Service Manual

Air Compressor Coolant Lines ISB, ISBe and QSB (Common Rail [...]
Page 12-10 Section 12 - Compressed Air System - Group 12
To buy Cummins Parts and Service Manuals, Training Guides, or Tools go to our website at https://store.cummins.com
Using an engraving pen, mark the number 2 next to the
CH marking already engraved on the cylinder head.
Install the compressor head and valve assembly.
Install the compressor head and valve assembly. Refer to
Procedure 012-007 in Section 12.
Perform the Air Compressor Diagnostic Test to verify the
air compressor is functioning properly.
• For ISBe, ISB, and QSB (Common Rail Fuel System)
engine, use the following procedure. Refer to
Procedure 012-014 in Section 12.
• For QSB4.5 CM2250 EC engine, use the following
procedure. Refer to Procedure 012-014 in Section 12.
If the air compressor does not function properly, replace
the air compressor cylinder head. Refer to Procedure
012-007 in Section 12.
Air Compressor Coolant Lines
(012-004)
Preparatory Steps
NOTE: Draining the cooling system is not required on air
cooled air compressors.
Drain the cooling system. Refer to Procedure 008-018
Initial Check
Inspect the coolant hoses for splits, cracks, hardening, or
other damage.
Inspect metal coolant lines for kinks, corrosion, or cracks.