Key said:

Bit of an update but not getting anywhere.
To recap..
Had head skimmed and valves reseated by engine rebuilders,
Got another set of cylinder head bolts and another head gasket
Checked cam/valve timing and bang on
All valve clearances adjusted to 0.20mm using 1-8 4-5 etc
Head tightened correctly using 40nm, 60 degree's, 60 degree's, then 20 degrees on centre bolts with correct sequence.
Did another compression test through glow plug hole without manifolds or rocker cover on but with injectors and new seals clamped down and got the following results :
200,210,220,210
Now at least they are within the tolerances of each other but still way off.
My assumptions :
Has to be something that controls all four pistons as too much of a coincidence for piston rings to be worn that much at the same rate or had to be cracked internally across all four cylinders
Unless anyone can come up with a eureka moment I think a leak down test is the next move although can't find anyone at the moment who is mobile.
Saved this thing from the scrappers as it ran well but doesn't even do that now

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Key said:

Got gasket from other local supplier for £10 more but was the same anyway. Motor was running well before hand apart from oil leek from head gasket and tapping noise when warm and under load. Was pulling well in third up some steep hills before overhaul so wish had left alone now but I like things to be right.

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Key said:

Just new gasket, valve guide seals and good clean up. Nothing major

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Key said:

Already done that yesterday, took timing cover off and timing was spot on, flywheel mark locked in, woodruff key on crank at 12 o'clock and cam mark perfectly lined up with Mark on casing. Plus pump pin slides all the way in.

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