always something

[macojoe]

This is why I went Outboard!! I/O never stops needing 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)