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    TDC Question

    Hello folks. I'm workin on my 1979 GS850G at the moment. I'm planning on removing the cylinder head and jugs. Is it recommended to put the engine at TDC prior to doing so? I know I'll have to do it prior to putting the engine back together, just wanted to know if there's any benefit to doing it prior to dismantling?
    Ryan

    1979 GS850G - currently undergoing a major overhaul
    1986 GSX-R750 - I'm figuring it out

    #2
    No benefit - it'll move when you pull the cylinders anyway.

    Comment


      #3
      Originally posted by GregT View Post
      No benefit - it'll move when you pull the cylinders anyway.
      Right, got it. I didn't think there was but thought I'd ask. Thanks GregT.
      Ryan

      1979 GS850G - currently undergoing a major overhaul
      1986 GSX-R750 - I'm figuring it out

      Comment


        #4
        As for putting it back together, you’ll likely find it easiest to have 2 & 3 up first, get those started, before turning the crank to get the 1 & 4 in. You don’t need to consider the exact position of the crank until you set the cams.
        Rich
        1982 GS 750TZ
        2015 Triumph Tiger 1200

        BikeCliff's / Charging System Sorted / Posting Pics
        Destroy-Rebuild 750T/ Destroy-Rebuild part deux

        Comment


          #5
          Originally posted by Rich82GS750TZ View Post
          As for putting it back together, you’ll likely find it easiest to have 2 & 3 up first, get those started, before turning the crank to get the 1 & 4 in. You don’t need to consider the exact position of the crank until you set the cams.
          Are you referring to putting the jugs back on Rich?
          Ryan

          1979 GS850G - currently undergoing a major overhaul
          1986 GSX-R750 - I'm figuring it out

          Comment


            #6
            Yes, when putting the jugs down over the pistons.
            Rich
            1982 GS 750TZ
            2015 Triumph Tiger 1200

            BikeCliff's / Charging System Sorted / Posting Pics
            Destroy-Rebuild 750T/ Destroy-Rebuild part deux

            Comment


              #7
              Correct. The Clymer service manual shows a couple blocks of wood that help holding the pistons up while you slide the cylinders down. It’s basically a 1x4 that is narrowed to fit between the studs and has a long slot down the middle that is wide enough to slide past the rod. It looks like a tuning fork without a handle.

              .
              sigpic
              mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
              hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
              #1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
              #2 son: 1980 GS1000G
              Family Portrait
              Siblings and Spouses
              Mom's first ride
              Want a copy of my valve adjust spreadsheet for your 2-valve per cylinder engine? Send me an e-mail request (not a PM)
              (Click on my username in the upper-left corner for e-mail info.)

              Comment


                #8
                Originally posted by Rich82GS750TZ View Post
                Yes, when putting the jugs down over the pistons.
                Thanks Rich. That's great info.
                Ryan

                1979 GS850G - currently undergoing a major overhaul
                1986 GSX-R750 - I'm figuring it out

                Comment


                  #9
                  Yes, my Clymer manual is much more detailed in describing the cylinder installation than the Factory manual.

                  Rich
                  1982 GS 750TZ
                  2015 Triumph Tiger 1200

                  BikeCliff's / Charging System Sorted / Posting Pics
                  Destroy-Rebuild 750T/ Destroy-Rebuild part deux

                  Comment


                    #10
                    Originally posted by Steve View Post
                    Correct. The Clymer service manual shows a couple blocks of wood that help holding the pistons up while you slide the cylinders down. It’s basically a 1x4 that is narrowed to fit between the studs and has a long slot down the middle that is wide enough to slide past the rod. It looks like a tuning fork without a handle.
                    Yup, I've got the pic you're referring to Steve.

                    Ryan

                    1979 GS850G - currently undergoing a major overhaul
                    1986 GSX-R750 - I'm figuring it out

                    Comment


                      #11
                      Originally posted by Rich82GS750TZ View Post
                      Yes, my Clymer manual is much more detailed in describing the cylinder installation than the Factory manual.
                      Wow Rich, your manual IS more detailed. Thanks for posting that pic man
                      Ryan

                      1979 GS850G - currently undergoing a major overhaul
                      1986 GSX-R750 - I'm figuring it out

                      Comment


                        #12
                        Originally posted by RustyTank View Post
                        Wow Rich, your manual IS more detailed. Thanks for posting that pic man
                        The factory manual is written for factory-trained technicians, therefore it assumes that you got a bunch of those inside tips in your training.

                        The Clymer (and Haynes) manual is pretty much written for the rest of us.

                        For specs, I generally trust OEM over the others, but I have seen errors is ALL of them.

                        .
                        sigpic
                        mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
                        hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
                        #1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
                        #2 son: 1980 GS1000G
                        Family Portrait
                        Siblings and Spouses
                        Mom's first ride
                        Want a copy of my valve adjust spreadsheet for your 2-valve per cylinder engine? Send me an e-mail request (not a PM)
                        (Click on my username in the upper-left corner for e-mail info.)

                        Comment


                          #13
                          Originally posted by Steve View Post
                          The factory manual is written for factory-trained technicians, therefore it assumes that you got a bunch of those inside tips in your training.

                          The Clymer (and Haynes) manual is pretty much written for the rest of us.

                          For specs, I generally trust OEM over the others, but I have seen errors is ALL of them.

                          .
                          Completely unrelated Steve, I just sent you an email regarding the valve adjust spreadsheet for my 2-valve per cylinder engine
                          Ryan

                          1979 GS850G - currently undergoing a major overhaul
                          1986 GSX-R750 - I'm figuring it out

                          Comment


                            #14
                            Just make sure you keep the timing chain snug when you turn the motor over with the cams out. The chain
                            can bunch up around the crank gear.

                            Mad
                            83 GS750E
                            2006 ZX14
                            2004 KTM 450 EXC
                            2001 Yamaha Big Bear

                            Comment


                              #15
                              Originally posted by Maddevill View Post
                              Just make sure you keep the timing chain snug when you turn the motor over with the cams out. The chain
                              can bunch up around the crank gear.

                              Mad
                              Ooof...great suggestion. Thanks Mad.
                              Ryan

                              1979 GS850G - currently undergoing a major overhaul
                              1986 GSX-R750 - I'm figuring it out

                              Comment

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