2011 Navistar International DuraStar DT570 engine.

[edgart]

Good day, Friends.

I’m troubleshooting a 2011 Navistar International DuraStar DT570 engine.

About a year ago we performed an in-frame overhaul (All parts and labor for the in-frame overhaul were supplied and performed by the authorized Navistar dealership/service center.)

-replaced the cylinder head,
-installed new pistons and cylinder liners,
-resurfaced the block deck,
-and fitted new gasket sets, among other items.

After the overhaul the truck sat in a yard for seven months without being run.
When we tried to start it one morning, the engine fired, produced a loud bang, and shut off; it has not started since.

Upon teardown we found:
-one cylinder liner shattered,
-liner debris that damaged the cylinder head and the affected piston,
-coolant mixed with the engine oil,
- a fragment of piston ring in the oil pan.

Question:
Could this failure be due to a factory-defective liner, or where would you focus the diagnosis?