There can be lots of simple reasons why an engine overheats. My Universal overheats if the belt is loose.
Pull the hose from the mix elbow and see if you have good flow. If you do, maybe the elbow is clogged with soot. If you don't have good flow, work your way upstream until you find why. Dennis C. Touche' 35-1 #83 Mandeville, LA On Thu, Apr 10, 2014 at 2:01 PM, Frederick G Street <f...@postaudio.net>wrote: > Frank -- just so I understand: your 3QM is overheating? Does the engine > run well otherwise? Before you go to all the trouble and expense of > re-powering, find a really good diesel guy to look at your engine. > > I had a great guy do some work on my 3QM a few years back, and he told me > the engines were originally built for hard, continuous use (industrial > compressors and the like), and if properly maintained, they should last a > *very* long time in a sailboat. > > I did find an issue with mine overheating a couple of seasons back. > Because the fresh water heat exchanger is mounted to the engine at an > angle, you can check the fluid level when the engine is off, and it will > appear that the coolant level is fine. But with the engine running (and > cool, so you don't get burned), pull the fill cap and you'll see that the > system needs more coolant; it settles to the bottom end of the heat > exchanger where the cap is when the pump isn't running. You can also see > if there's much coolant running with the cap off. > > Other possible things to do: check the coolant pump impeller; rod out the > passages in the heat exchanger; make sure you've got plenty of raw (sea) > water running through; check the exhaust mixing elbow for build-up. > > And I'm sure other listers will add to this. > > Fred Street -- Minneapolis > S/V Oceanis (1979 C&C Landfall 38) -- on the hard in Bayfield, WI :^( > > On Apr 10, 2014, at 1:14 PM, Frank Woronkowicz <fworonkow...@gmail.com> > wrote: > > My boat has Yanmar 3QM30 with original added fresh water circ. jabsco pump > and Sunrod HEx. overheating on the Chesapeake Bay. I think to replace > engine and propeller. Please let me know if any LF owner already did this > work and what is approx cost. > The second question is windllas type and installation. Did anybody > install windlass in anchor compartment? > I have her for approx. 20 years and finally these should be done, > Thanks > Frank Woronkowicz > LF 38 s/y Gdynia > ANNAPOLIS MD > fworonkow...@gmail.com > > > > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > CnC-List@cnc-list.com > >
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