i think my motor is blown...

[soccplayer07]

as the title suggest. I was running her on muffs this morning cleaning my carbs when she shut off suddenly (very abrupt). tried to start her again and she would not turn over. After looking the motor over i noticed a lot of metal fragments on the ground near the prop. Definitely looks a like a piston...what now??? I could cry...

93 faststrike 150hp

[RoLo]

If she's not turning over at all, the motor may have siezed-up (galled piston-ring perhaps).

Was there a good water-discharge when she was running? (pull the water pump and check the impellor)

Was the motor hot to the touch after she quit?

Roger

[soccplayer07]

normal water discharge and she was not hot to touch

[RoLo]

normal water discharge and she was not hot to touch

That might be good news.

In any case, I'd pull her apart and peek inside.

Roger

[Jmcdonald]

ouch....

[Way2slow]

How many rpm was you reving the thing?

Pull the spark plugs and see if one has metal on it or been hit (gap closed).

You can also take a little LED flex light and stick in the plug holes to look at the pistons.  Best to do this in low light/night conditions.  Makes seeing them much easier.  A small bulb that fits in the plug hole and wired to a battery works also.

It's easy enough to pull the head and look at them.

[twors]

Looks like a broken piston skirt which means the piston is probably cocked in the cylinder bore causing your abrupt shutdown you mention. Chucks of metal coming out the exhaust is not a good sign.

[Tpayneful]

Were you doing the following:

Spraying carburator cleaner in the intake when it was running?

Were you reving the motor?

The shop manual for that engine specifically states that you should never rev the outboard with the Muffs on.  Only when the lower unit is submerged in the lake or dunk tank.

The other thing is carburator cleaner doesn't have any two cycle oil mixed in with it and will destroy pistons and cylinder walls lickidy split.  Guess how I figured that one out!

[burleytog]

If you're gonna clean carbs, dribble a little SeaFoam in there.

[fishfordollars]

You can forget peaking into the engine through a plug hole. Go ahead and jerk the heads off. It's come apart.

That's piston material without a doubt. It may be possible to repair the one hole that is damaged. From the looks of the lower unit the motor has a ton of hours on it and is ready for a rebuild or powerhead replacement anyway.

If, in fact, it has a lot of hours on it just bite the bullet and do the complete powerhead. Another cylinder will be just down the road and makes no sense to repair one cylinder. While you have it down hone and re-ring the other cylinders. You're going to have to purchase a complete gasket set anyway so do it right and be done with it. New bearings, seals, rings, piston(At least one, maybe all), and a gasket set for starters if the block is even salvagable. It might not be though. Sleeving might be possible , just need to get into it and see.

I know it is expensive, but make sure you pay the extra and have a good mechanic do the job. No shade tree on this one. Could end up costing twice what it should.

FYI, the first thing that needs to be done is figure out what caused the problem. Otherwise it could happen to a new rebuild if it is a fuel or other issue outside the powerhead it's self.

Keep us updated.

Good luck,

Jack

[skunked_again]

that sucks. i hope you have some electric lakes you can fish until its put back together.