ALL VALVE GUIDES ARE EACH
(UNLESS STATED)

Make	Engine	Model
Nissan-UD	PD6	TFA21
	PD6 Turbo	CK40
		CV41
		CW40
		CW41
	PE6	CK30
		CKA45
		CV30
		CV32
		RB30 bus
		RB31 bus
	PE6 Turbo	CGA45
		CGA46
		CKA45CT
		CKA46
		CWA45
		CWA46
		CWA46

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.