TSB210041-022620

3/1/2021
Leaking Air Compressor Coolant Line Grommets
Technical Service Bulletin
Technical Service Bulletin: TSB210041
Leaking Air Compressor Coolant Line Grommets
Released Date: 26-Feb-2021
Leaking Air Compressor Coolant Line Grommets
Warranty Statement
The information in this document has no effect on present warranty coverage or repair practices, nor does it authorize TRP or
Campaign actions.
Contents
Product Affected
L9 CM2350 L116B
L9 CM2350 L119B
L9 CM2350 L123B
L9 CM2450 L126B
Issue
Symptom:
External coolant leak along the coolant line running to/from the air compressor head. Leaks occur at either end of the line.
Root Cause:
Internal grommet is deteriorated and allowing passage of coolant around the grommet.
Verification
This document applies only to applications utilizing steel coolant lines from the air compressor to the engine cylinder block.
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Leaking Air Compressor Coolant Line Grommets
Nylon lines are not applicable to this document.
Coolant leaks occurring at either end of steel line requires inspection of the internal grommets.
Resolution
Remove both supply and return coolant lines between the engine cylinder block and the air compressor head. See
corresponding Service Manual. Reference Procedure 012-004 in Section 12.
Carefully inspect both ends of both lines.
If the internal grommet is deteriorated; remove all existing grommet material from both sides of the line and replace with
grommet, Part Number 3103015.
Install both supply and return coolant lines connecting the engine cylinder block to the air compressor cylinder head utilizing
existing service procedures.
Figure 1, Example of Deteriorated Grommet.
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Service Parts Availability
Service parts are available. See Table 1 for part numbers.
Table 1, Service Parts
Part Description
Existing Part Number
Obsolete
Superseded
New Part Number
Seal
S1003A
No
No
3103015
Publications Affected
Additional steps in inspection of air compressor coolant lines to assure grommets are serviceable.
Table 2, Publications Affected
Manual Type
Service Manual
Service Manual
Engine
Bulletin Number
L9 CM2350 L116B
/ L9 CM2350
L119B
L9 CM2350 L123B
5411330
5411465
Procedure Title
Procedure
Section
Air Compressor
Coolant Lines
Refer to Procedure
012-004
(/qs3/pubsys2/xml/
en/procedures/303
/303-012-004.html)
12
Air Compressor
Coolant Lines
Refer to Procedure
006-024
(/qs3/pubsys2/xml/
en/procedures/303
/303-006-024.html)
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Document History
Date
2021-2-16
Details
Module Created
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Leaking Air Compressor Coolant Line Grommets
Last Modified: 26-Feb-2021
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