Replacing yoke/u-joint assembly on Bravo 3

Discussion in 'Gas Engines/Drives/Transmissions/Props' started by Danny Troy, Dec 14, 2019.

  1. Danny Troy

    Danny Troy Member

    840
    Oct 8, 2009
    Candlewood Lake, CT
    2003 280 Sundancer
    496MAG w/genset
    As the title says, I'm replacing the entire yoke/u-joint assembly on my Bravo 3. I noticed a few mentions online of aligning timing marks on the gears, which can be seen after removing the rear cover. Is this procedure necessary when only replacing the yoke assembly? From what I see in the service manual, it's more involved than just removing the cover, since it seems the shift linkage must be removed first. Any advice on this is much appreciated.
     
    Last edited: Dec 15, 2019
  2. Espos4

    Espos4 Well-Known Member

    Jan 1, 2017
    Long Island NY
    2007 240 Sundeck
    350 MAG Bravo 3 W/DTS
    You could use something like this to replace the universal joints without removing the input shaft assembly.
    B409A416-6DEF-45DD-B600-A2D2E1A8F0BC.png
     
  3. Danny Troy

    Danny Troy Member

    840
    Oct 8, 2009
    Candlewood Lake, CT
    2003 280 Sundancer
    496MAG w/genset
    I did get a u-joint/ball joint set from Autozone. One of their loaner sets. I tried doing it, but it was nothing like I ever did on car u-joints, and gave up. Maybe it was because there was a fair amount of rust, from several years of water intrusion. I already have the assembly out, and have the new assembly ready to go in. I'm just waiting for an o-ring and oil seal to be delivered. It's also possible the oil seal or o-ring was leaking, so it's just as well I replace the whole thing and be done with it.
     
    Espos4 likes this.
  4. scoflaw

    scoflaw Well-Known Member

    Aug 10, 2011
    cape cod mass, cape coral fl
    1999 Powerquest legend 260 sx
    502 mpi Bravo 1
    Might as well flip the cone clutch over while you're in there, obviously forward cone gets more wear t h a n the reverse cone
     
  5. techmitch

    techmitch Well-Known Member GOLD Sponsor

    May 1, 2008
    Chesapeake Bay, Middle River/Frog Mortar Creek MD.
    1999 270 DA
    Twin 4.3s W/Alpa I Gen II's
    Interesting. Can the clutch clearances be adjusted while its apart?
     
  6. Danny Troy

    Danny Troy Member

    840
    Oct 8, 2009
    Candlewood Lake, CT
    2003 280 Sundancer
    496MAG w/genset
    As it turns out I probably won't be removing the back cover after all. I stumbled on a post where someone said he was able to see the timing marks from the front. When I checked, sure enough you can see them. I'm glad about this since the three cover bolts were frozen. And even after applying heat they wouldn't budge. I'll do a pressure test to be sure the heat didn't melt any o-rings. Since it's a B3, because of the reservoir system, it will have to wait until it's mounted on the transom.
     
    Last edited: Dec 15, 2019
  7. Espos4

    Espos4 Well-Known Member

    Jan 1, 2017
    Long Island NY
    2007 240 Sundeck
    350 MAG Bravo 3 W/DTS
    There is a spring loaded check valve that should seal shut with the drive removed. This should allow you to do a pressure check without having to reinstall the drive.
     
  8. scoflaw

    scoflaw Well-Known Member

    Aug 10, 2011
    cape cod mass, cape coral fl
    1999 Powerquest legend 260 sx
    502 mpi Bravo 1
    No clearance, it's either in or out
     
  9. scoflaw

    scoflaw Well-Known Member

    Aug 10, 2011
    cape cod mass, cape coral fl
    1999 Powerquest legend 260 sx
    502 mpi Bravo 1
    Roughing up the cup on the gear also while you're in there
     
  10. Danny Troy

    Danny Troy Member

    840
    Oct 8, 2009
    Candlewood Lake, CT
    2003 280 Sundancer
    496MAG w/genset
    Thanks for mentioning that. I thought the only spring loaded check valve was on the bell housing. Sure enough, just checked and there's one on the drive. Nice to know I won't have to wait till Spring to do that pressure test.
    BTW, used some brute force and got the back cover off. Corrosion held the stainless bolts in pretty good. Cleaned them up so next time they will come out easier. All looks dry, so the shift shaft bushing is good.
     
  11. pyro

    pyro Active Member

    178
    Dec 4, 2018
    CT, Long Island Sound
    2008 Sundancer 290
    Twin 5.0L MPI Bravo III
    Kohler 5ecd
    Hi Danny,
    Can you clarify your answer, I have the same exact question. When you say you can see the timing marks from the front, what "front" do you mean? I'm trying to understand which cover(s) need to come off to remove and install the driveshaft yoke.
     
  12. Danny Troy

    Danny Troy Member

    840
    Oct 8, 2009
    Candlewood Lake, CT
    2003 280 Sundancer
    496MAG w/genset
    This thread may shed some light. I'm pretty sure you may need to remove the top cover, because once you insert the yoke there is no way to tell if the timing marks are still lined up.
    https://www.offshoreonly.com/forums...timing-marks-still-cant-get-set-up-right.html
     
    Last edited: May 10, 2020
  13. Seapig

    Seapig Active Member

    118
    Dec 25, 2018
    Oakham MA or Winnipesaukee NH
    12 Sundancer 310 w Axius
    Twin 350 Mags w Bravo drives
    Cone clutch ? I thought the B-3 has dog clutches.
     
  14. scoflaw

    scoflaw Well-Known Member

    Aug 10, 2011
    cape cod mass, cape coral fl
    1999 Powerquest legend 260 sx
    502 mpi Bravo 1
    Nope. No covers need to come off to remove the shaft, it's held in with that big nut with all the slots on it. No need to be concerned about timing marks when installing it.
     
  15. pyro

    pyro Active Member

    178
    Dec 4, 2018
    CT, Long Island Sound
    2008 Sundancer 290
    Twin 5.0L MPI Bravo III
    Kohler 5ecd
    So I assume timing marks are only if you mess with the shift mechanism.
    Sounds like you just need a spanner wrench for the spanner nut you refer to which you can find cheap on ebay $30, and the precision torque gauge for setting the rolling torque is about $150.
     
  16. scoflaw

    scoflaw Well-Known Member

    Aug 10, 2011
    cape cod mass, cape coral fl
    1999 Powerquest legend 260 sx
    502 mpi Bravo 1
    Once the yoke is out you could screw up the timing if you moved the gears. So do not disturb
     

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