the gasket.
(b)Leak at air inlet fitting.ð Replace the fitting gasket. Inspect inlet hose and replace as necessary.
(c)Leak at air discharge fitting. ð Replace gasket or fitting as necessary to ensure good seal.
(d)Loose/broken oil line fittings. | ð Inspect and repair as necessary. |
(a)Excessive leak at head gasket. | ð Go to Test 1 on page 29. |
(b)Leak at bottom cover plate. ð Reseal bottom cover plate using RTV silicone sealant.
(c)Leak at internal rear flange gasket. ð Replace compressor.
(d)Leak through crankcase. | ð Replace compressor. |
(e)(If unable to tell source of leak.) ð Clean compressor and check periodically.
(a) ð
ð (c)
Head gasket and rear flange gasket locations.
3.0Oil at air dryer purge/exhaust or surrounding area
Air brake charging system functioning normally. 
ðAir dryers remove water and oil from the air brake charging system.
Check that regular maintenance is being performed. Return the vehicle to service. An optional kit (Bendix piece number 5011327 for the Bendix®
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