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Mercruiser io


Earl28

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It could also be a bolt holding a wiring clip or one of the bolts holding the valve cover in place or one of the bolts holding the oil pan in place or one of the bolts holding the flywheel cover in place.

good luck finding the hole where it belongs.

 It can also be a bolt that fell during a repair and then was replaced by another one from the toolbox.

Good luck 

Edited by rolmops
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The 10.9 marking on the head of the bolt indicates it is a metric bolt and an indication of it's tensile strength properties. Before going nuts trying to force it into an imperial threaded hole, I would take it to a hardware store that has all the test thread gages and confirm it is metric. I don't know if Mercruiser uses metric bolts or not.

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