TSB160066-110716

Service Bulletin Details

Public Details for: TSB160066-110716

This technical service bulletin describes the verification and resolution of external oil leaks originating from a cracked rocker lever cover on certain engines caused by an oxygen sensor branch of the wire harness being pinched between the


- 9999 -

Models from 9999
9999 CUMMINS ISX12 G 
Lubricating Oil Leaks at Rocker Lever Cover
Page 1 of 4
Technical Service Bulletin Number
TSB160066
Technical Service Bulletin
Subject
Lubricating Oil Leaks at Rocker Lever Cover
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
• ISX12 G CM2180 EJ
Issue
Symptom:
• External oil leaks originating from a cracked rocker lever cover.
Root Cause:
• Oxygen sensor branch of wiring harness is pinched between rocker lever cover and
rocker housing during removal and installation of rocker lever cover. See Figure 1
below.
• Capscrew 11 and/or 14 is/are still installed when attempting to remove rocker lever
cover. See Figure 3 below for rocker lever capscrew position.
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12/5/2016
Lubricating Oil Leaks at Rocker Lever Cover
Page 2 of 4
Figure 1, Example of Pinched Wiring Harness.
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Lubricating Oil Leaks at Rocker Lever Cover
Page 3 of 4
Figure 2, Example of Rocker Lever Cover Cracking.
Figure 3, Rocker Lever Cover Capscrew Position.
Verification
Inspect rocker lever cover near cylinder number six for:
• Cracks.
• Engine wiring harness that may be caught under rocker lever cover.
Inspect engine wiring harness for:
• Signs of pinching.
Resolution
• Verify all rocker lever cover capscrews are removed before attempting to remove
rocker lever cover from engine.
• Replace rocker lever cover if cracked. See ISX12 G CM2180 EJ Service Manual,
Bulletin 4310682. Refer to Procedure 003-011 in Section 3.
• See Service Instructions section below.
Service Instructions
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Lubricating Oil Leaks at Rocker Lever Cover
Page 4 of 4
• During removal and installation of rocker lever cover, secure oxygen sensor branch of
wiring harness away from rocker lever cover to prevent wiring harness pinching
between rocker lever cover and rocker lever housing.
• When removing rocker lever cover, do not use a pry bar to break seal between rocker
lever cover and rock lever housing. A pry bar will cause damage to rocker lever
housing and rocker lever cover gasket
• A flat head screw driver can be used to assist in removal of rocker lever cover. Insert
screwdriver underneath rocker lever cover and twist, but do not pry or lift rocker lever
cover with screw driver.
Document History
Date
2016-7-1
2016-11-7
Details
Module Created
Non-Product Problem Solving (PPS)
Last Modified: 30-Nov-2016
Copyright © 2000-2010 Cummins Inc. All rights reserved.
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12/5/2016

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