I replaced the heat exchanger on my M18 last year. The hoses are very difficult to remove and replace, especially the wire lined hoses for the sea water pump which I replaced as a precaution. The work is able to be done but sometimes it is worth the 2hrs labor charge to avoid the cut knuckles and frustration..........Good luck.
--- In [email protected], David Savlin <dsav...@...> wrote: > > Hiyas y'all -- > > We launched Persephone this past week. YAY! On our annual dip into the Root > River in Racine, Wisconsin (where we winter our pride and joy) I performed > the regular check for leaks from the thru-hull fittings and hoses. All dry, > so I heated up the glow plugs and (as is usual after a winter) the motor > eventually coughed to life. We have an inboard Universal M-18 motor, and I > pulled the door open slightly as would fit without taking the companionway > ladder off. I didn't see anything suspicious, but a little voice in my head > said, "This year is a new year. This year is a special year. Take the ladder > off and open the door all the way." So I pulled off the ladder and opened > the engine compartment door all the way, and LO AND BEHOLD! There's a stream > of water spurting out of the lower weep hole of the sea water pump. OH NOES! > > Upon further inspection, it was spurting quite a bit of water at idle, which > dried up at higher revolutions, which was odd. I consulted our experienced > yard boys and also my handy dandy M-18 manual. Given that this water pump is > 22 years old we decided this past winter pushed it over the edge into > failure. (The engine was properly laid up for winter as evidenced by the > antifreeze that spurted out the exhaust at startup.) The pump was indeed > pushing water as evidenced by the exhaust. > > The marina office checked and as there are no more rebuild kits available > for this Sherwood 6-screw pump, a whole new pump would need to be ordered > and installed. They quoted me a max of 2 hrs labor, which makes sense given > what I saw (four screws holding the whole thing to the engine block, two > hoses attached, all easy to reach). The pump, though, was quoted as $450 > from Torresson. Does this agree with you all? I was going to do the work > myself but I was afraid of getting 22 yr old hoses off and back on, and the > quote of 1-to-2 hrs labor wasn't out of the question. > > Thanks for your advice! > > on a side note, we intend to look into servicing the fuel filters (both of > em) and looking into the heat exchanger zinc / engine coolant / etc this > year. This motor DOES have a heat exchanger, right? My boat is hull # 6480 > (I think) from 1988. > > David > s/v Persephone > Chicago, IL >
