TSB140136-092914

Oil Leaks at the Non-Hydraulic Drive Front Cover
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Technical Service Bulletin Number
TSB140136
Technical Service Bulletin
Subject
Oil Leaks at the Non-Hydraulic Drive Front Cover
Issue
Oil leaks are being detected on the gear housing and front cover of ISX 12 CM2250, ISX 12
CM2350 X102, and ISX12G engines by black light inspection. This leakage is attributed to the
porosity in the cast aluminum gear housing wall that separates an oil galley from an adjacent
bolt hole that retains the gear housing cover. See Figures A and B below.
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Oil Leaks at the Non-Hydraulic Drive Front Cover
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Figure A
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Oil Leaks at the Non-Hydraulic Drive Front Cover
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Figure B
Verification
The suspect housings were installed on engines starting 01-Sep-2013 to 15-Nov-2013.
Engine serial number (ESN) range is 75021712 to 75025321. If the ESN or build date is within
this range, use black light inspection to verify if oil is leaking in the lower front cover bolt holes.
Resolution
Thoroughly clean the area around the leaking bolt hole to remove all oil. Apply a wicking
thread sealant as deep in the bolt hole as possible. Cummins® recommends Part Number
3823689 (50ml. bottle), Part Number 3824039 (10ml. bottle), or Loctite™ 290. These actions
are taken for the sole purpose of sealing the bolt hole to prevent oil leakage, and are not
required for retaining the bolt or making sure of proper engine operation.
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.
Document History
Date
2014-9-29
Details
Module Created
Last Modified: 02-Oct-2014
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11/3/2014