Broken chain, What would cause this?

[Handyman Dan]

I tore this engine down to find this problem, a broken silent shaft chain and the crankshaft sprocket B damaged. Dose anyone have any ideas of what could have caused this to happen? The timming chain and guides have been recently changed with new parts.

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[Handyman Dan]

Here is some results of running the engine with no oil pressure.

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[Handyman Dan]

This is where most of these heads crack. Clyinders #2 and #3

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[Handyman Dan]

Here is yet another cracked manifold. It dose not appear to be leaking yet.
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[skarp]

:israel:I know what caused this, old age?