Removal of Yanmar 1gm10

[Laundryman]

Advice please, I plan to remove the Yanmar 1gm10 to recondition. The boat is in the water. Do i remove it with gearbox attached or not. I will continue to use the boat with outboard power during 2009 . How do i stop the shaft dropping out? As i will be lifting out soon to antifoul, should i remove the prop? Thanks

 

[sailorman]

break / undo the 1/2 coupling on the shaft. the shaft cannot then "fall-out" make sure that if it does drop aft it doesnt foul the rudder a set of mole grips might do the job + stop it spinning.
disconnect all lines cables & lift out

 

[fastjedi]

Mmmm! .... I wouldn't leave the gearbox in on the grounds that having 25kg of gearbox on the end of the shaft isn't going to help stabiliise the shaft? I guess a jubilee clip (maybe two!!) around the shaft next to the seal might help. It will probably need something to support the shaft at the gearbox end too depending on the length of shaft showing inside the boat? Maybe a chunk of wood with a hole in it fixed to the engine bed?

 

[bendyone]

You need to undo the coupling and remove the engine, then I would make up a steel bracket fixed to the back 2 engine beds to bolt the coupling to.
There will be a lot of force from the prop pulling the shaft out when sailing.

 

[steve28]

if you have the option of drying out to remove the prop it would be easier as you only need to put clips on the shaft inside and out. This would eliminate any need for fancy holding brackets.

 

[johndove]

Hi
Fitted a 1GM before,
Undo coupling bolts where coupling joins gearbox, but leave coupling on shaft, No chance of shaft falling out.

Undo the four engine mounts big nuts (top of jacks), so less to line up when refitting,
Exsaust, 2 fuel pipes, engine controls, water hose and battery wires, and unplug the engine instruments.

Lift out with gearbox, can use boom as crane.

Pull shaft fwd and tie rope round shaft coupling onto engine mounts to stop shaft sliding back.

 

[Spuddy]

I took a !gm out of mine last summer without removing gearbox. Used a fence post across cockpit coamings + mainsheet for initial lift. Two of us then got it onto cockpit seats level and then onto hefty ply ramp down to pontoon. Rope strop around lifting bracket with a lump of wood thro it helped. My freeboard is low so ramp wasn't steep. Had a halyard tied off to engine just in case it headed overboard. Removing gearbox is a good idea - we were seeing how heavy it was and just kept going.

 

[ShipsWoofy]

Taking the box off seems to be a great deal of extra unnecessary work IMO.

I lifted mine on the boom, raised up to 60° act like a derrick. But then I am an ex trawler dweller so this seemed quite a normal method of lifting heavy stuff.