Have you ever wondered what that cylinder head looked like inside? We cut one in half to take a look.
The problem that many people have is that diesel fuel gets into the coolant. This happens when a crack appears in the thin wall just above the injector cup.
In the picture, you can see how thin it is between where the injector goes and the water jacket on the right side.
It's an internal crack so it's very difficult for a machine shop to diagnose and doesn't always leak until the crack opens up when the head gets hot.
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