Head Gasket

Head Gasket from MATTO in Taiwan


WEIANN / MATTO supplies cylinder head gasket for all conventional passenger cars, trucks, forklifts, commercial vehicles, construction vehicles, heavy duty and machine engines. Increasing torque and performance with decreasing consumption and emission. The development goals in engine construction determine the requirements of modern gasket systems. As a head gasket leader in technology, an original equipment manufacturer transfers all of his expertise, experience and quality into the replacement parts business with a broad head gasket product palette.


Head Gasket

Head gasket sits between the engine block and cylinder heads, which is the most critical sealing application in any engine. Usually, an internal combustion engine uses water-cooled four-stroke gasoline design. The three circuits of working fluids which are combustible air/fuel mixture, water based coolant with glycol mixed and motor oil for lubrication are all vital. However, any combination between them will cause engine overheat, oil burning or coolant burning. 


A series of problems can occur when gasket fails:

1. Compression loss – Leading to power reduction, or an engine rough idle.


2. Exhaust gases being forced into the cooling system – Causes engine overheating and increases engine wear

    since the motor oil mixed with antifreeze.


3. Coolant leak into cylinders (Internal leak) – Exhaust to issue steam and catalytic converter will damage.

    Besides, a large number of coolant leaks into cylinders may occur hydrostatic lock issue, which will

    cause extensive engine damage.


4. External leak – Oil and coolant accumulate underneath the engine.


5. Compression leaks into small spaces between the gasket – When the engine turns off, the trapped air

    will then escape into the coolant and creates air pockets. If the air pockets are trapped in the engine’s

    coolant thermostat, it will cause further overheating, more voids will be created between gasket and

    engine.
  

All of the situations may happen if the head gasket fail. The engine may act normally even excessive steam erupting from the tailpipe, until all of the coolant is gone and the engine overheats.


There are several types of head gasket:

1. Multiple Layers Steel (MLS) – This is the most popular gasket that modern engines used. It typically

    consist three layers of steel: top layer with rubber-like coating, contact layer with wave-stopper and

    bottom layer with full coating (interior) and partial coating (exterior).


2. Solid Copper – The copper gaskets are extremely durable. However, it typically requires special

    machining named o-ringing  to place a piece of wire around the circumference of cylinder to bite

    into copper.


3. Composite – An older type of gasket made from asbestos or graphite. Due to health concern, the

    utilization rate of this type is getting lower and lower.


4. Elastomeric – This gasket type usually can be found in Rover Group K Series engines. The design was

    very successful to produce a production version of the technology used in F1 engines. However, there

    were persistent problems on the design - the joint interface became unstable and the gasket could not cope.


 The condition of a head gasket can be investigated by checking the compression pressure with a pressure gauge or a leak-down test. Meanwhile, keep an eye when white smoke and blue smoke coming out from the exhaust pipe. It is a warning that the head gasket should be replaced. The cost of replacement gasket is usually not expensive but is very time-consuming. As a result, the labor cost of replacing head gasket is around 75%. Furthermore, untreated blown gaskets significantly cause serious damage on the engine and requiring more expensive work. Therefore, replace these spare parts regularly is strongly recommended.