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Replacing Or Rebuilding My Mercruiser Bravo 3 Trim Cylinders - Start To Finnish

Discussion in 'Boat Mechanics, Technical Help, etc' started by Nautical Gator, Jul 12, 2017.


Page 2 of 3
  1. lobsterman

    lobsterman Seaman Recruit

    You can get pipe plugs in plumbing ace or Home Depot or lows.
    The seals are made with stainless steel metal instead of plan steel and will not rust. I rebuilt my 175 OEM out drive years ago. I purchased all the seals and bearings from motion industry instead of buying a kit. Much cheaper. You have to know how to determine the part numbers by measureing if you can't read it on the old part. With the internet you can learn how to measure seals and bearings and o-rings. You need a good dial or digital veneer calipers. Micrometer, depth and inside Mike even better, but getting deeper into measuring equipment. You can do most everything close enough with a caliper. You can measure outside, inside and depth. Look up how much they are, then go to a pawn shop. They almost always have them. I would suggest a digital. They are easer to read and switch between metric and standard. With this tool you can determine information needed to determine part numbers and don't need to buy expensive kits. You can buy everything on line or call motion. Nice thing about them is if you can't figure a part number they will help using your demension. I do this all the time at work for rebuilding units we have no idea where they came from 30 years ago. Draw back is you have to disassemble, measure, buy parts. The plus is you buy what you need for less than $50 bucks compared to $250 bucks.
    For any DIY out there I suggest you look into getting yourself a digital veneer calipers. Determining the size of something can save you a lot if money, time and heartache.
    https://m.mscdirect.com/mobileweb/category?catId=12108095&searchTerm=Calipers+
     
    lobsterman, Jul 13, 2017
    #21
  2. Nautical Gator

    Nautical Gator Forum Captain, Moderator, Peacekeeper Staff Member
    Thread Started By

    Nautical Gator, Jul 13, 2017
    #22
  3. lobsterman

    lobsterman Seaman Recruit

    Okay, the seal is rubber of course. The spring and metal are stainless steel. I was referring to the ones on your cylinder rods.
    Looks like the kit has spring retainers also. Should be able to size them also and get from motion industry. Although $18 bucks I think I would just go with the kit.
     
    lobsterman, Jul 13, 2017
    #23
  4. Nautical Gator

    Nautical Gator Forum Captain, Moderator, Peacekeeper Staff Member
    Thread Started By

    Remove the trim cylinder tube and now need to remove the end caps and it is on tight.

    The inside piston shaft turns, but it is stiff, needed to use a PVC pipe to twist in round.

    I was able to remove the inside ring, now soaking with PB Blaster, hoping that it loosens it up some?

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    ATTACH=full]38623[/ATTACH]

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    Nautical Gator, Jul 17, 2017
    #24
    lobsterman likes this.
  5. Nautical Gator

    Nautical Gator Forum Captain, Moderator, Peacekeeper Staff Member
    Thread Started By

    Nautical Gator, Jul 17, 2017
    #25
  6. Nautical Gator

    Nautical Gator Forum Captain, Moderator, Peacekeeper Staff Member
    Thread Started By

    Cleaned it up some, now need to try to disassemble and get the end cap unfrozen and get if off of the shaft.

    P7180650.JPG
     
    Nautical Gator, Jul 17, 2017
    #26
  7. Goggle Eye

    Goggle Eye Seaman Recruit

    Nice...once you slide the other end off it's a matter of changing the O-rings out....Take your time.
     
    Goggle Eye, Jul 17, 2017
    #27
  8. Nautical Gator

    Nautical Gator Forum Captain, Moderator, Peacekeeper Staff Member
    Thread Started By

    OK I needed to get the end cap unfrozen and get if off of the shaft.

    So I had to put it back on the lower units out-drive, then put a PVC pipe in through the busing housing so that I could get some leverage when twisting and pulling it off while twisting at the same time. it Backed out pretty easily like that.

    P7180652.JPG


    I then needed to get the lower piston out, so I used my air compressor and blew some air through the hose opening on the cylinder hole, while pointing it down into a bucket so it would not shoot out across the yard like a cannon LOL It came right out with the compressed air.

    upload_2017-7-17_18-10-58.png

    NOTE: (I'm glad I pointed it into the bucket) or it would have traveled far.


    P7180653.JPG
     
    Nautical Gator, Jul 17, 2017
    #28
    Fisher3, mkyota1, lobsterman and 1 other person like this.
  9. lobsterman

    lobsterman Seaman Recruit

    Looks like it is coming along fine.
     
    lobsterman, Jul 17, 2017
    #29
  10. Nautical Gator

    Nautical Gator Forum Captain, Moderator, Peacekeeper Staff Member
    Thread Started By

    Not out of the water yet!

    Although I removed the Mercruiser Bravo 3 Trim Cylinder Rams 98704a26 And 98703a26 end caps and internal parts, it seems that there was some corrosion and pitting on the inside where the top outer seal sits, so instead of risking it leaking,


    upload_2017-7-18_9-43-8.png



    I ordered the below Sierra International 18-2373 Trim Cylinder End Cap.

    I will use the new gasket kit on the port side of the Mercruiser Bravo 3 Trim Cylinder Rams, since I am using a new Sierra International 18-2373 Trim Cylinder End Cap on the starboard side.

    and as a plus, it comes with all the internal and external o-rings and seals.


