Replacing cutless bearings

Discussion in 'General Maintenance/Repair Questions' started by dtfeld, Dec 3, 2021.

  1. dtfeld

    dtfeld Water Contrails

    Jun 5, 2016
    Milton, GA
    410 Sundancer
    2001
    12" Axiom and 9" Axiom+ MFD
    Cat 3126 V-Drives
    I hauled out Tuesday to get a list of bottom projects done in the off season. One of those jobs was to get the props off and tuned and replace the cutless bearings. I had previously noticed that the shaft was hard to turn by hand, but there was no side to side or up-down play in the shaft at the bearing, nor any vibration which are the classic signs of needing new cutless bearings.

    In prep for the job, I followed Strecker25's (thank you Ryan!!) lead as he had done this last year. He had purchased a Strut Pro set up for the combination of shaft/cutless bearing on the 410's (1-3/4" shaft, 2-3/8" OD bearing), and he was kind enough to lend me the tool. If your contemplating doing this job yourself, strut pro is the way to go!

    First order of business was to get the Props off, and this was pretty simple as the Strut pro had an attachement to do just this thing. Installed the strut Pro, tightened it up and a good whack with a 5lb sledge and they were both off in about an hour.

    20211130_122306.jpg

    20211130_123246.jpg

    Next, I wanted to get the old bearings out. First I had to get the set screws loose which turned out to be the bitchy part of the job (I had to drill a couple of them out and chase the threads). On the first bearing, I didnt realize there were 2 set screws, but the Strut Pro pushed the old bearing out no problem. I got both set screws ofF the other and punched it out as well. All in, took about 6 hours to get both props off and both old bearings pulled.

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    Had a nice sunset over the lake to reward my efforts.

    20211201_171949.jpg
     
    Last edited: Dec 4, 2021
  2. Cocktail Time

    Cocktail Time Well-Known Member SILVER Sponsor

    Jul 9, 2007
    Lake Lanier, GA
    1998 400 Sundancer, Garmin 840xs GPS, Furuno Radar, B&G GPS pilot etc.
    Cat 3116's, Westerbeke 7.6 BTD
    You in the yard at Aqualand? Thanks for posting this. The strut pro seems like the way to go.
     
    dtfeld likes this.
  3. dtfeld

    dtfeld Water Contrails

    Jun 5, 2016
    Milton, GA
    410 Sundancer
    2001
    12" Axiom and 9" Axiom+ MFD
    Cat 3126 V-Drives
    Yesterday, I installed the new bearings, and Strut Pro made that really easy. The trick to this is to keep your bearing on ice to get them to contract just slightly and then using the Strut Pro to push them home. Having them chilled allowed the bearing to slide easily into the strut, and required so little force I could almost turn the Strut Pro by hand. The hardest part was all the strokes of the 3/4" ratchet to get these out and back in...its a lot a turning of a wrench!

    2 new 1/4"-20 x 1/4 stainless set screws on each side and I am done!!

    Shaft turns nice and smooth by hand.

    20211202_140510.jpg 20211202_141218.jpg 20211202_141949.jpg
     
    Last edited: Dec 3, 2021
    OllieC, Chris-380 and Njlarry like this.
  4. dtfeld

    dtfeld Water Contrails

    Jun 5, 2016
    Milton, GA
    410 Sundancer
    2001
    12" Axiom and 9" Axiom+ MFD
    Cat 3126 V-Drives
    Yes Aqualand.
     
    Cocktail Time likes this.
  5. firecadet613

    firecadet613 Well-Known Member

    May 10, 2007
    Indiana
    2007 Four Winns V358
    Twin VP 5.7GXi V-Drive / ZF63s
    Awesome and glad you were able to get it to work. On my freshwater only boat, I couldn't get them off with strutpro. The marina had to end up pulling my strut and pressing the old cutlass bearing out on a press. Definitely a pita....but for those not frozen in place, strutpro is amazing.
     
