2010 merc 50 2stroke seized while running

[Junglegeorge]

Hey guys I had a situation I started 2 outings ago. I was running WOT and heard what sounded like a bearing squeaking I could not know for sure . I rowed back to launch and trailered it home. Too it out again to try and re create at the launch by my house . Couldn't do it. No noise this time as before when it was squeaking at idle and noise sped up when o throttled up. Took it out fishing and no noise again, took it slow for 20 minutes , no problems , ran hard WOT and about 2 mins I heard what sounded like bolts rattling in a pop can . Motor lost power and slowly shut off. Tried to start and it turned over and putted out after 2 seconds. Tried again and motor was stuck. I could not move the flywheel . The block was cool not even warm really. Motor was peeing , water pump was warm, but not even close to hot.
What happened ?!

Thanks for any help
Jungle George

 

[racerone]

Checked lower unit oil ??--------Oil injection working ?------------Tested it ?-----------Sounds like you now have failed bearings and major $$$ repairs.------What do sparkplugs look like ?

 

[Junglegeorge]

Spark plugs fine , lower unit is a jet drive and I have not ruled that out. Oil injection was working . What bearing can just go bad like that ? And why ?

 

[Junglegeorge]

What is considered major $$$ repair ?

 

[Junglegeorge]

Maybe a parts diagram of what bearing are around the driveshaft would help see what could bind this motor up?

 

[Mi duckdown]

Do a compression check first and reply back

 

[Junglegeorge]

Bottom cyclinder is toast. Metal on the spark plug. Guy quoted me 2500-3000 for a rebuilt powerhead with 1 year warranty. I don't understand how this can just all of a sudden happen. Any thoughts ?

 

[racerone]

You said sparkplugs were fine at one point !---And I would say $3000 is major repairs.

 

[tommarvin]

I bet the oil injection filter is plugged. Tear it apart take the cylinder block to a fair priced machine shop, bore the bad cylinder, then hone all cylinders with a straight stone hone, re ring the old pistons, now put it back together.

Free outboard service manuals at www baotinfo.no/lib/library, click on your make motor, find your service manual, watch YouTube videos on rebuilding outboards.

Now what do you think of oil injected outboards?

 

[Faztbullet]

I bet the oil injection filter is plugged

?????? What filter??????

 

[fhhuber]

Oil injection failure resulting in catastrophic engine failure.
Kills a lot of the older Johnson VRO engines. Yours has a different injector pump, but the same basic things cause loss of oil..

forgetting to fill the oil tank
clogged oil injection system
Failed pump (for any of a few reasons)

And as is usually the case, the injection alarm fails or goes off just in time for the engine to be destroyed.

 

[Faztbullet]

Oil failures rarely damage just one cylinder....