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No oil to top holes on rocker arms after rebuild

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  • No oil to top holes on rocker arms after rebuild

    Problem
    After rebuilding head (including valves, guides, new cam, new rocker shaft and new rocker arms) I am not getting oil to top hole of all 12 rocker arms. After 30 miles, one valve seized to valve guide (I did not check oil to rocker assembly before running engine. My bad). 1976 TR6 with only 36,000 miles. 70 lb oil pressure at cold start up and about 25 to 30 lb at idle when hot using 20/50.
    I have
    1. Checked oil feeds from cam bearing to rocker shaft to be sure they were open and clear
    2. After installing external oiler from oil sensor area on block to head I am getting good oil dripping from the rocker shaft but not to any of the top holes in rocker arms
    Planning
    Machinist to put oil clearance between rocker shaft and rocker arms to 0.001 inch or less per his
    experience.
    Question
    Are the oil supply holes in the rocker shaft supposed to be on the top or bottom shaft when installed in the engine? If oil supply hole on rocker shaft are at the bottom like the one I have, looks like little or no oil will get to top hole on rocker arm which of course is my problem. Rocker shaft is new and clean inside as well.

  • #2
    Doesnt the screw in the pedestal on the firewall end of the assembly locate and orient the rocker shaft, as well as seal/maintaing the pressure and oil flow through it?

    Memory is foggy.
    '74 TR6 CF13007U aka "Mr. T"
    Custom Blue (Delft-Like) and New Tan (Formerly Mallard and New Tan)
    Points, Ballast Bypassed, Bosch Blue Coil, Moss Cobalt Wires, Champion RN12YC plugs.
    Peaks and tweaks, but the spirit of Original
    Redlines always.
    My wife is the Driver, I'm just the Mechanic....

    Comment


    • #3
      Yes, the screw in the pedestal to the rocker shaft does orient the shaft and it is oriented with the holes facing the ground. My problem is that I am getting oil dripping from the shaft and not getting any oil to the top hole to provide oil to the valve and valve guides. I am at a loss to figure out why oil is not getting there unless holes on wrong side. Next step for me is having a machinist size new rocker arms to a new rocker shaft with a closer tolerance.

      Comment


      • #4
        Click image for larger version

Name:	
Views:	1
Size:	369.2 KB
ID:	523405 Here's mine.
        Driving a 1973 TR6
        Doing ZS carb repairs
        email kencorsaw"at"aol.com

        Comment


        • #5
          Or send the assembly to these folks

          http://www.rockerarms.com/
          '74 TR6 CF13007U aka "Mr. T"
          Custom Blue (Delft-Like) and New Tan (Formerly Mallard and New Tan)
          Points, Ballast Bypassed, Bosch Blue Coil, Moss Cobalt Wires, Champion RN12YC plugs.
          Peaks and tweaks, but the spirit of Original
          Redlines always.
          My wife is the Driver, I'm just the Mechanic....

          Comment


          • #6
            Click image for larger version

Name:	
Views:	1
Size:	511.7 KB
ID:	523414 Oil ports inside the rocker arm.
            Driving a 1973 TR6
            Doing ZS carb repairs
            email kencorsaw"at"aol.com

            Comment


            • #7
              .001" or less seems awful tight for rocker arms to me. I think something else must be going on, you shouldn't need to go to that extreme.

              ***EDIT, ignore this following line, you covered that in your original post****
              Were the plugs pulled from the new rocker shaft to clean the inside? Every new rocker shaft I've purchased has come full of machining crud that could be blocking flow.

              Were the valve to guide clearances set with the new valves and guides? What type of guides were used?

              Jason

              Comment


              • #8
                Hi Poolboy, have seen a lot of your posts. So your shaft looks to be about 30 degrees off perpendicular to the earth (ground). And the holes in your rocker arms are the same as mine. So do you think the orientation of your rocker shaft would feed both oil feed holes on my rocker arms (as well as yours (i.e. does your rocker assembly work OK?)?

