POWER TRIM ON 1971 115hp MERC.

[Gordon W]

THE POWER TRIM ON MY 71 MERC. 115 HP IS IN THE RAISED POSITION THE ELECTRONIC SWITCH DOS'NT ALLOW ME TO LOWER THE MOTOR, ALTHOUGH IT STILL ENABLES ME TO RAISE THE MOTOR. CAN ANYONE PLEASE ADVISE IF THERE IS A MANUAL OVERRIDE AND HOW DO I ENGAGE THE OVERRIDE. I HAVE REPLACED THE ELECTRICAL SWITH AND SUSPECT A SOLINOID IS MY MAIN PROBLEM.

 

[Chris1956]

Re: POWER TRIM ON 1971 115hp MERC.

Open the "down" hydraulic line a bit at the pump, and the motor will slowly settle, as the oil shoots out.

 

[RB78]

Re: POWER TRIM ON 1971 115hp MERC.

This is something I also need to do Saturday. Which line is the Down line?

 

[75TowerOfPower]

Re: POWER TRIM ON 1971 115hp MERC.

Smaller since it requires less PSI and volume.

 

[Wingedwheel]

Re: POWER TRIM ON 1971 115hp MERC.

Looks like the smaller line is crimped off. Could that be your problem?

 

[79Merc80]

Re: POWER TRIM ON 1971 115hp MERC.

Do you see that "Knob" above the line that looks like it has a visegrip on it? That is the manual overide. Turn the know one way or the other (Not sure which way) to operate the tilt manually.

 

[RB78]

Re: POWER TRIM ON 1971 115hp MERC.

Do you see that "Knob" above the line that looks like it has a visegrip on it? That is the manual overide. Turn the know one way or the other (Not sure which way) to operate the tilt manually.

I've tried the knob. It did not make a difference.

 

[RB78]

Re: POWER TRIM ON 1971 115hp MERC.

Looks like the smaller line is crimped off. Could that be your problem?

I thought it might be, but it was (as I was informed) working with the line crimped as you see it. I am going to replace the unit and lines once the boat is finished. May have to do it sooner than later ...

 

[achris]

Re: POWER TRIM ON 1971 115hp MERC.

.... Which line is the Down line?

Smaller since it requires less PSI and volume.

Quite wrong. The small line is the UP line. The reason the DOWN line is larger is to reduce the back pressure when the system is running the high pressure UP circuit.

Chris............

 

[RB78]

Re: POWER TRIM ON 1971 115hp MERC.

THE POWER TRIM ON MY 71 MERC. 115 HP IS IN THE RAISED POSITION THE ELECTRONIC SWITCH DOS'NT ALLOW ME TO LOWER THE MOTOR, ALTHOUGH IT STILL ENABLES ME TO RAISE THE MOTOR. CAN ANYONE PLEASE ADVISE IF THERE IS A MANUAL OVERRIDE AND HOW DO I ENGAGE THE OVERRIDE. I HAVE REPLACED THE ELECTRICAL SWITH AND SUSPECT A SOLINOID IS MY MAIN PROBLEM.

Sorry, Gordon. Don't mean to hijack your thread.

 

[achris]

Re: POWER TRIM ON 1971 115hp MERC.

I thought it might be, but it was (as I was informed) working with the line crimped as you see it. I am going to replace the unit and lines once the boat is finished. May have to do it sooner than later ...

The system could not possibly work with that line crimped off. It's a closed system, when one side is being pressurised, the oil in the other side must flow back to the pump reservoir... Crimp a line and it will not work in either direction........

Chris.........

 

[Wingedwheel]

Re: POWER TRIM ON 1971 115hp MERC.

That knob is the reverse lock release. It only allows the motor to be raised by releasing the back-check valve. The system needs to be de-pressurized. Usually taking the lines loose will do it. I have the same system and thats how mine works.