Engine blow by

[Waterloo]

(08-11-2019 )Khalid4747 Wrote:  So you're saying the water that's in the oil could be coming from the coolant reservoir and be leaking into the oil pan? How can you tell if there is a problem with the head gasket or cylinder liner?

Also a side note, there are no check engine lights and oil pressure is fine.

The liner is the tube the piston goes up and down in. The liners, there are 6 of them, sit on a tiny ledge inside of the block. If the motor is run at a low rpm under stressful conditions, like lugging up a mountain, the internal forces inside the motor will dislodge the liner(s). When the liner dislodges, the water from the cooling side of the block will work its way into the motor oil as that seal is broken.

Also, when the liner dislodges itself from the block, the top of the liner, which protrudes out of the top of the block, will score the bottom of the head. When the head is scored, it will need to be replaced, along with the head gasket. A complete in frame is what is called for at this point. The motor will need to be torn down, and those ledges that the liners sit on will need to be machined. There is a special tool to do just that. Sadly, most shops do not do this crucial step, and just drop the new liners back in. You now have a 100,000 mile motor, as it will soon fail again and another in frame will be required. Been there and done that.

To test... Drain and remove the oil pan. Pressurize the coolant system to around 25 psi, let sit overnight if possible. The following day, someone will need to be under the motor with a good flashlight, while a second person bars the motor over at the air compressor. You are looking for water on the piston liners. It will show up as droplets, clear droplets. Normally it is the #5 and or #6 liner that fails. But you need to inspect all of them. If you are in a quiet area while barring the motor, if there is a coolant protrusion issue, you may hear the coolant bubbling up top while under the motor, If you hear that, a liner more than likely has been dislodged, or fretted. Continue barring motor until you see coolant in liner(s).

If you see coolant, it is in frame time. If this is the case, call Mr Hagg and make an appointment. He will rebuild the motor to better than OEM.

Good luck.