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Thread: XE Valve timing

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    Default XE Valve timing

    I have just put my XE back together after the oil pump.

    I bought new cam pulleys as the originals had a bit of wear.

    I put it all back together and it was running badly.....I tried moving the teeth on the cams one forward and one backwards....no joy.

    Then I realised there is a front and rear pulley...oops I had them the wrong way.

    I have tried to get it running tonight (2 and half hours in the rain) and I am getting nowhere.

    Before turning the engine, I turn the engine by hand two revolutions. If it won't turn then I didn't turn the engine as I was worried that it would burst valves so I have it on the easiest to turn.


    Is there a way to check the cam timing? The crank pulley is an aftermarket job with no mark.

    Has someone got a pic of the two cam pulleys just so I can check I am aligning them correctly.

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    Club Member Club Member dgbnova#1's Avatar
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    O my god there is no mark so how did you time it ?
    Im not sure about the front to back pullys but just guessing and putting it 2 teeth out is prob not the best idea
    if I was you would get it timed spot on by someone who knows about the engines and then do a compression test on it to see if there is any at all

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    soz marc, posted in your oil pump thread.

    as well as those other pics... if you have no marker on the aux pulley. you can make one yourself, by turning the engine over by hand with plug no.1 out, and using something suitable, like a wire coat hanger or a blunt edged long screwdriver + torch to double check, when piston no.1 is at its peak point in height, thats TDC, top dead centre.

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    Senior User craig green's Avatar
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    Agree TDC can be found using something blunt down no1 cylinder (plug out). There is a dimple punch mark on the toothed lower pulley which is much more reliable for these purposes rather than the outer GM pulley with the pointer on which is rubber mounted to its inner & can be innaccurate.

    Should be plenty of guides with pics on various forums. Just be precise & make sure the upper pointers line up with the markings, even just a fraction out isnt good enough.

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    Thanks for that, I recall from somewhere before the piston no1 thing, I'll be ready for looking at the pulley in more datail and checking with the piston tomorrow then!

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    That's really clever!

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    Inlet and exhaust cam pulleys are the same, you sure you have XE ones?

    crank pulley has a mark that lines up with a notch in the metal backing plate and oil pump right at the bottom.

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    Never time it up using the aux pulley, aftermarket or not as the rubber damper can slip round.

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    Like Lee said, the damper slips and makes the bottom pulley useless as a timing tool!
    take yours off and spin the crank around to line the notches up. Hope you haven't already nicked the vales though!

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