you prob find yours as gone same way as this one did its common issue with them and number 1 or 2 ie gearbox end is number 1 on these engines,, i would only ever fit all new piston rings and conrod bolts as they are stretch bolts, also big end bearings as well and timing chain kit etc,, link below is what i used on this car as its my own car and trust the seller had a lot of stuff off them and always worked out well,, you must also hone the bores as shiny bores are part of the issues also do away with factory piston rings sets they are rubbish been seeing b-series bmw engines with eating oil issues due to coated plastic rings,, will list all parts i used below anything under this level wont end well to be honest,, it right fiorst time mine has done 2000 miles now used 1/4 litre of oil is running 230 bhp at crank 206bhp at wheels i drive 3000 revs and above most of time as they dont like low revs its glaze's the bores etc,,
ALSO MUST DO VALVE STEM SEALS AND CLEAN OUT INLET VALVES PORTS ETC,
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big end bearing
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chain kit head gasket head bolts and valve stem seals,
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valve spring compressor,,,THIS IS BEST TOOL FOR THESE HEADS GOOD CONTROL AS COLLETS ARE TINY, USE VASLINE AND DENTIST SCRAP TOOL TO INSTALL THEM AND MAGNET TO REMOVE THEM, I HAVE GOT 3 KINDS OF VALVE SPRING TOOL AND THIS CHEAPY ONE IS BY FAR THE BEST,,,
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brake cleaner to clean things and to clean head and block surface just before throwing head back on MUST BE OIL FREE CLEAN, alsio use scotchbrite
below link cheap hone tool use wd40 when degalze the bores ,, these engines take fast drill 3 minutes each then 2 minutes very slow as to get 45 degrees lines up the bores for best results,,
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the conrods bolts and camshaft bolts are main dealer only,, always use loctight on conrods bolts,,
all pistons and end caps MUST BE NUMBER AND DIRECTION MARKED CANNOT USE A END CAP OFF ANOTHER ROD ETC,, THIS IS IMPORTANT FAIL HERE AND WILL SEE A ROD OUT SIDE OF BLOCK,, AFTER REBUILD FIRST START LEAVE CAR ON IDLE FOR A GOOD HOUR LET THINGS SETTLE IN,, some pic below of my latest victim a fiat abarth this had 30,000 miles driven by old lady never rev it much glazed the bores and stem seals went hard burning oil badly,, not just mini engines
i also put grease on valve stem seals and valves when putting back together prevents the rubber seals getting hurt form being
dry on first start up