SB23-J-001A

BULLETIN NUMBER:
SB23-J-001A
IMPORTANT SERVICE
INFORMATION FOR:
 SERVICE MANAGER
 SERVICE ADVISOR
 TECHNICIAN
 PARTS DEPARTMENT
 WARRANTY PERSONNEL
ISSUE DATE:
AUGUST 2023
GROUP:
ENGINE
N-GAS VACUUM PUMP REPLACEMENT PART UPDATE
AFFECTED VEHICLES

2008MY – 2022MY Isuzu N-Series Vehicles equipped with 6.0L
Gasoline Engines
This bulletin supersedes service bulletin SB23-J-001. This bulletin is being
revised to clarify parts application information. Please discard previous bulletin
SB23-J-001.
INFORMATION
The vacuum pump service part for affected vehicles listed in this bulletin has been
superseded and is now the same vacuum pump that is the service part for the 6.6L gas
engine. The updated pump requires the outlet vacuum hose be rerouted for proper fitment.
Follow the service procedure below to install the updated replacement vacuum pump and
reroute the outlet vacuum hose as set forth below.
In order to improve the supply of these parts it has been decided to revert to making vacuum
pumps available individually rather than in kits. IT IS ESSENTIAL THAT THE CORRECT
PULLEY FOR THE APPLICATION IS USED (REFER TO TABLE BELOW). Part numbers
are as follows:
Part Number
Description
Application
Use Pulley Part Number
PUMP; VAC
8976569800
6.0L Gas Engine
8975421801
6.6L Gas Engine
8976577030
NOTE: If you have a vehicle that has an additional drive belt due to an upfit such as a
sweeper application, and therefore does not have clearance for the tapered design
pulley, please contact [email protected] for part number information
SERVICE PROCEDURE
Removal
1. Remove the drive belt from the drive pulley.
2. Remove the two (2) vacuum hoses (inlet and outlet) from the vacuum pump.
3. Remove zip ties holding the upper vacuum line from the vacuum pump back to the
curve of the Air Inlet Duct. (See Figure 1.)
NOTE: Zip tie locations for removal may vary according to model year.
Figure 1
4. Working through the pulley access holes, remove the three (3) vacuum pump
mounting bolts. Save these bolts for reassembly.
5. Remove the vacuum pump from the accessory bracket.
6. Install a new vacuum pump pulley onto the replacement vacuum pump using special
tool EN-49756 Vacuum Pump Pulley Installer.
NOTE: Pump damage may occur if proper installation procedures are not followed.
7. Ensure that the mounting surface of the engine is clean and free of debris.
8. Install the pump onto the engine and working through the access holes in the pulley
install the three mounting bolts.
Tightening torque:
25 N·m (18 lb·ft)
9. Connect the inlet vacuum line onto the vacuum pump inlet fitting.
10. . Reroute the outlet vacuum hose along the inlet air duct, in front of the upper radiator
hose, attaching the line to the hose with two (2) zip ties as shown in Figure 2. Complete
the routing by connecting the end of the vacuum hose to the vacuum pump outlet
fitting.
Figure 2
Line – New route of vacuum line.
Rectangles – Original zip ties, do not remove.
Ovals – Placement of new zip ties.
11. Install the drive belt on the drive pulley.