Tilt trim valve body check balls.

[DunbarLtd]

88 force prestolite trim n tilt valve body

I have taken the valve body apart before but I forgot this time how the check balls go back in. I found a post by Jiggz and he included a diagram. Its here: https://forums.iboats.com/forum/eng...e-125-trim-motor-valve-assmbly-diagram-please

I added my own pic of how it is now. The only thing I cant remember is where the large BB goes. The spring the large BB is sitting on in the picture has the brass spacers below the spring.

Does the check ball go on top of that spring or on the one without the brass spacers? Jiggz's diagram is kinda confusing.

And dont ask me why i took it apart. It worked fine after i reassembled it last time but now I only need to know where the large BB goes. Thanks.

 

[GA_Boater]

Turn the cover so it's oriented the same jiggz's drawing and it's clear.

 

[DunbarLtd]

His drawing is backwards but Ill just keep the bearing where it is. Looks like its next to the two hex bolts. But yea his drawing is backwards kinda through me off.

And after looking at it i guess it makes sense to have the bearing on that spring. Closesup the poppet valve. The other side is a dead end. No poppet valve. Not even sure why theres a spring there. I guess some models have two poppet valves???

I could probably leave the spring out i would think. Doesnt look like its really doing anything.

 

[jerryjerry05]

If the springs there? I imagine it's needed.
This is why I don't take the pump apart.
There's nothing in there to fix.

 

[DunbarLtd]

If the springs there? I imagine it's needed.
This is why I don't take the pump apart.
There's nothing in there to fix.

I had a spool valve circlip pop out running down the lake and a spool valve and shuttle valve went with it. I was able to save one of the spool valves.

I bought a chinese pump when i first bought the boat before i knew about the spool valve seal repair. The chinese pump now is intermittent. I first filled it up and was able to trim up and down just fine. Tilting up needed some help figured it was just air in the lines. Tilt down was fine.

Then after a few cycles the trim stop working. Theres no leak down at all and i doubt air is in there as i cycled it a bunch of time. Read some posts from Rritt and he said some bad things about the chinese pumps and that they dont produce enough psi or something like that. Ill take it apart again and see whats going on. I believe thee first time i had it apart the spool valve separated for some reason. You know the part that you have to pry off to get to the seals. Perhaps it came loose again. I had it working for a minute and then it quit for some reason.

I have been looking for those spool valves but no luck. If I could find a spool valve and a shuttle valve I can get the original pump working again. If not I guess im sol. Oh well....old boats...It happens.

 

[jerryjerry05]

MOD EDIT - Use PM's.

 

[DunbarLtd]

Single ram tilt/trim. 88 force 85hp. 2 wire motor (tall skinny one mounted with 2 bolts and a nut to side of motor bracket).

4 hydraulic lines.

Its a typical one found on this site on these motors. Most of the valves on these are the same part number. But impossible to find now. MOD EDIT - Use PM's.That middle shuttle valve I may be able to use from the chinese pump but havent tried to fit it yet MOD EDIT - Use PM's.

Let me know Thanks Jerry!

 

[DunbarLtd]

I was able to get the trim to go up and down now without a problem.

The tilt will not move down. It does move up effortlessly with no hitches.

Ive isolated the tilt cylinder and it doesnt leak down so I think those seals are fine.

I have no leak down with all lines connected as well so the seals in the (chinese) valve body are doing their job. I actually replaced all the orings on relief and shuttle valves and put in some orange seals i had leftover from my oem pump repair. Ive fixed the issue of one of the spool valves separating.

The only thing I can think of is that the middle "shuttle" slider valve is sticking to one side or possibly leaking somehow.

Ive removed the outward spool valve and pulled the shuttle valve to inspect. It came out just fine with a little tug from some needle nose. The oring looks fine to me. I thought maybe the nipple on the shuttle valve was sticking into the hole of the spool valve but when tested it did not stick at all.

The inside cylinder bore of the shuttle valve is spotless. When I took it apart the first time to inspect and put it back together the tilt went up and down for a few seconds. Of course the fluid was always full. And then after a random tilt up it stuck again and would not go down. Motor whines. Switches and relays work obviously if the motor runs. It just doesnt want to lower for some reason.

Im convinced its the shuttle valve causing the problem but I dont see any evidence to support that. Is it possible the oring is too small or too big? Too big and it sticks. Too small and it bypasses (leaks). ???

Even If I do find an oem spool valve and get it back in service Id still like to figure out why this chinese pump is sticking for some reason.No wonder people hate them Super unreliable. Typical chinese junk i suppose. Nothing against the chinese by the way but darned if they dont produce some cheap stuff.

Anyways If nobody has a clue then Ill just move on. Thanks for the help everyone.

 

[jerryjerry05]

I think you said it when you said Chinese JUNK.

I'll go through the parts I have.
Then send them along.
The threads on the pump might need work??
Dunbar send me an address through a PM

Did you leave the ball bearings out when you reassembled?

GA.Boater, sorry if I did something wrong.
I wasn't selling anything , he just has to pay for the shipping in an un-usual way.
Shippings about 7$ He will need to make a donation to a local animal shelter for about 15$ for the FREE parts and shipping.

 

[GA_Boater]

Jerry - Thanks for helping a guy out, but iBoats sells replacement parts and complete pumps. That's why the policy is to urge use of PMs for private transactions and not publicly.

 

[DunbarLtd]

Completely understandable. Sorry if I infringed on the rules. I will take note for next time. Thanks for the reminder.

PM sent.

 

[DunbarLtd]

Update on this issue.

Installed some spare oem parts for the pump and its back working again.

Im not sure what the problem was with the aftermarket trim pump (valve body) but for some reason I just couldnt get it to tilt down. With the oem pump back on and the new valves in - the motor tilts and trims as it should.