TSB160017-021616

New Lubricating Oil Filter Bypass Valve
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Technical Service Bulletin Number
TSB160017
Technical Service Bulletin
Subject
New Lubricating Oil Filter Bypass Valve
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






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ISM (All Versions)
ISX12/11.9 (All Versions)
ISX12/11.9 G (All Versions)
ISX15 (All Versions)
QSM11 (All Versions)
QSX11.9 (All Versions)
QSX15 (All Versions)
Issue
The lubricating oil filter bypass valve can leak. This is caused by improper sealing of the
lubricating oil filter bypass valve plunger in the lubricating oil filter head.
The existing lubricating oil filter bypass valve plunger must seat on a machined surface within
the lubricating oil filter head. As the result of variation in machining and casting tolerance, the
lubricating oil filter bypass valve plunger may not fully seat and allow debris to enter the
engine.
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New Lubricating Oil Filter Bypass Valve
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Resolution
A new single piece cartridge style lubricating oil filter bypass valve has been released to
address this issue. Both the bypass valve plunger and spring have been replaced by the new
single piece cartridge style lubricating oil filter bypass valve that uses an o-ring to seal the
cartridge to the bore. The cartridge contains a bypass valve plunger which seals against a
machined seat surface internal to the cartridge, which addresses the sealing issues of the old
design. See Table 1 below for service parts information.
See Lubricating Oil Filter Bypass Valve Installation Instruction, Bulletin Number 4908439.
Table 1, Service Parts
Existing
Part
New Part
Part
Obsoleted Superseded
Description
Description
Number
Bypass
Valve
3820320 Yes
No
New
Part
Product
Number
ISX12/11.9,
Single Piece
ISX12/11.9G,
Cartridge
ISX15,
4357177
QSX11.9,
Style Bypass
QSX15 (All
Valve
Versions)
ISM and
Bypass Valve 4386023 QSM11 (All
Versions)
Part Identification
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New Lubricating Oil Filter Bypass Valve
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Figure 1, Left: New Single Piece Cartridge Style Bypass Valve. Right: Obsolete Spring and
Bypass Valve.
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New Lubricating Oil Filter Bypass Valve
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Figure 2, Left: New Single Piece Bypass Valve Installed. Right: Obsolete Spring and Bypass
Valve Installed.
Document History
Date
2016-2-16
Details
Module Created
Last Modified: 25-Feb-2016
Copyright © 2000-2010 Cummins Inc. All rights reserved.
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3/1/2016