Yamaha ox66 question

[SkunkBoat]

So I have the trim apart. Looking at the pistons of the port motor, they are pitted where they are normally exposed. Over the winter there was seepage to the point where they needed a little squirt of hydraulic fluid in order to raise all the way.
I believe the seepage is due to the motors being down all winter. In down position the pits are in the seal. During the season, the motors will be up most of the time (at the dock).

new pistons are $230 apiece.

So my questions for the motor heads;

Has anyone ever filled the pits with JBweld and sanded smooth?

Would I be better off just replacing seals and topping off fluid during the season.

Should I bite the $500 nut and get it over with. Mind you, I'm hoping to scrape together a repower next winter so I don't want to do more than necessary.

[SkunkBoat]

I did my water pumps and when testing I also had a problem with overheating alarm on one engine.
Flow looked good (same) on both engines. We did use a Y connector and put water to the ear muffs and to the flush port.

troubleshooting with thermometer gun found one side of engine too hot 190 vs 120. Checked tstat, it was open but didn't look wet.

Long story short, stuck the engine in an old dock box and filled 'er up.....ran like a charm...

[spareparts]

Originally Posted by SkunkBoat

So I have the trim apart. Looking at the pistons of the port motor, they are pitted where they are normally exposed. Over the winter there was seepage to the point where they needed a little squirt of hydraulic fluid in order to raise all the way.
I believe the seepage is due to the motors being down all winter. In down position the pits are in the seal. During the season, the motors will be up most of the time (at the dock).

new pistons are $230 apiece.

So my questions for the motor heads;

Has anyone ever filled the pits with JBweld and sanded smooth?

Would I be better off just replacing seals and topping off fluid during the season.

Should I bite the $500 nut and get it over with. Mind you, I'm hoping to scrape together a repower next winter so I don't want to do more than necessary.

look for a used freshwater trim unit, just replace the whole thing. Those motors are getting some age on them and not as popular as they once were, so parts are starting to show up

[SkunkBoat]

We ended up doing the JBweld thing and it works surprisingly good.

And the upper gear oil seals became a problem. Could not get the housings loose on either motor. Did not want to break anything so we took the spring garter off the new seals and put them on the old seals and buttoned them up.

Our new motto is "Do no harm!"

Really can't get sucked into everything these 17 year old motors need.

Yesterday I changed spark plugs & fuel filters. Found that in one motor the filter element was upside down and doing nothing. Don't know if it was like that when I bought it or if my brother was looking at it and put it back wrong.
Not a big deal since I have 10 micron Filter/separators in line.

Cleaned the O2 sensors. They were not too bad.


Oh and my 2 cents about Yamaha water pump service.....give me a Suzuki...4 parts...impellor,key,plate,gasket...

Getting ready to launch Saturday afternoon.

[THEFERMANATOR]

Originally Posted by spareparts

look for a used freshwater trim unit, just replace the whole thing. Those motors are getting some age on them and not as popular as they once were, so parts are starting to show up

I actually have one I think would work.