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pretty wild Idea

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  • Bruce W.
    Very Frequent User
    • June 30, 1997
    • 358
    #1

    pretty wild Idea

    Hey Guys, want to run something by the experts. am having trouble finding the oil leak on my 65. looks like it is coming from the rear main seal. have replaced it twice plus the oil pan gaskets. So i am talking to an "expert" and he tells me that because I am running 456 gears that the higher RPM is causing pressure in the oil pan forcing out the oil. Sounds a little wild to me? Has anyone ever experienced anything like this?
    BW
    Tags: None
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    • William B.
      Very Frequent User
      • April 30, 1975
      • 939
      #2
      Re: pretty wild Idea

      Possible higher rpms might cause this, but unlikely, unless you are keeping the rpms near the redline all the time?? 5-7000rpms. With 456 gears around town you shift alot more, start out in 2nd gear even, I switched out my 456's for 411's, still high but at least I can go 70 mph on the highway.
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        • Mike M.
          NCRS Past President
          • May 31, 1974
          • 8382
          #3
          Re: pretty wild Idea

          get a new expert. mike
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            • Dan B.
              Expired
              • July 13, 2011
              • 545
              #4
              Re: pretty wild Idea

              Did you replace the rear seal yourself, it's very easy to have a repetitive leak there if the proper seal is not installed per the seal makers instructions.
              RPM's have nothing to do with oil leaks.
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                • Mark E.
                  Extremely Frequent Poster
                  • April 1, 1993
                  • 4536
                  #5
                  Re: pretty wild Idea

                  Clean up the outside of the engine really good (Dawn dish soap, warm water and a scrub brush work great), then add UV dye to the crankcase and look for leaks using a black light.

                  It's surprising how many RMS leaks are really from the valve covers or oil sending unit.
                  Mark Edmondson
                  Dallas, Texas
                  Texas Chapter
                  1970 Coupe, Donnybrooke Green, Light Saddle LS5 M20 A31 C60 G81 N37 N40 UA6 U79
                  1993 Coupe, 40th Anniversary, 6-speed, PEG 1, FX3, CD, Bronze Top
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                    • Gary C.
                      Administrator
                      • October 1, 1982
                      • 17659
                      #6
                      Re: pretty wild Idea

                      Bruce,

                      Have you checked the PCV valve to make sure its functioning ?

                      Gary
                      ....
                      NCRS Texas Chapter
                      https://www.ncrstexas.org/
                      https://www.facebook.com/profile.php?id=61565408483631
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                        • Bruce W.
                          Very Frequent User
                          • June 30, 1997
                          • 358
                          #7
                          Re: pretty wild Idea

                          no had a guy with 50 years of experience. sounded bogus to me. Mike McCagh had the best advice "get a new "expert"
                          BW
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                            • Bruce W.
                              Very Frequent User
                              • June 30, 1997
                              • 358
                              #8
                              Re: pretty wild Idea

                              William, certainly not driving at red line
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                                • Philip A.
                                  Expired
                                  • February 26, 2008
                                  • 329
                                  #9
                                  Re: pretty wild Idea

                                  Originally posted by Gary Chesnut (5895)
                                  Bruce,

                                  Have you checked the PCV valve to make sure its functioning ?

                                  Gary
                                  ....
                                  Had same/similar oil leak situation and this was the cause. At higher rpms, pressure would build inside engine and blow oil out past the rear intake manifold gasket.
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                                    • Bruce W.
                                      Very Frequent User
                                      • June 30, 1997
                                      • 358
                                      #10
                                      Re: pretty wild Idea

                                      does a 65 327 have a PCV valve?
                                      BW
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