TM 5-2420-230-24-2
Fuel Pump Timing (005-037)
B3.9 and B5.9 Series Engines
Page 5-62
Section 5 - Fuel System - Group 05
This table must be used to maintain proper fuel injection pump-to-engine timing. The critical parts list (CPL) number
from the engine dataplate and the Control Parts List Manual, Bulletin No. 3379133-20, must be used to determine
whether the engine is certified, and if so, what year and regulating agency (EPA or CARB).
Given this information, use the following table to determine which letter on the fuel injection pump drive gear is aligned
with the camshaft gear.
NOTE: Timing mark alignment is not required for the Nippondenso EP-9 or Bosch in-line drive gear.
Letter on Pump Gear
Engine Model
Injection Pump
Certification
A
4B3.9, 4BT3.9
Stanadyne pump
Noncertified
A
4B3.9, 4BT3.9, 4BTA3.9
Lucas CAV DPA pump
All noncertified
B
4B3.9, 4BTA3.9
Bosch VE
1986, 1987 EPA, All pre-
1986, All noncertified
C
6BT5.9, 6BTA5.9
Bosch VE
1986, 1987 EPA, All pre-
1986, All noncertified,
CPL 600
D
6B5.9, 6BT5.9
Stanadyne
Noncertified
D
6B5.9, 6BT5.9, 6BTA5.9
Lucas CAV DPA
All noncertified
E
6BT5.9, 6BTA5.9
Bosch VE
1986, 1987, 1988, 1989,
1990, 1991, 1992 CARB
F
4BT3.9, 4BTA3.9
Bosch VE
1986, 1987, 1988, 1989,
1990, 1991, 1992 CARB,
1988, 1989, 1990, 1991,
1992 EPA
G
6BTA5.9
Lucas CAV DPA
All Fire Pumps
H
Not used at this time
N/A
N/A
To verify that the fuel injection pump is timed correctly, first
check the alignment marks on the pump flange and gear
housing.
NOTE: One mm of rotation past the timing mark will ad-
vance or retard (depending on direction of rotation) the
pump timing by 1 degree.
The Lucas CAV DPA, DPS, Stanadyne DB4, and the Bosch
V
E fuel injection pumps all have a provision for locking the
pump shaft at a position corresponding to top dead center
for cylinder No. 1. New and reconditioned fuel injection
pumps should be received with the shafts located in this
position.
L-922