leaving outboard tilted or not ?

[aerobat]

a buddy in our marina bought a new ( slightly used ) boat with a 2016 yamaha 100hp four stroke and fuel injection - btw a very nice outboard , silent , smooth running , nice power , turn key only cold or hot.

he leaves the boat in water all the season and we discussed if its a good or bad idea to fully tilt the motor when not in use .

obviously good because no fouling of the lower unit sitting in water all the season but fully tilted it looks like rain can enter the air intake and i,m not sure about the oil in the oil pan when fully tilted .

it doesnt matter or better leaving it in the down position ?

best regards

 

[tpenfield]

For marine growth and galvanic corrosion concerns, tilt it up when not in use.

 

[Sea Rider]

If water entering through the cowl bothers you when motor is fully tilted up buy a motor cover and voilá...

Happy Boating

 

[dingbat]

Misguided concerns.
The engine is designed to be hosed down after use

Tilt it up and forget it. You lower unit will appreciate your effort.

 

[aerobat]

thank you much for the good hints !

 

[Chris1956]

Does any part of the transom bracket or gearcase stay in the water when tilted? If so, you need anode protection for the motor. Most transom brackets have an anode on their bases. If there is one there maintain it. If not, you need to add one or do something to get an anode into the water.

 

[QBhoy]

No problems tilting up and avoiding growth...but like all hydraulic ram based systems....tilt it up fully then back it off the other way a tiny nudge. Not great to leave a ram fully extended or retracted at the extreme end of travel to be honest.

 

[dingbat]

but like all hydraulic ram based systems....tilt it up fully then back it off the other way a tiny nudge. Not great to leave a ram fully extended or retracted at the extreme end of travel to be honest.

Forty years of industrial hydraulic automation and controls. Never heard of such a thing.

Please explain the logic behind it

 

[matt167]

in the tractor/ equipment world the manufactures recommend relaxing the hydraulics after shut down ( give the valves a wiggle ) However it is more for safety . You can't do that with outboard trim, and if you could the motor would just end up back in the water

 

[QBhoy]

Forty years of industrial hydraulic automation and controls. Never heard of such a thing.

Please explain the logic behind it

I’ve always done this with any hydraulic rams. Never good to fully extend a ram to its limit long term. Always best practice to back off a touch. Apart from that...if a ram and its seal is constantly left in one position, you will eventually loose its sealing surface over the years.
Surprised you’ve never heard of it. Most leaking trim rams on outdrives and outboards are as a result of this very thing. Next time you hear of a local boat having to get the rams redone...look at the ram surface. It will usually be slightly marked at its extreme ends.
Also when they are hard extended or in at their limit, it takes more load to release them on occasion, should they slightly stick.

 

[jimmbo]

Sounds like my dad telling me never turn the Bass and Treble knobs all the way clockwise.

As for power tilt and trim. OMC use to spec that when trailering, to lift the motor, engage the Trailer lock, then retract the trim rams fully into the housing till they bottomed out