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  1. CaliFormula

    Mercruiser 260 Overheating over 2000 RPM

    Hello everyone, I’ve got a problem. My 1985 Mercruiser 5.7 is overheating under load at about 2000 RPM. I have done new risers and manifolds, new impeller already swapped my 160 thermostat for a 142 thermostat. I checked and the flappers and they were fine. I have freshwater cooling and verified...
  2. CaliFormula

    Mercruiser 260 no spark

    Hi there, I’m at my wits end. Serial number: 6765655 I have run through the flowchart numerous times. I have replaced the coil twice, cap and rotor twice I just replaced the ignition sensor in the distributor. With the key on I have 12v on both + and - terminals (not sure if that’s a...
  3. CaliFormula

    Mercruiser 5.7 head and intake bolts

    Hello guys and gals, so I’m in the process of putting my Mercruiser 260 back together and as I’m getting ready to put the intake manifold on I realized I didn’t put any thread sealer on any of my ARP head bolts. (Black coated ones that I reused). I used the ARP lubricant but no sealer. I believe...
  4. CaliFormula

    Mercruiser 260 Spitting oil from engine

    Hello everyone I love this forum and really appreciate everyone’s input. So I had a leaky riser and got water in my oil. I fixed the riser and was doing an oil change to get the oil clean and I noticed oil in my bilge. The oil is spitting out from a threaded hole in the front of the block. And...
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