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1. JEEP CHEROKEE COOLANT LEAKING FROM WATER PUMP CRACKED
2. JEEP CHEROKEE COOLANT LEAKING FROM WATER PUMP CRACK

By this point, air pockets will have formed in the upper portions of the cooling system, including the water pump, which will be suffering from cavitation-the primary cause of the temperature swings. Moreover, lower levels of coolant make the cooling system itself less effective, and as this spirals out of control you'll see more frequent and more severe swings of the temp gauge. As the loss of coolant becomes greater, the remaining coolant must do the job of the entire system. Over time, the cumulative loss of coolant will manifest itself at first as an occasional excursion of the temp gauge needle into high territory. With a blown head gasket, you are losing coolant continuously even if this occurs very slowly. When white smoke comes from your exhaust, it's usually in conjunction with overheating. Additional factors that may encourage preignition and detonation include a clogged fuel injector, a failing fuel pump, clogged fuel filter, and a low coolant level. These can include towing in steep terrain and/or in hot weather, using low-quality fuel, having the ignition timing too far advanced (manually or via programming), and having an older engine with ring wear that allows oil blow-by to contaminate the air/fuel charge. These spikes in pressure result in damage when a set of factors converge. Blown gaskets and cracks can result when preignition occurs in the combustion chamber.

JEEP CHEROKEE COOLANT LEAKING FROM WATER PUMP CRACKED

In a few cases, white smoke in the exhaust can indicate a cracked cylinder head, as is well-documented in 3-liter Ford Vulcan V-6s and late-model Chrysler Magnum V-8s their thin, flexible cylinder heads can easily be pushed beyond the limit by low fuel octane, but this can happen to any engine. When we say most cases, we want to be clear that we're talking about normal driving with an unmodified car or truck, not a souped-up hot rod. In most normal cases, a blown head gasket is caused by low- octane fuel in conjunction with some aggravating factor. If you find white smoke pouring from your exhaust, you'll probably want to know why, so that your head gasket problem won't recur. We told you so! As a bonus, you'll also be blessed with a profusion of exhaust bubbles in your coolant overflow reservoir. Disclaimer: Do not remove your radiator cap while the engine is hot. It will also take on the smell of combustion, which is not normal for healthy coolant. You'll be able to spot the oily foam around the cap's seal and the radiator cap's neck, as seen in the photo above (this is not a St. This can easily be seen by removing the radiator cap. As you accumulate more miles on your engine with a blown head gasket, the coolant escapes through the exhaust, and cooling system volume is replaced with a miasma of oil foam and exhaust byproducts. This is because the high pressure of combustion introduces exhaust gas and nearby boundary-layer lubrication into the cooling circuit. White smoke from your exhaust almost always indicates a blown head gasket, and just like there is coolant mixed with your engine oil, there will also be engine oil mixed with your coolant. It will be up to you and/or your mechanic to not just perform the head gasket repair, but to do the necessary forensic diligence to fix it for good! 004 inch) between the aluminum cylinder head, the MLS gasket, and the iron deck surface caused a breach that eventually allowed coolant to enter the cylinder. The subsequent lack of supporting material (a mere. In this photo, the passenger-side head gasket on this 5.7-liter Hemi failed because during a previous repair the dealership used a high-speed abrasive disc to clean an aluminum cylinder head sealing surface designed for an MLS gasket-a big no-no. Replacing the damaged head gasket, while expensive, is only half the battle. Cracked engine blocks are exceedingly rare because the head gasket seal is designed to fail before the block fails, making head gasket failure the predominant mode for white smoke from the exhaust (cracked cylinder heads are slightly more common, and we'll discuss those unique cases later).

JEEP CHEROKEE COOLANT LEAKING FROM WATER PUMP CRACK

There are only two ways that can happen: a crack in the engine (block or cylinder head) or a breach in the head gasket seal. White smoke from the exhaust means there is an opening in the cooling system that exposes coolant to the high pressure and temperature of the combustion process.