TSB160017-031720

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
•
•
•
•
•
•
•
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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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 Both the bypass valve plunger and spring have been replaced by the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
New
Part
New Part
Part
Obsoleted Superseded
Part
Product
Description
Description
Number
Number
Bypass
Valve
3820320 Yes
No
ISX12/11.9,
Single Piece
ISX12/11.9G,
Cartridge
ISX15,
4357177
Style Bypass
QSX11.9,
Valve
QSX15 (All
Versions)
Bypass
Valve
ISM and
4386023 QSM11 (All
Versions)
Part Compatibility
ISX/QSX (All Versions):
• The threaded plug, which secures the lubricating oil filter bypass valve, varies
depending on which lubricating oil filter head is installed on the engine.
• To properly secure the lubricating oil filter bypass valve, the correct threaded plug part
number must be used.
• To determine correct lubricating oil filter bypass valve threaded plug selection:
◦ Use a small ruler or scale to measure depth of lubricating oil cooler head bore.
Measure depth from top of countersink to outside edge of lubricating oil filter
head bypass valve bore. See Figure 1 below.
◦ Measure length of threaded plug from underside of threaded plug head to end of
threaded plug. See Figure 2 below.
• Use results of bore depth measurement to determine correct lubricating oil filter bypass
valve threaded plug part number. Reference Table 2 below.
Table 2, Lubricating Oil Filter Head Threaded Plug Selection: ISX/QSX (All Versions)
Engine Build
Date (Reference
Only)
Bypass
Valve Bore
Depth
Required
Original Plug
Plug Part
Part Number
Number
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Plug Length
(Measured From
Under Head to End)
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New Lubricating Oil Filter Bypass Valve
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Table 2, Lubricating Oil Filter Head Threaded Plug Selection: ISX/QSX (All Versions)
Engine Build
Date (Reference
Only)
Before 10 May
2000
2000-2006
Bypass
Valve Bore
Depth
68 mm
[ 2.68in ]
Required
Original Plug
Plug Part
Part Number
Number
3679770
4059434
4059434
Plug Length
(Measured From
Under Head to End)
19.5 mm [ 0.77in ]
19.5 mm [ 0.77in ]
After 2006
64.5 mm
[ 2.54in ]
4952760
4952760
16 mm [ 0.63in ]
If Unknown
68 mm
[ 2.68in ]
If Unknown
4059434
19.5 mm [ 0.77in ]
If Unknown
64.5 mm
[ 2.54in ]
If Unknown
4952760
16 mm [ 0.63in ]
Figure 1, Measurement of Lubricating Oil Filter Head Bore.
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Figure 2, Measurement of Lubricating Oil Filter Head Threaded Plug.
Part Identification
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Figure 3, Left: New Single Piece Cartridge Style Bypass Valve. Right: Obsolete Spring
and Bypass Valve.
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Figure 4, Left: New Single Piece Bypass Valve Installed. Right: Obsolete Spring and
Bypass Valve Installed.
Document History
Date
2016-2-16
2017-3-17
Details
Module Created
Added Part Compatibility Section.
Last Modified: 20-Mar-2017
Copyright © 2000-2010 Cummins Inc. All rights reserved.
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