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Water pump for 318

Seagoing Houseboater

Seagoing Houseboater

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I have been switching from a M318 to a newer LM 318. (this is going in an old SeaGoing Houseboat) One of the problems we have run into is with the water pump. (I had a Sherwood dual pocket pump with the older 318) - I was hoping to be able to use the dual with the newer engine but with the need for a circulating pump (the older one did not have) the bracket that was on the older engine (that held the dual) will not work. I am needing a braket that a single pocket pump will work with. WOULD ANYONE HAVE ONE they'd like to sell? With that said . . . Would anyone have a single pocket pump (#G7B) that they would like to trade for a dual? If you've priced them . . . this is a pretty good offer. Any thoughts or offers?? Thanks - - (can't wait for spring)
 
ill sell you a Sherwwod G7 for 150 and you pay all the shipping

and Ill paint it chrysler blue after I prime it(sandblasted yesterday) and give you the bracket

fully painted ready to install

PM me for questions
 
hey seagoing , if you are interested in selling your double pocket , I am interested . let me know thkx opie sounds like a good deal on that G7
 
Since you mention the need for a circulating pump...... does this mean that you have switched to a Closed Cooling system on this engine?
If so, is there any way that a crankshaft pump could be fit, and then your sea water hose configuration modified to accommodate?
Or is your set-up as such that you must stay with a belt driven sea water pump?

Just a question and suggestion.
 
Hey guys I have twin 318's with a raw water cooling system for sure. Is that all that cools these or is there a coolant system as well? I don't have a tank or overflow but the more i read the more I see this. So is there a combo raw water and coolant and how would I find out what I have. Just bought this boat a month ago. Thanks for any help.
 
Raw water cooled application will not have a large canister type piece of hardware that is a heat exchanger. This would be for FWC system using antifreeze. In a FWC system, water from the lake, goes through the heat exchanger and removes heat then dumps overboard. Only antifreeze in the block. Raw water system pumps water through the block and out; no antifreeze involved.
 
I believe if you don't have a re-circulating water pump on the front of the block then you should have a dual-pocket waterpump (2 impellers) for seawater and circulation.
 
I have three pullies on the front of the block, impeller, alternator and one other one on the bottom which I assumed turned the other two. Would this be the water pump? And if so would this mean that it has a coolant system? The three pullies are shaped in a upside down triangle and the impeller and alternator are on top. What would the bottom one be?
 
Are you saying 3 pulleys, including the crankshaft pulley? Or are there 3 pulleys besides the crankshaft pulley. The very bottom pulley should be the crankshaft which turns the others. One being the alternator, one being the seawater pump (either single pocket if a circulation waterpump is mounted front and center on the block with it's own pulley, or a dual-pocket waterpump that serves both purposes, seawater and circulation). Depending on the application (Dana outdrives) there could also be a power steering pump that is used to actuate the clutch during shifting (common on early houseboats).
 
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