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  1. #1
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    Jul 2017
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    Default Preparing for Swivel Case and Mount Frame replacement

    1995 BF45

    My mount frame is rusted to the point of not having confidence in it's strength (what a terrible design...). Last weekend I was hammering out the top tilt cylinder pin and large chunks of rusted mount frame were falling off.

    The correct mount frame for my outboard is no longer available, but the 2004+ mount frame is. Comparing parts lists, the 2004 BF40 and 1995 BF45 share almost all parts. The parts not shared (relevant to this project) are the Swivel Case, Mount Frame and Stern Brackets. I lucked out and found the correct Stern Brackets and Swivel Case on ebay (in near new condition). Will order a new Mount Frame and Lower Mount Center Housing as well as a few oddball parts.

    Does this sound like the correct procedure?

    - Remove lower unit, throttle cable and shift cable
    - Support engine with overhead lift
    - Remove Upper Rubber Motor Mount Nuts
    - Remove Lower Motor Mounts
    - Lift off outboard
    - Remove tilt cylinder, Pivot (steering) tube, Swivel Case and Stern Brackets
    - Re-assemble

    I do have the correct Honda shop manual. Any "Gotchas" I should watch for? I'm hoping that by replacing the Swivel Case and Lower Mount Center Housing I'm eliminating most of the expected problems with seized components. Any parts that should be replaced while I'm in there?

    Thanks for any insight!

    Matt

  2. #2
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    Default Re: Preparing for Swivel Case and Mount Frame replacement

    I'm pushing a bit deeper into the fray...

    I found a new - takeoff, complete transom mount, swivel, mount frame, trim tilt assembly. Off a 2007 BF50...

    I'm 95% sure it will directly bolt to my motor/mid-section. I'm not so sure about the wiring of the tilt/trim and the trim angle sensor. I think the newer engines use the ECM to drive the trim tilt as opposed to the older models using relay/control module. I figure it just needs switched power. Can't be that difficult to figure out, right?

  3. #3
    Join Date
    Nov 2009
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    temecula, ca., usa
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    Default Re: Preparing for Swivel Case and Mount Frame replacement

    Hi,
    Yes, it's just a matter of switching 12 v to the motor while reversing polarity at the same time.

  4. #4
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    Default Re: Preparing for Swivel Case and Mount Frame replacement

    Getting closer, waiting for a few more parts.

    Yesterday I started pre-soaking with PB Blaster to improve my chances. I noticed that the shift rod passes through the swivel case. This screws up my plan of removing the upper and lower motor mounts and lifting the outboard off the swivel case/stern bracket assy.

    After removing the lower unit with the lower shift shaft, what do I do with the shift shaft that goes through the swivel case?

  5. #5
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    Default Re: Preparing for Swivel Case and Mount Frame replacement

    Well the 2007 new take-off parts didnt happen. The ebayer accepted my offer, took my payment and then sold it to someone else that made a higher offer... At least he refunded my payment.

    Back to plan "A"
    I bought a swivel mount and transom mount set off ebay from a fresh water motor (about 2004). Look brand new to me. Bought a new frame mount and lower center mount housing (for a 2004) and a few misc pieces and started assembly.

    I don't know why Honda designed it this way, but the lower center mount is a substantial press fit onto the splined frame mount. Fortunately I have a hydraulic press, but it took more than I would have guessed. If you are considering changing your frame mount, plan on a new center mount, even with proper tooling pressing an old one off would be unlikely.

    Still waiting on a back ordered tilting shaft, should ship tomorrow. Might tear it apart next weekend.
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    Last edited by Solamar; 10-19-2017 at 01:04 PM.

  6. #6
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    Default Re: Preparing for Swivel Case and Mount Frame replacement

    Here's a shot of the the frame mount that I'm replacing. Not very confidence inspiring...
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  7. #7
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    Default Re: Preparing for Swivel Case and Mount Frame replacement

    Finally I am getting around to this project... Had some time on Saturday and started tearing into it.

    The lower motor mounts came apart easily, found the largest Black Widow I've ever seen living behind the Starboard MM cover Wonder how long she's been living there.

