IB23-J-001A

BULLETIN NUMBER:
IB23-J-001A
IMPORTANT SERVICE
INFORMATION FOR:
✓ SERVICE MANAGER
✓ SERVICE ADVISOR
✓ TECHNICIAN
✓ PARTS DEPARTMENT
✓ WARRANTY PERSONNEL
ISSUE DATE:
JUNE 2023
GROUP:
ENGINE
REPLACEMENT LONG BLOCKS & INSTALLATION TIPS
AFFECTED VEHICLES
▪
2012 - 2020MY Isuzu N-Series Vehicles
Equipped with 6.0L Gasoline or RPO KL8 Alternative Fuel Capable
Engines
▪
2022MY Isuzu N-Series Vehicles
Equipped with 6.0L Gasoline Engines
INFORMATION
In the past, replacement 6.0L gasoline and RPO KL8 Alternative Fuel Capable engines
came as a complete assembly. These engines are now provided as long block
assemblies. The new configurations do not include many of the components that were
provided with or pre-installed on the complete engine assemblies previously sold as
replacement parts.
NOTE: Before installing the replacement long blocks, be sure to carefully read
and understand completely all documentation included with the replacement
blocks (e.g., bulletins, installation instructions, and warnings).
The following components must be transferred from the old engine or replaced with new
components as necessary:
I = Included with engine assembly
T=Transfer from original engine if undamaged and clean
R=Replace with new
Components
Crankshaft Pulley Bolt
Crankshaft Pulley
Crankshaft Position Sensor
Camshaft Position Sensor and Wiring Harness
Camshaft Position Actuator Magnet
Engine Oil Pressure Sensor
Engine Coolant Temperature Sensor
Knock Sensors
Oil Filler Cap
Oil Level Indicator, Indicator Tube
Water Pump
Cylinder Heads Bypass Pipe
Exhaust Manifolds
Gas
I
T
T
T
T
T
T
T
T
T
T
T
T
KL8
I
I
I
I
I
T
T
T
T
T
T
T
T
Motor Mounts
Ignition Coils, Spark Plugs and Wires
Engine Oil Filter
Intake Manifold Assembly
Fuel injectors and rail, the throttle body, the PCV hoses,
attached sensors, and vacuum hoses
All drive belt driven components and brackets (e.g., cooling
fan, generator, vacuum pump, power steering pump, drive
belt tensioner, etc.)
The flex plate
The transmission bellhousing adapter (2022MY Only)
Oil Pan and oil pickup/screen *
Gaskets, all
T
T
R
T
T
T
I
T
T
T
T
T
T
T
T
T
R
T
T
R
*NOTE: If the old oil pan, oil pickup/screen assembly, or oil pan baffle are damaged
or contaminated with failed engine debris that cannot be completely removed, they
must be replaced with new components.
New Crankshaft Bolt
Figure 1. Gas Engine
Figure 2. KL8 Engine
Crankshaft Pulley Installation Tips
There are specific procedures related to removing and reinstalling the crankshaft pulley.
Please refer to the appropriate Workshop Manual for the detailed repair procedure.
Additionally, to properly remove and reinstall the crankshaft pulley, the following essential
service tools are required:
J 45059 Angle Meter
J 41816 Crankshaft Balancer Remover
J 41816-2 Crankshaft End Protector
J 42386-A Flywheel Holding Tool
J 41665 Crankshaft Balancer and Sprocket Installer
J 41478 Crankshaft Front Oil Seal Installer
Essential service tools may be purchased from isuzutrucks.service-solutions.com.
Serial Number Locations
Refer to Figures 3 and 4 for the locations of the replacement Engine Serial Number
(ESN).
For all 6.0L (gasoline and KL8) engines the ESN must be programmed into the ECM.
Figure 3. Gas Only
Figure 4. KL8
Note: for replacement KL8 engines, the ESN can be found on labels on the oil pan
and on the cylinder head and also on a label on the packaging material for the
new engine.
PARTS INFORMATION
Part Number
8-12729-512-0
Description
ENGINE ASM; GAS 6.0L
8-19260-746-0
ENGINE ASM; GAS 6.0L
Application
2012-2020MY NPR/NPRHD with
6.0L RPO KL8 ‘Alternative Fuel
Capable’ option
2012-2020MY NPR/NPRHD 6.0L
without RPO KL8 ‘Alternative
Fuel Capable’ option
2022 6.0L NQR/NRR GAS