Apply a light coat of clean lube oil on the filter gasket. Install the filter (5) and hand-tighten.
Open the water shutoff valve (8) and check for leaks.
If leakage is still present, install a new filter element (5) and recheck.
If the new filter element still leaks, replace the head assembly (4). Refer to removal and
replacement steps of this procedure.
For coolant inspection and test procedures, refer to TB 55-1900-207-24.
Refer to Table 2-1, Item 9, for removal of water filter elements only.
Drain cooling system (TM 55-1905-223-10).
Remove water filter elements (5) by unscrewing using the filter wrench. Discard filter elements.
Remove water filter head assembly (4) by removing two hexagon head capscrews (9), lockwashers
(10), and preformed packing (3) from counterbores.
Remove pipe plug (1) from water filter head assembly (4).
Remove spring pin (7) and shutoff valve shaft (8) from water filter head assembly (4).
Remove preformed packing (6) from shutoff valve shaft (8). Discard preformed packing.
Remove any corrosion found on the surfaces of the water filter head (2) where the head mates to the
water filter gaskets, and where the head mates to the thermostat housing gasket.
Smooth out by using sand paper any pits, nicks or other surface iregularities found on the gasket
mating surfaces. Any flaw that cannot be readily removed will require the replacement of the water
filter head assembly (4).