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Flushing 318

Discussion Forum at MarineEngine.com » Chrysler Inboard and Sterndrive » Flushing 318 « Previous Next »

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steven nichols
New member
Username: opie77

Post Number: 1
Registered: 04-2009
Posted on Monday, November 02, 2009 - 06:09 pm:   Edit Post Delete Post View Post/Check IP

greeting gents;
is it possible there is a method to back flush my 318's to remove any debris that has accumulated in water jacket, my starboard has been giving me problems overheating and i am thinking i might have some internal blockage thanks 1970 trojan h-boat, paridise found
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Fastjeff
Senior Member
Username: fastjeff

Post Number: 7064
Registered: 09-2003


Posted on Tuesday, November 03, 2009 - 05:47 am:   Edit Post Delete Post View Post/Check IP

I assume this is a raw water cooled motor? If so, just remove the drain plugs in the block and run it for a few minutes. You could do the same for a F W Cooled motor, long as you keep dumping water in the exchanger.

Jeff
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Buehler Jet
Member
Username: bogdenz

Post Number: 96
Registered: 06-2009
Posted on Tuesday, November 03, 2009 - 12:14 pm:   Edit Post Delete Post View Post/Check IP

Steven - I've had issues with sand building up in my block. I bought a couple of plumbing fittings that thread into the block drain holes. The other end of the fittings is a hose barb (maybe 3/8th). I inserted a fitting into each side of the block and connected compressed air to one and a shop vac to the other. The adaptor I made for the shop vac used a clear hose and I could see sand being sucked out. A note: I’d drained the block and blew compressed air through it the weekend before this process……to give the sand/silt a week or so to dry as much as possible.

While this process worked well for fine sand and sediment, I’m not sure it’ll do much for heavier buildup.

If you do, in fact, have some cooling blockage, it could also be the result of rusting in the smaller, head-to-block passages.
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Fastjeff
Senior Member
Username: fastjeff

Post Number: 7075
Registered: 09-2003


Posted on Tuesday, November 03, 2009 - 02:42 pm:   Edit Post Delete Post View Post/Check IP

That's a neat idea. If you shot compressed air in the drain holes while runnign the motor it would really clean that sucker out. I used to clean out RV radiators that way.

Jeff

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