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  1. M

    Bubbles in coolant. Not a head gasket?

    I have bubbles in my coolant reservoir. The engine was NOT overheated but I did accidentally restrict the flow in the hose to the muffs to the lower water pump and burn it up. It ran this way for about 3 minutes before I caught it. The temp gauge did not get above halfway on the closed...
  2. M

    470 cam seals-repaired TWICE-PLEASE help

    I have installed redi sleeves and new seals on my Mercruiser 470. The first time the outer seal leaked and coolant came out the weephole. I thought that I must have cut it on installation, so I ordered a new Mercruiser seal and tore it back apart. There was a small mar in the inner...
  3. M

    Sea water pump failure - what should I check?

    I started my boat after a little maintenance the other day. I carefully regulated the amount of water flow through the muffs so as not to blow water past the seals (done it before), and started it up. I was paying very close attention to the coolant temp gauge (closed system), and it never got...
  4. M

    M'cruiser 470 timing cover drain plug question

    1979 Mercruiser 470. Yesterday I noticed an antifreeze leak (big surprise, huh). I traced it to a small hole in the water pump. The hole is about 7 o'clock or so viewed from the front of the motor. I am assuming that it is a weep hole just like an automotive water pump. New water pump...
  5. M

    Mercruiser fuel pump vapor locking--how to cure

    Out on the Ohio river today, 95 degrees ambient, ran about 2 hours then shut down for a while. Boat has a new lower water pump and the temp never approaches the red in the temp gauge. (How accurate is the gauge? Who knows) The boat wouldn't restart. Actually, thats not quite correct. It...
  6. M

    Mercruiser pre alpha(?) upper/lower interchangeability

    I recently bought a '79 Sea Ray with A Mercruiser 470, and within a short time the upper ring & pinion destroyed itself. The lower unit looks OK, so I am going to try to find a used or reconditioned upper, as I don't have the tools to set up the gears myself. Also, the sterndrive is not the...
  7. M

    First I/O. Made it 2 miles

    Help. I bought a 1979 Sea Ray, Mercruiser 470 last weekend. Ran fine when seller owned it, but I made it 2 miles from the launch ramp and I was throttling back once I was planed and heard a stripping-type noise, and all forward motion stopped. Now when i start the motor and try to engage the...
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