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Ensuring that number 1 piston is at TDC


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I need to replace the gasket in my 300TDi brake servo vacuum pump.

Step 1 of this according to the 300TDi "Engine Overhaul manual" says " Ensure that number 1 piston is at TDC" then unbolt etc etc

Given that I only want to chnage the gasket and not take the head off - how can I do this ?? Or do it not need to !

Thanks

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A double check and some what better in that it confirms that you are both at TDC on number one and on the compression stroke, is as follows:

Remove the glow plug from no.1 cylinder.

Push some rolled up paper towel into the glow plug hole.

Turn the crank until the paper towel pops out, hitting you in the eye and permenantly blinding you.

You should then find you are at or around one of the holes in the flywheel. If not you can GENTLY insert a screw driver or simlilar into the glowplug hole and continue to turn the crank, CAREFULLY making sure the screw driver doesn't bind up, until the screw driver goes up and then starts to go down again on the piston stroke.

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