Have a mystery nosie in my Omc 800 maybe ball gears

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fishguy1721

Recruit
Joined
Sep 23, 2012
Messages
2
Hi everyone,
I bought a 24 foot Searay weekender back in May. It is 1978 and after spending most of the summer getting it up and going I have a mystery problem. The boat I bought sat for 7-8 years in warehouse. The noise or thunk that is happening makes the whole motor jump. It happens when I am under power above 2000rpm. The rpms don't change and it does't come out of gear. It shifts find in and out of gear. I am wondering if my select a trim is slipping or could it be the ball gears are worn. It doesn't do it all the time. My trim broke they day I put it in the water for the summer but I checked the drive it was all the way down. Thanks for the help in advance.
 
888

888

Petty Officer 1st Class
Joined
Jan 7, 2012
Messages
358
Re: Have a mystery nosie in my Omc 800 maybe ball gears

Sounds like rotten motor mounts If the motor is "Jumping"
 
southkogs

southkogs

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Staff member
Joined
Jul 7, 2010
Messages
14,792
Re: Have a mystery nosie in my Omc 800 maybe ball gears

Is the sound consistent and mechanical? In other words, you can time the "thunks?" If they're not consistent, I'd want to know if the drive was bumping up and down when you hit waves.

Otherwise, my first guess would be ball gear and second would be the splines in the shaft going to the lower unit out of the upper gear case.
 
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