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coolant issue on 12 v 92s

Discussion in 'Engines' started by bluesuit, Feb 26, 2014.

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  1. rgsuspsa, Mar 1, 2014
    #21
    rgsuspsa

    rgsuspsa Member

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    bluesuit: Saw your question on another forum. As Ski answered, and he is
    very capable and marine experienced, four days with two men is probably appropriate, barring severe accessibility issues.
  2. bluesuit, Mar 1, 2014
    #22
    bluesuit

    bluesuit Member

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    Thanks Ron!
  3. Jimbo1959, Mar 1, 2014
    #23
    Jimbo1959

    Jimbo1959 Member

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    The rear of the engine does not need to come off. You can pull the cam through the front. I think it's faster depending on application and access to pull the heat ex-changer, surge tank, water pump, vibration damper to get the front gear cover off and the left bank forward head. You will have to remove the bolts that go through the pan into the gear cover. You will then pull the forward cam. NOTE THE GEAR TIMING FIRST!!!!!! As this engine turns in the opposite direction as the rear engine. Then pull the plate off the rear gear case cover. A good DDA Tech will have or be able to make the tool needed to push the cam out of the gear while holding the gear in place, so it will not fall out of time. I have done this procedure many times and I think its faster than removing the transmission (very heavy item)
    Thanks Jim.
    P.S. If you weren't so far away I would be glad to come down and help you.
  4. Jimbo1959, Mar 1, 2014
    #24
    Jimbo1959

    Jimbo1959 Member

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    Ron actually I've done it 3 times. Kent Moore made a tool that was for this very purpose. But it only makes sense if getting the transmission out of the way more difficult.
    Thanks Jim.
  5. rgsuspsa, Mar 1, 2014
    #25
    rgsuspsa

    rgsuspsa Member

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    Jimbo: Thanks for the tip. I had not considered this practical,
    but I am grateful for your input.
  6. bluesuit, Mar 1, 2014
    #26
    bluesuit

    bluesuit Member

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    Thank you all! Great advice!
  7. bluesuit, Mar 6, 2014
    #27
    bluesuit

    bluesuit Member

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    To All:
    Good news!!!! It was the injector tubes that were leaking. Two were leaking on one of the outboard heads. We still need to replace a camshaft and rear main seal, but besides that, no cracked head or cylinder liner.
  8. bluesuit, Mar 29, 2014
    #28
    bluesuit

    bluesuit Member

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    To all:
    My mechanic dropped the oil pan yesterday and he found two bent up thrust washers laying at the bottom of the pan. Any idea what might have caused that???? Suggestions on where to go from here? Haul block out of boat to machine shop, etc.
  9. Capt J, Mar 29, 2014
    #29
    Capt J

    Capt J Senior Member

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    Yeah, anytime you have water or non-compressable fluid in the cylinders, it is going to put all kinds of strain on the bottom end of the motor. I had a Donzi with the then new Vortec 350, which had too much advance on the camshaft or something when they first introduced it. Turns out it would injest water from the exhaust risers due to the camshaft advance. Well the motor ran liked a raped ape 2 trips, then all of a sudden it kept losing and picking up oil pressure. Take the motor apart and it spun a few crank bearings and by that time the problem was known in the industry. Longer risers helped greatly also turns out.

    I would do a major and mic. all of the crankshaft journals as well as the block where the sleeves go both at the top, middle, and bottom. I have seen them get egg shaped.
  10. Capt Ralph, Mar 29, 2014
    #30
    Capt Ralph

    Capt Ralph Senior Member

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    I'm guessing you went into the sump for a check out or check the rods to the wet cylinders.
    Large washers in the pan would come from cam gear ends or PTO hardware. Some washers are used holding the plumbing up on oil & scavenging pump pickups.
    If your having cam end hardware problems, previous owners / mechanics may had already been there. Until you find something real major with the block (it was running) or don't have the room for in-frame service, why pull?

    I remember dropping my two-piece pan on our 12v71s. Found all kinds of loose hardware. Mostly from years of dropping hardware during injector, rack, valve service down the oil return galley. Found an extra oil pressure relief valve also.
    No gold or jewels.
  11. bluesuit, Mar 30, 2014
    #31
    bluesuit

    bluesuit Member

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    Can all required machining work on block and crank shaft be done in frame.
    Since the transmission is removed there is adequate room to work.
    I really don't want to haul that block out if it only needs bottom end service!
  12. Capt Ralph, Mar 30, 2014
    #32
    Capt Ralph

    Capt Ralph Senior Member

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    If the crank is in good shape, usually, the block can stay in the boat. Pulling those long cam shafts may need some extra fore/aft room.
  13. Capt J, Mar 30, 2014
    #33
    Capt J

    Capt J Senior Member

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    You can pull the crankshaft out and leave the block. If the block is in good shape than it doesn't need to be taken out of the boat. If the motor wasn't seriously overheated, the block is generally fine. Some blocks came out of DD as problem childs with egg shaped bores as well, you just need to measure them to see where they're at.
  14. Capt Ralph, Mar 31, 2014
    #34
    Capt Ralph

    Capt Ralph Senior Member

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    I had a couple of bad holes where my liners fit poorly in the block (12v71s) and my shop cleaned them up (block holes) while in the boat. I'm sure but not positive that 92s use similar liner technology and can be replaced and serviced like my 71s; Any issues with the block / liner fit can be corrected in frame.
    Any thing is possible on a crank. Yes, raise the block and drop the crank. Need a bunch of kids with strong backs, not from the same hood, to lift it out of there.

    On the other hand, unlike 12v71s (one piece block and crank), is a 12v92 just 2 X 6v92 blocks? One or 2 piece crank? or was that just for the 16Vs?

    I may remember some (or learn) more DDC stuff here in a while.

    I would thing crank bore alignment an decking are really the only things that a good block has to come out for.

    In the end play, Sometimes IT JUST MAY be easier to rebuild in a shop. My old back would prefer it. Let somebodys else's back get abused putting that long block back into the boat.
  15. rgsuspsa, Mar 31, 2014
    #35
    rgsuspsa

    rgsuspsa Member

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    The block assembly of a 12V-92 engine consists of two, 6V-92 blocks joined together, and the crank is a two-piece assembly.
  16. Capt Ralph, Mar 31, 2014
    #36
    Capt Ralph

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    Well then, the world is full of possibility's. Anything can come out, stay in, come out & in.
    Pushing my thoughts; I'm assuming two piece cams?

    I did read an article about a Penski project; 24v71s. Still day dream about that.
  17. Capt J, Apr 1, 2014
    #37
    Capt J

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    A friend of mine ran a motoryacht with a pair of 24v92's. It was a FUEL HOG and always problematic......
  18. Jimbo1959, Apr 1, 2014
    #38
    Jimbo1959

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    No, 4 cams, 2 complete gear trans. Right and left hand rotation. The 92 series is a wet liner engine unlike the 71's. The OP mentioned large washers in the pan, were they thrust washers?
    Thanks Jim
  19. Jimbo1959, Apr 1, 2014
    #39
    Jimbo1959

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  20. bluesuit, Apr 2, 2014
    #40
    bluesuit

    bluesuit Member

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    Jumbo,
    Yes to thrust washers
    Two of the chewed up laying in the bottom of the pan
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