ALL VALVE GUIDES ARE EACH
(UNLESS STATED)

ENGINE INLET VALVE GUIDE GUIDES  NISSAN UD

13212-97001 RD8 TW50 CW50 CW51 TZA52 10/1976- FROM ENGINE # 050000


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.