| Author |
Message |
    
Allen Cox
Member
Username: jaxworks
Post Number: 6
Registered: 04-2009
| | Posted on Thursday, June 25, 2009 - 10:44 pm: | 
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Is there a way to change a short shaft 270 outdrive to long hub? I have several SS props I could use but they are all long hub props and my outdrive is short hub. Any suggestions? |
Morten Ringvold
Senior Member
Username: haffiman37
Post Number: 3835
Registered: 04-2006
| | Posted on Thursday, June 25, 2009 - 11:00 pm: |
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Pull the prop-shaft. Take it to a machine shop and have the drill and thread the hole for the locking screw for the 'long-hub' cone. |
Allen Cox
Member
Username: jaxworks
Post Number: 7
Registered: 04-2009
| | Posted on Thursday, June 25, 2009 - 11:59 pm: |
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I own a machine shop...and the shaft in the 'short hub' outdrive right now is threaded. So exactly what mods need to be done? |
Morten Ringvold
Senior Member
Username: haffiman37
Post Number: 3837
Registered: 04-2006
| | Posted on Friday, June 26, 2009 - 12:21 am: |
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You need the cone with center screw, or as Yo have a machine shop, put on a long-hub prop, and machine You prop cone to fit. Then install the center locking screw in the prop cone.
You may have to do some 'modification' to the exhaust outlet, but test will show. |
Ricardo E.
Advanced Member
Username: ricardomarine_vp
Post Number: 336
Registered: 03-2009
| | Posted on Friday, June 26, 2009 - 09:21 am: |
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Allen, The net length of the propeller shafts (250/270/275 vs 280/290, for example)
are the same, it is the prop Hub length that changes between the short/long hub propellers!
The propeller will not know which drive it is being installed on unless you tell it!
You must also use the correct line cutter/spacer for the "Shaft". These are "Shaft Specific", not "Prop Specific".
These DO NOT interchange between the 250/270/275 and a 280/290 for example.
Morten is correct..... in order to use the spinner center "locking bolt", the prop shaft will need to be internally threaded at the end. (a 275 drive will be)
Now you can use the "aft half" only of the two piece spinner nut for the Long Hub propeller!
If you have a prop blade conflict with the exhaust outlet, switch to the 275 style outlet.
For some reason, I'm thinking that the actual body portion of it mounts further AFT by a small amount.
Probably more info than needed..... hopefully any on-lookers will benefit from it! |
Allen Cox
Member
Username: jaxworks
Post Number: 8
Registered: 04-2009
| | Posted on Friday, June 26, 2009 - 12:12 pm: |
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Thanx for the info...you mention that the prop shaft needs to be internally threaded...mine is already internally threaded even tho my hubs are the short (3 inch) ones. Do you mean the threads need to be deeper that they are now? |
Robert A. Fierro
Advanced Member
Username: sandkicker
Post Number: 641
Registered: 06-2008
| | Posted on Friday, June 26, 2009 - 04:15 pm: |
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No, earlier prop shafts have no threads in the end at all. |
El Pescador
Senior Member
Username: el_pescador
Post Number: 4543
Registered: 02-2006
| | Posted on Friday, June 26, 2009 - 04:29 pm: |
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Ricardo & Robert, didn't earlier 200 series outdrives (250 & some 270) have slightly shorter shafts? Please check page 36 (50 of 96) of this link:
http://www.miwheel.com/FilesCustom/HTMLEditor/Files/MWC%20-%20OBSD%2009.pdf |
Robert A. Fierro
Advanced Member
Username: sandkicker
Post Number: 644
Registered: 06-2008
| | Posted on Friday, June 26, 2009 - 05:55 pm: |
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Could be... I put a long hub prop on a 250 drive once. The prop had slots in it to get at the tabs so neither the cone nor the shaft were drilled.
It was a major pain to bend any tabs.
Eventually, I got fed up and ended up taking a round file to the prop and carefully elongated the slots each about 1/4 inch. |
Ricardo E.
Advanced Member
Username: ricardomarine_vp
Post Number: 341
Registered: 03-2009
| | Posted on Saturday, June 27, 2009 - 01:33 pm: |
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El P, re; the pdf file! That does show a nice view of the shafts at the very bottom of page 36.
And that is where this can get confusing for some people when they see this.
So...... we must remeber that of the two shaft types, each uses one of two length spacers available....(short/long).... which with the correct spacer, the shafts net the same usable spline area.
As for the 200..... not sure!
I do know that the 250 shaft exposure is same as a 270. And Yes, these shafts were w/out lock bolt threads!
Robert, a long hub prop with slots would appear to be useless........ W/ the long hub prop installed, there are no extended shaft splines for the SS locking tab washer to catch!
This is why the aft portion of the two pc "Spinner" must reach into the hub some.
Now you've got to use the locking bolt! Or ?????
. |
