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Cambelt problem

Hi all.

 

Started my little service on my 300zx twin turbo. im at the stage where im putting the new cambelt on. Ive set no.1 to tdc and lined up marks on the pulleys and sprockets to their marks and dots as said in workshop manual. I put belt on starting at the crankshaft pulley and work my way round anticlockwise. As soon as i start to move the tensioner towards belt to bolt it in place some sprockets move and are no longer on there timing marks. At this point i take belt off adjust sprockets back on thier marks and start again and i lose everytime.:(

 

Anyone know of a method to keep the top 4 sprockets still and locked in place when i install the cambelt?:)

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    • Featured Replies

    It doesnt matter if the sprockets move slightly as long as the lines on the belt are adjacent the cut outs in the sprockets then you are still on the money.

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    • Author

    Seriously jimmer.

     

    i cant believe that when some sprockets move when tension is applied will it not knock it out of time? How much movement is allowed on the sprockets when tensioning?

     

    i believe you jimmer but i must be 100% sure though before i go do it tommorow.

  • Quote
    Seriously jimmer.

     

    i cant believe that when some sprockets move when tension is applied will it not knock it out of time? How much movement is allowed on the sprockets when tensioning?

     

    i believe you jimmer but i must be 100% sure though before i go do it tommorow.

     

    get someone to help and hold the belt - it's going to move! If you're really worried, you can count the teeth round the belt... there's an FAQ somewhere if you do a search...

     

    good luck!

  • Quote
    Seriously jimmer.

     

    i cant believe that when some sprockets move when tension is applied will it not knock it out of time? How much movement is allowed on the sprockets when tensioning?

     

    i believe you jimmer but i must be 100% sure though before i go do it tommorow.

     

    As i said the new belt will have lines on it that sit adjacent the cut outs in the sprockets.As long as these lines and cut outs are lined up correctly and the dot on the crank sprocket is next to the belt line the timing will be fine.The dimples on the back plates are only a guide as the belt lines are what should be used when timing the engine.If your still not sure id get somebody in to do it for you as a mistake will prove costly.

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    • Author

    thanks jimmer for the help, im sorting it tommorow:)

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