Johnson 20 Gearing

[Lowen]

Hey I have '80 Johnson 20hp and it is jumping out of forward gear at about half throttle. I have opened up the bottom end and checked the gears and clutch dog and don't see any signs of wear. Could this be an adjustment to the shift rod itself? Any help is appreciated.

 

[Daviet]

Re: Johnson 20 Gearing

Could you post your model number, I can't find a 20hp listed in 1980.
Was going to look at your engine to try and help you.

 

[HighTrim]

Re: Johnson 20 Gearing

Are you sure that the lobes of the dog or gear are not slightly rounded? They should be precisely machined with right angle edges.

Usually when it jumps out of gear during higher rpms, the shift cable will keep tension on the shift linkages, pulling it back into gear and getting the standard THUNK like you are hitting a log. Since yours does not, I am going to guess that you're improperly adjusted or you have worn shift linkages, along with slightly rounded lobes on either the dog or forward gear or both. But is just a guess.

 

[Lowen]

Re: Johnson 20 Gearing

Ok here are a few pics of the gears and clutch dog. I bought this motor of a friend of a friend over the phone only to learn there is no model/serial number tag on the side. Can't find a model number anywhere. Just goin on a wing and a prayer here trying to match parts. On the side of the coil there is CD22 and below that 582474 0A7S18. Another number on the engine I have C8064436.