Ok some background, by missus' boss snapped his timing belt on the M6 last month, i diagnosed it and told him to take it somewhere to get sorted. The garage he went to came back with a quote of 4 grand to fix it, so i told him to bring me the engine and i'd sort it for him for sensible money.
When the motor arrived there was heavy damage to all four pistons, so i picked up a spare set of BAM pistons/rods and ordered all the parts to get it sorted.
Sent the head off to have it repaired, and it arrived back on wednesday, so i've started on the motor today.
Removed the olde pistons and honed up the bores, but i've discovered that all four big end bearings are marked/worn.
I thaught that was pretty unusual, so i pulled number four main bearing cap to inspect the bearing, and sure enough its marked as well.
I took some photos:
Any ideas whats going on here?
The motor is sludge free.