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Old 02-12-2015, 12:19 AM   #27
LarryM
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City: League City, TX
Vessel Name: Pelago
Vessel Model: Wellcraft 3300 Coastal
Join Date: Aug 2011
Posts: 1,069
Quote:
Originally Posted by Al View Post
Larry M- Could you expound more on the use of vinegar? How do you circulate and recover in a "Raw Water" application? My raw water ex's out the exbaust. It would seem more productive to be cleaning out the closed system. Wrong?

Thanks,
Al
Al,

It is pretty easy and works on almost any size fresh-water cooled marine engine. I use a 5 gal plastic pail and a Jabsco Water Puppy pump. The pump has standard male hose connections on the inlet and outlet so you can use garden hose and plastic hose reducers/couplers to make the connections to the engine hoses. If also changing the raw water impeller, first close the seacock, remove the impeller and replace the cover. That way, you can make one connection on the seacock side of the water strainer. The other connection is to the heat exchanger outlet to the mixer elbow. Drain the raw water system using the pump or gravity. Next fill the plastic pail with vinegar or flushing solution and use the pump occasionally to circulate the mixture through the system. Start by back-flushing to remove any loose materials from the heat exchanger. Half way through the process, reverse the hoses and circulate in the original flow direction. Finally flush with fresh water using a regular water hose. You should now have a clean water strainer, raw water pump housing and heat exchanger. Reconnect the original hoses and don't forget to replace the impeller and open the seacock before starting the engine. If you are not replacing the impeller, make the flush connection directly to the inlet side of the heat exchanger. You can use the same rig and method to flush A/C coils too.
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