Once all this air is stuffed into a tiny combustion chamber, pressures are already extremely high putting lots of stress on the head gasket. The more the air is compressed by the piston, the hotter it will get so most diesel engines have compression ratios at least about 15:1 but sometimes upwards of 20:1! On top of these high compression ratios, many diesel motors have turbo charges adding even more pressure.
The one thing every diesel engine does to help heat up the intake air charge is to have a relatively high compression ratio. To make sure the air charge is heated enough to run, some diesel vehicles will utilize glow plugs or intake air heaters during startup or cold weather. On the other hand, a diesel engine operates because the intake air charge is so hot that when the fuel is injected into the cylinder it combusts due to the high heat so no spark is needed. If they get too high, the fuel/air mixture ignites on its own, called knocking and can cause damage to the head gasket. A gasoline engine relies on a spark to ignite the fuel-air mixture so the pressures and temperatures are limited. Diesel engines also have higher combustion pressures during normal operation so a diesel engine head gasket leads a much more difficult life. Diesel head gasket repair also often has to be done specifically at a specialty diesel engine shop or dealership which can charge higher labor rates which also will add to the cost and complexity of the job.ĭiesel engines can blow a head gasket just like a gasoline engine. Diesel head gasket repair can also be more complicated that other head gasket repairs due to the complexity of a diesel engine and the extra work involved in the repair. Diesel engines can be more prone to head gasket failure than other types of engines.
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