Follow the directions contained in TB 750-651 for
checking and maintaining cooling system coolant.
To help avoid air pockets, add coolant slowly, at 5
U.S. gallons (19 liters) per minute or less. See Refill
Capacities (page 2-9).
Stop the engine. Raise the hood. Clean the area
around the Positive Crankcase Ventilation Valve.
Bring the coolant level to within 1/2 inch (1 cm) of
the bottom of the fill pipe.
Start the engine with the radiator cap off. Add
coolant, if necessary, when the level stabilizes.
Stop the engine. Replace the radiator cap if the
seal is damaged. Install the radiator cap. Re-install belly
Remove the cover. Remove the spring 1 piston
assembly 2 and sleeve 3 . See below.
Disassemble the piston assembly 2 . discard the diaphram 4 . Wash all parts in clean non-flammable solvent.
Replace any parts, or the gasket 5 , if damaged. Assemble the piston assembly 2 . Use a new diaphram 4 . Coat both
flange sides of the diaphram 4 and both sides of the gasket 5 , with gasket cement. Install the valve parts in the housing
6 . Install the cover.