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There's not much sign of burning/excess heat that I can see and if just that one big end bearing is responsible for your engine seizure you may be very lucky with that crank journal remaining within spec and being able to be simply polished up.
But a lot depends on the history of this engine.
Has it had any recent work that could be connected with the failure of this particular bearing?
If it hasn't and it's a high mileage engine then I reckon a full strip down and measuring/overhaul would still be the best route.
It has about 370,000 km on it. It has never been rebuilt.
If this is for the BJ42 it might be worth buying a tested engine.http://www.gscruiserparts.com/Parts_Vehicles.php
If my engine died in my Bj60 I would probably rebuild it totally with a nickel head etc.
So did you confirm anything? Just a thought the engine is disengaged from the transmission eh? Clutch is working? You can push the truck back and forth? Try putting the t-case in neutral?
If a safety switch failed on the clutch, if you had one, it would not turn over as the starter would not be getting power. Putting a bar on engine to see if turns over with the transmission engaged might not be able to be turn over with a parking brake set. It would appear seized.. just a thought.
https://forum.ih8mud.com/attachments/oilcircuitbengine-jpg.274434/
so, to be clear, you are confident that flushing the oil system using a squirt gun is adequate to clean the system of all debris. confident enough that you are recommending this procedure, to both your customers and those reading the thread, that longevity will be restored to the repaired engine?