Why my trim limit sensor needs again and again adjustment?

[silver_power]

I have a problem with my trim limit sensor. I calibrate it according the manual and i fit the screw very tight, but something go wrong and in the water it looses the adjustment. So the drive , keep raising with the up button. This happened 2 times. I calibrated it, i tested it several time up and down out of the water and everything was fine. But after i use it in the water something goes wrong.Both times i had perfectly calibrated it. The other sensor (trim level) is ok.
What is going wrong?

 

[indy440]

Re: Why my trim limit sensor needs again and again adjustment?

did you put the aftermarket sensors on it and cut and splice the wires? I did and had the exact same problem. I ended up just disconnecting the sensor all together so my trim button will raise the drive all the way up if I let it.

 

[silver_power]

Re: Why my trim limit sensor needs again and again adjustment?

No, as i fully repowered my boat and changed every cable in it, i had to take off the drive and so i had the opportunity to change correctly both the limit and level sensor of the power trim including the wires. So i did not use the old wires.I can not understamd why this happens.......

 

[silver_power]

Re: Why my trim limit sensor needs again and again adjustment?

Just a thought i just made.......is there a possibility the port side hinge pin not to to be so tight?......Maybe this has been a little bit loosen and so the limit sensor loses the adjustment? What do you think....? I must check it for sure.......everything else you may think please advice me .

 

[allingeneral]

Re: Why my trim limit sensor needs again and again adjustment?

Maybe the difference between the attitude of your boat sitting on the trailer and the attitude while floating in the water. My boat sits "Bow high" on the trailer, so if I were to adjust the trim sensors while trailered, I would have to account for the extra few degrees of difference between trailer bow level and floating bow level.

just a thought...

 

[silver_power]

Re: Why my trim limit sensor needs again and again adjustment?

The proccedure for the trim limit adjustment starts with the drive at full down position. So when i have the boat on trailer, a move the bow down and so i can put the drive at full down position and so i will not have to make any calculations for the angle difference. The adjustment proccedure is clear.
Something else happens and laugh with me.......

 

[indy440]

Re: Why my trim limit sensor needs again and again adjustment?

yeah, the adjustment procedure is clear and easy, but mine wouldn't hold even hold the adjustment for 5 minutes sitting on the trailer in my driveway.

did you use the sierra replacement sensors or OE merc?

 

[stonyloam]

Re: Why my trim limit sensor needs again and again adjustment?

Maybe the difference between the attitude of your boat sitting on the trailer and the attitude while floating in the water. My boat sits "Bow high" on the trailer, so if I were to adjust the trim sensors while trailered, I would have to account for the extra few degrees of difference between trailer bow level and floating bow level.

just a thought...

It doesn't work that way. The trim limit is determined by the position of the movable bellhousing (up-down) relative to the fixed gimbal ring. The boat could be upside down and it would still work the same.

 

[silver_power]

Re: Why my trim limit sensor needs again and again adjustment?

OE Mercruiser.
What is the difference?

 

[silver_power]

Re: Why my trim limit sensor needs again and again adjustment?

It doesn't work that way. The trim limit is determined by the position of the movable bellhousing (up-down) relative to the fixed gimbal ring. The boat could be upside down and it would still work the same.

Exactly, and that is why i am thinking the option to check the port side hing pin, in case it may be loosen and so it can be rotated for some degrees .

 

[stonyloam]

Re: Why my trim limit sensor needs again and again adjustment?

Just a thought i just made.......is there a possibility the port side hinge pin not to to be so tight?......Maybe this has been a little bit loosen and so the limit sensor loses the adjustment? What do you think....? I must check it for sure.......everything else you may think please advice me .

That could do it.

 

[allingeneral]

Re: Why my trim limit sensor needs again and again adjustment?

It doesn't work that way. The trim limit is determined by the position of the movable bellhousing (up-down) relative to the fixed gimbal ring. The boat could be upside down and it would still work the same.

Oh, sorry then. I should be quiet and just read/listen more before I start trying to give advice :blush:

 

[indy440]

Re: Why my trim limit sensor needs again and again adjustment?

OE Mercruiser.
What is the difference?

just wondering, I used the sierra ones and have the exact same problem.

 

[nola mike]

Re: Why my trim limit sensor needs again and again adjustment?

Maybe the difference between the attitude of your boat sitting on the trailer and the attitude while floating in the water. My boat sits "Bow high" on the trailer, so if I were to adjust the trim sensors while trailered, I would have to account for the extra few degrees of difference between trailer bow level and floating bow level.

just a thought...

no, that won't make a difference. the sensors are just electrical contact switches, and will respond to the angle of the motor regardless of the position of boat.

EDIT: whoops, terry beat me to it.

 

[SSSuper83]

Re: Why my trim limit sensor needs again and again adjustment?

Cut the wires to both of them and keep an eye on your drive. Always hit down trim before you start the engine. If its too low, you will feel the skeg bump the ramp and raise it back up another couple inches. Sounds stupid, but it works

 

[nova_gts]

Re: Why my trim limit sensor needs again and again adjustment?

Should they both be cut and left loose or should they be cut and connected together to bypass the sensor?

 

[ENSIGN]

Re: Why my trim limit sensor needs again and again adjustment?

check the pivot pin and make sure it's TIGHT.I don't recomend jumping out a limit switch as the drive can come out of the water if you're not careful.

 

[indy440]

Re: Why my trim limit sensor needs again and again adjustment?

Should they both be cut and left loose or should they be cut and connected together to bypass the sensor?

cut them and connect them. I just used a wire nut.

How do you check if the pivot pin is tight?

 

[carcraze]

Re: Why my trim limit sensor needs again and again adjustment?

To check the pin remove the sensor and the sensor is driven by the hinge pin. A merc hinge pin tool will fit or possibly a 1/2 allen key. You may also want to check to make sure the hinge surface is not really worn alowing the hinge pin to wallow around in the hole and/or any spacer washers are in the housing to take up lateral play. I am not sure what side to side would cause in the sensor as they are not made to be side loaded.

Just a thought.

 

[zbnutcase]

Re: Why my trim limit sensor needs again and again adjustment?

cut them and connect them. I just used a wire nut.

How do you check if the pivot pin is tight?

Wire nuts have NO place on a boat, not even on AC circuts