If this is a DIY project
, then it is a big ask to get step by step instructions as there are many many variables.
The easier way is to throw cash at the problem - go to a Yanmar
dealer and ask them to sell and install the engine
However if you are serious about a DIY installation
then here is a very brief outline. This is based on what I did some years back when I removed a Stuart Turner petrol engine
and replaced it with Yanmar 2GM20
Measure existing engine space and check if new engine will fit, if not, work out how to increase engine room space.
Check existing prop shaft to see if big enough for extra engine power.
Check existing prop aperture to see if big enough for larger prop.
Solve any problems encountered above.
Remove old engine, clean and paint
Replace prop shaft if required
Sit new engine in place on temporary blocks
Work out new engine beds
Build new engine beds
Toss out old controls, fuel
, shaft seals
, raw water
seacock etc and buy new ones to suit new engine.
Fit new components.
Fit new engine to new bed
Connect engine to shaft
Double check everything
FILL WITH OIL
With stop leaver pulled, and engine decompressed, turn it over by hand; if OK, turn over with starter motor
You should now have oil
pressure and raw water
flow. Don't over do this part, you don't want exhaust
to fill up with water
Turn over with starter motor
and engine compressed.
If still OK, check you are in neutral with closed throttle, release engine stop lever and try a engine start.
Now if you say all the above quickly, the task doesn't seem too huge but if you stop and think about every possible problem that might be encountered, maybe the old Bukh
will start looking pretty good.