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Engine timing, Corsa B z12sz

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  • [Corsa B 1993-2000] Engine timing, Corsa B z12sz

    Hey guys, is there any guides on how to time the engine on the z12sz, have attempted to get the bottom pully off but to no avail, foot on break and 3rd gear the engine still turned over...

    any ideas?

  • #2
    Have you got the Haynes for it? The timing is pretty straightforward, line up the crankshaft pulley with the mark on the camshaft sprocket lining up the with the mark on the timing cover. When both line up it's a no.1 TDC.

    Crankshaft pulley bolt can be very tight - usual method is to engage top gear (top gear gives most leverage), get an assistant to really stand on the brakes and that ought to lock things enough to move the bolt. You'll need a decent breaker bar. If the engine turns check if the brakes are holding, if they are then the clutch is slipping.

    Alternative is to remove the starter and jam a metal bar in the flywheel ring gear.
    1972 Viva restoration thread - http://www.thecorsa.co.uk/projects-b....html#post1534

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    • #3
      Thanks Taurus for the help.

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      • #4
        Still struggling with the engine timing. getting nowhere with it. engine is back together but as its trying to fire up the air box is popping.. we have lined up all the marks but still wont fire?

        Are there any pictures with the marks, in the book the bottom pully has a groove and mine dosnt but a smoothed out block bit on the back of the pully.

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        • #5
          Sounds like the timing is wrong - they're non-interference so it's not going to break anything. The crankshaft pulley ought to have a groove in it - it's not huge, just a small nick. If the pulley has been damaged then remove it and check the timing mark on the crankshaft sprocket behind it, then make a mark on the pulley in the right place.

          If the worst comes to the worst set the camshaft to No.1 at TDC using the mark on the camshaft sprocket and making sure the cam lobes for No.1 are on the firing stroke. Then line up the crankshaft using a wooden dowel in the plug hole to see when it's at TDC. Shouldn't be far out if you do it that way.
          1972 Viva restoration thread - http://www.thecorsa.co.uk/projects-b....html#post1534

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          • #6
            The pulley's outer edge is completely smooth, there is no marks on there at all?

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            • #7
              I have same issue pulley modified to fix A/C,

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              • #8
                If you remove the crank pulley .The toothed sproket that's behind it will have a arrow on it must line up on the notch on the oil pump strait down .Make sure cam sproket and crank sproket are lined up remove cam cover
                Check that number 1 is rocking .meaning both valves are closed .This is valve timing for corsa c .should be the same on corsa b

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                • #9
                  Don't thumb suck it .Make sure the marks line up turn the motor by hand twice and check the marks again .or you will bend the valves

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                  • #10
                    Hi all,

                    engine - C12NZ Corsa B -1995

                    remove the timing belt and reset the timing but timing marks not align as i expected cam sprocket mark bit 4mm away, how to fix it? before this i had more than 8mm difference and misfire but now (with 4mm) much better.

                    so how to fix this issue perfectly

                    also i has following compression issues in cylinders 1 - 187 psi, 2- 185 psi, 3 - 185 psi, 4 - 200 psi (no leaks) 1-3 plugs in black color, 4 in clean and good , do i need to change rings ?

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                    • #11
                      Sounds like it's a tooth out - they can do that when you tension them, you need to rotate a few times by hand to really make sure. Take the belt off, align the timing marks, refit belt, rotate by hand to make sure it all stays in place.

                      Compressions sound fine so leave well alone.
                      1972 Viva restoration thread - http://www.thecorsa.co.uk/projects-b....html#post1534

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                      • #12
                        Originally posted by Taurus View Post
                        Sounds like it's a tooth out - they can do that when you tension them, you need to rotate a few times by hand to really make sure. Take the belt off, align the timing marks, refit belt, rotate by hand to make sure it all stays in place.

                        Compressions sound fine so leave well alone.
                        what is the correct way to fit the belt and tension,
                        in many guides ask to tension using water pump, but one of the nuts of pump covered by tensioner,

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                        • #13
                          Yes on the corsa you will see 2 marks on the tensioner 1 is like a notch and the other is a arrow pull them together you will see 2 small holes that line up lock them in place with a small screw driver. Install the belt adjust the water pump till the slack is taken up on the belt .remove the screw driver .The arrow on tensioner will be to high now .adjust the water pump till the 2 marks line up on the tentioner .turn the motor 2 full revolutions .adjusted check all the timming marks and tentioner marks .

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                          • #14
                            And turn by hand only .use a strong arm on your crank pulley don't turn on the cam sproket

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                            • #15
                              this is my cam sproket Click image for larger version

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                              Last edited by aravindar; 02-07-2015, 08:34 AM.

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