Re: 1967 Johnson 6 hp water pump
As Ezeke said, an OEM service manual will be your best friend, and will pay for itself many times over.
Get a manual, read it over. Then this video may help before you start the waterpump.
"http://www.meegsonline.com/tmd/waterpump.wmv"
Changing the lu oil is a bit easier. To start you will need some oil and a pump. Recommended is 80-90 outboard gear oil, it has additives to protect the lower if you have water intrusion. Always replace the washer on the vent and drain screw, as this is the #1 cause of water intrusion. On the older electric shift motors, you need Premium Blend Type C for electric shift. Remove both the drain and vent screw, letting the oil drain. Install the new washers. Hook the pump up to the drain screw, and fill the gearcase until the oil starts to exit via the vent hole. Replace the vent screw, this will create a vaccuum, allowing you to remove the pump and install the drain screw. If the oil looks milky or white, let us know, that means there is water in the oil and further measures will need to be taken. Thats it, all done.
Here is the pump that was referred to, not necessary, but you will be thankful once you have it, or try the tube method first.
