DaveS Posted November 10, 2012 Share Posted November 10, 2012 My boat is now out of the water for the winter, and prior to it being lifted, I drained the engine side of the heat exchanger cooling system, and re-filled it with a 50% mix of antifreeze and de-ionised water. My intention is now to drain down the raw water side of the system, and leave it empty for the winter. However, looking at the manual for the engine (Yanmar 4JH3-HTE 100HP), it might not be possible to get at the raw water pump, for which the manual recommends loosening the four cover-plate screws, to let the water drain from within. The difficulty arises from the fact that the engine is quite a big' lump' in a relatively small space, and the raw water pump lays on the left hand side of the engine (viewed for the rear), and at the bottom of the of the engine. As you can see from the photo, there is virtually no space to get down that side of the engine with a spanner, and be able to see and undo the four cover-plate bolts. The other raw water drain points I think I can get to, but having to leave water in the pump, is a concern. I could try and stuff some lagging around the pump, but this really isn't a good option IMO. Another option would be to take the raw water intake hose off of the 'sea cock', put the end of the hose in a bucket of 50/50 anti-freeze and water mix, then run the engine up to suck it up into the system, and leave it there for the winter. What do you guys do? Dave Quote Link to comment Share on other sites More sharing options...
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