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Teknikimobil.com-Teknisimobil will again discuss cooling system problems that occur in car engines, one of which is cooling system leaks.
The cooling system is often overlooked. When a customer spends a lot of money to repair his engine, he will not get a complete repair if the cooling system is not in good condition. Radiators are often clogged with rust. If the radiator cannot deliver enough heat to the surrounding air, the engine will overheat at high speeds.
Water jackets sometimes develop minerals and water scale over a long period of time. If the engine is removed from the car for repair, the cylinder block will probably be treated (cleaned) in an oven. This treatment will use acid to clean the water scale inside the cylinder block.
The first cooling system problem is internal and external cooling system leaks.
Hot steam from the exhaust pipe is a normal condition in the morning. Residual coolant from the exhaust pipe can be caused by a crack in the combustion chamber. Or a leak that occurs in the cylinder head gasket.
Cooling system problems related to internal leaks can occur in the following places.
- In the coolant passageway in the intake manifold on most V-type engines.
- In a channel on the cylinder head.
- The combustion roar area such as the cylinder head gasket.
- On cracks in the cylinder head or even in the cylinder block.
Damaged cylinder head gasket can result in internal leaks©Glencoyne
When coolant has leaked into the combustion chamber, this can be easily identified during engine disassembly. A small amount of carbon in the combustion chamber is normal. A cylinder with a leak will not have much carbon in it. Internal leaks can be diagnosed using a block tester, pressure tester, or infrared analyzer.
Cracks or leaks in the cylinder head gasket cause the coolant to leak and will clean the carbon on the piston and combustion chamber in question ©Gilles
Oil contamination is included in cooling system problems.
Coolant leaks into the crankshaft chamber will contaminate the oil. This is called cross fluid contamination. This condition will be very visible when we open the valve cover.
Mixing coolant with engine oil©honda-tech
When there is a crack or leak in the cylinder head gasket, sometimes coolant pressure can leak when the engine is stopped, into the cylinder, resulting in hydrolock. This occurs when the valves are closed, and the engine cannot reach full rotation. If the spark plugs are removed, the engine will be able to reach full rotation with coolant coming out of the spark plug hole.
When a leak occurs, the oil and coolant mix. Pressurized oil, around 30 psi, will force its way into the coolant system which has a lower pressure. Coolant pressure is usually only around 15 psi. The engine will overheat and will spew a mixture of oil and water from the radiator drain hose.
When the cylinder head gasket is damaged, mixing occurs through the two holes (in the picture) between oil and coolant©Gilles Mixture oil and coolant due to damaged cylinder head gaskets on the radiator©2carpros
For OHC type engines, there is a gap for the camshaft. Because oil collects through this area, this area should become cracked. Oil will push into the cooling system when the engine is cold.
Also read:
Easy Steps to Change Mitsubishi Pajero Engine Oil
How to Change Honda Jazz Engine Oil and Oil Filter
How to Change Honda CR-V Engine Oil and Oil Filter
Fluid contamination can also occur when there is an automatic transmission coolant leak. The transmission will be filled with coolant when the engine is off. And ATF will leak into the coolant when the engine is operating.[]