6D102 6BT5.9 Used Engine Heads For Excavator PC200 - 6 PC200 - 7 3966454

Specification Of Used Engine Heads

Description

Cylinder Head Valves
In an engine, valves close and open to let in or block the entry of air and fuel into the combustion chamber. Each cylinder in an internal combustion engine has two valves- the intake valve, which is usually bigger and a smaller exhaust valve.

Several components hold and control the working of cylinder head valves. The parts are explained next.

Valve spring- the valve spring helps keep the valve shut. Depending on the design, a valve spring may comprise one or two different springs, sometimes even three. The triple spring construction is mostly found on performance engines where a high level of reliability is required.

Valve spring retainer- as its name suggests, the spring retainer is the part that helps to maintain the spring position. It mounts on the spring’s top end. The valve spring retainer is usually made from steel.

Retainer lock- the retainer lock is the part that lies between the spring retainer and the tip of the valve. The pressure or force exerted by the spring helps to hold the lock in place and the components intact.

Valve seal- mounted on the valve stem, and just under the spring, the valve seal prevents cylinder head leaks. It keeps oil from getting into the intake and exhaust passageways and ensures the proper working of these cylinder head parts.

Valve guide- the valve guide simply guides the valve. Valve guides are the metal pieces, usually iron or bronze, that position and allow for free movement of valves. The guides are usually removable parts, pressed into the cylinder head during installation. This makes replacing them during cylinder head refurbishment easy.

Valve seat- this part provides a seat that the valve makes contact with to form a seal. Together with the valve, the cylinder head valve seat prevents combustion gasses from escaping until the valve opens. Seat valves are made from hardened iron alloy and forcefully driven into the cylinder head to create an airtight seam.

Spring seat- some cylinder heads contain a spring seat. The spring seat is usually placed between the spring and the surface of the cylinder head. It protects the head from being damaged by the spring as it compresses and expands. These parts are often found on aluminum heads.

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