"Rich Hampel" wrote in message
...
Better to simply 'tap into' the exhaust header outlet hose and 'branch'
into the hot water heater then back to the injection nozzle.

The circuit is a direct connect between the block and the exhaust
manifold on the Q series Yanmars ... so this may be difficult to do as
you propose. Besides, the water will be much hotter coming off the
exhaust manifold.


Rich,
The "exhaust header outlet hose" comes off the thermostat housing. The
housing mixes hot water from the manifold with cold water and then sends it
to the exhaust injection nozzle. So this water is not hot - it has already
been mixed with cold water.

In order to 'tap' into the HOT water exiting the mainifold, I would need to
have a tee that fits between the manifold and the thermostat housing. This
would have to be a custom made part either machined or cast. This location
would provide the most heat.

Actually, on the 2QM15, the circuit is not direct connected between the
block and the manifold - there is a hose that connects from the cylinder
head water outlet to the manifold. It is this hose that I was thinking of
tapping into.

GBM