Changed props today. Noticed prop was wobbly. Checked hub and nipple on prod side was sheared off and came loose when pulled prop. Last time out no vibration so I think it was still seated andonly came loose when prop pulled. Anyone have this happen? What can cause this. Motor only has20 hours andprop looks like new so nothing hit.
This is on a pro xs 250 with torguemaster hi perf lower unit
What is a "nipple on prod"??
Post a picture.
Nipple on hub on prop side. Dont know how to post a pic
The end of the hub kit that is solid metal broke off right. It's happened before could be from too much torque or striking something. A few on here have had them crack from end to end.
Yes the end of the hub has a solidnipplebuilt into it that looks like a mini thrust washer. It sheared off flush with the the hub. I have not been in any stumps or other shallow hazards and i never felt noat hit anything and prop has no marks. Wonder if when they just did 20 hr check if they tightened the prop nut too tight. Maybe just a factory defect. Taling out monday with new hub installed to see if any noticeable gear damage or vibration. Never heard of this issue before in 35 years.
Go here>>>>>Help with Boards/Posting/Videos, etc.Originally Posted by bassm1n
Click on this>>>>>Fast picture posting instructions.
Ok hopefully this works for a pic.
My guess is that the prop nut was not torqued to 55 lb/ft.
Do you think too much torque or not enough.
Probably not enough since it looks like it spun against the outer part of the hub. How tight was it when you removed the nut?
It was tight like normal. I think it must have been a defect
Not enough. Prop needs torqued with a Torque wrench.
I used to torque mine to 55 lbs too...until I snapped a perfect propshaft right behind the carrier and then instant high speed blowout (not fun). Lost a pristine labbed bravo 28 RH too about 25 feet deep. Since that day all my props get torque wrenched to 100 lbs plus castle alignment (Yamaha). Probably around 105-115 lbs by the time I can slide the cotter key in. Haven't snapped one since. Got a counter rotating gear case now...LH props are much safer to torque down and much healthier for the prop too...blocks on the back of the blade instead of the more fragile leading edge. Also you can get some really expensive (labbed) LH wheels for dirt cheap from the twin engine superboat guys...fwiw.
96 Bullet 20cc, Yamaha OX 250+, 10" jack, labbed 30" Bravo LH w/1.25" exhaust pipes, counter rotating Bob's lower, it goes faster when you spin it the other way...
Mercury Marine states that the hub in question, Mercury RACING Hub, must be torqued to 55 lb/ft to properly compress the Belleville washer system.
Mercury Racing is not paying for anybody's broken propshafts either...NO WARRANTY on Mercury Racing gear. Not paying for their props sitting on the bottom of the lake either. You should follow the manufacturer's guidelines just like Savage says...55lbs. You are taking a risk at 54.9 lbs...
Last edited by Bullet 20cc; 10-22-2017 at 08:48 AM.
96 Bullet 20cc, Yamaha OX 250+, 10" jack, labbed 30" Bravo LH w/1.25" exhaust pipes, counter rotating Bob's lower, it goes faster when you spin it the other way...
The op was using a Mercury Racing hub, not a Yamaha
Keith Broussard Caney Lake, Louisiana
2000 TR21 2000 Mercury 250 Pro XB OG980775 14" hydro plate
Very true...55lbs...good luck.
96 Bullet 20cc, Yamaha OX 250+, 10" jack, labbed 30" Bravo LH w/1.25" exhaust pipes, counter rotating Bob's lower, it goes faster when you spin it the other way...
He's also got a 1.25" shaft not a 1"
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