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power tilt & trim issues 1984 235hp

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bruingtonbeagles

New member
well guys i am still working on my newly aquired 1984 johnson 235.took the boat out today and had same results as first trip.first trip out motor would not trim up under thottle,stop the boat and would trim fine.trim motor up and then accelerate and motor would slam back down to the transom.thought it was a bad trim & tilt unit so i purchased another motor with a trim & tilt unit that appeared to work just fine.installed new trim unit took the boat out today and same thing,will not trim up under acceleration.what is going on here?this trim unit slams back down under acceleration like the first one...not sure if this means anything but the motor is on a boat that used to be a inboard that was converted to a outboard.the outboard is on a jack plate that sits about 3-feet off the back of the transom.
 
Re: power tilt & trim issues

The tilt/trim units have just 15° of trim. This would be from the full down trim position, and from there up to the 15° mark. While underway, the unit will not travel any further up from that degree mark...... which is what sounds like you're encountering. If so, that refusual to travel any further upward is normal.
 
Re: power tilt & trim issues

thanks joe but why will the trim go all the way up when not under power?and why does the motor slam back down if you trim the motor up before you take off?i know the bass boat i just sold had a johnson 150 ficht motor 1999 model that would trim up under power untill the motor came out of the water if you let it...another question is that the adjustment pin is missing from the motor,where there is like 6 different holes you can stick the pin in to controll the angle of the motor,if i put a pin in the upper hole so the motor under acceleration does not go all the way down can i pick up some speed by manually trimming the motor this way?thank you for your time mr reeves.
 
Re: power tilt & trim issues

If anyone had a PTT unit that would trim up all the way while under power, I'd say that something is terribly amiss with that unit. That just doesn't happen.

The 15° trim movement is slower than the remaining tilt movement..... easy to tell when one mode transfers to the other. If the engine is tilted up beyond that 15° area and you apply power to the engine in gear, the engine will slam down to the extended trim rams..... normal.

Now, with the same scenario, if the engine slams down to the trim rams THEN forces the trim rams all the way down, there is a problem with the PTT unit.

The object of having a PTT assdmbly is that the tillt reverse lock pin (engine angle) is not needed. However, if a problem actually exists with a PTT unit and it does slam all the way into the transom, the pin will be needed to obtain the proper engine attack angle until the PTT unit problem is corrected.
 
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