S200TXRX trim/tilt problem???

[iltfish1]

Hi guys- Seems that I have developed a problem with my trim/tilt on my Yammie. It is a 1999 S200TXRX.When engine is under load (on plane), the engine seems to drop down from original trimmed position. I am not able to trim it back up while running. Once I pull power back and come off plane, I am able to trim engine correctly.But once back on plane, it will drop back down. I have no problem raising or lowering engine when in slip.
Again, problem only appears when under load. I have looked at the piston seals from above and do not see any obvious leaks. As boat is slipped at a marina, any work like checking fluid levels or changing seals will require me to pull the boat out of the water. Which I have no problem doing.
I am just trying to narrow down where this may be coming from? Being that there is no visible fluid externally, could I be looking at an internal bypass of some sort?
If anyone has any ideas on how to isolate this problem, I would greatly appreciate it

[TownsendsFJR1300]

Make sure the manual valve, part #21 below, is snug
, clockwise to tighten.

If its loose, it will bleed down (as designed-and won't leak fluid)

1999 SX200TXRX Yamaha Outboard POWER TRIM TILT ASSY 2 Diagram and Parts

You can access the screw thru the port side bracket. There should an arrow imprinted on the bracket..

[TownsendsFJR1300]

Any updates??

[iltfish1]

Not yet. Won't be able to check until weekend. I can't imagine that the manual relief would back out by itself, but I will check it out. Normally, those things are super tight unless you exercise them a few times per year.
Thanks for the suggestion.

[TownsendsFJR1300]

Yepper, just curious.. Tks and good luck.

[iltfish1]

Relief valve was tight. In fact, it seems frozen as I can't loosen it either. But that's something that I will have to address when/if I pull the boat to get some better leverage.
Reexamined piston seals from above with no leaks noted while actuating motor up and down several cycles.
Possibly an internal seal bypass?????

[Poorsche]

FYI -- was unable to loosen the Manual Relief valve on my Starboard engine because the screwdriver slot got wallowed out from use of a small screw driver or sloppy work on my part.

In any case -- if that happens to you make sure the screwdriver you use fits tightly in the the slot or you make an unrecoverable mess and that valve cost $137 !! The maintenance manual says somewhere to open and close that valve several times a year (with the right screwdriver) !!

[iltfish1]

Funny thing is that I did exercise the valve in the Spring before I put the boat in the water.
Back to my original problem...any thoughts?

[Poorsche]

I SOAKED THE SLOTTED AREA WITH FLUID FILM (a rust preventative and penetrant) and let it sit over nite, I taped it with a screwdriver a few times to help the Fluid Film move down the threads. I got a BIG straight blade screwdriver that completely filled the slot and used a pair of pliers on the screwdriver for leverage -- it took some grunting but it finally rotated.

The part is expensive and a PITA to replace so be cautious -- if I could get it done you can

[TownsendsFJR1300]

I SOAKED THE SLOTTED AREA WITH FLUID FILM (a rust preventative and penetrant) and let it sit over nite, I taped it with a screwdriver a few times to help the Fluid Film move down the threads. I got a BIG straight blade screwdriver that completely filled the slot and used a pair of pliers on the screwdriver for leverage -- it took some grunting but it finally rotated.

The part is expensive and a PITA to replace so be cautious -- if I could get it done you can

So is the trim/tilt staying up now (while underway) after loosening and tightening the valve?

BTW, this tool (or similar) is a MUST have in any tool box and would make that job MUCH easier..:

http://www.sears.com/craftsman-impac...5&AID=11042411

[Poorsche]

This tool (or similar) is a MUST have in any tool box and would make that job MUCH easier..:

http://www.sears.com/craftsman-impac...5&AID=11042411

I got same tool at Northern Tool for $12.99 -- FYI

[TownsendsFJR1300]

I got same tool at Northern Tool for $12.99 -- FYI

That would have worked easier with virtually no chance of buggering up the head (with the correct fitting bit).

I don't remember where I got mine. Its at least 3 decades old and still working just fine..

Does the engine stay trimmed up now once underway?

[iltfish1]

I was not able to move the valve either way. The engine still drops down when running. I can trim up when not on plane, but as soon as I throttle up the engine drops down.

[TownsendsFJR1300]

Yep, if that valve is tight, something inside is not good..

Rodbolt should be able to help.

Paging Mr Rodbolt!

[rodbolt17]

that is a 64E unit, also known as the showa.

leakdown can be
up main valve
manual valve
thermal valve
trim piston orings
free piston orings.
take your pick .