1994 115 2 stroke lower unit casing cracked

[wilson]

just got back from taking the kids fishing and found a 50mm crack from the outside edge of the gearbox(prop end) heading towards the the centre of the gearbox. oil still in box and no leakage from crack is this a common fault on yamaha lower units.and could it be drilled to stop the crack moving and welded or better to replace the casing

thanks

[boats.net]

It might be welded, have the welding shop look at it to see if can be done. It does happen in hard freeze climates when water is left in it.

[wilson]

thanks for reply but adelaide does not get that cold so far its only been as low as 6 deg C this winter.

[boats.net]

May be corrosion between bearing carrier and gearcase housing.

[wilson]

Thats what the repair shop said but also to mark it and keep an eye on it
not quite sure if thats a good thing will it it get worse and leave me stranded ????

[sneak attach]

I had the same problem, took it to a repair shop who said the weld would not hold and to take a dremel tool cut a shallow grove along the crack and fill it with JB Weld. Holding great even hit a sandbar and the JB held.