90hp johnson motor trouble

[jerryheflin]

hello i have a 1984 90hp johnson outboard motor.when in the water the other day i pushed the throtle forward and the motor stated knocking down near the prop and it made the boat vibrate pull the throtle back down it would not knock as loud if anyone can let me know about this i will be pleased thanks

 

[DJ]

Re: 90hp johnson motor trouble

Your prop hub may be slipping.<br /><br />Easy to check. <br /><br />1. Make a mark on the prop shaft.<br /><br />2. Make a corresponding mark on the outside of the prop hub (where the blades are attached).<br /><br />3. Run the boat.<br /><br />4. Do the marks still line up? If not, the prop hub is slipping.

 

[Silvertip]

Re: 90hp johnson motor trouble

Does it know in neutral as well??

 

[jerryheflin]

Re: 90hp johnson motor trouble

i dont know soon as it started i turned the boat off got back to the dock and kit the key real quick and still heard it.the hub is not slipping i checked that.another thing i noticed is that when i push the throttle forward you have to push it further up than usal to get the speed i dont have a clue

 

[Chinewalker]

Re: 90hp johnson motor trouble

I've heard that sound a couple times - both times it was the gears going out. I would check your lower unit oil for metal filings...<br />- Scott

 

[jerryheflin]

Re: 90hp johnson motor trouble

this sound is like the propeller is hitting rocks but nothing in propeller no metal flakes.do you think it might be something to do with the throttle cable?

 

[Walker]

Re: 90hp johnson motor trouble

Disconnect the shift cable at the motor and shift it into gear by hand. If it still acts the same then I suspect you have a bad/worn clutch dog. If it runs fine then you have an issue with your cable or controls.

 

[jerryheflin]

Re: 90hp johnson motor trouble

thanks for everyones help you are some great people.thanks again