I got a laser-tach from Amazon for ~$20. It came with reflective tape which you cut to size. I put a piece on the main pully and transmission output shaft. I used it to make sure of the accuracy of the installed tach and verify the gear ratio. Then I also used it to set the low idle speed. Low idle has to be tweeked for accuracy when cold and hot. Maybe it changes, maybe not. Various diesel additives are available but after searching the internet for comparisons based on lubricity the product that stood out was made by opti-lube. Their original formulation, XPD, seems to work well for me. The concentration is strong enough that you can actually smell the product after it has been properly mixed. By having the laser-tach I was actually able to detect about 200rpm increase in speed while at idle and a corresponding higher rpm while at full load.
Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD On Aug 12, 2014 3:49 PM, "David Knecht via CnC-List" <cnc-list@cnc-list.com> wrote: > The Universal M4-30 in my boat tends to stall frequently when shifting. > This primarily happens when moving forward and shifting into reverse, > which is of course not good for stress levels when one has to pull into a > slip and you can't count on slowing down. Maybe I could increase the RPM > somewhat before shifting, but that seems bad for the transmission so I > haven't done it. Any ideas what this might indicate? Thanks- Dave > > Aries > 1990 C&C 34+ > New London, CT > > > > _______________________________________________ > This List is provided by the C&C Photo Album > > Email address: > CnC-List@cnc-list.com > To change your list preferences, including unsubscribing -- go bottom of > page at: > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > > >
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