ISL/QSL and ISC/QSC External Oil Leaks From Oil Pan and Oil Pan Gasket

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Technical Service Bulletin
Technical Service Bulletin:
Released Date: 14-May-2019
TSB140061
ISL/QSL and ISC/QSC External Oil Leaks From Oil Pan and Oil Pan Gasket

ISL/QSL and ISC/QSC External Oil Leaks
From Oil Pan and Oil Pan Gasket
Core Issue
The ISC/QSC CM850/CM2150/CM2250/CM2350, ISL G CM2180, and ISL/QSL
CM850/CM2150/CM2250/CM2350 product lines offer multiple lubricating oil pan options
that vary the orientation and mounting hardware. The lubricating oil pan option is
selected by the original equipment manufacturer (OEM) based upon the application
needs. Lubricating oil pan options, which include the block stiffener plate, may provide
additional robustness in high duty cycle applications, or applications where the chassis
and powertrain is subjected to elevated levels of bending and twisting.

Confirmation
Repeated external oil leaks from the lubricating oil pan and lubricating oil pan gasket for
the same engine serial number (ESN), or multiple ESNs in the same application and
operating environment with complaints of an external oil leak from the lubricating oil pan
and lubricating oil pan gasket.

Resolution
The installation of the block stiffener plate, Part Number 3927606, may reduce instances
of the lubricating oil pan leaking and cracking on ISL/QSL and ISC/QSC engines. There
may be some variation between the required parts, depending on the original lubricating
oil pan option. It is the responsibility of the repair location to make sure that the proper
parts are installed and the lubricating oil pan (OP) option is correctly updated on
QuickServe® Online. Contact a Cummins® Authorized Repair Location or Cummins®
Distributor for a list of oil pan options. Note that oil pan options which use a sealant
between the block and block stiffener have been obsoleted. When installing the block

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ISL/QSL and ISC/QSC External Oil Leaks From Oil Pan and Oil Pan Gasket

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stiffener, edge molded gasket, Part Number 3930408, must be installed between the
block and the block stiffener. For additional support, contact a Cummins® Authorized
Repair Location or Cummins® Distributor.
Table 1 provides a list of additional parts that are needed for installation of the block
stiffener. Installation of the block stiffener adds 1 quart of capacity to the lubricating oil
pan. Dipstick recalibration is recommended, but not required.
Table 1, Additional Parts Needed for Block Stiffener Upfit
Part Number

Part Name

Quantity

Notes

3927606

Plate, Stiffener

1

Block stiffener.

3930408

Edge Molded
Gasket

1

Gasket between
block and block
stiffener plate.

32

Longer capscrew
needed with
addition of stiffener
plate.

3900632

Lubricating Oil Pan
Capscrew

3928737

Suction Tube
Brace

1

Tube brace with
spacers for
stiffener.

3901865

Suction Tube
Brace Capscrews

2

For new tube
brace.

For installation instructions, reference the appropriate sections and procedures of the
Service Manual or Troubleshooting and Repair Manual for the engine being serviced:
• Procedure 001-089 (Block Stiffener Plate) in Section 1.
• Procedure 007-025 (Lubricating Oil Pan) in Section 7.
• Procedure 007-035 (Lubricating Oil Suction Tube) in Section 7.

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
2014-5-14

Details
Module Created

https://quickserve.cummins.com/qs3/pubsys2/xml/en/tsb/2014/tsb140061.html

5/22/2019

ISL/QSL and ISC/QSC External Oil Leaks From Oil Pan and Oil Pan Gasket

Date

Page 3 of 3

Details

2016-4-18

Added ISL G CM2180

2016-7-13

Corrected spelling error.

2019-5-14

Corrected lubricating oil pan capscrew part number.

Last Modified: 14-May-2019

https://quickserve.cummins.com/qs3/pubsys2/xml/en/tsb/2014/tsb140061.html

5/22/2019