    I'm not re-using the swivel case or Stern Brackets so I can avoid the nightmare if separating those components. Judging by the look of the pivot tube, they would have to be cut apart.

    I knew the upper Motor Mounts were going to be a problem, and they did not disappoint. The rubber mount has a stainless screw inserted from the inside that bolts thru the rusted Frame Mount. I hoped the bolts would slide out, nope, rusted solid. The rubber motor mounts are held into the lower case by a square aluminum cover with four bolts. The inner upper bolts I could just barely get a 1/4" drive 6 pt socket onto, fortunately they popped loose.

    Now, the entire assembly (swivel case, transom mount and upper motor mounts) should have slid easily away from the motor. Nope. The rubber mounts were seized into the case.

    After prying, wiggling and cursing for a bit I got out the angle grinder with a cut-off wheel and went at it.

    Fortunately the upper shift rod that I was concerned about (it goes down through the swivel case) pivots at the top allowing the swivel assembly to be removed without disassembling the upper shift rail.
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  8. #8
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    Default Re: Preparing for Swivel Case and Mount Frame replacement

    The first picture below shows the Starboard Motor Mount cut from the Frame Mount. It wiggled out after being cut loose.

    The second picture is the stuck Port Motor Mount. After drilling a few holes through the rubber and soaking in Kroil I finally got it to come out!

    I bought the Honda paint kit (primer, paint, clear coat) to dress things up a bit, Hopefully I'll have time to finish this up over the Christmas break.
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  9. #9
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    Default Re: Preparing for Swivel Case and Mount Frame replacement

    Hit a snafu. The correct Frame Mount for my year is no longer available so after much research I bought a 2004 Frame Mount as well as 2004 Transom Mounts and Swivel Case. Turns out in 2004 Honda redesigned the Power Tilt/Trim ram and my earlier ram does not fit...

    Boats.net shows three different Power Tilt/Trim rams for 2004, priced at $800, $900 and $1,000. Any guesses what the differences might be?

  10. #10
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    Nov 2009
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    temecula, ca., usa
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    Default Re: Preparing for Swivel Case and Mount Frame replacement

    Extension case lengths???
    Just a guess.

    Hopefully someone else here knows for sure.

  11. #11

    Default Re: Preparing for Swivel Case and Mount Frame replacement

    The alphabetical letters in your model no will tell you what length your motor is then order the yoke according to that length: S-15 Inch ,L-20 Inch, X-25 Inch, XX-30 Inch.

  12. #12
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    Default Re: Preparing for Swivel Case and Mount Frame replacement

    Quote Originally Posted by jgmo View Post
    Extension case lengths???
    Just a guess.

    Hopefully someone else here knows for sure.
    Not a bad guess The three shaft length models all mount the power tilt-trim in the same brackets (same collapsed length) but I suppose it makes sense that the long shaft models would require more tilt "throw" to get the prop out of the water.

  13. #13
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    Default Re: Preparing for Swivel Case and Mount Frame replacement

    Quote Originally Posted by Tegweni View Post
    The alphabetical letters in your model no will tell you what length your motor is then order the yoke according to that length: S-15 Inch ,L-20 Inch, X-25 Inch, XX-30 Inch.
    Mine is a LRTA. Unfortunately the Boats.net lookup does not specify which tilt/trim is a S, L or X. Would make sense for the S to be the cheapest and the X to be the most expensive. I'll give them a call after New Years and see if they have any additional info on the parts.

    Thanks for the input!

  14. #14
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    Default Re: Preparing for Swivel Case and Mount Frame replacement

    Yeah, very confusing. I looked at both 2004 40hp LRTA & LHTA AS well as 2004 50hp LRTA & XRTA. There are three options for the assembly on all four of those listings when I think there should only be one for each!

    When you finally get this sorted out Solamar, you will have some valuable info for anyone trying to do the same thing. WHEW!

  15. #15
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    Default Re: Preparing for Swivel Case and Mount Frame replacement

    Quote Originally Posted by jgmo View Post
    Yeah, very confusing. I looked at both 2004 40hp LRTA & LHTA AS well as 2004 50hp LRTA & XRTA. There are three options for the assembly on all four of those listings when I think there should only be one for each!

