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Dave,
Get a copy of Mercury’s shop manual. You can make what you need to do the impeller. These are very cool motors and as far from a conventional OMC as you can get.
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Here are some pictures of the real tools. They seem to be available at this website:
http://www.johnsmcintoshvintagemercuryo … Tools.html
One tool they don’t sell is patience. You will need it for this job. If you have that, and enough mechanical skill to do other impellers, you can do it. Just be advised that it’s not going to happen in an afternoon. Don’t get me wrong: The Mark 10, also known as an "automatic transmission" engine, is one of my favorites. I have at least 25 of the type and have done at least as many impellers. It still takes me a long time to do it right.
One thing I don’t show in these pictures is my trick for cleaning out the area where the water pump cartridge resides. I have two small wire wheels that fit in an electric drill. One is a side wheel and one is an end cut brush. I chuck these into a 12" drill extension, to clean all the corrosion and gunk out of the drive shaft housing cavity where the pump goes. This makes things a lot easier to put back together, without force or cuss words.
Long live American manufacturing!
I have done this once so this was a learning experience for me. I purchased a Sierra impeller #18-3008. It has a rounded key way, you need to square the slot up with a small flat file. It fits perfectly with a little filing. I made the tools I needed as I went. A flat bar about 1 1/4 wide took care of the spanner nut. A tool to pull out the impeller cartridge was a little harder to figure out but a little patience and things worked out good. I also pulled the power head off. Some people say you can change the pump without doing that but I did. As you can tell from the pictured I mounted the leg back in the stand upside down. Really worked great for working down in that hole. Pay close attention as to how the shifting paws go in the case, maybe take some pictures. Also there is a small drain hole on the gear case ahead of the propeller. Make sure it is not plugged. It brings water up the leg to the impeller cavity so it does not start dry. I need to get a picture of that 1/16 hole and post it. My motor is buried in the shed for now.
Loveem or hateem these Merc’s are interesting!
hope this helps
dale
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