                TR6harris Yeah, I am thinking about sending rocker assembly to rockerarms.com

                Comment


                • #9
                  Originally posted by Montana View Post
                  Problem
                  After rebuilding head (including valves, guides, new cam, new rocker shaft and new rocker arms) I am not getting oil to top hole of all 12 rocker arms. After 30 miles, one valve seized to valve guide (I did not check oil to rocker assembly before running engine. My bad). 1976 TR6 with only 36,000 miles. 70 lb oil pressure at cold start up and about 25 to 30 lb at idle when hot using 20/50.
                  I have
                  1. Checked oil feeds from cam bearing to rocker shaft to be sure they were open and clear
                  2. After installing external oiler from oil sensor area on block to head I am getting good oil dripping from the rocker shaft but not to any of the top holes in rocker arms
                  Planning
                  Machinist to put oil clearance between rocker shaft and rocker arms to 0.001 inch or less per his
                  experience.
                  Question
                  Are the oil supply holes in the rocker shaft supposed to be on the top or bottom shaft when installed in the engine? If oil supply hole on rocker shaft are at the bottom like the one I have, looks like little or no oil will get to top hole on rocker arm which of course is my problem. Rocker shaft is new and clean inside as well.
                  Montana --- The oil feed holes are at 90 deg (270 in the photo) while the set screw that locates the shaft being at 15 deg. on the opposite side. I believe the side placement of the oil feed holes is what Triumph decided would give the most lubrication when the rockers are under stress. Looking at the rear end of the shaft towards the front, the shiny area on the old shaft would match up well with this placement of the holes.

                  Dick

                  I agree that the holes thru the shaft should be checked for clearance. I did this by submerging the shaft in a tub with water covering the shaft. Compressed air placed at the oil entry point showed that all 12 holes had bubbles with air coming out. Click image for larger version

Name:	
Views:	1
Size:	76.9 KB
ID:	523423
                  Last edited by dicta; 06-08-2019, 06:48 PM.

                  Comment


                  • #10
                    Hi jsukey. Yeah, my "new" rocker shafts had crap in them on first shaft but cleaned crap out on second shaft (thanks India). Yeah or yup, "Were the valve to guide clearances set with the new valves and guides" but I did not check the measured clearance between shaft and rocker arms but did it by feel. My bad again.

                    Comment


                    • #11
                      Hi Dick. I did check the holes coming out of the shaft to make sure they were open by manually checking with the biggest drill bit that would fit (as well as pulling plugs and cleaning said bore). But you think that the orientation of the rocker shaft to rocker arms is good?

                      Comment


                      • #12
                        The clearance between shaft and rockers should be 0.002". The shaft should be hardened and the rockers should have bronze bushings.
                        The aft part of the shaft has a hole with thread. If you bought the shaft from one of our recommend suppliers, the shaft is ok. do not overdrill the holes! just be sure they are clean.
                        If you install the rockers, run the engine and from the oil port on the rockers, oil should be coming out. # 1 will takes longest.
                        You can also check this with setting an adapter rod on the oil pump and turn it with an electrical drill. Be sure to put the camshaft in the proper position. The camshaft feeds the aft pedestal.
                        My rockers #1 and 2 ran dry also, I installed the oil feed kit. Runs great.
                        Jochem
                        Flying Dutchman drives: TR6 - 1973 - 56/11 - CF1xxxxUO - J-OD - Kent 280° - EMU Black - Phoenix - 205/70 on 7x15

                        Comment


                        • #13
                          At idle oil won't be spurting out of those top holes like a whale's blow hole, rather more like a slow moving lava flow..At first it may just extrude a few air bubbles with an oil skin until all the air gets pushed out of the rocker shaft..
                          Driving a 1973 TR6
                          Doing ZS carb repairs
                          email kencorsaw"at"aol.com

                          Comment


                          • #14
                            Both before and after I installed the external oiler to the head, was not getting any oil at all from the top rocker hole and they were completely dry. I took a closer look at the picture of the rocker arms with bushings on the Moss site that has a groove in the bushing in line with the 2 oil holes in the rocker arm that should allow oil to get up to top hole easier. I am thinking my best bet is to get the Moss rocker arms and make sure I have 0.002" clearance or a little less.

                            Comment


                            • #15
                              http://www.rockerarms.com/
                              '74 TR6 CF13007U aka "Mr. T"
                              Custom Blue (Delft-Like) and New Tan (Formerly Mallard and New Tan)
                              Points, Ballast Bypassed, Bosch Blue Coil, Moss Cobalt Wires, Champion RN12YC plugs.
                              Peaks and tweaks, but the spirit of Original
                              Redlines always.
                              My wife is the Driver, I'm just the Mechanic....

                              Comment

                              No oil to top holes on rocker arms after rebuild

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