TM 5-2420-230-24-2
Gear Housing, Front (001-033)
B3.9 and B5.9 Series Engines
Page 1-72
Section 1 - Cylinder Block - Group 01
Gear Housing, Front (001-033)
General Information
Troubleshooting the front gear housing and gear train con-
sists of checking for leaks at the gaskets (front cover, timing
pin assembly and fuel injection pump) and the front crank-
shaft lubricating oil seal, inspecting the gears, and mea-
suring backlash when required.
Replace the front crankshaft oil seal. Refer to Procedure
001-023.
Gear noise emitted from the cover can indicate worn gear
teeth.
NOTE: Excessive backlash can affect engine timing and
engine performance.
The gear train consists of the crankshaft gear (1), lubri-
cating oil pump gear (2), idler gear (3), the camshaft gear
(4), the fuel injection pump gear (5), and the accessory
drive gear (6), if used.
The gear housing provides a support for the fuel injection
pump, the timing pin, and the accessory drive gear, if used.
L-750
