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    no spark on mercruiser 5.7l carb

  2. S

    5.7 MCM Crank but no start

    2003 Mercruiser 5.7L Gen+ Alpha/Bravo 2 bbl Mercarb with Thunderbolt V ignition with knock sensor. Ser 0M634166 Mod 4312025RS mated to a Bravo 3 outdrive in a 25 ft sport fisherman. Issue: Engine cranks, but no spark following extensive engine and hull maintenance. Background: Bobtail...
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    165HP Mercruise wont start 224cid 4 cyc

    Agree that right side of pictures appear to be of a rusted out freeze plug. It needs to be pulled and replaced. Freeze plugs are in water jackets and not in the exhaust pathway. Exhaust blowing out of the freeze plug hole would indicate either a failed gasket between the exhaust manifold and...
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    Mercruiser 5.7L Carb Alpha/Bravo Overheating or Within Spec?

    Folks, I have a perplexing manifold/riser temperature/water flow issue that has me stumped. I don’t know if I am chasing a valid overheating issue or am within normal operating conditions and chasing a ghost. Below is a bit long but I tried to address all the “Have you tried…” issues up front...
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