TSB150196-121615

Natural Gas Leak into Engine Cooling System
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Technical Service Bulletin Number
TSB150196
Technical Service Bulletin
Subject
Natural Gas Leak into Engine Cooling System
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.Information Only - OEM Related
Matter Not Covered By Cummins® - Contact Appropriate OEM Dealer or OEM Representative
For Additional Information
Contents
Product Affected
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B Gas International CM556
B Gas Plus CM556
B Gas Plus CM556
B5.9G
C Gas Plus
C Gas Plus CM556
C8.3G
ISB5.9 G CM2180
ISC8.3 G CM2180 C101
ISL G CM2180 EJ
ISX12 G CM2180 EJ
L Gas Plus CM556
L10 Gas
Issue
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Natural Gas Leak into Engine Cooling System
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Many compressed natural gas (CNG) and liquefied natural gas (LNG) fuel systems use engine
coolant to warm the natural gas high pressure regulator and/or heat exchanger. A leaking
original equipment manufacturer (OEM) high pressure fuel system component can cause
natural gas to leak into the engine cooling system. This natural gas leak forces coolant out the
coolant reservoir.
Verification
WARNING
If natural gas leaks are present, do not store the vehicle inside or in any area that is
covered. Severe personal injury can result from asphyxiation or explosion.
WARNING
Natural gas is explosive and flammable. Always be sure to maintain adequate ventilation in
the work area. Keep all cigarettes, flames, pilot lights, arcing equipment, and switches out of
the work area and areas with shared ventilation to reduce the possibility of severe personal
injury or death when working on a natural gas system.
WARNING
Natural gas is lighter than air. Check the ceiling of the area where work is to be done for any
possible ignition source.
WARNING
Always have proper ventilation when working on a natural gas system
When diagnosing external coolant loss:
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Check the coolant reservoir for the presence of natural gas. Use a combustible gas
detector, Part Number 3165179, to check for natural gas inside the coolant reservoir.
Visually check to see if bubbles are present with the engine off and high pressure fuel
valve on.
If bubbles are not observed and the leak detector does not detects combustible gas in
the coolant reservoir, proceed with published troubleshooting.
If bubbles are observed or the leak detector detects gas, the high pressure fuel system
must be tested for leaks. See the Resolution section below.
Resolution
Troubleshoot the high pressure fuel system components. See equipment manufacturer service
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Natural Gas Leak into Engine Cooling System
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information or OEM fuel system supplier instructions.
Fuel system provider customer service contact numbers*:
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Agility® Fuels Systems +1-949-267-7745
Trilogy Arctic Fox® Inline CNG fuel heater +1-330-915-2303 extension 109
Quantum Technologies + 1-800-816-8691
Chart® Industries + 1-888-877-3093
NOTE: *Contact information subject to change. This is not a complete list of fuel system
providers.
Document History
Date
2015-12-16
Details
Module Created
Last Modified: 04-Jan-2016
Copyright © 2000-2010 Cummins Inc. All rights reserved.
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2/1/2016