Maintenance Draining the Closed Cooling System 8.1 Liter Engines (F-Series) 1. With the engine turned off locate and loosen the lower end cap from the heat exchanger ( 1 ). After water has completely drained, retighten the lower end cap of the heat exchanger. 2. Note the hose orientation on the raw water pump ( G ). Loosen the hose clamps ( 2 ) and remove the hoses ( E , H , & L ) from the raw water pump and heat exchanger. Crank the engine briefly, (1 or 2 crankshaft revolutions) but do not start the engine, to clear the water from the pump. Rein- stall the hoses and secure the clamps in the same orientation as removed. 3. Remove drain plugs from exhaust manifolds.
Change the level of the boat to ensure complete drainage. After water is completely drained, rein- stall drain plugs and torque to 29 N•m (22 lb. ft.). 21207 7743722 - Downloaded from www.volvopenta.com 13/05/2008 20:17:06 CAUTION! Be sure the engine side of the sys- tem has adequate antifreeze to protect it from the anticipated temperatures to be encoun- tered. Failure to maintain adequate antifreeze may result in engine damage during freezing temperatures. 4.3 GL Draining Only When draining the 4.3 GL carbureted engine, be sure to remove the intake manifold drain plug, located be- hind the alternator tensioning bracket, to drain any re- maining water in the intake manifold.
Otherwise, follow the directions below. 4.3, 5.0, and 5.7 Liter Engines (F-Series) Check the coolant level and antifreeze concentration (check antifreeze manufacturer’s instructions). Make sure the antifreeze’s freeze point is adequate for ex- pected temperatures. To drain the raw water system of your Volvo Penta en- gine (with factory installed closed cooling): 1. With the engine turned off locate and loosen the lower end cap from the heat exchanger ( 1 ). After water has completely drained, retighten the lower end cap of the heat exchanger. 22849 VPA 7743722 English 10-2004 87