Recent content by bbook83

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    1981 MerCruiser 120 tick/ squeak

    I have a 140 (pretty much the same engine), which I bought new in 1974. My first thought is that at this point in its life, running at 4,000 rpm for an extended period, is a lot to expect from the engine. The engine is so easy to work on, you have little to lose, other than your time, by doing a...
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    350 Magnum Tournament Ski spark plugs

    I have gone back and forth in my mind as to tackling this, but you have given me incentive to proceed. Thanks Lou!
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    350 Magnum Tournament Ski spark plugs

    Good to hear of your experience Lou. Wish me luck that it will work out for me too.
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    350 Magnum Tournament Ski spark plugs

    Scott is totally correct about pulling the engine and tearing it down on a stand. I don’t have the facilities for that. Anything I can do for now will be in the lift where it is now, or on the trailer behind the cabin. I can pull the manifold, and probably the head in those settings.
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    350 Magnum Tournament Ski spark plugs

    I failed to answer Lou’s question about oil in the water. There is none. A little good news.
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    350 Magnum Tournament Ski spark plugs

    I re-did the compression test. All were the same, except 7 at 90 psi, and 3&5 still zero. I put the camera down 3&5. Not a great view, but no apparent piston damage, and valves opening and closing. All indications are a blown head gasket, hopefully no fire slotting or other damage. . Need to...
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    350 Magnum Tournament Ski spark plugs

    Thanks for the good responses. I will pick up the spark plugs today and a new compression tester and try compressions again and see what I can with an endoscopic camera and report back.
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    350 Magnum Tournament Ski spark plugs

    Update. I did a compression check with a cheap tester without assistance, and not fully reliable, but all cylinders were between 120 and 135, except the one that lost its plug electrode recently (#3) and the one that lost the same a few years back (#5), which are side by side in the same head...
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    350 Magnum Tournament Ski spark plugs

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    350 Magnum Tournament Ski spark plugs

    Attached is a photo of the sticker from the top of the flame arrester and another from the Tune Up Specifications from the Mercruiser Maintenance Procedures Manual for “1997 Gasoline Ski Series”. The plug type is what I am running, but the sticker say .035 gap and the manual shows .040. Not sure...
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    350 Magnum Tournament Ski spark plugs

    I pulled all of the plugs after the engine was failing to reach WOT and then backfiring on acceleration. They are all in need of replacement, but one (photo attached) was so bad, the electrode was completely gone. This is a carbureted engine, 1997, serial # OK146780. I was running AC Delco MR43...
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    A motor question on Cristmas day uggh

    On my 3.0 liter 140, the front mounts on my boat were secured to a cross member between the stringers. When the lag bolts stripped, I drilled out the holes large enough to drive lag bolt “shields” (used to put lags into concrete) in and the bolts snugged up fine. I ran that way for many years...
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    A motor question on Cristmas day uggh

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    1990 Mercruiser 4.3 Stalls

    Try running from a remote tank.
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    Mercruiser 3.0 Leaking Water On Top of Manifold

    There is a drain plug on the underside of the manifold. Is it coming from there?
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