Thankfully, there are several more tests you can do to further verify a blown head gasket. ![]() Your Jeep 4.0L Cherokee (or Grand Cherokee, Wrangler) could have a blown head gasket and yet the engine oil doesn't show a trace of having mixed with coolant. Here's why: Although coolant mixing with the engine oil is a common result of a blown head gasket, this doesn't happen in all of the cases. So far so good, but it doesn't exonerate the head gasket yet, go to: HEAD GASKET TEST 2: Coolant Shooting Out Of Open Radiator. As both of these mix, the resulting oil gets thick and turns to an off-white color.ĬASE 2: The color of the oil is its normal color. This in turn causes the head gasket to burn.Ģ.) Since the job of the head gasket is to seal compression/exhaust gases, engine oil and coolant, a burned head gasket won't be able to keep any of them separated.ģ.) This leads to the coolant entering the engine oil pan and mixing with the oil. You can stop here, since no further testing is required.Īs mentioned earlier, the reason the oil looks this way is:ġ.) The engine in your Jeep severely overheated, resulting in the cylinder head warping. This result verifies that the head gasket is blown on your Jeep 4.0L Grand Cherokee (or Wrangler or Cherokee). OK, let's take a look at what the color of the engine oil means:ĬASE 1: The color of the oil is a light tan, like coffee with too much creamer. Next culprit is injector orings possibly then pulling the head. I like to do it in a pail of hot water to make sure it wont leak under heat. I would remove and pressure test the oil cooler first. Coolant into the exhaust, yes, but not into the oil. Engine oil does not go anywhere the egr cooler. OK, to get this show on the road, this is what you need to do:ġ.) The color of the oil, on the dipstick, is the color of coffee with too much cream (a milky white/tan color).Ģ.) The color of the oil is its normal color. Egr coolers cannot let coolant into the oil. One of the most common symptoms of a blown head gasket is coolant mixing with the engine oil and this first test will check for that. HEAD GASKET TEST 1: Is Engine Oil Mixed With Coolant? The engine oil is thick and tan to off-white color.2.) You know it's not a lack of fuel, because you have verified that the fuel pump is delivering fuel to the fuel injectors. The Jeep won't start: 1.) You have already verified it's not an ignition system problem because you have spark coming out at all of the spark plug wires.White smoke is coming out of the tail-pipe and it smells like anti-freeze being cooked.The most common symptoms a blown head gasket are: The most common cause of a blown head gasket is that the engine overheated due to: 1) A bad radiator fan or fan clutch 2) No coolant in the engine due to a leak somewhere in the coolant system 3) Bad thermostat. You can find this tutorial in Spanish here: Cómo Probar Un Empaque De Cabeza Quemado (4.0L Jeep) (at: ). HEAD GASKET TEST 4: Using A Chemical Block Tester (Combustion Leak Tester).HEAD GASKET TEST 2: Coolant Shooting Out Of Open Radiator.HEAD GASKET TEST 1: Is Engine Oil Mixed With Coolant?.
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