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seakaye12.
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August 22, 2025 at 10:13 am #299174
Hello!
I have accepted a new challenge, a Mark 10. As someone who has only worked on OMC motors, I understand that this era of Mercs is a more difficult breed to work on.
While it has great spark, I do know that it needs to have the impeller replaced. Would anyone be able to point me in the direction of where I need to start? Where would I be able to locate a service manual, and the correct tools?
Thanks,
Aidan
"Shells sink, dreams float. Life's good on our boat."
1921 Elto Light Twin
1923 Evinrude Model N Sportwin
1929 Evinrude N1 Folding Sportwin
1931 OMC Fold-Light
1956 Johnson JW-12RAugust 22, 2025 at 2:58 pm #299184Hi Aidan,
I can share several PDF Mercury Manuals if you want to PM me your e-mail address.
They are very large files; large enough to require use of a file transfer service for me to send them to you (They are loo large to go through most e-mail systems.)
File transfer services are free. I use WETRANSFER.
Working on Automatic transmission Mercurys is easier than many people make it out to be….yet way harder than other people make it out to be. It would be great if:
- Your motor is not a salt water motor.
- You have someone locally to you that has done it before and can be there with you on the first attempt.
- You have access to the special tools that Mercury supplied for these repairs…..or are able to make your own tools.
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August 22, 2025 at 3:53 pm #299185Seakaye,
Thank you for being willing to share your resources. I have some connections with more Mercury-based people who may be able to give me a hand. From what I can tell, this motor has not been a saltwater motor, as there are no visible signs of corrosion on the powerhead, or body at all. Just typical paint fading and wearing. I don’t have any tools, but if I can make them, I certainly will.
Aidan
"Shells sink, dreams float. Life's good on our boat."
1921 Elto Light Twin
1923 Evinrude Model N Sportwin
1929 Evinrude N1 Folding Sportwin
1931 OMC Fold-Light
1956 Johnson JW-12RAugust 23, 2025 at 12:13 pm #299208Seakaye,
Thank you for being willing to share your resources. I have some connections with more Mercury-based people who may be able to give me a hand. From what I can tell, this motor has not been a saltwater motor, as there are no visible signs of corrosion on the powerhead, or body at all. Just typical paint fading and wearing. I don’t have any tools, but if I can make them, I certainly will.
Aidan
The PDF’s will show the tools and how they are used. Hopefully someone you know has the tools; no point in re-inventing the wheel.
The pic shows the home-made tool fabricated from a piece of galvanized pipe.
1 user thanked author for this post.
August 25, 2025 at 3:30 pm #299251Aidan this topic had been discussed in this web sight before. It would be a good idea to do a search before you dive in. Take pictures! Lay the motor down on its back before you take the cover off. The shifting paws are behind that cover and they will fall out if you take the cover off with the motor up right. The paws are a mystery to get back in properly.
dale
get’em wet…don’t let’em set!
August 26, 2025 at 11:15 am #299271I make tools from time to time, some for the two KF-7’s I’ve had. None were as elaborate as yours. Pretty sophisticated work I’d say. I’m impressed!!!
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.
August 26, 2025 at 8:09 pm #299289Mercury Parts Manuals tell you the part name and numver and illustrates where each part of a compnent goes. In some cases it indicates a change and at what serial #.
My lucky day was the day I acquired a Parts Clerks set of
Mercury parts manuals. Service Manual and Service Tools are a good begining. Nothing replaces
experience.
Good LuckAugust 27, 2025 at 10:51 am #299305Tubs….the pipe in the picture is the home-made tool. Those other three are genuine Mercury tools…..
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