Raising Motor

[mfwyatt]

Guys,


I have searched and found the solution to my problem. However I have questions on how to fix the problem.

At 1/2 throttle up to WOT, I get a huge V of water shooting out behind the boat and going over the top of the engine housing. From what I have read on here, I need to raise my motor up a bit. Is there a general rule of thumb on where the plate above the prop needs to match up on the bottom of the boat?

Also, my motor is in the lowest position on the transom but if I raise it the hooks that go over the transom won't be resting on top of it anymore. Do i need to place a board on top of the transom to get it to hook on? Or are those hooks even important?

Thanks in advance for the help.

 

[mfwyatt]

Re: Raising Motor

I guess I should have been more clear. Will it hurt to go up a hole or two without adding a board to the top of the transom?

 

[EGlideRider]

Re: Raising Motor

No, it will not hurt and it may solve your problem but may create a ventilation problem.

 

[mfwyatt]

Re: Raising Motor

When you say ventilation problem, do you mean like the prop coming out of the water? I'm not sure I know what you mean. This is my first OB and it has certainly been a learning experience. Since I have had it, I have replaced the stator assembly(I even pulled the flywheel myself), changed power pack, rebuilt carbs, and replaced the rectifier. THANK YOU REPAIR MANUAL! However, the manual is no help when it comes to this.

 

[EGlideRider]

Re: Raising Motor

When you raise the motor, you are inviting a ventilation problem. The prop does not have to come out of the water. It can get close enough to the surface to 'suck' air down through the water.

You can't hurt anything by raising it a notch and see what happens. You will know it is ventilating when the engine RPM's increase to nearly maximum with no corresponding increase in speed.

 

[Jeep Man]

Re: Raising Motor

I have mine up two holes and will soon be dropping back down by one. I do not have a ventilation problem, but because pontoons create a lot of turbulence at the back,the prop can get more bite by being lower, where the turbulence is less. On mine, if I go to the bottom hole, the steering rubs the deck. Otherwise, I would have it all the way down.

 

[mfwyatt]

Re: Raising Motor

I raised my motor up 2 holes. The cavitation plate is about 4 inches from the bottom of the transom. I am gonna take her out tonight and see how she does. I was only gonna raise it one hole but I might as well go 2 up and then its a lot less work to lower it if I need to.

 

[mfwyatt]

Re: Raising Motor

Okay, so I tested out the motor last night. Seems to do a little better but still throws a ton of water up. I didn't have any ventilation/cavitation problems so I may try going up to the last hole. I'm now wondering if this boat originally had a shortshaft motor on it. If i can't get the water to stop coming up what would be some ways to ensure that this doesn't become a problem? I am running it in fresh water but the engine cover doesnt seal very tight. I think the cover is warped because the seals still look good. Should I even be worried about this?

 

[EGlideRider]

Re: Raising Motor

A little water inside may not hurt anything if the electrical connections don't get wet. The water will run out the bottom. But I would still make the effort to ensure a good cover seal.