There are no many reasons :
-check the glowplugs one by one or check with an amp meter how much they suck: it's betwen 10 and 12 amps per glowplug so 60minimum to 72 amps for 6 working glowplugs.
-check the timing on the pump.
i made a video
[video=youtube;FTXAm4P6nXU]http://www.youtube.com/watch?v=FTXAm4P6nXU&feature=plcp[/video]
-check the valve adjustment (if you have tappets and not hydraulic lifters) just to be sure.
one or two valves are maybe not well closed when the metal is retracted.
You have grey smoke ? the pump is not well ajusted.
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