IB19R001

BULLETIN NUMBER:
IB19-R-001
IMPORTANT SERVICE
INFORMATION FOR:
 SERVICE MANAGER
 SERVICE ADVISOR
 TECHNICIAN
 PARTS DEPARTMENT
 WARRANTY PERSONNEL
ISSUE DATE:
JUNE 2019
GROUP:
ACCESSORIES
ENGINE BLOCK HEATERS AND OIL PAN HEATERS USAGE
AFFECTED VEHICLES

All Isuzu Commercial Vehicles equipped with Engine Block Heaters
and/or Oil Pan Heaters (RPO IG3, I66, I0M, 13V, 13W, 14W, 15W)
INFORMATION
Isuzu provides optional engine block heaters and oil pan heaters which are designed to
warm the engine coolant and engine oil enough during extreme cold temperatures to
allow easy starting. Oil gets thicker (more viscous) as it gets colder, which slows down
the engine cranking speed. To ensure that the engine can turn over fast enough to start
when prevailing temperatures drop, use the recommended viscosity engine oil as set forth
in the vehicle’s Owner’s Manual.
NOTE: Engine block heaters and oil pan heaters should not be utilized until the
ambient temperature drops to below - 10ºF (-23ºC).
To use the heaters:
1. Use a heavy duty outdoor, three-prong extension cord. Lift or remove the heater
connectors’ protective cover and plug the electrical cord into the on-vehicle
connection point(s). (See Figures 1-4.)
CAUTION: Only use a heavy duty (12-gauge and greater), outdoor, three-prong
extension cord. DO NOT use an extension cord such as you would use for a
household lamp because the cord may overheat and cause a fire.
Engine Block
Connection
Oil Pan
Connection
Figure 1 - 2019MY & Earlier N-Diesel
Figure 3 - N-Gas
Figure 2 - 2020MY N-Diesel
Figure 4 - 2019MY & Earlier FTR
NOTE: 2020MY Diesel vehicles (N-Series and FTR) equipped with both an engine
block heater and an oil pan heater have connection points for both of these
accessories integrated into a single socket.
2. Plug the cord into any three-prong 110 volt outlet (normal household current) to
start the warming process. It may require several hours to sufficiently heat the
engine. Outside temperature, oil viscosity, etc., will affect how long the engine
block heater should remain plugged in.
3. Unplug the electrical cord(s) before starting the vehicle and install any protective
covers over the connectors. Make sure the cord is properly stored in a safe
location (such as inside the cab) away from engine moving parts.
After starting, be sure the engine goes through a normal warm-up period to
sufficiently warm the engine oil before placing the engine under load. This will
ensure proper lubrication of the engine.