Maintenance Draining the Cooling System CAUTION! When temperatures drop below freezing, failure to completely drain the cooling system will result in serious damage to the engine and exhaust manifolds. To assure complete drainage, probe all drain openings with a piece of wire to remove any blockage. NOTE! The following steps are very important in protecting your engine from damage in freezing conditions. If unsure of how to perform any of the following steps, see your Volvo Penta dealer for a complete end-of- season/winterization service. Freeze damage to the engine package is not covered by your Volvo Penta limited warranty. Perform these procedures with the boat out of the water.
It will prevent damage to cooling sys- tem components if temperatures drop below freezing. When draining the engine, raise or lower the bow of the boat to keep the engine level. This will provide for complete drainage of the block and manifold. If the bow of the boat is higher or lower than the stern, some water may be trapped in the block. 22800 7743722 - Downloaded from www.volvopenta.com 13/05/2008 20:17:06 Raw Water Cooled Engines 1. With the engine turned off, locate and open the engine drain petcocks ( B ) located on both sides of the engine block. CAUTION! Be sure that all water is drained from the engine.
If no water drains when the petcocks are opened, remove the petcocks and use a piece of wire to clear any obstruc- tions from the drain hole. Failure to drain all the water from the engine may result in en- gine damage during freezing temperatures. 2. Remove drain plugs from exhaust manifolds ( A ). Raise or lower the bow of the boat to ensure complete drainage. After the water has com- pletely drained, reinstall the drain plugs and torque to 29 N•m (22 lb. ft.). 3. Note the hose orientation on the raw water pump. Loosen the hose clamps and remove the hoses from the raw water pump. Loosen the hose clamp on the large diameter hose and remove it from the circulation pump. 4.
Crank the engine briefly, (1 or 2 crankshaft revo- lutions) but do not start the engine, to clear the water from the pump. 22848 5. Reinstall the hoses and secure the clamps in the same orientation as removed. CAUTION! Failure to connect the raw water pump hoses in the correct orientation may damage the raw water pump impeller. 86 VPA 7743722 English 10-2004