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  1. 7

    850 Lower Unit Fit 1000 6 Cyl.?

    I tore apart my '77 850 to find a broken crank, so now I need an engine. Will a '69 1000 6 cyl. Thunderbolt fit my '77 850 4 cyl. Thunderbolt #4594650 lower unit? I won't be using the lower unit from the 1000 b/c it's cracked. Thanks!
  2. 7

    Low RPM Knock

    Well I finally got my '77 850 to start. At idle speed I'm hearing some knocking. It doesn't sound like a metal-to-metal "tink" but more of a "donk" or "clank". However, when I increase throttle from high idle, the sound seems to go away. What's the easiest way to diagnose this problem? If I...
  3. 7

    Cracked Fuel Pump Cover

    I'm restoring a 1977 Mercury 850 Thunderbolt. Today I noticed a fuel leak near the pump, and it happens to be a cracked fuel pump cover. Are these still in production? If not, can it be fixed?
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