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Results 1 to 18 of 18
  1. #1
    Join Date
    Apr 2011
    Location
    the delta, ca
    Posts
    18

    Default prop shaft length??

    i have a 1985 aq125b w/270 outdrive. to order a new prop i need to know the shaft length..how would you measure the length of the shaft. mine has two sets of numbers, one is a part# a16142, the other the prop info i guess, 14r19mwc,, thanks kc

  2. #2
    Join Date
    Jul 2006
    Location
    Sacramento, CA, USA
    Posts
    591

    Default Re: prop shaft length??

    Click image for larger version. 

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    1972 17' Delta V-Hull Runabout
    AQ130C / 270

  3. #3
    Join Date
    Apr 2011
    Location
    the delta, ca
    Posts
    18

    Default Re: prop shaft length??

    heres what i am looking at, doesnt really show like the schematic drawingClick image for larger version. 

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  4. #4
    Join Date
    Jul 2006
    Location
    Sacramento, CA, USA
    Posts
    591

    Default Re: prop shaft length??

    What is the distance between the top of the threaded shaft and the light colored flange?
    1972 17' Delta V-Hull Runabout
    AQ130C / 270

  5. #5
    Join Date
    Apr 2011
    Location
    the delta, ca
    Posts
    18

    Default Re: prop shaft length??

    4 5/8 "

  6. #6
    Join Date
    Jul 2006
    Location
    Sacramento, CA, USA
    Posts
    591

    Default Re: prop shaft length??

    My guess would be that it is a short shaft but I would not buy a short hub prop until you get a second opinion from someone else here.
    1972 17' Delta V-Hull Runabout
    AQ130C / 270

  7. #7
    Join Date
    Apr 2011
    Location
    the delta, ca
    Posts
    18

    Default Re: prop shaft length??

    thnks, i see by reading the long long shaft is the top seller...thanks again kc

  8. #8
    Join Date
    Jul 2006
    Location
    Sacramento, CA, USA
    Posts
    591

    Default Re: prop shaft length??

    I just found some pics of the short shaft and a short shaft prop on my 270 that you can compare which might be of help:

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    In the first pic, the bottom of the tape measure is against a spacer which does not appear in your pic. It was on the drive all along in it's almost 40 year life until last year when I installed a line cutter on the drive for the first time.
    Last edited by am_dew; 09-19-2011 at 11:55 PM.
    1972 17' Delta V-Hull Runabout
    AQ130C / 270

  9. #9
    Join Date
    Apr 2011
    Location
    the delta, ca
    Posts
    18

    Default Re: prop shaft length??

    does yous have the spacer between the cone and prop?

  10. #10
    Join Date
    Jul 2006
    Location
    Sacramento, CA, USA
    Posts
    591

    Default Re: prop shaft length??

    If by "spacer" you mean this part, then yes.

    1972 17' Delta V-Hull Runabout
    AQ130C / 270

  11. #11
    Join Date
    Apr 2011
    Location
    the delta, ca
    Posts
    18

    Default Re: prop shaft length??

    ok thanks looks like i have the short shaft, the more expensive one...kc

  12. #12
    Join Date
    Jul 2006
    Location
    Sacramento, CA, USA
    Posts
    591

    Default Re: prop shaft length??

    From what I understand, you can use a long hub prop on a standard shaft if you have an internally threaded shaft and you don't use the spacer pictured above. So, instead of using a tabbed washer that interlocks with the indents in the spacer, you use a long bolt threaded into the end of the prop shaft to secure the prop.
    1972 17' Delta V-Hull Runabout
    AQ130C / 270

  13. #13
    Join Date
    Apr 2011
    Location
    the delta, ca
    Posts
    18

    Default Re: prop shaft length??

    mine doesnt have the tabbed washer, it has the bolt threaded thru the end..

  14. #14
    Join Date
    Jul 2006
    Location
    Sacramento, CA, USA
    Posts
    591

    Default Re: prop shaft length??

    Assuming you were previously using the spacer between the cone and the prop, if you remove the spacer, you may be able to use a long hub prop. I'd ask a prop seller to measure the depth of a standard hub prop and a long hub prop and see how they compare to determine if the long hub prop with cone sans spacer will work or not.

    Click image for larger version. 

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    1972 17' Delta V-Hull Runabout
    AQ130C / 270

  15. #15
    Join Date
    Mar 2009
    Location
    Portland, Oregon,
    Posts
    7,227

    Default Re: prop shaft length??

    KB, let me add some clarity for you if I may.

    In post #2 above, the schematics can confuse some owners in that they mention "Short Shaft" "Long Shaft"!

    The 250, 270 and 275 all offer one exposed shaft length (when absent the spacer/line cutter).
    The 280, 285, 290, SP and several others, all offer another exposed shaft length (when absent the spacer/line cutter).

    Here is what's commonly misunderstood:
    The 250, 270 and 275 all require the short spacer/line cutter.
    The 280, 285, 290, SP and several others, all require the long spacer/line cutter.

    Hre is the important part: Either nets the exact same exposed prop shaft spline dimension, but only when the correct and mandatory spacer is used.

