SHOWA trim tilt unit bebuild

[boscoe99]

Does item 7 show the pin you are looking for?

[Towboat1]

Thanks boscoe99, I've seen this diagram and I have the two valve assembly shown in the correct holes ! But there is another pin type piece in the middle hole below the down valve assembly that isn't shown on any diagram I've seen .
I'm almost positive the valve body and the cylinder housing were put together the way it came apart BUT this won't be the first time I screwed up so I'm taking it apart again to check !!!
The only ball that was removed is the one in the tube that went in the top hole of five between the two halves , that's still in place . From what I see the valve assembly that controls the down motion is the big one with little screens on both ends , so I'm going to start there !! Any suggestions ?

Thanks !

[boscoe99]

I have looked and cannot see this mystery ball either.

Must be like baby pidgeons. You know they exist but nobody ever sees one.

No one has ever seen a baby crow either. When you see a crow it is all done growed up.

[pstephens46]

I have looked and cannot see this mystery ball either.

Must be like baby pidgeons. You know they exist but nobody ever sees one.

[Towboat1]

LOL!! I believe ya rodbolt17 , I spent the evening looking through the Yamaha repair manual for the 2001 150hp . Crazy how much detail it lacks for this unit , I've ordered more o-ring and plan on taking the unit apart again tonight . It just kicks my butt not having anything to reference , I didn't take the pump apart only removed the screen while working with the pump. All the valve assemblies went back in their respective holes as best as I could remember.
Can you give me an idea where to start looking ?
the unit is trimming and tilting up fine all the way to where it binds
to lower it I have to lift some weight off the tilt piston and it will start moving down in ****ing motions.
When it hits the trim rams it still goes down with ****ing motion.

Any suggestions !!

Thanks, Mike

[rodbolt17]

one more try.
it is NOT an air or bleeding issue.

there is a valve that goes in a hole on the pump housing.
leave the ball out and it goes stupid.
ball is NOT shown on the parts diagram nor the SM.

[pstephens46]

Find a friend and try manually operating up and down. It is not as heavy as you think. Loosen manual release and lift up. Tighten. Then open screw very slowly to let engine down. Don't let it drop! Cycle a few times. Check fluid level after to make sure it is level with hole. Excess drips out. This should bleed it. If that doesn't work, you may have to disassemble.

[Towboat1]

rodbolt17 I had one heck of a time separating the Valve assembly from the tilt trim housing ( long bolt was stuck big time) to replace the O-rings . so very possibly something got past me in the reassembly process . I cannot find any diagram to use as reference to make sure I have everything back correctly . I did try and keep track of all the parts as I took it apart, can you verify what I thought I saw in there ?
There are five holes where fluid can pass between the housing and the pump , there of the holes had something in them
The very top hole on the right side had the check valve assembly ( tube with a ball )held in inside with a pin. I put that back in the hole ball facing the housing
The hole directly under that had the down relief valve assembly (2 screens, a o-ring and the valve) that would only go in one way .
The third and very bottom hole had a pin looking thing in it ( I've yet to see this piece shown in any diagram )
The other two hole had noting in them !!
Can you picture this and does it sound correct ?

Thanks, Mike

[Inmyopinion]

Service manual

If you download the Scribed app you can view the factory Yamaha F150 hp service manual for free during trial periode. Tilt and trim repair/rebuild is located in section 7. They also have manuals for other models.

[rodbolt17]

fill the cylinders while assembling.
from there it is self bleeding.
an air lock is not your issue.
either a part got left out or it is assembled incorrectly.

I cannot scan things here.
I do have 3 copy's of the drive train book from various years.

been doing Yamaha courses for about 17 yrs.

[99yam40]

I bought a spanner wrench from marine tech tools , works great but pricy .
Yes the procedure I have done is raise the motor till it binds, connected a length of hose to the reservoir and a bottle of ATF and held the up button till it stop drawing ATF into the reservoir ! Then I open the manual release so fluid would spray out and ran the motor up and down 3 or 4 times . Did this twice , my concern is if there is air in the tilt ram tube its above the reservoir how will I get the air to travel to the reservoir to be vented out ?

Mike

I do not know.
That may have something to do with filling things as you put them together.
maybe Rod will post again and say the best way to bleed that unit.

some of the other units you open the manual release and move motor up and down by hand ,checking and filling reservoir as you go

[Tony Harper]

actually I do.
it is in the drive train class room manual.
I have a few just no way to post them.
let me see what I can do.

If possible, I would like to a copy too please Rodbolt, I have had a similar problem previously, I did find that when it was locked up & would not go down with trim button activation, I had to release manual release screw momentarily & then entire system works correctly again, then intermittantly it would lock in the full tilt up position again, once manual release is cracked all is good again.
Tony

[Towboat1]

I bought a spanner wrench from marine tech tools , works great but pricy .
Yes the procedure I have done is raise the motor till it binds, connected a length of hose to the reservoir and a bottle of ATF and held the up button till it stop drawing ATF into the reservoir ! Then I open the manual release so fluid would spray out and ran the motor up and down 3 or 4 times . Did this twice , my concern is if there is air in the tilt ram tube its above the reservoir how will I get the air to travel to the reservoir to be vented out ?

Mike

[99yam40]

I have never done one, but when I read in some manuals they talked about filling some of the cylinders/things up as you put them back together

[pstephens46]

Yes. You still may still have air in the system. Did you use the manual release as part of the bleeding process?