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Engine Problems! Smoke and Knocking


jasonxfield

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Hi all,

Im gutted. My boat began making a deep knocking noise which then developed into loss of power, white and then black smoke from exhaust.

When at idle there is no knocking noise https://youtu.be/FxEVigRVgsE, but as soon as the boat is put in drive it creates a bad knocking noise https://youtu.be/T3AIqQR_-YQ.

Does anyone know what this could be? I am leaning towards a worn thrust bearing but would this cause the smoke problem?

Any help appreciated thanks.

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@jasonxfield: I would also perform a leak down test and also given the knocking sound particularly if a plug shows distress. Consider sending some of the oil in the crankcase to Blackstone Labs for analysis to see if the knock might be a rod bearing. You could also pull the filter and cut it apart for analysis. Hopefully, something much simpler and easily rectifiable.

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