Prop Nuts

Gentlemen,

Without trying to add any confusion to this thread, you might peek thru this article that I put together years back.. It's based on 100's of prop installs on both big and small vessels, fast and slow and over 20++ years of doing it..

Just think of it this way--We build prop shafts to the highest spec from scratch, install prop shafts and custom struts in new construction, deal with commercial trap vessels that shift from forward to reverse well over 1000 times per day and we do not have issues......Strictly what we have seen done by others that did not work even though they followed common marine practices, the understanding of proper machining practices applicable to the real marine world in real life applications, and what works 100% without a glitch..

http://sbmar.com/Articles/Prop_Installation.cfm

Cheers,

Tony

http://www.sbmar.com
 

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sbmar.com said:
Gentlemen,

Without trying to add any confusion to this thread, you might peek thru this article that I put together years back.. It's based on 100's of prop installs on both big and small vessels, fast and slow and over 20++ years of doing it..

Just think of it this way--We build prop shafts to the highest spec from scratch, install prop shafts and custom struts in new construction, deal with commercial trap vessels that shift from forward to reverse well over 1000 times per day and we do not have issues......Strictly what we have seen done by others, the understanding of proper machining practices application in the real marine world in real life applications, and what works without a glitch..

http://sbmar.com/Articles/Prop_Installation.cfm

Cheers,

Tony

http://www.sbmar.com
Click to expand...

Very glad to see you here Tony.
 
I'm a "boatdiesel" fan too. Lots of great info thanks to Tony and others.
 
Take notice that even a CAT owner welcomed Tony .....:grin:
 
Gary,

I have watched this forum for awhile and finally saw something that I thought I could add some value too... Have I missed something about the QSM that got ugly??

I have mine own personal feelings about the QSM (not all 100%) , but if I put those aside and just look at the 30+ or so I watch over very closely with one pair now over 30,000 hours with only general maintenance and a few hang-on replacements) and many at 10,000 +, all I can say is, if the install is right, the application is right, and the maintenance is done per Cummins and our specs, a modern diesel at 11L does not get any better as to reliability, fuel efficiency, and overall cost of ownership....

Fill me in on the concerns.. I'm all ears & and will absolutely will hold nothing back, privvy or not.....

Tony
 
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Wingless,

Prop temp when installing? Same as the shaft would be right.. Prop shafts are usually under the boat and NOT in the sun. Leave a prop in the sun for a hour or so and the bronze wil expand as it gets hot and then when installed on a cold shaft, it can go up on the taper too far making it very difficult to remove down the road.

As to heating a prop to make for and easier removal-- done fast with a rose-bud and brought up to 200 F or so, will do NO damage to the prop, the shaft, or the rubber bearing while allows the prop to be removed with a much smaller hammer..

Tony
 
Tony...what would be the best way to block or hold shaft while loosening or tightening prop nuts to prevent prop damage? thanks, Tom
 
Tightening is easy, just put a wrench on the shaft nut at the transmission against the hull.

Loosen by a wrench on hub nut, against the hub and the hull.
 
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