always something

[spareparts]

see if you can find a diesel shop nearby, especially if they are marine oriented. They check and repair intercoolers and heat exchangers on a regular basis. Call them first, they may want more to check it than its worth, I'll see what I can find

[THEFERMANATOR]

They are a bit pricey, $550 for a new 4" one.

http://bpi.ebasicpower.com/pc/HEXMER...ercruiser+3.7L

Here's an EBAY used one.

http://cgi.ebay.com/ebaymotors/Mercr...QQcmdZViewItem

[cfelton]

Thanks fellas, I'm gonna check mine out today and pressure test it ta see where its leaking.Thanks Ferm, I had'nt seen that one, good price so far! I'll keep a close eye on it.

[cfelton]

I got your message Spare, I'll give him a call . Thanks alot!!

[cfelton]

I pulled it off and removed the end caps. I blew it out with compressed air until about dry. I flushed the coolant side out with fresh water. I plugged the hose that goes to the thermostat and made up a fitting for the other coolant hose so I could attach a water hose to it. Filled it with water and then pressurized it for about 15 minutes but never saw it leak a drop. Water pressure is about 60 psi. Maybe I did'nt wait long enough or maybe its gotta be hot to expand the metal enough to leak. What do you all think? The last time I ran it was about a week or so ago and I let it get to 140 degrees, cut it off and drained the seawater side of the heat exchanger side out then. I'm baffeled!

[spareparts]

try putting air to it, pull it off the engine. Use regulated air pressure on it(15 psi max should do it) and submerse it in a bath tub, look for bubbles. The only other place I could think of for water and anti freeze to mix would be at the riser, it could have posiibly leaked back down the riser to exchanger hose(just guessing)

[cfelton]

Man Spare, we must be on the same wavelength. I slept on it and thats what I thought about! I'll try running the bathtub half full of really hot water and putting a little air on it. I just put a new riser/tank on it, and thinking about it, looks like the whole exhaust manifold and riser would have to fill completely up before it could run over into the seawater pipe on the riser and back down into the heat exchanger (I think). Its gotta be the heat exchanger, I'll let ya know what I find out. Thanks Spare!!