22-NA-074

Service Bulletin
Bulletin No.:
22-NA-074
Date:
April, 2022
INFORMATION
Subject:
Gasoline Engine Replacement Guidelines after Connecting Rod or Crankshaft Main
Bearing Damage - Replace Oil Cooler, Oil Cooler Lines and Oil Tank
Brand:
Model:
All
GM
Passenger
Cars and
Trucks
Model Year:
VIN:
from
to
from
to
2000
2022
—
—
Engine:
Transmission:
Gasoline
Engines Only
—
Involved Region or Country
North America, Europe, Uzbekistan, Middle East, Iraq, Israel, Palestine, Argentina,
Brazil, Bolivia, Chile, Colombia, Ecuador, Paraguay, Peru, Uruguay, Venezuela, Japan,
Cadillac Korea (South Korea), GM Korea Company, China, Taiwan, Thailand, Singapore,
Philippines, Australia/New Zealand, Egypt, Other Africa, South Africa
Information
The purpose of this bulletin is to inform service personnel that any time an engine
assembly is replaced due to a connecting rod or crankshaft main bearing failure, it is
necessary to also replace the oil cooler, oil cooler lines and oil tank if equipped.
If an engine experiences an engine failure due to a damaged rod or main bearing the
debris from the bearing is sent directly through the oil galleries and components that are
in the lubrication circuit.
These oil passages and components are very difficult to ensure they are completely
clean. If one of the failed components that carries oil is not clean and installed on a new
engine there is the possibility that the debris could transfer to the new engine causing
damage.
Oil cooler, oil cooler line and oil tank replacement is required due to the complex oil
gallery passages, making thorough and complete component cleaning difficult and
guarantee you completely removed all the debris. Reinstallation of an oil cooler and/or
cooler line that was removed from an engine with a bearing failure debris may result in
the transfer of any remaining debris into the new Genuine GM Part service engine. This
could cause damage or potential failure of the new Genuine GM Part service engine long
block.
Below are pictures of connecting rod or crankshaft main bearing failures that would
warrant an engine replacement along with the oil cooler, oil cooler lines and oil tank if
equipped.
Note: Some service engines come with the oil cooler and/or oil cooler line(s) already
attached to the new service engine. In this case, replacement of those components is not
necessary.
Note: Not every engine that has bearing damage requires an oil cooler, oil cooler line, oil
tank replacement or even the engine to be replaced. Please refer to Service Bulletin #
18-NA-073: Repair Guidelines for Engine Component Wear for additional information.
Copyright 2022 General Motors LLC. All Rights Reserved.
Page 2
April, 2022
Bulletin No.: 22-NA-074
Below are examples of connecting rod or crankshaft
main bearing damage that would require an engine
assembly replacement along with the oil cooler, oil
cooler lines and oil tank if equipped.
6020407
6020408
Version
1
Modified
Released March 31, 2022
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these
technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper
service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a
job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your
vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the
information.
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