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ChampionMan,, (Fred), I know you aren't crazy about Mercs but this is just a power trim question (problem).

When I am running fast, I raise my motor to lift the bow for a better plane... after a bit the front lowers and I have to raise it again.. i know the thing is old (1983) But what could be wrong with it....?? thanks retiredguy

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Always on a bentpole pattern
Chiefretiredguy

Not try'n to speak for CM, but If you'd take out a couple hundred pounds of GREEN PUNKIN worms it might lift better!! LOL

No ol' buddy you sound like your trim is leaking down....my old '76 Johnny 115 did the same thing....it finally quit and it was so old nobody had parts for it. I put one of them CNC {I think} trim n tilt units on it....looks like as jack Plate but raised and lowered the motor just fine. I even raised the motor so that old 17' MFG Superbass would hit darn near 40MPH!!!...

Good Luck RTG CYA

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Jojo-SC Team One Lake Wonder Make'n Hawgs look like Keepers..it's Just what we do.

I agree with JoJo get rid of some of them worms, LOL!
No seriously on them old Mercs, I'm pretty sure that the trim fluid reservoir is inside the boat and is driven valves inside the unit via mechanical solenoids. Check your fluid level and top it off if low. I have a '87 135 laying out back and will check it later and get back to you.

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I'm not fluent in Idiot could you please speak slowly?

Just wondering if the oil might be contaiminated so it has reduced the viscosity allowing it to leak by. We use different viscosity hydraulic oils in some hydraulic applications to control external leaks and what I call internal hemrages. Boy my spelling looks like it really sucks this morning......LOL. RM

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God Bless America, Land that I love

It's only a gambling problem if you lose

Thanks for all the replies...

Guess I should have told you what I have already done... Yes the motor/pump is inside the boat. I use 30 motor oil for the resevoir.

After putting up with it for a couple years, I took the whole unit out so I could see it without disconnecting anything. I poured the oil out and filled the darn thing with power-stearing (with stop leak) and put it back in place. I did this because I felt if there were any rubber or plastic that was causing the problem the this may repair it.

After a couple of months it seemed to be getting better and the motor/pump was having to work hard to raise/lower the motor. So again, I took it out and poured that oil out and refilled it with 30 wt motor oil.

The stop-leak doesn't appear to have done anything for the unit (good or bad).

I have worked with hydralic pumps and the actuators that causes the "pistons" to move and cause the action to reverse or go up or go down, whatever. They really are not that complicated but I don't think I am ready to take it apart... after all it is still working, just not like it should.... thanks retiredguy

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Always on a bentpole pattern
Chiefretiredguy

RTG, I don't think I'd use motor oil in the unit. They make hydraulic oil with about a 20 weight viscosity. Motor oil doesn't have the right additives for a hydraulic system. Not sure what that means exactly but there is a difference. RM

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God Bless America, Land that I love

It's only a gambling problem if you lose

What is the correct fluid to put in a power trim resvoir?

Thanks,

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Dave
(Michigander at heart! Go Red Wings!)

I have seen Tilt and Trim Oil in bottles. Not sure if it is something special or what. I have used John Deere hydraulic oil in my old 75 HP Johnson many years ago and it seemed to do fine. If I had to add or change my newer motor fluid I would just buy the real stuff at a dealer. RM

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God Bless America, Land that I love

It's only a gambling problem if you lose

The old Merc run 30wt motor oil in them. I run 10w30 in mine it the winter. RTG fill with oil and trim it up and down a few times. This gets the air out.

catfish

catfish is right............my neighbor has an old late 70's to early 80's Merc on a old orange tri-hull bass boat and it calls for 30wt ENGINE oil........the reason I know is he's trim/tilt went out last year on it.......RTG if memory serves me correct he couldn't find parts for it either, had to buy a Parts Motor that had a blown powerhead and robbed the t-n-t off it. I can't remember what year model it was but I tihnk it's early 80's with inside mounted reservoir and a 'Tower of Power' powerhead ........sounds just like yours from what I remember.

Good Luck !
-Stephen

RTG, don't you let these guys talk you into taking those Green Pumpkin worms out of that boat. You may need to do something with the trim but those worms coming out of the boat ain't gonna help anything except them not having to fish against you and those baits

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Life Jackets and Kill switch's save lives! Soft baits catch fish softer baits catch more fish!
I carry a gun cause a cop is to heavy and when seconds count the police are only minutes away!!

RG, Call me 864-934-7985 checked the unit today and if you have a single ram (like most Merc's) it should work.

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I'm not fluent in Idiot could you please speak slowly?

Thanks fred, will do tomorrow... any time in particular??? retiredguy

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Always on a bentpole pattern
Chiefretiredguy

after 3 PM is good.

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I'm not fluent in Idiot could you please speak slowly?

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it takes skill to catch catfish bass fishin