1988 force 125 tilt/trim

[aboutmidnight]

I have a 1988 bayliner with force 125hp, the tilt/trim worked last year, i found it not working this year. I found water in hydraulic pump, I tore it all down and replace "o" rings cleaned all the water out and replaced with "atf"
fluid but the motor still will not go up and I have no trim tab either, can hear the motor running but no pressure. does anyone have any ideas. HELP!

 

[RRitt]

Re: 1988 force 125 tilt/trim

1) you should not use ATF in a 1988 TnT. Use non-detergent motor oil or hydraulic oil. At your age, ATF will blow out your hydraulic piston rings within a few years.

2) you may have simply not properly seated the valve body into the resevoir.

3) you may have left out a part, put it together incorrectly, not shimmed the pressure setting, not replaced a critical seal, or left a bit of debris. Valve bodies are a relatively precise balance of all the components. Having one thing wrong can cascade into other parts. You need to be precise, meticulous, and immaculate when working of your VBR.

 

[seagull369]

Re: 1988 force 125 tilt/trim

Was searching and came up with this post. Just had another ques or 2 to ask on this topic. if that's all right.

1st one is, My clymer's says I should add 10w-30 (or 40) non-detergent oil to my tilt/trim thing there. Would I be ok if I just used 30 weight in the non? I don't recall seeing non-detergent muti-weight oils in my normal shopping routine so that's why I'm asking.

Other question was is there any bleeding procedure when you fill the unit when it's been paritally drained? I had to disassemble the motor/ pump on my '86 125hp cuz it got hung up and I lost a good amt. of oil in the process (actually it pissed all over my leg!).

Thanks!

 

[RRitt]

Re: 1988 force 125 tilt/trim

30w non-detergent is the best overall fluid to use. iso32 hydraulic oil is hard to find except in 5gallon buckets and some 1987-1992 system will buck if the fluid is too thin. Your system will last longer with oil than ATF. So the best overall choice is the one fluid that works in every system. 30W non-detergent. But don't mix oil with ATF. If your existing fluid is red then you must continue using ATF.

systems are self bleeding. simply top it off and use it. With every cycle a little more air gets pushed out.