shopin Posted January 6 Report Share Posted January 6 Anyone know the main-and-rod bearing journal sizes for a 230 CI Mopar flathead engine? Quote Link to comment Share on other sites More sharing options...
lostviking Posted January 6 Report Share Posted January 6 You do have a manual right? Simple google search finds that also. Quote Link to comment Share on other sites More sharing options...
DJ194950 Posted January 6 Report Share Posted January 6 Same as the 217/218 sizes-? Per the book. Mine is at a friends at the moment. Quote Link to comment Share on other sites More sharing options...
Dave72dt Posted January 7 Report Share Posted January 7 You'll also want to check the back side of the bearing shells. Often the shells are stamped with an undersize if the crank has been ground. You'll want to check them all because even though standard practice now is to grind all journals to the same undersize, that was not always the practice. Quote Link to comment Share on other sites More sharing options...
Matt Wilson Posted January 7 Report Share Posted January 7 These dimensions are for standard size crankshaft journals (never been machined). Mains: 2.4995 - 2.5005" (so 2-1/2" nominal dia.) Rods: 2.0615 - 2.0625" (so 2-1/16" nominal dia.) As others have mentioned, it is strongly recommended to get a rebuild manual, if you don't already have one. Quote Link to comment Share on other sites More sharing options...
Solution shopin Posted January 10 Author Solution Report Share Posted January 10 Thank to everyone that offered their opinion. I am very appreciative. I determined the following crankshaft journal values: main = 2.499" ; rod = 2.061. This was an industrial motor from a tug so I don't have a history. The crankshaft and all other parts of the reciprocating assembly look good. I suspect rings, bearing and gaskets will be all that is needed for the rebuild? Quote Link to comment Share on other sites More sharing options...
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