    When you finally get this sorted out Solamar, you will have some valuable info for anyone trying to do the same thing. WHEW!
    Not sure if the info I came up with will be very helpful, or just more confusing...

    I called Boats.net and inquired about the differences. They had no idea, but said the correct tilt-trim ram for a 2004 BF40 LRTA is p/n 56000-ZW4-H18. Not even one of the three options listed on their website!

    I'm cheep, found one on ebay that was advertised as a 56000-ZW4-H13 (the middle priced ram) and said it was taken off of a BF40. Negotiated a fair price and I'm back in business.

    You can see in the picture below (new ram installed, old ram on the table), the ram has been flipped. The motor and bypass valve are now on the opposite side of the transom. Also the entire profile is slimmer.

    With a little luck I'll hang her on the back of my Whaler tomorrow
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  16. #16
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    Hague, Virginia, USA
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    Default Re: Preparing for Swivel Case and Mount Frame replacement

    That's weird! Are you sure that the new one shouldn't be rotated 180 degrees? I'm no expert, but on the 50 hp I've worked on, and all the diagrams show the pump motor on the left side.
    CHawk 25 DLX

  17. #17
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    Default Re: Preparing for Swivel Case and Mount Frame replacement

    It is weird. The opening on the Left transom mount to access the manual over-ride is cast over solid. Their is a new, smaller access hole on the Right transom mount to reach the over-ride now.

    From what I understand this is a change that started in 2004.

  18. #18
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    temecula, ca., usa
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    Default Re: Preparing for Swivel Case and Mount Frame replacement

    Did you sandbags the old One? Shore is SHINY! Are you planning on rebuilding that one or do you just like things real clean?

  19. #19
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    Default Re: Preparing for Swivel Case and Mount Frame replacement

    Quote Originally Posted by jgmo View Post
    Did you sandbags the old One? Shore is SHINY! Are you planning on rebuilding that one or do you just like things real clean?
    I wasn't planning on replacing it, so it got primed, painted and clear coated. Sure is pretty aint it

  20. #20
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    Default Re: Preparing for Swivel Case and Mount Frame replacement

    Yes it is!
    Now, sell it and get some of that cash back!;))

  21. #21
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    Default Re: Preparing for Swivel Case and Mount Frame replacement

    Our lakes season opener snuck up on me, gave me the motivation to wrap this up...

    Turned out perfect!

    While I had everything apart I painted the lower half of the outboard, replaced the old SeaStar steering with a Teleflex No Feedback system and hopefully solved the issue of water in the gear case (corrosion around the shift plug o-ring).

    I also raised the engine mount position one hole up (was all the way down). The boat seems more agile now but if I'm trimmed a bit high and punch it the prop can cavitate. Think I like it in this position better though.

    Advice if you were to want to tackle this project -
    * I'm fairly sure the obsolete "Frame Mount" from the earlier BF40's is a direct swap for the newer frame mounts (I think I used a 2004). the only difference I noticed was the newer part had holes to accept some sort of bracket under the steering arm. So if your swivel mount, transom mount etc are still good, re-use them.

    * The shift linkage is a problem unless you remove the power head. I cut my upper motor mounts (they were seized) and if I didn't, I don't think I could have gotten around the shift linkage binding. To re-assemble I took out the upper shift boot, removed the pin holding the shift shaft at the top, and then cursed and fought with needle nose pliers to put it back together. Then split the shift boot to put it back on around the shaft. Removing the upper shift shaft from the top would prevent all these issues.

    Hopefully I've added another decade to this old rig!


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    Last edited by Solamar; 02-19-2018 at 06:06 PM.

  22. #22
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    Default Re: Preparing for Swivel Case and Mount Frame replacement

    Looks awesome Salomar!
    That was quite a saga to follow. You must have the heart of a lion to have tackled the job of getting it apart and assessed and then track down replacements and get it all back together and looking that GOOD!
    Congratulations sir!

  23. #23
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    Default Re: Preparing for Swivel Case and Mount Frame replacement

    Thanks JGMO,

    That rusted steering arm bothered me, and really it wasn't that bad of a job.

    Quite happy with it now!

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