POWER TILT AND TRIM

[leafs]

WHAT IS THE DIFFERENCE BETWEEN THE TWO IF YOU HAVE ONE DO YOU HAVE BOTH

 

[rogerwa]

Re: POWER TILT AND TRIM

Trim is fine adjustment of the attitude of the outdrive to alter the operating characteristics of the boat while on plane. For instance, you would use trim to raise the bow after planing to reduce plowing of the hull and to reach the optimum angle of the hull with the water. Likewise you would trim down during starts to get on plane faster and also to eliminate porpoising from trimming up too far.<br /><br />Tilt is used to raise the outdrive or LU up out of the water (or trailer position).<br /><br />While there have been tilt only mechanisms, most OB or I/O's that tilt will have trim as well.<br /><br />On my I/O, the tilt uses the same rams as the Trim. It's just a difference of travel. The trim circuit has a limit switch to limit the amount of trim that can be applied. This is done to protect the u-joint on the outdrive. The trailer switch is provided to override the trim switch.<br /><br />On an OB, this is not an issue, but I believe the tilt rams are often different than the trim rams.

 

[leafs]

Re: POWER TILT AND TRIM

I ONLY HAVE 1 SWITCH THAT TILTS THE MOTOR UP AND DOWN DOES THIS MEAN I ONLY HAVE TILT NOT TRIM

 

[ungodly]

Re: POWER TILT AND TRIM

Leafs,<br /><br />Rogerwa is on the money. I just wanted to add two-cents worth re: outboards (since we don't know what kind of setup you have). Most O/B trim and tilts are two-ram systems. The trim adjustment travels much more slowly than the tilt does. There are also single ram systems that perform both functions. Mine, on a '92 60HP Merc, is a single ram, and slows down through the lower 20 degrees of travel (trim range). It then picks up speed to tilt the motor through the rest of the ram's range.

 

[sho305]

Re: POWER TILT AND TRIM

Some older OBs have tilt only with a single ram that lifts the motor all the way, but will not hold it under power. When you gas it, it will slam down on the pin. These have only a slim single cylinder, and most tilt & trim have a short fat cylinder also that is capable of holding the motor under power but has limited travel/length. Larger motors have big dual cylinders mostly, like most larger (old 90 and up HP) Mercurys and I/Os. These do both as their large size indicates.

 

[RICKRICK1]

Re: POWER TILT AND TRIM

I added tilt and trim from an blown 115 hp mercury and put it on my 65hp merc. In order to have both tilt and trim I have two switches, the one used for trim also has a trim limiter in the system. My trim cylinders are bigger than the newer tilt cylinders and it takes two cylinders to move the motor evenly. It will not let me trim out past the last hole in my mount (safety). From all indications you only have tilt. Not sure if you mentioned having a manual, but most manuals for each motor will give a good example of how the system on that motor works. A manual will answer your questions, and you can observe YOUR motor and get a better understanding of whats happening.

 

[RICKRICK1]

Re: POWER TILT AND TRIM

Leafs,<br /> Went back and looked, on your first post on the outboard forum you did say the manual will not allow you to trim above 1500 rpm. You have a tilt only system, the releive valve opens up at any throttle setting above that and lowers the motor to which ever hole you have YOUR stop in. In order to get a trim you will have to replace several parts and finding them can be difficult. <br />I spent almost a year finding and getting the parts together.