The OP said the engine had crap in the sump - possibly bearings and if he looks closer will possibly have a cracked or broken crank.
Not likely to be a result of cracked coolant system coolant outlet - yes the bearings could over heat but engine would most likely sieze first - with associated alarms on the dash.
If the oil pump housing had failed, this kills the heads/valves etc and has no impact on the bottom end - oil pressure still remains for a while at least long enough for the valves to crash with pistons and kill the engine from the top end.
Too me it is a crank/bigend issue - though the oil filter could have been fitted incorrectly and starved the engine - on the evidence presented definitely not a split coolant housing or a cracked timing belt mount on the oil pump.
Garry
REMLR 243
2007 Range Rover Sport TDV6
1977 FC 101
1976 Jaguar XJ12C
1973 Haflinger AP700
1971 Jaguar V12 E-Type Series 3 Roadster
1957 Series 1 88"
1957 Series 1 88" Station Wagon
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