    With only one limitiation, this means that any hub prop (long or short) can be used on any of these lower units.
    The exception is when we get into the long hub prop on an early lower unit that does not have the internally threaded prop shaft.
    This has everything to do with the style of spinner (aka cone nut) keeper or locking system.

    Since the long hub prop prevents the shaft from sitting "proud" of the hub, the SS tab washer can not be used.
    This limits us to using the center keeper bolt.
    The center keeper bolt works only with a threaded prop shaft (275, 280, 285, 290 etc).

    IOW, without the internal threads (250, 270), the AFT-most portion of the 2 pc spinner cannot be used with a long hub propeller.
    Well, it could, but we'd have no means of locking it!

    If you indeed have a 1985 drive, it is more likely a 275 drive...... not a 270.
    All 275 lower unit prop shafts offer the internal threads, and the exhaust outlet that is placed further AFT.
    If you have a 275 (sounds like you do), this would mean that you have more propeller choice options.


    NOTE: The spacer/line cutter must be used! No exceptions when using a propeller designed for these V/P drives!
    The spacer/line cutter must be correct for the drive model, not the propeller!

    NOTE: The sum of both halves of the 2 pc spinner, equals the 1 pc spinner dimensionally.
    Difference being, that the AFT-most part (of the 2 pc spinner) reaches into the long hub propeller in order to fully thread onto the propeller shaft.
    Without this, the long hub propeller cannot be used.

    Point being... don't confuse yourself between prop shaft lengths!
    As said, all of these net the same dimension of shaft splines when the correct and mandatory spacer is used.

    Instead, concern yourself with the correct spacer/line cutter, the hub length and the type of spinner that can be used.
    The 2 pc spinner gives you more options, but again, only if your prop shaft is internally threaded since the SS tab washer can't be used with the long hub.

    Make sense?

    .
    Last edited by RicardoMarine; 09-20-2011 at 08:57 AM.
    Rick ... aka Ricardo
    Portland, Oregon
    28' SDN F/B w/ twin Volvo Penta 5.7L DP's

  16. #16
    Join Date
    Apr 2011
    Location
    the delta, ca
    Posts
    18

    Default Re: prop shaft length??

    ricardo, as you can see mine says 270, it has the line cutter spacer and a spacer between the prop and the spinner.. it also is threaded for the bolt to lock the spinner. am i understanding the the long hub could be used with the right line cutter/spacer?Click image for larger version. 

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  17. #17
    Join Date
    Mar 2009
    Location
    Portland, Oregon,
    Posts
    7,227

    Default Re: prop shaft length??

    Quote Originally Posted by kbcave View Post
    ricardo, as you can see mine says 270, it has the line cutter spacer and a spacer between the prop and the spinner.. it also is threaded for the bolt to lock the spinner.

    am i understanding the the long hub could be used with the right line cutter/spacer?
    KB, yes, you are correct!

    The shift cover on your drive may be from an entirely different drive since these all interchange within this style.
    IOW, a 250 cover will fit a 280 and visa-versa, and so on.
    So I'd not trust this alone!

    The fact that your prop shaft is internally threaded, tells me that it is a 275... not a 270.... at least not the lower unit.
    The 270 was not threaded this way!

    Also, if your transmission has the oil fill plug @ 2:00 O'clock position over the shift mechicanism, it will likely be the 275.
    If no oil fill plug, it is likely a 270.

    I've not tried this, so I am taking an educated guess, but if a short spacer was used on a 280, for example, the prop (regardless of long/short hub) would contact the 280 ring anode.
    So we have to understand that the prop shaft dictates the spacer/line cutter.... not the other way around.
    Again, and excuse the redundancy:
    250, 270, 275 all use the short spacer, and if you'll notice, the ring anode is also short.
    280, 285, 290 all use the long spacer, and the ring anode is also longer.... much lilke the Duo Prop ring anode.

    I think that the key in understanding this, is to realize that either of these prop shafts net the same length of splined shaft, but only when the correct spacer is used.

    In your case, you are wide open to an array of props..... both long and short hub.
    • Short hub = full spinner (be it 1 pc or 2 pc) and the locking bolt and/or the SS tab washer .
    • Long hub = aft section ONlY of the 2 pc spinner and the locking bolt only.
    Bottom line.... by golly I think you've got it!

    Don't feel bad..... this has stumped many!
    Last edited by RicardoMarine; 09-21-2011 at 11:59 AM.
    Rick ... aka Ricardo
    Portland, Oregon
    28' SDN F/B w/ twin Volvo Penta 5.7L DP's

  18. #18
    Join Date
    Mar 2009
    Location
    Portland, Oregon,
    Posts
    7,227

    Default Re: prop shaft length??

    Kevin, I see that you posted this on another forum, and I just read the thread and the thread linked to.
    The one guy was not aware that the spacer was even attached (minus the line cutter) to his prop shaft.
    Just make sure that you varify the information that you're getting.


    .
    Rick ... aka Ricardo
    Portland, Oregon
    28' SDN F/B w/ twin Volvo Penta 5.7L DP's

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