Getting the block off

[Dan Gurney]

Hello all,

I need some more advice from the Yam 2 stroke people please.

I've started on trying to get at my top mounts which need replacing (as covered here)

I've taken the gearbox off, and the carbs. I've disconnected everything which connected the block to the rest of the engine/boat (gear and throttle linkages, electrics etc). I've also undone the bolts that run around the base of the block.

As you can see I've sheared one of the bolts off, but I'm fairly sure I can get it out if I can get the block off and apply a set of mole grips to the problem (it ws turnign and coming out, it was just a very long bolt with only the last inch or so threaded so a lot of torque on the head.

With the bolts around the base gone, should it lift off? I've tried it myself but figure an engine crane would be a better bet and just want to check that I'm not missing something.

[Davie]

Put the 9th bolt, the one in the centre at the rear of your engine back in but leave 3 or 4 threads showing. Put a socket under it as a fulcrum and lever it up with a bar to break the gasket seal.

[Dan Gurney]

Originally Posted by Davie

Put the 9th bolt, the one in the centre at the rear of your engine back in but leave 3 or 4 threads showing. Put a socket under it as a fulcrum and lever it up with a bar to break the gasket seal.

Excellent tip; worked a treat. Unfortunately the sheared bolt if gripping just enough to stop me lifting the head off. So engine crane it is... hopefully that, plus a little gentle encouragement with a parallel punch will get her off!

[Dan Gurney]

So I managed to get the power head off the other day, no bolts left in the block, which is nice. One odd thing was that in the bottom part of the cowling after removal, I came across two little loose ball bearings. A mm, may be two , across. I can't figure out where they've come from. Any ideas?

[Davie]

Neutral detent ball.

[Dan Gurney]

Originally Posted by Davie

Neutral detent ball.

ah yes, i see it in the diag now. ta.