ALL VALVE GUIDES ARE EACH
(UNLESS STATED)

 ENGINE EXHAUST VALVE GUIDE GUIDES  

NISSAN UD 4A9503 13211-97007 PE6  CK30 CW30 CV41 CW41  CK40




In most types of reciprocating engines, a valve guide is provided for each poppet valve in the cylinder head. Along with the valve spring, it serves to positively locate the valve so that it may make proper contact with the valve seat. A valve guide is a tube-shaped piece of metal, pressed into the cylinder head, with the valve reciprocating inside it. Guides serve also to conduct heat from the combustion process out from the exhaust valve and into the cylinder head where it may be taken up by the cooling system. Bronze is commonly used, as is steel; a balance between stiffness and wear on the valve is essential to achieve a useful service life.