Can you bend a valve if...?

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  • graphikg
    Banned
    • Jan 2008
    • 1614

    #1

    Can you bend a valve if...?

    If you jumped the car by engaging the clutch while it is rolling? I did just that and I started to hear this tick afterwards. I started the car the next day and I still heard the same thing. WTF?
  • u3b3rg33k
    R3VLimited
    • Jan 2010
    • 2452

    #2
    I've done that too many times with no new noises afterward. I don't see how that would bend a valve or cause any other problems unless you did something excessively stupid.

    Ich gehöre nicht zur Baader-Meinhof Gruppe

    Originally posted by Top Gear
    Just imagine waking up and remembering you're Mexican.

    Every time you buy a car with DSC/ESC, Jesus kills a baby seal. With a kitten.


    Comment

    • nando
      Moderator
      • Nov 2003
      • 34827

      #3
      no, not unless you somehow skipped timing on the chain.
      Build thread

      Bimmerlabs

      Comment

      • JGood
        R3V OG
        • Jan 2004
        • 7959

        #4
        Exhaust leak? Maybe a small crack opened up slightly during the abrupt jerking around of the engine?
        85 325e m60b44 6 speed / 89 535i
        e30 restoration and V8 swap
        24 Hours of Lemons e30 build

        Comment

        • graphikg
          Banned
          • Jan 2008
          • 1614

          #5
          ^^^^^ Hmmmm. Well, I am running on just headers right now. I will check if my headers moved around a little.

          Comment

          • JGood
            R3V OG
            • Jan 2004
            • 7959

            #6
            Originally posted by graphikg
            ^^^^^ Hmmmm. Well, I am running on just headers right now. I will check if my headers moved around a little.
            You're running open headers, and can hear a tick?
            85 325e m60b44 6 speed / 89 535i
            e30 restoration and V8 swap
            24 Hours of Lemons e30 build

            Comment

            • Devil Inc
              E30 Modder
              • Jan 2008
              • 802

              #7
              That would be my question.

              Comment

              • Wh33lhop
                R3V OG
                • Feb 2009
                • 11705

                #8
                Originally posted by JGood
                You're running open headers, and can hear anything?
                paint sucks

                Comment

                • u3b3rg33k
                  R3VLimited
                  • Jan 2010
                  • 2452

                  #9
                  Originally posted by JGood
                  Exhaust leak? Maybe a small crack opened up slightly during the abrupt jerking around of the engine?
                  Abrupt jerking as compared to the motion of a running engine?

                  Originally posted by JGood
                  You're running open headers, and can hear a tick?
                  This.

                  Ich gehöre nicht zur Baader-Meinhof Gruppe

                  Originally posted by Top Gear
                  Just imagine waking up and remembering you're Mexican.

                  Every time you buy a car with DSC/ESC, Jesus kills a baby seal. With a kitten.


                  Comment

                  • graphikg
                    Banned
                    • Jan 2008
                    • 1614

                    #10
                    Trust me, I can hear a tick. Its actually pretty loud. I am at work, but I will try to get a sound clip on here so you can hear it for yourselves. I hope it is not a bent valve, but the car is running like sh** and is ticking for sure. I am going to take it to a shop for diagnoses, but got to get my exhaust sys taken care of first.

                    Comment

                    • hoveringuy
                      R3VLimited
                      • Dec 2005
                      • 2679

                      #11
                      No.

                      The only time I would NEVER jump the car that way is if it involves rain or water.

                      True story: I tried to start my 914 after a heavy rain once and it only cranked briefly before stopping. I thought "WTF?" and considered push starting it for a dead battery until I had the sense to pull a spark plug.

                      Water came out.

                      Water had run down my carbs and filled the cylinders, the engine was hydro-locked. Push starting it would have bown the cylinder heads off.

                      I pulled all the plugs, cranked the water out for a minute, put the plugs back in and drove it to my scheduled brief. Changed the oil that night.

                      VW's!

                      Comment

                      • nando
                        Moderator
                        • Nov 2003
                        • 34827

                        #12
                        You can't bend the valve by push starting your car. the only way to do that is if the chain breaks or skips teeth, which is nearly impossible.
                        Build thread

                        Bimmerlabs

                        Comment

                        • JGood
                          R3V OG
                          • Jan 2004
                          • 7959

                          #13
                          Originally posted by u3b3rg33k
                          Abrupt jerking as compared to the motion of a running engine?
                          Yes. The exhaust is mounted solid to the engine, and attached to the chassis. So any hard jolt of the engine could tweak the exhaust and open up a small crack even more. Normal running doesn't involve the same type of hit to the engine as pop starting it does.

                          It's just a slight possibility, a random suggestion. There's not much to 'tap' on an m50... injector, lifter, exhaust, maybe a valve.
                          85 325e m60b44 6 speed / 89 535i
                          e30 restoration and V8 swap
                          24 Hours of Lemons e30 build

                          Comment

                          • u3b3rg33k
                            R3VLimited
                            • Jan 2010
                            • 2452

                            #14
                            If your engine moves that much, your mounts are shot.

                            Ich gehöre nicht zur Baader-Meinhof Gruppe

                            Originally posted by Top Gear
                            Just imagine waking up and remembering you're Mexican.

                            Every time you buy a car with DSC/ESC, Jesus kills a baby seal. With a kitten.


                            Comment

                            • JGood
                              R3V OG
                              • Jan 2004
                              • 7959

                              #15
                              Originally posted by u3b3rg33k
                              If your engine moves that much, your mounts are shot.
                              Maybe they are. It was a suggestion. Are you done beating it down now?
                              85 325e m60b44 6 speed / 89 535i
                              e30 restoration and V8 swap
                              24 Hours of Lemons e30 build

                              Comment

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