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  1. #1
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    Merc V-200 87´ deceased or not?

    Hi all
    I need some help to dertermine what is wrong inside my motor.
    The story goes like this:

    During my last ride the engine started making noise (like a blown bearing or something) and stopped. I wasn´t able to start the engine again. After being towed to shore I tried to locate what went wrong.

    The engine won´t start now and the starter-motor can turn the engine 2 revolution before getting stuck. The Battery is ok and has turned the starter-motor fine until now. Keep pushing the ignition (starter-motor) will bring the crank past this "dead" point but on if I keep forcing the starter-motor on several times. When the crank gets past this "dead" spot the starter-motor will turn the crank 2 revolutions again before getting stuck again.
    I hope this make some kind of sense, if not, please ask and I´ll try to supply you with further details.

    What I want to know is:
    Is this engine dead or not?
    What causes the engine to get stuck after 2 revolutions?

    Kind regards
    Christian, Denmark


  2. #2
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    You have more than likely stuck a piston. Pull the heads and quit trying to start it. You can only hurt it worse by turning it over.

    Rock
    Team Junk

    No sparkling wiggles in here, only dump truck grinches.

    "Screamin Heathen"

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  4. #3
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    Heads of

    Quote Originally Posted by rock View Post
    You have more than likely stuck a piston. Pull the heads and quit trying to start it. You can only hurt it worse by turning it over.

    Rock
    Thanks for the advice

    I´ll stop trying and then remove the heads for inspection of the bores.
    After that I´ll post some pictures to get confirmation of the bores status and path forward.

    Bimmer1

  5. #4
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    Good luck.
    Team Junk

    No sparkling wiggles in here, only dump truck grinches.

    "Screamin Heathen"

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  7. #5
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    Quote Originally Posted by rock View Post
    Good luck.
    Click image for larger version. 

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    I´ve located the problem to left bank lower cylinder. The conrod bearing is trashed (pic 4) and small pieces of metal has unfortunately damaged both the piston and the cylinder wall. I am now in the process of disassembling the motor totally and it is going well so far. However, I can´t remove metalring between the flywheel and the crankshaft (pic 5+6). I need to remove that ring in order to remove the black part under that ring. First then can I remove the block and get to pistons, rods etc.
    Hoping you can give me a bit of advice both in relation to removing the ring (pic 5+6) and maybe an idea of whether the block can be rebuild or needs a replacement. I asume that the conrod bearing, conrod (maybe) and piston can be replaced.

  8. #6
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    Flywheel puller is needed to remove the hub... no need to remove the 8 bolts to remove the wheel, comes off with the hub!

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  10. #7
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    If that bearing is as bad as it looks you are going to need a piston, bearing, rod and crankshaft at a minimum and yes the block can be fixed. If you have a lifting ring you can drill the center and tap it then run a bolt down onto the end of the crank to separate flywheel hub. As stated above you could have left the flywheel in one piece. Good luck.

    Rock
    Last edited by rock; 10-04-2017 at 10:39 PM.
    Team Junk

    No sparkling wiggles in here, only dump truck grinches.

    "Screamin Heathen"

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  12. #8
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    Quote Originally Posted by rock View Post
    If that bearing is as bad as it looks you are going to need a piston, bearing, rod and crankshaft at a minimum and yes the block can be fixed. If you have a lifting ring you can drill the center and tap it then run a bolt down onto the end of the crank to separate flywheel hub. As stated above you could have left the flywheel in one piece. Good luck.

    Rock
    Thanks a lot for your help and prompt respons.
    It´s a great help having the option to ask an expert for advice in this way.
    I´ll get back when block is of and the internals are inspected.
    Regards

  13. #9
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    Quote Originally Posted by bimmer1 View Post
    Thanks a lot for your help and prompt respons.
    It´s a great help having the option to ask an expert for advice in this way.
    I´ll get back when block is of and the internals are inspected.
    Regards
    I´m having a hard time seperating the Block from the Mid section and would like to ask if there is any tips end trix for this operation.
    I´ve removed the 10 Nuts that holds the Block together with the Mid section but the Block is pretty much stuck.
    I´m thinking of putting back the Flywheel and the try to get one of those lifting eyes that fits on top/inside the Flywheel. Is that the way or is there another way to loosen the Block from the Mid section?

    Regards

  14. #10
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    The long studs get stuck. I use a very flat wedge starting at .005 and going to 1/8 inch.heat the stud area and bang the wedges. A part of leaf spring if ya can't get wedge....

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  16. #11
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    Also .Get the lower unit off 1st

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  18. #12
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    Quote Originally Posted by roadkill636 View Post
    Also .Get the lower unit off 1st
    The lower unit is of. I´ll try with a wedge between the Block and the Mid section I guess?

  19. #13
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    Now the motor is pretty much disassembled and I have inspected the Block, Rod, crank, Piston etc.
    The piston has small scratches on the sides and some significant nicks on top. The Crank and rod has some damage but I can´t tell if it is possible to repair (if necessary) or not.
    The Rod bearing is totally gone. The block has a significant scratch and I hope that the block can somehow be repaired.

    Questions:

    Which parts needs to be repaired and is it realistic to re-fit some of the old parts?
    I know for sure that I need a piston and rings but what about the conrod?
    For sure I need a new bearing (the old one isn´t there anymore.
    Can the crank be repaired?

    I´m planing to replace all piston rings since I have all pistons out of the motor now, good idea?
    Is there anything else that you guys would consider replacing now that I have the motor disassebled at this level?

    Pictures of the involved parts attached below.

    I hope you guys will take a look at the pictures and let me know what you think. Thanks

    Click image for larger version. 

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  20. #14
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    You need a crank, rod, piston and a sleeve...plus the required rebuild parts.

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  22. #15
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    Crank, piston, rod makes sense but I´m not sure how to get the block re sleeved. Are you refering to the chrome bore and can the chrome bore/sleeve be replaced?

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