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Originally Posted by marinabrian
My thoughts as to what happened to this engine..........
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The crank pulley was removed and installed with a rattle gun, and this has disturbed the lower timing chain guide, leading to the timing being lost shortly afterwards.
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When the valves came into contact with the pistons, this is when the rockers were damaged.
When the head is removed all will become apparent 
This particular engine, and by that I mean the M47R, has three different thicknesses of head gasket, according to tolerances, including head skims, and the pistons actually protrude through the gasket fire rings, and the clearance to the valves is minimal.
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I look forward to the next part of the strip down.
Brian 
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Brian.
I will be carrying on with the strip down later today after real life projects have been sorted out,
now we know that using a rattle gun is not recommended but always use the right tool.
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