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  1. #1
    Join Date
    Jan 2016
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    CA
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    392

    Default Repacking shaft - alignment seems way off (2005 luhrs)

    Got down to a customers boat today - mentioned the tranny started screeching (he was at idle) and turned straight back to the dock.. pulled out first string of old flax - it was black charred and clearly over heated. He also stated not seeing any drips (its not a dry style)..

    Noticed the gap on top and bottom where shaft comes through is about 1/16 different, so much so that im not sure the flax will get in on top. I didnt have time to remove the shaft at the tranny to check the alignment - soaked rusty nuts overnight with pb blaster - the mounts on the stringers are bottomed out - the design used raised connections and puts everything about 1" above the stringers already - so there is no way to drop it much more.. like they set the height of the stringers and then when they added the raised side mounts ran out of adjustment -

    Is there a possibility to try align the motor/tranny by dropping the side mounts (re-position) to buy som drop and have this work? or should it be hauled and complete shaft inspected?

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    Last edited by FstaRockr Burns; 06-02-2021 at 11:54 PM.

  2. #2
    Join Date
    Sep 2008
    Location
    Maryland - USA
    Posts
    8,870

    Default Re: Repacking shaft - alignment seems way off (2005 luhrs)

    If you don't have any history on the hull, I'd suggest a short haul and a complete inspection of the shaft and strut as well...and i'd check the shaft to log clearance - if its not right, the stuffing box will be marginal....

    Without a few pictures of the mounting scheme its hard to say...usually, if the hull was rigged correctly, there's few calls for motor mount relocation...

  3. #3
    Join Date
    Sep 2003
    Location
    New Tripoli, PA, USA!
    Posts
    17,175

    Default Re: Repacking shaft - alignment seems way off (2005 luhrs)

    I used Teflon packing on my old inboard and it worked great for years.


    Jeff

  4. #4
    Join Date
    Sep 2010
    Location
    Jersey Shore
    Posts
    6,250

    Default Re: Repacking shaft - alignment seems way off (2005 luhrs)

    You do not align an inboard by centering the shaft in the log..... You align an inboard with a feeler gauge at the coupler.
    Chris
    Dockside Marine Services
    Jersey Shore.
    Mercruiser/Mercury Certified
    Let the insanity begin.

  5. #5
    Join Date
    Jan 2016
    Location
    CA
    Posts
    392

    Default Re: Repacking shaft - alignment seems way off (2005 luhrs)

    Yes i know that - i was only assuming the alignment is off, i didnt have time to disengage the flange at the transmission. I was noting that *IF* the VERTICAL alignment is out and adjustment is required by lowering the trans/motor then there is no room for that- ie if I remove the flange and the "feeler" gauge alignment is correct, but the trans/motor sits higher then I might have to consider lowering the mounts to gain adjustment. This is all speculation - I will remove the flange later and see - Im just concerned as to why the shaft and flax housing would be so out of alignment.. I would presume the opening around the shaft should be equal all around-

    fwiw I have checked and set alignment on these, but never seen a shaft at such an angle and getting some feedback..



    Quote Originally Posted by Docksidemarineservices View Post
    You do not align an inboard by centering the shaft in the log..... You align an inboard with a feeler gauge at the coupler.
    Last edited by FstaRockr Burns; 06-03-2021 at 01:07 PM.

  6. #6
    Join Date
    Jun 2008
    Location
    Island Heights, NJ,
    Posts
    3,622

    Default Re: Repacking shaft - alignment seems way off (2005 luhrs)

    Quote Originally Posted by FstaRockr Burns View Post
    Got down to a customers boat today - mentioned the tranny started screeching (he was at idle) and turned straight back to the dock.. pulled out first string of old flax - it was black charred and clearly over heated. He also stated not seeing any drips (its not a dry style)..

    Noticed the gap on top and bottom where shaft comes through is about 1/16 different, so much so that im not sure the flax will get in on top. I didnt have time to remove the shaft at the tranny to check the alignment - soaked rusty nuts overnight with pb blaster - the mounts on the stringers are bottomed out - the design used raised connections and puts everything about 1" above the stringers already - so there is no way to drop it much more.. like they set the height of the stringers and then when they added the raised side mounts ran out of adjustment -

    Is there a possibility to try align the motor/tranny by dropping the side mounts (re-position) to buy som drop and have this work? or should it be hauled and complete shaft inspected?

    Click image for larger version. 

Name:	85cd2d06-7271-49fd-b610-bd15469ff0e6.jpg 
Views:	22 
Size:	141.0 KB 
ID:	26993

    Click image for larger version. 

Name:	7976359a-8f9b-4385-9810-39f3ac1fc9bb.jpg 
Views:	26 
Size:	199.6 KB 
ID:	26994
    Per other posts, alignment is in reference to the coupler, not the shaft...That said, there appears to be a shaft issue. The first place I'd look is at the strut @ the prop... Possible replaced with a different than original.and or improperly installed/ missing shim???
    Capt Bob
    1969 23ft ChrisCraft Lancer
    Merc 5.7L 260HP/ Volvo 280

  7. #7
    Join Date
    May 2010
    Location
    DC Burbs/Maryland Eastern Shore
    Posts
    2,175

    Default Re: Repacking shaft - alignment seems way off (2005 luhrs)

    What happens is that the hose used for the connection between the shaft tube and the stuffing box gets off center. There's enough "give" in the packing material that it seals well enough even tho it looks way off. I'm no judge but it looks like that should all be cleaned up and a new hose and clamps at the very least. Ditch those crappy hardware store hose clamps and use AWAB clamps. Gore-tex packing is the shizzle but it's kind of a different beast and takes some trickery to get it in there The hose shouldn't have wire reenforcement, just plain shields hose without wire.
    Last edited by o2batsea; 06-04-2021 at 11:08 AM.
    Practicing the ancient art of ren-ching

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