I was searching for a new 3 inch heat exchanger (HX) for our M25. I had upgraded from the OEM 2 inch HX many years ago. We had a persistent fresh water coolant leak - I use the more expensive non-toxic stuff, about $20!!! Recently the HX bracket broke and we found evidence of continued leakage of coolant. We found a new bracket at our local Universal distributor. We replaced all the 7/8" fresh water coolant hoses on the engine (I'd replaced the hoses to the hot water heater a few years ago). Turns out the broken bracket had let the HX rub against sharp edge of the broken bracket that was still bolted to the engine, and the HX had developed a small hole in the shell of the HX right where it rests on the new bracket - we could see the the coolant leak but the shell was resting on the rubber bicycle tubes I'd installed between the shell and the HX.
In searching for a new HX, I realized Sen-Dure made them and got in touch by phone with them. If you know the Universal part #, Sen-Dure has a great cross reference system. Ron was a pleasure and a great help. I looked in the Universal manual, right here in our C34 Tech wiki section, and the Torreson website (www.marinedieseldirect.com
) & (http://www.marinedieseldirect.com/catalogs/catalog_group.php?owner=mdd&page_ident=200142-49&model=M-25%20/%20M-25XP%20/%20M-25XPA&manufacturer=Universal&title=Heat%20Exchanger%20Group%20-%20New&quant_position=&catalog=200142&printparts=&printservice=&printoperators=&comment1=Part%20number%20299835%20is%20for%20the%20M-25XP
.), and learned that there are TWO different 3 inch HXs.
Universal Part #302631 is the HX with two separated brackets welded to the shell. It is used on M25XP engines. The brackets are bolted to the back of the engine. This is part #11B on the Torreson parts page.
Universal Part #299835 is the HX without the bracket. It is used on M25 engines and those M25XPs that may, just may, have the HX that is held on by TWO HUGE HOSE CLAMPS. There is a separate bracket that bolts on to the engine, is shaped like a saddle, and has a slot for the hose clamps to grip and then grasp the HX [this is Torresson Part #12]. The HX is part #11A on the Torreson parts page. [Torreson Part #11, #299049 is the OEM 2 inch HX that came with the M25 engines. Many of us have upgraded to the 3 inch HX for our M25 engines.]
Ron sent me the detailed drawings of both models, and I determined I needed the #299835.
The Universal prices are $860 and $761. Yikes!!! Sen-Dure is $456 + s/h & tax. WOW!
If you need a HX, or other engine related parts, check their catalog on line. Better yet, call 'em.
Please know that Ron is one of the Really Good Guys
Sen-Dure Products, Inc.
6785 NW 17th Ave.
Fort Lauderdale, Florida 33309