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Stbd 6-92 Bit The Big One

Discussion in 'Post Yacht' started by hughdunlop, Oct 1, 2016.

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  1. hughdunlop

    hughdunlop Member

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    Ho Hum , stuck ring broke and took split the liner in half. Not sure the best route to take , wontering if there is anyone who has removed a 692 from a 46 . I can only Imaging what I would be in for. Other option is to change out the one liner and piston , hoping that its easy to get the pan off and have room for torquing the rod. The other cylinders show hone marks so I am thinking it was not all that long ago she had work done. No engine history , the vessel was from an estate. Any info appreaciated....
  2. RT46

    RT46 Senior Member

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    I would do all six kits.

    I have the same boat with 671's and there is room to take the pan off and inframe the mains.
  3. P46-Curaçao

    P46-Curaçao Senior Member

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    +1
  4. Capt Ralph

    Capt Ralph Senior Member

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    Unlike the straight 671s, the 6V92 is a fat beast.

    You mentioned stb engine but which bank?
    If the inside bank, tearing the exhaust and head down will offer (hopefully) good room for the pan.

    * Then you can see the condition of 2 other pistons.
    Pulling just the bad liner and examining the O rings will help determine the condition of the other liner seals.
    If the O rings and other liners & pistons look good, then replace that one lung and get back to fishing.

    If it's the outside bank, think about room for pulling the exhaust manifold, head and clearance to pull the liners up.
    A deck frame or support may be in the way.
    Then You may have to pull the whole motor up, and in, even just a few feet. Then consider the above thought * again.



    Get in, Get out, Don't mess about, Yo Ho
  5. Capt J

    Capt J Senior Member

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    I would do the entire engine. There's a good reason the liner split and it's more than just a stuck ring. Either someone used the wrong liners and they were too loose in the bore or cheap Chinese rebuild parts. I would think you could overhaul it in place.
  6. jerryd

    jerryd Member

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    Yes you can do kits and liners in your 46 post I did. You can drop pan and torque rods. A big mirror helps. I did not remove exhaust manifolds. very difficult to remove connecting studs. IMO would change all kits and liners. Just my opinion.
  7. Davidoc

    Davidoc Senior Member

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    I have 6v92 JT's in 46225. I have done both engines, with all Detroit parts, in the boat. There is room underneath to drop the pan but you can only move it around to get to the rod bearing caps.
    Two men can lift the heads out but putting them back on the outside block requires a cum-a-long to hold it in place in order to ensure that the water jacket gaskets are installed properly. I actually used my salon floor bar, raised up with a couple of 4 x 4's to lower the heads in place. There are also head alignment pins to make sure she goes on perfect.

    Dropping the pan and cleaning the old gasket off is the worst part of the job in my opinion. I would do all six if you have to do one. I hate dropping the pan.

    Keep the engine in the boat. My starboard engine was pulled to have it rebuilt and dyno'ed by Detroit, but the amount of woodwork and wiring damage was not worth it in my opinion. That was before I owned her and the cost was substantially more than working in the boat. All my work was done in the water at my house. Time and money with a good Detroit mechanic as a friend is all you need. A bottle of rum is helpful.
  8. Capt Ralph

    Capt Ralph Senior Member

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    You mean there is another rummy wrench swinger? Must of been a cousin of mine.:D
  9. Davidoc

    Davidoc Senior Member

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    Hey Ralph, I put that in to see if you would bite!! Ha Ha
    Dave
  10. hughdunlop

    hughdunlop Member

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    Thanks my friends , I have the exhaust and head off , inboard bank , The hone marks are still visible in the two other cylinders , That barrel was an issue since the start of my adventure , the only reason I knew something had gone wronge was she started dumping white smoke as soon as the liner split , changing injector did not change things , was hopeful of a valve issue , inspection plate removal revieled all ....My plan I think at this point will be to remove starter and alt to get more room to get the pan off , have my DD guy redo the head , measure for the new liner , ( best of gear ) and go from there......I will also be looking to account for all the pièces of ring and liner in the airbox. I am away at sea now so this will all be a winter project. I try to be positive , I sure will know very much about these beasts as well as have the bad barrel issue dealt with.

    My other thought would be to build a gantry of sorts Inside the boat and remove the engine and rebuild all barrels and mains etc without taking it out of the boat. Any ideas on this ^
  11. Capt J

    Capt J Senior Member

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    I don't think you need to take the engine off of the mounts. I'd rebuild it in place if I could. Perhaps a little more difficult to get to the rods and mains but I'd do a major if I'm taking it apart that far.
  12. Davidoc

    Davidoc Senior Member

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    I agree with Cap J. Keep us posted on your experience.
  13. hughdunlop

    hughdunlop Member

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    I will keep you guys posted 4 sure , I am wanting to be sure I can get under the engine for the large torquing etc for rods and mains.....I would sure like to have a complete history of that engine.
  14. RT46

    RT46 Senior Member

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    I hate to use the term "might as well" and "as long as your are in there"

    but as long as you have one head off, and while your in there,
    you might as well take the other head off and do all six kits.

    The cost difference in parts and labor for one kit vs six kits seems to make sense to do all 6.

    Unless, maybe you were running a commercial operation and needed to get up and running asap.
  15. hughdunlop

    hughdunlop Member

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    I am not sure which way I am leaning , I will really have to get Under there to see what I am up against. I will do much of the work myself , with the direction and planned ocasional help through critical steps from my DD guy , I will save some of cost in labour and become a sort of DD guy myself. Something I feel necessary as I hope to be able to opperate this boat in my semi-retirement mode ( Ditching lager than necessary ocean front home ) and lots of time for my own maintenance . The big thing is to get into the habbit of not stressing !
  16. 2lrep

    2lrep New Member

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    We did a complete overhaul last spring by removing the salon window, lifting the motor and turning it 90 degrees and blocking it, this allowed for the motor to sit up high and getting in and around was much easier, we left the trans in place. Good Luck!
  17. hughdunlop

    hughdunlop Member

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    Hmmmm , well I am not quite getting the picture of this in my head , do you have pictures ?
  18. hughdunlop

    hughdunlop Member

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    OK , I think I understand , I would love to see a picture of the lifting rig you geared up in the salon , I do not want to take the engine out of the boat but would like to have access to the mains
  19. 2lrep

    2lrep New Member

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    I do have some pictures but they were too large to send, send me an e mail to [email deleted, use PM] and I'll shoot those over to you. Regarding the rigging, we had the yard crane poke their boom through the window to allow us to turn it.
    Last edited by a moderator: Nov 9, 2016
  20. hughdunlop

    hughdunlop Member

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    tenacityjack@googlemail.com Thank you sir