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We just purchased a T27. We need we needed to replace the fresh water pump, and were told to purchase part #YM-128695-42010 That part has the pump and the alternator bracket mounted behind it. Does anyone know if the pump is available by itself? I have attached 2 photos, one with the new pump (the shiny metal) installed on the old alternator mount, and the second with a the old pump that was removed with the new bracket.
We installed the pump yesterday, and had no issues. We ran the motor for 20 minutes while the bilge pumped out, and then started on our 6 hour trip from Huntington LI to City Island, NY. We were 45 minutes along, when the motor slowed down and died. We were able to sail back to our starting point and tried to figure out what was wrong, but struck out. A mechanic will look at the motor later today.

Congrats on your Tartan 27 and welcome to the group.

Was raw water actually flowing? If you have a wet exhaust setup,
exhaust will sputter water out. Do you have a temperature
gauge for the engine?

Most likely with a diesel, it's a fuel issue, either water
getting in to the fuel or solids (potentially solids that formed
in the tank) clogging filters or injectors, or air getting in
to the fuel lines and needing to bleed and possibily fuel lines
sealed better.

Detach the line going out of the fuel lift pump and try pumping
fuel in to a jar while you turn over the engine (for only 10 seconds
at a time then a 30 second rest). Fuel should flow. If that works,
plug it back in to the pump then bleed the injectors. If it doesn't,
test bypassing fuel filters with little clear plastic in-line filters
of the right size and then bleed until spurts of diesel shoot out.
After bleeding, try firing up the engine. If there's a valve
release lever, use it while bleeding and testing the lift pump.

Whichever thing you that gets fuel flowing again likely indicates the
problem: clogged filter, air in the fuel lines, etc. If injectors
are clogged, none of those will work. Send the injectors out for
service. If the fuel that gets pumped out of the lift pump separates
in to water and oil, you had water in the fuel. Get a separating
filter and check it each time you use the engine.

If the engine isn't even turning over but the starter selenoid clicks,
it may have overheated and seized, but you'd likely have noticed that
it was very unhappy before that would happen.

When draining the water out of a water pump, such as when replacing
it like you did, you may have to prime it by pouring water in or
opening a bleed screw and letting air bleed out and water flow in.
That potential for getting air trapped in the pump is part of why
it's a good idea to always make sure water is flowing through the
system and sputtering out in the exhaust (or whereever it comes out)
when starting the engine.

You said you have a mechanic coming but posting this troubleshooting
guide anyway as some of these items are pre-flight checks and the
others can be useful to have the next time you're troubleshooting
underway. Also, carrying a spare starter and selenoid (which may
be combined in to the same unit) is a really good idea. And
spare filters. Always spare filters, even if they're just the
little clear in-line dealies.

Cheers,
-scott

We checked the filters and bled the lines. Couldn't get the injectors due to rust. Also, I learned after the event the fuel is very old. That probably was the root cause of the problem. We didn't have the pump to pump it out, and since we were far from home, we decided to have the mechanic work on it. He didnn;t get to it yesterday, but will definitely work on it today.

I got some inexpensive generic fuel pump of the correct line size on
eBay when I was first troubleshooting this engine (boat was sold to
me with the diesel not running) and I'd figured out I was having
some fuel supply issue (from the lack of fuel out of the lift pump).
Worked fine and was definately faster than the Kubota's mechanical
pump, but went back to the mechanical pump after figuring out it was
working and the cause was a 2nd hidden filter between the cockpit
and the fuel tank that was clogged. But I still carry it for priming
fuel filters, testing if needed, transferring fuel if ever needed, etc.

I gave it a cigeratte lighter plug. But actually using it instead of
the mechanical one would certainly make bleeding faster tho maybe
a bit fast and messy if I'm not careful. I imagine the existing
mechanical pump would need to be removed and the hole sealed or
else given a closed loop of oil to pump so that it didn't wreck
itself and wedge.

Replacing hardened fuel lines and keeping hose clamps snug could
help prevent drawing air in to the system. I was having trouble
there too.

"All a diesel needs is fuel and engine oil" is surprisingly tricky.

-scott, #93