05-02-2016 12:04 PM
You are probably going to find a failed head gasket, in which the fire ring of the gasket has failed. Take note of which cylinder the gasket failed on. When gaskets fail and allow combustion gas to escape, the gas at extremely high temperature and very high velocity erodes the adjacent areas of the cylinder head. The damage will be obvious and not hard to spot.In most cases the same area of the cylinder block will also be eroded. The repair for the cylinder head is resurfacing after a pressure test, 3306 heads don't crack very often, valve head recession/protrusion will need to be checked after skimming.The repair for the block involves removing the pistons and cylinder liners, then machining the liner seat to accept a stainless steel liner seat insert. On a 966G this probably involves removing the engine or blocking up the machine to remove the rear axle, for access to the oil pan, connecting rods and pistons. Checking cylinder liner protrusion after a gasket failure is unreliable because the tooling will not reveal the short area of erosion.
04-02-2016 11:46 PM
Working on a 3306 turbo/ aftercooled eng. Building pressure in radiator popping relief on cap.overflow.
Put a pressure tester on radiator and let it build up to 20psi. Shut down engine and let it sit for 4 hrs. Pressure dropped about 3 lbs in that time. Head gasket was replaced approx.2000 hrs ago. It takes about 10 min. of running of eng. To build up to 15 lbs of pressure. Any suggestions as to what is possibly causing this?
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