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  1. #1

    Default New and have out drive question(s)

    Hi,

    I have a 1992 Glastron with a Volvo duo-prop. Its a 431B 868629 (?what that 868# means). V6 4BBL. S/N 41001365XXX. I think it's a DP-C unit. I've owned since 2007 and am the second, freshwater only owner. The silver plate on the top of the upper unit has lost any of its ID #'s. The plastic cover over the carb. has lost most of the ID numbers as well. At one point, I have written DP-C in a book I have, so I'm thinking that was visable at one point.

    So, my upper drive bellows ripped and I need to replace the u joints as both rusted a bit. I think it broke over the winter (upstate ny) and snow got in there. I swear it wasn't ripped when I cleaned the stern last Fall; who knows.

    So, I wen ahead and removed the drive gear from the upper unit by removing the 4 hex bolts. I carefully noted the order and positioning of the 3 shims. The o-ring needs to be replaced on both the drive shaft and the gear housing, but otherwise the bearing assy,drive gear and movements all seem very good. I did remove the 7/16" bolt and cone washer to get the shaft out for u-joint replacements. Do I been to pre-load prior to re-assy? what are the torque specs for the hex bolts and the 7/16 bolt? Or, am I completely wrong?

    Thank you!
    Tom


  2. #2
    Join Date
    Jun 2008
    Location
    Island Heights, NJ,
    Posts
    3,252

    Default Re: New and have out drive question(s)

    Going forward... these bellows require routine replacement. Every 2 to 3 seasons for worry free (low cost) boating.... Use Volvo OEM only. For best life, leave drive down when not using the boat. Lift drive only when trailering or for maintenance.
    Capt Bob
    1969 23ft ChrisCraft Lancer
    Merc 5.7L 260HP/ Volvo 280

  3. #3
    Join Date
    Mar 2009
    Location
    Portland, Oregon,
    Posts
    11,869

    Default Re: New and have out drive question(s)

    ......................
    Quote Originally Posted by commuter64 View Post
    Hi,

    I have a 1992 Glastron with a Volvo duo-prop. Its a 431B 868629 (?what that 868# means). V6 4BBL. S/N 41001365XXX. I think it's a DP-C unit. I've owned since 2007 and am the second, freshwater only owner. The silver plate on the top of the upper unit has lost any of its ID #'s. The plastic cover over the carb. has lost most of the ID numbers as well. At one point, I have written DP-C in a book I have, so I'm thinking that was visable at one point.

    So, my upper drive bellows ripped and I need to replace the u joints as both rusted a bit. I think it broke over the winter (upstate ny) and snow got in there. I swear it wasn't ripped when I cleaned the stern last Fall; who knows.
    If by chance it failed during your last outing, water may have entered your PDS bearing.
    While you have the transmission off for bellows replacement, you may as well replace the PDS bearing!
    The bearing itself will run you about $16, and the seal about $8.
    These are industry standard parts....... so there is no need to go through Volvo Penta.
    A good bearing supplier can sell you the exact same parts.


    So, I wen ahead and removed the drive gear from the upper unit by removing the 4 hex bolts. I carefully noted the order and positioning of the 3 shims. The o-ring needs to be replaced on both the drive shaft and the gear housing, but otherwise the bearing assy,drive gear and movements all seem very good. I did remove the 7/16" bolt and cone washer to get the shaft out for u-joint replacements. Do I been to pre-load prior to re-assy?
    The pre-load will be done once the new seal and male yoke are back in place.
    The OEM work shop manual will show you two torque specs: one for new bearings and one for "run-in" bearings.
    If you did not replace the two bearings, use the "run-in" specs.
    Hopefully you measured the existing pre-load (i.e., your "run-in" value), and will be able to slightly increase it now.
    The "book" suggests replacing the crush sleeve and the bolt with new.
    However (and you will not see this in the book), since "run-in" bearing pre-load has diminished some, this is why you can safely bring the pre-load back up a bit.



    what are the torque specs for the hex bolts and the 7/16 bolt? Or, am I completely wrong?

    As you torque the bolt, the crush sleeve will collapse, giving you a small amount of increased rolling torque. The bolt tension will be sufficient once the value is reached.


    Thank you!
    Tom


    As Bob suggested, store the boat with the drive down and aiming straight forward.
    Lift the drive no more than need be when on the trailer.
    Do this, and you will extend the life of your drive shaft bellows.




    .
    Last edited by RicardoMarine; 05-23-2020 at 06:18 AM.
    Rick ... aka Ricardo..... AQ series Volvo Penta repair
    Portland, Oregon
    28' SDN F/B w/ twin Volvo Penta 5.7L DP drives

    "Intellectual growth should commence at birth and cease only at death." Albert Einstein

    Please... no PMs! Post your questions on the forum.

  4. #4

    Default Re: New and have out drive question(s)

    Thank you for the detailed response, Ricardo! Did did not measure the pre-load. After further inspection, it looks like the C-Clip is rusted, so I will take your advice and replace components. I've been looking for a Volvo shop manual ; not sure which one I should get. From Volvo, my S/N returns: AQ205 for 431, 432 ,433 , 434. Would you have input here?

    Thanks again
    Tom

  5. #5
    Join Date
    Jun 2008
    Location
    Island Heights, NJ,
    Posts
    3,252

    Default Re: New and have out drive question(s)

    Quote Originally Posted by commuter64 View Post
    I've been looking for a Volvo shop manual ; not sure which one I should get.

    Thanks again
    Tom

    PM me your email address....
    Capt Bob
    1969 23ft ChrisCraft Lancer
    Merc 5.7L 260HP/ Volvo 280

  6. #6
    Join Date
    Mar 2009
    Location
    Portland, Oregon,
    Posts
    11,869

    Default Re: New and have out drive question(s)

    If you acquire an OEM Service or Work Shop manual, be sure to look at the section that pertains to a C or later transmission..... (i.e., post A transmission)!

    No Seloc, and no Clymer! OEM ONLY!



    You should have this transmission:

    http://www.marinepartseurope.com/en/...t-7742810.aspx



    .
    Last edited by RicardoMarine; 05-23-2020 at 11:10 AM.
    Rick ... aka Ricardo..... AQ series Volvo Penta repair
    Portland, Oregon
    28' SDN F/B w/ twin Volvo Penta 5.7L DP drives

    "Intellectual growth should commence at birth and cease only at death." Albert Einstein

    Please... no PMs! Post your questions on the forum.

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