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1987 70 water jackets

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  • 1987 70 water jackets

    I had a weak water stream and disconnected the hose from the pee hole to the water jacket. The hole in the block had white corrosion built up in it. I cleaned it out with a piece of wire and the stream was much better. Can I pull the thermostat and pour something into the water jacket to clean out the corrosion? Thanks.

  • #2
    In a motor that old it's probably a good idea to just pull the head and do a complete cleanout. I've found that CLR does a good job of loosening up the mineral buildup without damaging the metal. Use a toothbrush to scrub after the CLR has loosened it up.


    Mike

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    • #3
      Mike,
      Thanks for the reply. Do you mean pull the exhaust covers or the cylinder head? I'm worried about snapping bolts because it's never been apart. Should I use heat on the bolts?
      Jim

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