Jump to content

Welcome to TheMalibuCrew!

As a guest, you are welcome to poke around and view the majority of the content that we have to offer, but in order to post, search, contact members, and get full use out of the website you will need to Register for an Account. It's free and it's easy, so don't hesitate to join the TheMalibuCrew Family today!

Engine Problems! Smoke and Knocking


Recommended Posts

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.

Link to comment

@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.

Link to comment

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...