  6. brewster16

    brewster16 Well-Known Member SILVER Sponsor

    913
    Aug 9, 2009
    Long Beach Island, N.J.
    '07 44 Sundancer
    Twin Cummins QSC 8.3
    Nice write up.....appreciated!
     
    dtfeld likes this.
  7. Njlarry

    Njlarry Active Member

    216
    May 9, 2021
    Chesapeake bay
    2000 400 DB
    Cat 3126
    Thank you for the info and pics!
    Do you plan to check taper to prop fit with prussian blue and valve grinding compound? Marinehowto.com is a great help for that. I am not sure the factory ever did this.
     
    dtfeld and firecadet613 like this.
  8. The Bill Collector

    The Bill Collector Well-Known Member GOLD Sponsor

    Jun 2, 2008
    Tacoma, WA
    1998 450 Sundancer, Achilles dinghy w/15hp
    3126 Cat's
    I used a cordless impact driver...
     
    dtfeld likes this.
  9. GnrlPatton

    GnrlPatton Active Member PLATINUM Sponsor

    474
    Jul 12, 2010
    Maple Valley, WA
    Current: 1998 370 Express Cruiser
    Sold:1988 230 Weekender
    Twin Cat 3116T
    This brings back memories from 2 years ago when I did mine. Agreed about the set screws, on my first one I didn't realize there were 2 until I got the bearing out and saw a nice shiny groove down one side of it.

    I've offered this before but will again, anyone in the Seattle/Puget Sound area looking to do the same thing, you are welcome to borrow my StrutPro!
     
  10. The Bill Collector

    The Bill Collector Well-Known Member GOLD Sponsor

    Jun 2, 2008
    Tacoma, WA
    1998 450 Sundancer, Achilles dinghy w/15hp
    3126 Cat's
    I used a Sawzall and made sure the set screws were out... My strut pro was bought @ Home Depot for under $10 (homemade).
     
    kvduff and firecadet613 like this.
  11. dtfeld

    dtfeld Water Contrails

    Jun 5, 2016
    Milton, GA
    410 Sundancer
    2001
    12" Axiom and 9" Axiom+ MFD
    Cat 3126 V-Drives
    If you can build one for $10, that's awsome. For what it is, strut pro is fairly priced IMHO.
     
    The Bill Collector likes this.
  12. Strecker25

    Strecker25 Well-Known Member PLATINUM Sponsor

    Nov 20, 2014
    Rochester, NY
    2002 410DA
    Caterpillar 350HP 3126
    Well done @dtfeld! Happy to have lent the tool out. Njlarry made a good point I forgot to mention…I lapped the props when I got them back from Ray. They weren’t off by much but I did have to use a little valve grinding compound to get perfect mating of the two surfaces
     
    OllieC, Chris-380 and dtfeld like this.
  13. dtfeld

    dtfeld Water Contrails

    Jun 5, 2016
    Milton, GA
    410 Sundancer
    2001
    12" Axiom and 9" Axiom+ MFD
    Cat 3126 V-Drives
    Props have been tight and running very well, so not sure how for off I am. Time permitting I may look at this.
     
  14. Strecker25

    Strecker25 Well-Known Member PLATINUM Sponsor

    Nov 20, 2014
    Rochester, NY
    2002 410DA
    Caterpillar 350HP 3126
    Seems like you’ve had a busy week:)

    I figured there was a chance the bore got a little worked over depending on how they lock them down during repitch so I wanted to verify. Prussian blue is available at most auto zones and is really easy to smear on and check for fit. As I understand it, if they’re not lapped properly you can cause a premature fracture in the shaft from uneven pressure.
     
    dtfeld likes this.
  15. dtfeld

    dtfeld Water Contrails

    Jun 5, 2016
    Milton, GA
    410 Sundancer
    2001
    12" Axiom and 9" Axiom+ MFD
    Cat 3126 V-Drives
    Then I think this is worth taking a look. Doesnt seem to take much more time to do it right.
     

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