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Rod Bearing Replacement

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  • #16
    One way to tell if the bearings are responsible for your oil pressure problem is to accelerate briefly then let up on the throttle. Watch the oil pressure gauge. When you first step on it the pressure will drop briefly. When you let up on it the pressure will surge briefly.
    Back in the days when people were driving Studebakers just because they were such cheap transportation, people used to routinely abuse the engines (low on oil, never change oil, etc.). They were amazingly durable and could stand abuse for many thousands of miles. Many V-8s were scrapped simply because they were smoking due to bad valve guide seals. Years ago I swapped a R-1 (when you couldn't buy high enough octane gas for them) to JP who installed a '64 289 engine in my '64 Champ as part of the deal. The donor '64 Cruiser had 90,000 miles on it and had clearly been abused. I decided it would need an overhaul typical of the times (hone the cylinders, put in .001 rings and .001 bearings). I had a set of .001 bearings that I put in. I decided to plastigage them just to see how much worn the crank had been. Imagine my surprise when the plastigage was squashed out so far that I couldn't even read it (yes, I supported the crank to avoid the false reading that gravity can give you). I put in a set of standard bearing and plastigaged them too. They measured to the extreme tight end of factory specs. So, a 289 crank in an abused car essentially didn't show ANY wear in 90,000 miles. I'm convinced.

    [img=right][/img=right][img=right][/img=right][img=right][/img=right][img=right][/img=right]Paul Johnson
    '53 Commander Starliner (since 1966)
    '64 Daytona Wagonaire (original owner)
    '64 Daytona Convertible (2006)
    Museum R-4 engine
    Paul Johnson, Wild and Wonderful West Virginia.
    '64 Daytona Wagonaire, '64 Avanti R-1, Museum R-4 engine, '72 Gravely Model 430 with Onan engine


    • #17
      I went into a Rambler 196 a few years back. It had a knock when warm and it turned out that one rod bearing was the wrong size! All were standard save for this one that was .010 under. The gal that owned the car was driving it anyway (with the persistent knock[V]) as tho nothing was wrong! Drove it like this for weeks![:0]
      All it took was a new set of proper-sized bearings to quiet it down and the car now still motors on while the gal succumbed to cancer
      I don't know how much having a forged crank had to do with it, but in spite of the gross clearance it had run with, the journal looked and measured like new![^]

      Miscreant adrift in
      the BerStuda Triangle

      1957 Transtar 1/2ton
      1960 Larkvertible V8
      1958 Provincial wagon
      1953 Commander coupe

      No deceptive flags to prove I'm patriotic - no biblical BS to impress - just ME and Studebakers - as it should be.


      • #18
        A .010 under bearing would just lock up a stock crank. Maybe the crank was turned .020 ?

        Arnold Md.
        Studebaker On The Net
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