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Discussion Starter · #1 ·
Hello, I’m new here and new to the mechanical cat world, I have a 1992 Peterbilt 379 with a 4MG b model cat with 110k on rebuild. It’s building pressure in the coolant but not loosing any non in oil or fuel. The only coolant it looses is out the overflow tank. It does it from the start and doesn’t change as it heats up runs fine not much Hp just factory.
 
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