RD rod bearings

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This topic contains 4 replies, has 3 voices, and was last updated by Avatar adam1961 1 month, 1 week ago.

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    stanley
    US Member - 1 Year
    Replies: 296
    Topics: 97
    #178769

    I’m helping a friend get a RD 14 running.Both cylinders have some rod knock,confirmed with screw driver in plug hole check.Is there a new bearing available or does he look for NOS bearings?Are the needles or the cage more often the problem?

    frankr
    frankr
    US Member - 1 Year
    Replies: 4323
    Topics: 43
    #178770

    Needles just don’t go bad without complete destruction. I’d rather suspect worn wrist pin bushings. Fairly common on 25hp motors

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    stanley
    US Member - 1 Year
    Replies: 296
    Topics: 97
    #178771

    Thanks Frank.If that turns out to be the case,does he need to find new rods or can the bushings be replaced?

    frankr
    frankr
    US Member - 1 Year
    Replies: 4323
    Topics: 43
    #178789

    According to the original design, you need to replace the rods. But of course, we know it is possible to make some new bushings from bearing material. They would have to be parallel with the big end bearings. Issue #2 is are the pins loose in the piston bosses?

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    adam1961
    Canada Member - 2 Years
    Replies: 366
    Topics: 80
    #178951

    Without the book in front of me, I think the early RD rods were 375767. There are quite a few out there. Unless you are able to make the bushings yourself, I would expect that it would be more cost effective to replace the rods.

    I can see if I have some good ones tucked away if you decide to go that route.

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