WABCO System Saver 318, Maintenance Manual

Page: 10 / 15

2 Troubleshooting
6 WABCO Maintenance Manual 31 (Revised 08-18)
Compressor leaks engine
coolant Loose fitting Check fittings at compressor and engine for leaks and verify fittings
are correctly torqued.
Cracked coolant port Replace cylinder head.
Porosity in cylinder head Replace cylinder head.
Leaking of gasket internal to the
cylinder head Verify cylinder head bolts are correctly torqued. Make necessary
adjustments.
Inspect gasket for cracks or signs of wear. Replace if necessary.
Replace cylinder head.
None of the above, but condition
persists Replace compressor.
Compressor pressurizes
coolant system or coolant
leakage to compressor
inlet Leaking of gasket internal to the
cylinder head Inspect gasket. Replace if necessary.
Cavitation or corrosion in cylinder
head Replace cylinder head.
Porosity in cylinder head or cylinder
head cracked Replace cylinder head.
None of above, but condition persists Replace the compressor.
Unloader leakage Possible internal damage, including
worn or damaged unloader piston
O-ring, porosity in unloader piston
bore, loose or leaking seal at unloader
piston bore Replace compressor cylinder head assembly.
Compressor head gasket
failure Discharge line blocked due to freezing
or carbon build-up Check for trap (low spots) in lines.
Make necessary repairs.
Clear discharge line. Replace line if necessary.
Check for carbon build-up. If carbon build-up is present, replace the
discharge line.
Frozen or blocked line to governor Clear blocked line. Replace line if necessary.
Check for air dryer malfunction. Repair or replace as required. Refer
to the air dryer manufacturer’s maintenance manual for service
information.
Governor malfunction Repair or replace the governor. Refer to governor manufacturer’s
maintenance manual for service information.
Incorrect cylinder head bolt torque,
machining defect on cylinder head or
block, defective cylinder head gasket Inspect gasket. Replace if necessary. Verify all bolts are correctly
torqued. If problem persists, replace cylinder head.
None of the above, but condition
persists Replace compressor cylinder head assembly.
Condition Possible Cause Solution
Table A: Compressor Troubleshooting Guide