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What Is A Head Gasket? 

In the case of engine with detachable cylinder heads, the join between the two machined surfaces has to be make both water-and gas pressure-tight, by means of special gasket.

In this article the gasket problems are discussed. They cover the effects of various leaking gaskets.

Reasons and effects of blown head gasket :

The trouble most usually experienced after a top-overhaul is the failure of the cylinder head gasket. Often insufficiency care is taken in fitting the gasket and in tightening down the cylinder-head nuts. A faulty gasket may cause nothing more serious than loss of compression: leakage may be evident at the edge. of the gasket or at a cylinder-head stud or bolt. If it occurs at the narrow section of gasket between two cylinders it is more difficult to trace out.

If the leakage occurs into one of the water passages, however, coolant can enter the cylinder with disastrous results if a hydraulic lock in such circumstances an attempt to start the engine after the car has been standing for sometime can result in a broken piston or a bent piston connecting rod. If the water seeps down past the piston rings into the oil pan it will causes slugging and, if I contains anti freezing compound, serious gumming and extensive damage.

Blown head gasket:

Any missing or unequal cylinder compression will invariably point to valve or gasket trouble. A blown head gasket can cause a wide range of problems, overheating missing , coolant or oil leakage, engine smoking, even head or block damage ( burned mating surfaces). Quite often a blown head gasket will show up during a compression test. Two adjacent cylinders usually, the two center ones will have low pressure.

A leaking intake manifold gasket can cause a vacuum leak, with resulting rough idle. To check for an intake gasket leak, squirt oil along the edge of gasket. The oil may temporarily seal the leak, showing and intake gasket rupture. A low vacuum gauge reading can also indicate an intake leak.

Common signs of a blown head gasket are oil residue in radiator and on radiator cap, also gray milkshake texture motor oil, which has been contaminated with coolant.

A leaking exhaust manifold gasket will show up as a cricking type sound. As combustion gasses blow into the manifold and out the bad gasket, an almost metallic-like rap is produced.


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Blown Head Gasket Causes and Diagnostics