Locked Outboard.-

[Sea Rider]

A friend of mine has this 2 strokes 15 HP-OB, last time out he couldn't pull the rope to start it. A tree shade pseudo mechanic told him it was caused by low use along excessive salt buid up on internal crankshaft 's upper and lower bearings and oil seals which is out of this world fantasy as this OB has never been submerged in salt water. Told him that it could be due to improper fuel/oil mixture. The issue is that he newer runs it past plane rpm and doesn't recall if adding sufficient 2 strokes oil on last tank refill.

If it were my OB would have removed starter assy, both plugs, apply an overdose of W40 on both cylinders while OB laid at fully horizontal position for product to penetrate rings well for some time and then rotate flywheel by hand bit by bit to both sides for rings to cede till fully operational.



Instead let pseudo mechanic take OB to his shop, the guy has dismantled the whole powerhead to clean the supposedly salt issues. Seems have assembled powerhead with old removed gaskets which is a must not do as are already deformed. Would not be surprised if the guy put silicone to sit crank case's gaskets back again...

Tomorrow will have a serous talk with this guy about what he's done to unlock the OB as my lawyer friend doesn't know anything about OB's, just that needs fuel and oil and voilá. Just in case will run it with fresh fuel and required 2 strokes oil amount and not use what's been already poured into fuel tank that could be counterproductive and lock OB back again.

Do you guys buy this mentioned scenario ?

Happy Boating

 

[pvanv]

What do the conn rods go to? It's a pressed crank. I don't see any salt. Probably ran without oil. I would unlock it as you suggested first.

 

[garbageguy]

... as my lawyer friend doesn't know anything about OB's...

good one

 

[km1125]

Don't think I'd use WD-40, but I like your initial approach to the problem rather than the other guys.

In place of WD-40, I've used transmission fluid

 

[Sea Rider]

Don't think I'd use WD-40, but I like your initial approach to the problem rather than the other guys.

In place of WD-40, I've used transmission fluid

Have seen this issue before in other OB's while piston was lightly seized on cylinder wall, WD-40 applied as mentioned did the trick. Transmission oil being thin (SAE 10-15) is still thick compared to WD-40, won't be of much help. This particular case is a much different scenario. Will post latter what was found to take in serious consideration.

Happy Boating

 

[Sea Rider]

Much different scenario,-

FIrstly it’s not a 2 strokes Tohatsu, it's 15-HP Yam OB which lives moored in a marina all year long , lower leg is hardly raised horizontally, most of the time remains at a vertical position. OB was never flushed with fresh water after salt use from out of the box, has very low hours at the most 100 worked hours.

The locked issue was due to having too much salt layers, crusts inside crankshaft head base (4) and drive shaft (2) where they meet with lower crankshaft (1) To stay simple with much less work along saving some cash was all about removing powerhead from base, removing 3 lower bolts that secures head to lower crankcase, clean well all salt crusts found inside head base and head's protruding tube (3) where drive shaft passes and spins inside.



Put an overdose of good marine grease inside head, tube internals and upper drive shaft splines and assemble back. Mechanic replaced the impeller for a new one. The maintenance bill was around $ 200.00, included impeller, base gasket and hand labor, when it should have been way less if only the lower leg was removed to remove base, clean, grease well and assembled back again. You know mechanics, always like going for more than need to go for to make a more succulent profit.

What find out of place is that this 2015 Yam doesn’t have side lower water intakes, just the under Anticav Plate water screen found on many different portable/medium size different brands Ob’s. Need to flush that 15 on a barrel, for that issue will simply not buy such an OB, for me flushing with ear muffs is the way to go.

This particular case where OB was never flushed with fresh water along lower leg remaining sitting at a vertical position contributed for this scenario to happen. Hope that the mechanic has put an overdose of excellent marine grease to avoid drive shaft lock in the near future.

Be aware that this scenario can happen to any OB brand OB used constantly where crankcase use a lower crankshaft head if stored and not flushed afterwords salt water use...

Happy Boating