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  1. #1
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    OMC Drive Shaft Evenrude Johnson.

    Does anyone know what material the upper drive shaft is made of?

  2. #2
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    OMC Upper Driveshaft

    Quote Originally Posted by rude tim View Post
    Does anyone know what material the upper drive shaft is made of?
    Contact SeaWay Marine. They probably have one in stock too?

  3. #3
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    I certainly don't know the alloy content, but I've had Chris and Stan Carson make me a couple of drive shat stubs for my CCC restorations. He told me they are HARD!!! - went through several tool bits.

  4. #4
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    I thought the upper was made of some grade of mild steel and the bottom from stainless, friction welded together

  5. #5
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    OMC shafts never rust, thats was a Merc feature for many years
    Older one piece were friction welded, top some form of stainless and bottom very hard steel

  6. #6
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    The tops were SS and the bottoms were 8620, case hardened to a depth of .030 after grind. At one time the 2 were plug welded together, but had a reputation on breaking. They went to a shrink-interference fit with Locktite. I don't recall the friction welding.

  7. #7
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    Quote Originally Posted by Rotary John View Post
    The tops were SS and the bottoms were 8620, case hardened to a depth of .030 after grind. At one time the 2 were plug welded together, but had a reputation on breaking. They went to a shrink-interference fit with Locktite. I don't recall the friction welding.
    Hi John
    what type of Stainless?

  8. #8
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    That I don't remember, but suspect it was 304.

  9. #9
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    Interesting note. The first use of friction welding at OMC was the spline shaft on the end of the rotary snowmobile engine crankshaft.

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