Welcome to Jetboaters.net!

We are delighted you have found your way to the best Jet Boaters Forum on the internet! Please consider Signing Up so that you can enjoy all the features and offers on the forum. We have members with boats from all the major manufacturers including Yamaha, Seadoo, Scarab and Chaparral. We don't email you SPAM, and the site is totally non-commercial. So what's to lose? IT IS FREE!

Membership allows you to ask questions (no matter how mundane), meet up with other jet boaters, see full images (not just thumbnails), browse the member map and qualifies you for members only discounts offered by vendors who run specials for our members only! (It also gets rid of this banner!)
Guest, we are pleased to announce that Hydrophase Ridesteady is offering an extra $100 off for JETBOATERS.NET members on any Ridesteady for Yamaha Speed Control system purchased through March 7th, 2025. Ridesteady is a speed control system (“cruise control”) that uses GPS satellites or engine RPM to keep your boat at the set speed you choose. On twin engine boats, it will also automatically synchronize your engines.

Click Here for more information>Ride Steady group buy for JetBoaters.net members only

You can dismiss this Notice by clicking the "X" in the upper right>>>>>

Connecting rod nut backed off?

Thread starter wajetter
Start date Jun 11, 2023

wajetter

Jet Boat Lover

Jun 11, 2023

Is it possible that a connecting rod nut would back off on its own and cause a spun bearing and the crankshaft to burn a little ? Or does a spun bearing cause the nut to back off?

I found out that the knock was a spun bearing in this thread

https://jetboaters.net/threads/clanking-noise-near-oil-cooler-ar230ho.41264/post-651845

I wanted to post a specific question to see if anyone had this happen.

I would assume that a spun bearing would not normally cause the nut to back off. Yes, a spun bearing will result in more space and therefore the knock, but would the knock back off a properly torqued nut?