Brent, If you or the previous owner ran the engine at low rpms frequently, then mix elbow pluggage is more likely. Diesels, and Yanmars in particular, like high rpm and heavy loads.
First thing to try is to disconnect the water discharge hose that connects to the mix elbow. With the engine cold, crank the engine and observe the flow for a short period. Not long or the hot exhaust will damage the muffler/exhaust hose system. Reconnect it and observe the water being ejected. Is it noticeable less? If so, the mix elbow is partially plugged and should be cleaned. If the water flow from the disconnected hose is very low, then start at the discharge of the raw water pump, disconnecting each section and checking for flow with engine running for short periods. Dennis C. On Sun, Apr 2, 2017 at 9:01 PM, Brent Driedger via CnC-List < cnc-list@cnc-list.com> wrote: > Thanks for the suggestion on the mixing elbow. That's my next item on the > list after the injector. I've read that Yanmar had some very big mixing > elbow issues with some falling apart inside from broken welds and pitted > stainless steel issues. > I'm not sure if there's a t-stat. I've never been able to find it. It's > possible there could be blockages in the raw water channels as a piece of > impeller had broke off years ago and could not be found. It was very small > and hopefully went through. > The good news is these are simple engines and Nigel's book has been > helpful. > Cheers > > Brent > 27-5 > s/v Wild Rover > >
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