4-28. ENGINE - Continued
Drain the cooling system by opening the radiator draincock. The engine cooling system capacity is
approximately 16 gal (60 L).
Loosen hose clamps (4) and remove the crossover tube (5).
Loosen hose clamp (6) and disconnect hose (7) from water pump.
Remove the bolts (1) and lockwashers (2) securing the covers (3) to the thermostat housings.
Remove the thermostat covers (3) and gaskets (8). Remove the thermostats (10) and discard.
Clean the thermostat sealing surfaces in the thermostat housing (11) and covers (3).
Remove the seals (9) from the thermostat covers and discard the seals.
Position the new seals (9) so the lip of the seal faces away from the thermostat when installed. Install
with installer J8550 and driver handle J7079-2 (9). Place a new gasket (8) on each thermostat housing
Place new thermostats (10) in the thermostat housings.
Attach the covers (3) to the housings with bolts (1) and washers (2). Tighten bolts to 35 ft. lb (47 Nm).
Slide the hose (7) between the water pump and right hand housing over the housing and tighten clamp
Install the bypass tube (5) on both covers and tighten clamps (4).
Refill the cooling system as detailed in LO 5-4210-220-12.
Start the main engine and check for leaks. When engine cools recheck radiator level. Top up as