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**JPA Cate** · 03-09-2014, 00:51

If there're lots of hours on the water pump, sometimes the backing plate is scored so much it leaks. If you flip it over, so there's a new surface, polish it first, of course, then re-install, and perhaps that seal having been renewed will do the trick.

A.

jimbunyard · 03-09-2014, 02:57

Maybe rust clogged exhaust elbow?

Snore · 03-09-2014, 03:24

If it looks good to the exchanger it could be the flow from the exchanger to the exhaust elbow. When was the last time you changed your zincs? Sometimes the zincs decay and drop pieces. In my case these pieces "conveniently" got logged in the fitting that connects the cooling water hose from the heat exchanger to the mixing elbow. It was only after I sourced, purchased and installed a new elbow that I discovered all I needed was a $5 90 or perhaps just ramming a coat hanger into it to clear the part. DOH!

My suggested and admittedly untried test would be to open the cooling seacock and remove the cooling water hose from the mixing elbow. With the throttle off, crank the engine and see if you get water out the cooling system.

**HappyMdRSailor** · 03-09-2014, 05:01

Quote:

Originally Posted by Penny Elledge

Thanks so much for the replies!! You guys are GREAT!!!

We are having everything looks good through the heat exchanger, we are stumped... can't figure out what a part is on the very back of the motor... looks like it comes out of the gear box... we are whupped from working on it all day and forgot to take a pic, but we will tomorrow and post it so you guys can maybe glean some info out of it. We are working so hard to get this engine going... We have been restoring her for almost a year... it has been quite a labor of love... We lovingly spend most of our time working on her and plan to sail her to Greenland and then to Ireland to get married. Here are a couple shots of her and will post the pic of the part in ? tomorrow.. and as I said than you from the bottom of our hearts and bilge for your help...

Ya'll don't say what "good through the heat exchanger" means???

You mean you got water pumping through the system from inlet to outlet of the exchanger?

Tranny cooler is your mystery part after that?

Only thing left for restrictions and blockages in the exhaust system has been pointed out...