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  1. #1
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    Top guided rods / bottom guided pistons

    I bought a rebuild kit for my Merc 2.4l - 200 86. The boss on the new pistons is wider than on the old pistons. So the rod and rollers can move around.

    Did some research and it appears my old pistons are made for bottom guided rods. Looks like I have top guided rods.

    So can I convert to top guided just by adding washers so there is no slop or do I need new pistons (or rods).

  2. #2
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    This might be what your looking for. This is from my 2.5 but I think its the exact same. Then again, maybe not.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    If I don't ask any questions, I'll never learn anything.

  3. Thanks Steve200 thanked for this post
  4. #3
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    Who's kit is it?

  5. #4
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    whats tha number on tha rods?...number on tha pistons?

  6. #5
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    Merc never made a top guided 2.4. The piston should be loose on the rod.

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  8. #6
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    yep im rebuilding one right now.

  9. #7
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    Just make sure it has the right washers on the sides of the rod on wrist pin side. Bottom guided washers should be stepped like Krazy's. Would still be good idea to post number on rod to make sure it ain't been no swappin going on.

  10. #8
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    Quote Originally Posted by Capt.Insane-o View Post
    Merc never made a top guided 2.4. The piston should be loose on the rod.
    What about the 1-2 weird year 2.4’s that were sleeved 2.5’s in essence were anybof those top guided?

  11. #9
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    bottom guided.. everything till '93 was bottom guided.. even tha 260......

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  13. #10
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    Hey Guys thanks for the replies. It's a TSM rebuild kit, they said they had to modify it to suit the chrome bore 200 I have. It's the only kit I could find that suited it.

    The motor is next door (15 minutes away) on my neighbours bench. I'll get back up there over the weekend to find out more. Just has some minor surgery so am on my arse for a couple of days.

    It's an old motor and has been rebuild before so who knows what is in it.

  14. #11
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    Many years ago I used to make thicker top guided washers for this type of application. Heat treated, hardened and ground. They worked great.
    Not sure if I still have any but I'll check. Won't be able to look until after the 1st.

  15. #12
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    one mo time... whats tha number on tha rods???..... whats tha numbers on tha pistons???

  16. #13
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    don't think he has the powerhead tore down yet?

  17. #14
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    Quote Originally Posted by Onetime View Post
    Many years ago I used to make thicker top guided washers for this type of application. Heat treated, hardened and ground. They worked great.
    Not sure if I still have any but I'll check. Won't be able to look until after the 1st.
    After thinking about this more I'm changing my story. I made thicker spacers when the small top guided rods came out so I could still use pistons for big top guided rods with the small top guided rods.
    Sorry, it was a long time ago!

  18. #15
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    Quote Originally Posted by racervboat View Post
    don't think he has the powerhead tore down yet?
    Yeah as mentioned its up at my nieghbours house a 15 min drive away along the ridge. I'll get those part numbers this weekend.

    thx, cheers.

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