Welcome! Need support, you got it. Or share you ideas and experiences.
I am working on a 1978 Johnson, a 7.5 horse. I am wanting to put a new impellar in the water pump, but I am having trouble taking the foot off. I took out all of the screws and the foot dropped about a quarter of an inch, but I can't get it to come completely off. I think if i can find the coupling holding together the 2 shafts i will be able to take off the foot. If anyone knows where the coupling on the motor is located, or any other way to access the water pump, it would be a tremendous help. Thanks.
The shifter rod has a coupling from the upper housing to the lower unit. The shifter rods have circular grooves which lock the rods into a clamp type coupler by the clamp/coupler bolts. You should have a small oval inspection hole in one side of the upper portion of the lower leg. You will gain access to the clamp bolts there. Remove the lower bolt since it is easier when reinstalling the lower leg to find a larger hole with a smaller object, then with the same socket and extension, reinstall the bolt - not too tight - the clamp is bronze.
Reinstallation of the lower unit may be a bit trickey and require some thought when it comes to reinserting the shifter rods into the clamp - use the shift lever and place the lower unit into gear (pull the shifter rod and exert rotating pressure on the prop to keep the dogs together) and you will need to rotate the splined drive shaft to align with the power head female spline.
If no one can help here, post your question on the board at the antique outboard motor club website: www.aomci.org
Lots of helpful pros there.
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