Raw Water Pump Impeller Replacement How To Guide

For 1991 and later alpha gen ii water pumps.

Raw water pump impeller replacement how to guide. For raw water pump applications first close the water intake thru hull valve. Kit contains the replacement sea water pump body impeller plate o ring and attaching hardware. Identify the impeller profile code letter by placing the impeller on the profiles on pages 98 100. The impeller is made up of several flexible blades and designed to move a fluid by rotation.

10 re install the intake and exhaust water hoseâ s to the raw water pump and tighten the hose clamps and drain. Silicone or soapy water. If you have the impeller in front of you. Some experts advise you to remove the impeller from the raw water pump lubricate it with vaseline petroleum jelly and put it back in the pump.

Take the old impeller out by gripping the hub of the impeller using channel lock or needle nosed pliers. Twist and pull the impeller out of the pump. For non rock key version pumps install the key into the shaft prior to installing the impeller. Replacement is relatively simple.

The bolts on the raw water pump and the raw water pump to mounting bracket should be tightened to 8 8ft in. Replacing impellers in raw water pumps. Installation apply a non petroleum based lubricant to impeller i e. What is a raw water impeller.

Then replace the cover to the pump housing but leave the cover screwed in place loosely. Install the impeller with a twisting motion onto the shaft. Then replace the o ring on the case with the new one in the impeller kit and put the raw water case back together again. Your volvo penta d4 or d6 impeller is a major part of the engines seawater system which cools the secondary internal fresh water system which in turn cools the engine.

This prevents the impeller from sticking to the pump housing. Replaces mercruiser 817275a4 817275a3 and sierra 18 3570.