need help

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  • i_pooped
    Member
    • Nov 2015
    • 44

    #1

    need help

    i had a head milled and i used a erling head gasket and when i started the car it has making a loud tap noise so i tore the engine back down to find this..

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    could i get a thicker head gasket or should i get a new head????
    its only on cylinder 6 and a lil on the head on cylinder 5
    Last edited by i_pooped; 02-01-2017, 09:18 PM.
  • e30davie
    E30 Mastermind
    • Apr 2016
    • 1788

    #2
    Did you rotate the engine by hand before you started it?

    And when you pulled it down did you check if you had the cam timing correct?

    Comment

    • i_pooped
      Member
      • Nov 2015
      • 44

      #3
      i double check timing before i started and before i tore it down and it was in time

      Comment

      • digger
        R3V Elite
        • Nov 2005
        • 5911

        #4
        that's not a cam timing issue, so how much was milled off the head? im wondering what kind of damage it could have done to bearings/rod or something depends how hard of a kiss it was.

        you could use a 1mm thicker MLS gasket atleast that would give you 1mm clearance which is about what you want on a static measurement
        89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...

        new build thread http://www.r3vlimited.com/board/showthread.php?t=317505

        Comment

        • i_pooped
          Member
          • Nov 2015
          • 44

          #5
          i dont know, is there a way to tell

          Comment

          • digger
            R3V Elite
            • Nov 2005
            • 5911

            #6
            whats the head thickness at each corner?
            89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...

            new build thread http://www.r3vlimited.com/board/showthread.php?t=317505

            Comment

            • i_pooped
              Member
              • Nov 2015
              • 44

              #7
              its 4 15/16 inches at all 4...... sound right?

              Comment

              • digger
                R3V Elite
                • Nov 2005
                • 5911

                #8
                4.9375" sounds wrong to me. did you measure the parallel distance with a suitable tool?



                i measured a head ive got here with a set of vernier calipers and it was 125.04 mm smack where it should be

                what crank is in the bottom end?
                89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...

                new build thread http://www.r3vlimited.com/board/showthread.php?t=317505

                Comment

                • i_pooped
                  Member
                  • Nov 2015
                  • 44

                  #9
                  the tool i used wasnt very accurate so i will get a different tool today to remeasure. its the 2.5 bottom

                  Comment

                  • Kershaw
                    R3V OG
                    • Feb 2010
                    • 11822

                    #10
                    Just so I understand what I'm looking at, the piston hit the actual cylinder head?
                    AWD > RWD

                    Comment

                    • i_pooped
                      Member
                      • Nov 2015
                      • 44

                      #11
                      yea its heating the head but only on cylinder 6 and a lil on 5

                      Comment

                      • i_pooped
                        Member
                        • Nov 2015
                        • 44

                        #12
                        123.8mm

                        Comment

                        • i_pooped
                          Member
                          • Nov 2015
                          • 44

                          #13
                          so is it trash or will a .3mm thicker head gasket work????

                          Comment

                          • digger
                            R3V Elite
                            • Nov 2005
                            • 5911

                            #14
                            Originally posted by i_pooped
                            123.8mm
                            That makes sense, its 1.3mm thinner than the original spec of 125.1mm
                            i.e. 125.1 - 123.8 = 1.3mm

                            Nominal piston to head clearance is 1.25mm for a 1.75mm gasket
                            i.e. 75/2 + 135 + 34.2 = 206.7mm (stack height = crank throw + rod length + piston compression height) )

                            Piston sits 206.7-206.2 = 0.5mm above deck (block deck height ive measured is 206.2)

                            Gasket 1.75mm less amount piston sits above block (0.5mm) = 1.25mm

                            So you have machined all the clearance away

                            So you need an extra 1.00-1.10mm thicker gasket (2.8mm / 0.110” total) which means you need a custom MLS as the replacement thicker OEM is 2.05mm thick (+0.3)

                            assuming there are no other issues that resulted
                            89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...

                            new build thread http://www.r3vlimited.com/board/showthread.php?t=317505

                            Comment

                            • i_pooped
                              Member
                              • Nov 2015
                              • 44

                              #15
                              ok thanks

                              Comment

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