![]() ![]() When this happens, oil begins to push its way into the cooling system and starts to create a milkshake like liquid mixed of oil and water. ![]() Unfortunately like the walls of the EGR cooler, this metal is thin and begins to break down over time. The engine coolant is cooler than the oil allowing it to cool the oil down during this process. Think about the bread being hollow and allowing the oil to pass through it from one side to the other and the meat, also hollow, being the engine coolant. The best way to describe a 6.0 oil cooler is thinking about it like a sandwich with only bread and meat stacked on top of each other multiple times. This is probably the most common cause for blown head gaskets in the 6.0 engine. As for head gaskets we typically see this issue arise from 3 different things. What we normally find in these engines Is worn rings (common on higher mileage trucks), some lifter failure, and bad bearings (typically caused from lack of maintenance aka not changing your oil regularly). The bottom end is fairly stout, and we typically don’t see catastrophic failure in these trucks until the 350k+ mark. Let me start by saying the 6.0 motor is actually a well-built motor. This reduced coolant flow leads to five issues.The notorious failure with the 6.0 engine is one that we see very often. With time and miles, whether you’re towing heavy or just cruising, any debris or solids that you have suspended in your coolant can become trapped and will slowly and eventually restrict the coolant flowing through the oil cooler. These pathways are smaller than the oil pathways and allow for cold coolant to take the heat away from the adjacent oil pathways. This will result in filling your cooling system with oil which becomes a thick Vaseline-like emulsion which can be very difficult to remove. When one of the layers separating the oil and coolant fails, it will allow higher pressure oil to flood into and mix with the lower pressure engine coolant.While this oil cooler is effective when it’s fully operational, there are two critical failures that can occur: The hot oil comes in from the engine flow through the oil channels adjacent to the cold coolant and flows out and goes through the rest of the engine. ![]() The cold coolant flows in, then flows through the adjacent channels and exits out of the hot coolant side into the EGR cooler. It’s important to note that the two fluids are never intended to mix together! That’s bad news for the six-liter diesel. There are alternating smaller pathways that the coolant flows through. While hard to access or service, it has a pretty simple design–it’s called the stack plate heat exchanger. There are large pathways that the oil flows through. It’s hidden underneath the oil filter in the valley of the engine. On top of the engine, underneath the intake manifold. To better understand the problems with the original equipment (OE) engine oil cooler, we have to understand how it works.įirst of all, it is located directly beneath your engine oil filter. This is typically an indicator that you have a clogged engine oil cooler and can be putting vital engine components at risk. Does your 6.0L have a coolant and oil temperature spread exceeding the Ford specified 15✯? ![]()
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