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  1. 1

    Water pump flow and torque specs

    Hello, Yesterday, I installed my new water pump in the lower unit of my 1978 Mercury 800. According to a rebuild manual, the four bolts that attach the water pump to the lower unit need to be torqued. According to my manual, two get torqued to 30lbs, one to 20, and one to 40. However, when I...
  2. 1

    1978 Mercury 800 Water Ports

    Hello again, I've removed my lower unit, as water was not exiting the engine when I had it attached to a hose with earmuffs. My water pump was shot, as I expected. While the lower unit was off, I decided to attach a hose to the water tube leading up to the power unit, just to check that water...
  3. 1

    Mounting bracket adjustment

    Hello, I have a 1978 Mercury 800, 80 hp 4 cylinder engine. I just put it on my boat, a 1970 Thunderbird Seminole, today, but I was hoping someone could help me with regards to the mounting bracket. The bracket has two large bolts at the top that end in a large, circular disc that presses...
  4. 1

    1977 Mercury questions plus shaft conversion

    Hello, I'm looking into purchasing a 1977 Mercury 800, serial number 4835077. I also looked at a '77 Mercury 1150, serial 3912817. I just got the 800 running and am thinking of buying the 1150 for parts. What is the opinion of the 800? Is it a good motor, or am I gonna regret purchasing it...
  5. 1

    Proper shaft length?

    I've measured my transom and it is 20.5" in length. This means the boat is designed for a longshaft outboard. However, I'm having difficulty locating an appropriate length motor. I'm looking at a motor whose cavitation plate sits about 3-4" above the keel. Am I going to be cavitating all the...
  6. 1

    Electrical problems on 115hp Johnsons

    Hello, I've been looking into some used Johnson outboards, from the mid to late '70s. However, they all seem to have a consistent problem of no spark getting to the plugs. I've even encountered this on 150hp Mercury motors. Some motors have had little work done, so they're pretty stock. But one...
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