Hub Slipping?

H

HAWKS2010

Cadet
Joined
May 17, 2010
Messages
14
I bought a 1965 18HP Johnson last year.
Ran fine on driveway. In lake it runs fine up to about 1/2 throttle.
When I try to go any faster, engines revs and boat stops moving.(prop stops spinning)
What would cause the prop to stop spinning.
 
lindy46

lindy46

Captain
Joined
Nov 27, 2008
Messages
3,886
Re: Hub Slipping?

Sounds like a spun hub in the prop. Draw a line across the hub with a waterproof magic marker, and run the engine to duplicate the problem. If the line moves, the hub is spun. Hub can be replaced at a prop shop or Johnnyrude dealer can send it out to be fixed. Probably around $40-50.
 
H

HAWKS2010

Cadet
Joined
May 17, 2010
Messages
14
Re: Hub Slipping?

Lindy, thanks for your reply.
Can this be tested off the boat,
i.e. in 55 gallon barrel,
or in free air just with hose connection to water intake?
Or do I need to test it on boat in lake.
Thanks
 
B

blimp

Petty Officer 1st Class
Joined
Sep 30, 2009
Messages
237
Re: Hub Slipping?

lake test, you should never rev an engine up on muffs or in a barrel. if you don't have a waterproof marker, you can scribe a line with a screwdriver or another pointy object.
 
H

HAWKS2010

Cadet
Joined
May 17, 2010
Messages
14
Re: Hub Slipping?

Thanks blimp, just wanted to check.
Motor and boat presently in different states.
Road trip!
 
royal0014

royal0014

Master Chief Petty Officer
Joined
May 6, 2010
Messages
874
Re: Hub Slipping?

'Ya know, I used to see drag racers put sheetmetal screws through the edge of wheel rims, into the bead of the tire, so when they did a burnout the rim would not spin inside the tire. Wonder how that concept would work on a prop?
JUST KIDDING!!
 
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