Heres the scenario: Gentleman brought us his used 2000 Freightliner, with a C-12 (million miles plus, supposedly inframed at 600,000) He complains that he saw signs of coolant at the blow-by tube. Service manager tells me to pull the pan, pressurize the cooling system and see which liner is leaking. Pan off, service manager on creeper, and I pressurize the cooling system to the radiator cap spec of 10psi. I look down at him to see a puzzled look, so I slide under for a look. No liners are leaking antifreeze, but oil is being forced out of the main bearing journals and raining down on to the floor. We pulled the oil cooler, and cylinder head to testing. Both passed.
Has anyone heard of an internal crack in the block between the main oil galley, and the coolant chambers around the liners?
Another scenario has been posed to us. The air compressor is leaking internally and causing this. I question this, as the air compressor's lube system returns to sump by draining out a hole into the front structure.
Just to cover all bases I am getting ready to pressurize the compressor and listen for air down below.
Has anyone heard of an internal crack in the block between the main oil galley, and the coolant chambers around the liners?
Another scenario has been posed to us. The air compressor is leaking internally and causing this. I question this, as the air compressor's lube system returns to sump by draining out a hole into the front structure.
Just to cover all bases I am getting ready to pressurize the compressor and listen for air down below.