TM 5-2420-230-24-2
B3.9 and B5.9 Series Engines
Coolant Heater (008-011)
Section 8 - Cooling System - Group 08
Page 8-7
Maintenance Check (008-011-008)
When operating, the engine block or oil pan heater should
make a sound and the adjacent parts should be warm to the
touch.
Preparatory (008-011-000)
CAUTION
Coolant is toxic. If not reused, dispose of in accordance
with local environmental regulations.
Cylinder Block Water Heater
Drain at least 19 liters [5 gal] of coolant. Refer to
Procedure 008-018.
Disconnect the block heater electrical cord.
Remove (008-011-002)
10 mm
Loosen the block heater retaining nut.
Remove the block heater from the block.
Clean (008-011-006)
Clean the core plug hole thoroughly. Make sure there are
no burrs or sharp edges that can cut the o-ring.
L-1063
