Question on undersized rods
Took. My engine to the machine shop after work told what I wanted done and will have to wait a week till the get back to me with measurements , anyways I was told if it needed a .20 under rod it would need a bearing installed. I thought a .20 under rod didn't have bearing?
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You can get a .020 under rod through Kustom Lawn and Garden. BTDT:beerchug: Extremely fast shipping. Ordered one day received rod 2 days later.
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I'm going to start doing bearing inserts on all my rods. That way, they are re-usable. You can go with a .020" under if you want. My machine shop will machine the rod and install the bearing for the same price or just a little less, than a new rod. Your choice.
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I don't know what size I need as of yet. I just thought a .20 under rod was made like a standard size just larger to accommodate the turning of the crank from machining . From way it looked could be within spec, both rod and crank look fine. Oh he also advised against reusing the old rod even if good on specs . He sad he would worry about fatigue of the rod.
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I've not seen very many cranks that were "withing spec" enough that they didn't need turned. Expect at least a .010" under. |
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Please excuse the machinist ( :biggrin2: ) as he nitpicks your post. When the crankshaft rod journal is turned .020 undersized, it will require a connecting rod with a smaller hole size to have the correct clearance. ~~~~~~~~~~~ He is correct on the rod, aluminum fatigues with use and it will fail at some point. |
That's what I was thinking too .10" under. The place was busy several 6 cylinder blocks a 3 cylinder jd block , quite a few diesel heads. It is a new building, their old one burned last fall they lost all their machines several engines. Thanks Jonathan for confirming what I thought about the rod . That's ok Jeff no problem with nit pickin !
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Do you run any of your motors with bearing inserts? What about boring a new rod? I may still try it on some of my own (just because). I've got a few good looking Kohler rods that I wouldn't re-install just because they are used, but they aren't "spun". |
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