Locked solid lump

reeac said:
Best bet is to use a socket plus long handle on the crankshaft and kick it. Kicking is far more effective than using hands when shifting stubborn car wheel nuts. You might need an extension to the socket to get clear of the engine compartment in which case arrange a solid support (jack or block of wood) under the outer end of the extension.
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But kick it backwards, i.e away from compression, in reverse
 
Retrieved the injectors before they are serviced to see if I can check the compression on both cylinders by turning the hand start as suggested. Something for the weekend...
 
Unless you're Geoff capes you'll struggle to turn it through one cycle let alone get enough speed to give a decent compression reading, unless the compression is cream crackered of course. Starter motor is the only way really.
 
Fair comment, Geoff Capes I am not. Was hoping to feel the irregular movement of the piston as it went through the cycle. Will put one injector back at a time and try hand then electric.
 
From reading this through, I would suspect that it was the fuel high pressure pump which had seized. I would remove the injector pipes from it and see if they are both spitting fuel when the engine is turned over by the starter motor.
 
At the risk of being shouted at... if the rings have stuck in the piston grooves or are so rusty they don't make an effective seal with the (rusty?) bores, you may have some success by dribbling some oil into each cylinder before refitting the injectors. That will make a temporary seal so that you may have enough compression to start from cold. If its starts, it should continue to run despite having low compression and warming it up should improve the state of bores and rings - so maybe it'll have enough compression thereafter to start again without sealing with oil.

Rob.
 
Thanks for the comments from the budgie fraternity, back on track.....
Replacing the injectors one at a time showed that there was a compression issue with the 2nd pot.
Whipped the head off, and pot 2 was full of oil, that had leaked through the head gasket. I put diesel and wd40 in to try to unseize the piston. The bores are nice and shiny, no scoring.
Now the injectors have been returned to be serviced - £40-50 per item, and the head is off to be cleaned up professionally with feedback on the flatness of the head and state of the valve and valve stems.
One thing at the back of my mind - what caused this to seize in the first place, I still have not got a good answer.
 
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