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Tilt motor problem '1977 175hp v6 Johnson

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Hi all,

I have a question for anyone who can help. I have an old 1977 175hp V6 Johnson. The question is .. Should I be reading continuity between any combination of the 3 wires going to the tilt motor. The reason I ask is that I was testing the tilt, it went up ok but only partly down as though it was stuck, the whining noise from it sort of confirmed it was stuck. So I left it for about a half hour and tried again, but on the second try, the indications where there was a dead short ... ie arcing on the battery poles

Any help would be appreciated.

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Re: Tilt motor problem '77 175hp v6 Johnson

Continuity via a ohm meter should exist between the PTT electric motor Black wire and either of the other two Green (up) or Blue (Dn) wires.

Best to keep arcing problems away from the battery. Batteries explode fairly easily when arcing is close by.

If this arcing existed as soon as you tried to connect a battery terminal (no PTT switch engaged), something is definitely shorted, a switch left on, something!

On that unit, the up mode voltage is directed to the PTT electric motor via a solenoid as the power demand is quite high in that up mode. The down mode voltage is applied to the PTT electric motor directly from the PTT switch as gravity is a factor helping in the down mode.

With small jumper wires attached as stated below, raise the engine to its full height, then fill the reservoir to overflowing. Replace the fill screw.

Having the three (3) PTT electrical wires disconnected from the junction box wiring terminal strip, using jumper wires, attach the negative battery cable to the PTT black wire, then alternatively with another jumper wire attached to the battery positive cable, touch the PTT motor Green (up) wire, then the Blue (down) wire. The unit should rise then lower.

If all is well, raise the engine again and top off the reservoir. Let us know what you find.
 
Re: Tilt motor problem '77 175hp v6 Johnson

Thank you for your reply,

The arcing occurs at the battery terminals when the respective wires are applied directly to the battery, switches, solenoid etc bypassed.

Since the initial test when I was able to raise the tilt and partially lower it, the tilt will not operate either up or down, all that happens is what appears to be a dead short, no sound or movement from the tilt motor, the aforementioned arcing did not happen with the initial test but does so since


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Re: Tilt motor problem '77 175hp v6 Johnson

Even with a new 3 wire electric motor, applying battery voltage directly to the Green (up) wire of the PTT electric motor (with it installed) will simulate a short (arcing) due to the high voltage demand of the electric motor in that up mode.

However, if all you're getting is heavy arcing in either direction and no movement of the unit, I would assume that the electric motor is shorted out. In which case, either have it rebuilt by a reputable shop or replace it.
 
Re: Tilt motor problem '77 175hp v6 Johnson

Oh happy days

In your opinion what could have caused the motor to short ? If I am correct the motor has to be removed from the boat to extract the tilt motor ..yes? I will test it again with the solenoid etc connected and see if it will function

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Re: Tilt motor problem '77 175hp v6 Johnson

Joereeves... please disregard my last post ...I will put that one down to a senior moment

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Re: Tilt motor problem '77 175hp v6 Johnson

Raise engine to its highest tilt level and secure it solidly as the port (left) transom bracket requires moving. You do not want the engine to accidently lower or move towards the port side.

Remove the large steering tube nut from the port side of the tube. Remove the three PTT unit retaining bolts from the port transom bracket. Remove the two retaining bolts that secure the port transom bracket to the boat. Slide the port transom bracket aside. Remove the top PTT pin from the center tilt cylinder. Remove the remainder of the retaining bolts from the PTT unit.
 
In re-reading what I wrote..... it would be better to remove the top pin from the center tilt cylinder before removing the port transom bracket as those pins can sometimes be a bear to remove.
 
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