Help discovery 2 will not start after timing chain snapped

So in effect timing is achieved mechanically then and it's just the quantity of fuel released that's controlled by the ECU.

something like that... that's the way these engines with ''pump injectors'' are working

still don't know how it knows it is on the power stroke, maybe it fires injectors at every TDC but will only injects fuel when the lobe on the cam shaft is in the right position, ie every other TDC per cylinder.

Think it operates the injector on both strokes, just that only one of them will the injector be fired by the compression of the rocker arm... it only fires if there's sufficient pressure of fuel.

Still not able to start after checking everything is it just being s b***h on the purge

I'm curious as to why the timing chain snapped in the first place. It shouldn't have done. Something in the engine drive chain must have locked up to cause this. Have you investigated?

Nigel1943 said:

I'm curious as to why the timing chain snapped in the first place. It shouldn't have done. Something in the engine drive chain must have locked up to cause this. Have you investigated?

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Chain breakage in Td5's is not uncommon, or so I've heard and read, beggared if I know why though, perhaps the chosen chain is underrated for the job, who knows, most other engines with chains will run until the chain is stretched beyond belief and rattling like a marble in a trash can, in my experience.
I aspired at one stage to convert my Tdi engine to chain drive cam etc, I believe it is doable, but from what I've heard, I'll stick with the elastic band and just replace it regularly.
I realise this diversion does not help with the original question, but because of such problems with electronics etc is why I am keeping my Tdi, the technology employed is in keeping with my mechanical abilities.

Maybe so, but I've not heard of it and at147k it really shouldn't happen.

I think that a rocker got broken and the bits found there way into the chain as there were quite a few pieces in the sump.

Are you sure that the cam timing is correct and that the pump timing is correct ??