Topic: 1955 Johnson Rd17 – Antique Outboard Motor Club,Inc

This topic has 14 replies, 8 voices, and was last updated 2 years, 9 months ago by need2fish.

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October 10, 2022 at 3:24 pm #267413
grunt311
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Hello, I have a RD17 that runs great but suddenly have an issue. While run the motor last night 3/4 throttle in forward hear it began to slip. Stays in gear but as I accelerate it slips and will only get up to around 5-6 mph. Any ideas here, I am thinking maybe a work clutch dog or something in the lower unit. If I hold the flywheel I can rotate the prop counter clockwise in forward gear. It takes some pressure but it will rotate slowly. I can hear or feel any clunking it feels smooth but certainly not locked to the drive shaft as it should be.

Thank you, Nick
October 10, 2022 at 3:58 pm #267414
Tubs
Participant
.

A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.
October 10, 2022 at 4:05 pm #267415
frankr
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US MEMBER PAY BY CHECK
A worn clutch dog will produce a grinding noise if slipping that badly. However, a slipping prop hub will be smooth, like spinning your wheels in snow or mud.
October 10, 2022 at 4:48 pm #267420
crosbyman
Participant
Canada Member
mark the prop and GC with black marker …. if the prop slips you will know

Joining AOMCI has priviledges 🙂
October 10, 2022 at 6:18 pm #267441
Mumbles
Participant
After removing the prop, mark it with a Sharpie across the hub and on the prop itself. After running the motor for a bit, remove the prop and see if the marks are still lined up. If they aren’t, you’ll know that the rubber hub in the prop is slipping and needs repair. This method only works for props equipped with a rubber hub. If your prop is solid and slips, it could be the shear pin has done its job or something inside the gearcase is wrong.

Here’s what crosbyman means.
October 10, 2022 at 6:35 pm #267449
crosbyman
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Canada Member
exactly… thanks 🙂

Joining AOMCI has priviledges 🙂
October 10, 2022 at 7:40 pm #267455
frankr
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US MEMBER PAY BY CHECK
Anatomy of a prop.
October 10, 2022 at 8:48 pm #267459
johnny
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Nick, Please explain what a “work clutch dog” is. Also, propellers are not attached to the drive shaft. They are attached to the propeller shaft.
October 11, 2022 at 8:43 am #267471
grunt311
Participant
Followed the instructions and sure enough the prop is slipping on the rubber hub. Is there a way to fix this or do I need to replace the prop.

Thank you for all the replies I appreciate it.

1 user thanked author for this post.

fleetwin
October 11, 2022 at 9:03 am #267472
crosbyman
Participant
Canada Member
some prop shops can repair it but…. it is old and they may or may not have what it takes.

ask around

seems I saw a solution some time ago …drill a hole (off center) across the prop body and hub and insert a pin or screw to lock hub and prop together. 2 likely need to balance the prop !

change the propeller shaft drive pin for a brass pin because you will no longer have hub slipping to protect the prop shaft and gears

Search Results for ‘prop hub fix’ – Antique Outboard Motor Club,Inc (aomci.org)

Joining AOMCI has priviledges 🙂
- This reply was modified 2 years, 10 months ago by crosbyman.
- This reply was modified 2 years, 10 months ago by crosbyman.
- This reply was modified 2 years, 10 months ago by crosbyman.
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