Hunter 37-cutter Owner Modifications and Upgrades

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Yanmar repower-final

posted 10-07-2008 by Ed Schenck

Well almost. In this photo the engine is bolted and aligned. From the start of lifting the engine out of the crate to taking this picture was about 90 minutes.

As you can see there is no sign of the water separator or Racor filter. Plus exhaust, wiring, shift and fuel cables, and water heater.

This is not a project for the faint of heart. And you had better be Clyde and take Bonnie with you. However all my costs were parts related, absolutely no labor charges except the welding of the mounts. Since I purchased the Yanmar from the marina the lifing out and in was part of the deal.

Engine installed.

Here is the new Flex-O-Fold 3-blade. I was really happy with my 2-blade on the 2QM20. So I thought I would give the new 3YM30 something sweet to spin. Along with a nice new stainless shaft and new cutless bearing.

I hope I did not make a mistake in not replacing the strut. Years ago I rebedded with big bolts and 5200. I could not face tackling that.

Power needs a prop.

This is what I saw just after dropping the engine on the new mounts. Cannot tell you how good it feels to see your measurements work out this well. A half turn on each of the front mounts is all that I did after sliding the shaft against the shaft saver. The bolts went in by hand.

While the shaft was still outside the boat I restuffed the packing in the box. Wow, what a difference from working inside the boat. I got two big rings of 1/4 GFO packing in there. The GFO packing can be adjusted for no drip. I also replaced the stuffing box hose with a new and shorter one. Going shorter has two advantages. One is less hose to twist and fail. The second is that you get more room to work on the shaft should you have to repack.

Shaft saver.

Heres the new cutless bearing being pressed in. Only seven bucks to rent the press. Of course this is after spending hundreds for the shaft, bearing, keys, and facing and installing the old coupler.

New cutless bearing.

The new front mount on the engine right before lifting off the shipping rails. Note that this raises the engine another 1/2 inch. It was almost too much such that I have almost no down adjustment room in the mount bolt. This was taken in to account because I knew exactly how high the shaft center was above the engine rails. This height thing is the key measurement because you only get about 1/2 of adjustment on those engine mounts.

Front mount modified.

This mount only uses 1/4 inch steel so not as much adjustment height is lost. One problem in my original design was the closeness of the end of the original mount to the new hole. There was not enough room for the washer/nut. So back I went to have them mill out a semi-circle.

That about does it. One more week and it will be splash time. I cannot wait to fire that baby up.

Rear engine mount modified.

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