Manifolds, Cylinder Head & Valves

1.DESCRIPTION

1a.MANIFOLDS

Manifolds are used in various designs depending on engine type and application. Inspect manifold for tight sealing, whenever the engine is overhauled. Two manifolds are used on diesel engines. The intake manifold being bolted to left side of the cylinder head and the exhaust manifold being bolted to the right hand side.

The exhaust manifold for 3 & 4 cylinder Tier IV < 50 Hp engines is same for all models.

1b.CYLINDER HEAD AND VALVES

The cylinder head is cast in one piece and houses the intake and exhaust valves. Valve guides are press-fit. Valves are operated by rocker arms shaft mounted on the cylinder head. Lubrication for the valve operating mechanism is provided through rifle drilled passages in the crankcase and cylinder head.

The valve rocker arm shaft assembly, thermostat housing inlet & exhaust manifolds are fitted on the cylinder head.

The crankcase filler cap, mounted on front cover, also serves as a breather to the cylinder head. The breather cap outlet is connected back to intake manifold through PCV valve.

2.MANIFOLDS

2a.REMOVAL : i)Intake & Exhaust Manifold Removal : a)Drain and remove the power steering reservoir. b)Remove the fuel filter (2-1). c)Remove the injector lines (1-1). d)Remove the manifold bolts & lift it off. e)Exhaust manifold can be removed by removing the four bolts (1-2).

NOTE: In overall Engine Section, 3 cylinder pictures shown.