    Sierra International 18-2373 Trim Cylinder End Cap
    https://www.amazon.com/gp/product/B000N9LOBW/?tag=shrimpflforum-20
    upload_2017-7-18_9-42-9.png

    Model # 10533040 | Mfg # 18-2373 | UPC # 808282243548
    • The Sierra 18-2373 Trim Cylinder End Cap is interchangeable with the following: Mercruiser 806191T, 8M0110717, 14698T10, 14698, 14698T. Each Sierra product meets or exceeds the original equipment part it replaces.
    • Sierra Trim Cylinder End Cap
    • Cap Diameter: 1.890
    • Sierra part number: 18-2373
    • Interchangeable with the following: Mercruiser 806191T, 8M0110717, 14698T10, 14698, 14698T
     
    Nautical Gator, Jul 18, 2017
    #30
    Goggle Eye likes this.
  11. Goggle Eye

    Goggle Eye Seaman Recruit

    Good decision Gator. You don't want to go through all this and have it leak/fail.
     
    Goggle Eye, Jul 18, 2017
    #31
    Nautical Gator likes this.
  12. Nautical Gator

    Nautical Gator Forum Captain, Moderator, Peacekeeper Staff Member
    Thread Started By

    Nope, if you are going to do something, you might as well do it right the first time! :)
     
    Nautical Gator, Jul 18, 2017
    #32
    Fisher3 and Goggle Eye like this.
  13. Goggle Eye

    Goggle Eye Seaman Recruit

    I don't have an I/O ...whats the best position to store the drive while at the house?
     
    Goggle Eye, Jul 18, 2017
    #33
  14. Nautical Gator

    Nautical Gator Forum Captain, Moderator, Peacekeeper Staff Member
    Thread Started By

    OK I received the Sierra International 18-2373 Trim Cylinder End Cap
    https://www.amazon.com/gp/product/B000N9LOBW/?tag=shrimpflforum-20

    I was please to see the quality of the Sierra International 18-2373 Trim Cylinder End Cap which looks to now be made of Bronze, instead of the Aluminum like the OEM was.
    Wiped off the shaft and parts, lubed with gear lube, and installed the Sierra International 18-2373 Trim Cylinder End Cap which came with the seals installed on it, but I still needed to replace the seals on the lower cap and spring unit.

    New Left Old Right

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    New Left Old Right
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    Sierra International 18-2373 Trim Cylinder End Cap


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    A look inside the old end cap

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    A look inside the new Sierra International 18-2373 Trim Cylinder End Cap
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    A look inside the old end cap
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    Sierra International 18-2373 Trim Cylinder End Cap
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    Sierra International 18-2373 Trim Cylinder End Cap
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    Sierra International 18-2373 Trim Cylinder End Cap
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    Starting to assemble the new Sierra International 18-2373 Trim Cylinder End Cap on to the piston shaft

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    Replaced the O-Rings on the bottom parts
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    Got the spring assembly installed
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    Got the spring assembly installed
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    A look inside the hydraulic Cylinder trim tub

    P7200678.JPG
     
    Nautical Gator, Jul 19, 2017
    #34
    Goggle Eye and mkyota1 like this.
  15. Nautical Gator

    Nautical Gator Forum Captain, Moderator, Peacekeeper Staff Member
    Thread Started By

    OK I finished the Rebuilding of my Starboard side MerCruiser Bravo 3 Trim Cylinder Rams 98704A26 and 98703A26 a

    Started raining, so I will have to wait until a better time to install it back on to the outdrives lower unit and fill with gear lube and bleed the lower unit system then make sure all is working properly.
    I still need to rebuild the post side of my outdrives lower unit.

    P7200680.JPG
     
    Nautical Gator, Jul 19, 2017
    #35
  16. Nautical Gator

    Nautical Gator Forum Captain, Moderator, Peacekeeper Staff Member
    Thread Started By

    OK Rebuilding my MerCruiser Bravo 3 Trim Cylinder Rams 98704A26 and 98703A26
    Both the Port and Starboard sides, from start to finish.

    PART 2 POST SIDE

    After taking off the Port side and looking inside the Trim Cylinder End Cap, I see some of the same corrosion as there was on the Starboard side, so I am going to play it safe and order another new Sierra International 18-2373 Trim Cylinder End Cap
    https://www.amazon.com/gp/product/B000N9LOBW/?tag=shrimpflforum-20

    Should be here on Friday.

    P7200682.JPG

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    Sierra International 18-2373 Trim Cylinder End Cap
    https://www.amazon.com/gp/product/B000N9LOBW/?tag=shrimpflforum-20
    upload_2017-7-18_9-42-9-png.38663.png

    Model # 10533040 | Mfg # 18-2373 | UPC # 808282243548
     
    Nautical Gator, Jul 19, 2017
    #36
  17. Goggle Eye

    Goggle Eye Seaman Recruit

    New one looks great compared to the old...gotta love Amazon Prime for the speedy delivery. Thumbsup1:::1
     
    Goggle Eye, Jul 19, 2017
    #37
  18. Nautical Gator

    Nautical Gator Forum Captain, Moderator, Peacekeeper Staff Member
    Thread Started By

    Finished and installed the Starboard side of the MerCruiser Bravo 3 Trim Cylinder.

    Now waiting on the part to rebuild the Port side.

    P7200685.JPG
     
    Nautical Gator, Jul 20, 2017
    #38
    Fisher3 likes this.
  19. Nautical Gator

    Nautical Gator Forum Captain, Moderator, Peacekeeper Staff Member
    Thread Started By

    PART 2 POST SIDE

    OK Rebuilding my MerCruiser Bravo 3 Trim Cylinder Rams 98704A26 and 98703A26

    I received my parts for the port side and completed my rebuild.

    Installed it on my offshore out-drives lower unit, now just need to fill and top off my Reservoir with gear lube and test.

    P7230695.JPG
     
    Nautical Gator, Jul 26, 2017
    #39
  20. Nautical Gator

    Nautical Gator Forum Captain, Moderator, Peacekeeper Staff Member
    Thread Started By

    Nautical Gator, Jul 27, 2017
    #40
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