Land Rover Lesson 2 Auto Trans Coolingine Rover Manual

							Engine Ladder Frame Assembly
69.8 mm minimumA
Engine bulkhead housing1
Crankshaft main bearing cap adjustment screw2
The ladder frame is fitted to the lower cylinder block,
via 20 bolts and 2 studs and nuts, to stiffen the base
structure thus helping to reduce Noise, Vibration and
Harshness (NVH). The frame is made of high-pressure
die cast aluminium.
Located in the bulkhead housing are eight crankshaft
main bearing cap adjustment screws.
A gasket seals the joint between the bulkhead housing
and the cylinder block.
A port for the oil level gauge tube is included in the
casting on the LH side of the cylinder block.
Sump
Sump1
The pressed steel sump is a wet-type, sealed to the ladder
frame using a gasket and 10 bolts.
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							Oil Pick-upOil pick-up1
The oil pick-up is a two-piece unit with strainer located
in the centre of the sump oil well, as a source for the
supply of engine lubrication oil to the oil pump. Oil is
drawn though the end of the pick-up and strained to
prevent solid matter from entering the oil pump.
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							CAMSHAFT TIMING COMPONENTS
Front of engineALH camshaft drive assembly1
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							RH camshaft drive assembly2
Spacer3
Jackshaft sprocket4
Chain guide5
Jackshaft chain tensioner6
Tensioner pin7
Jackshaft chain8
Camshaft Drive Assembly
Each camshaft drive assembly comprises:
•A jackshaft gear
•A camshaft gear
•A drive chain
•A chain guide
The LH drive assembly is driven from the front of the
jackshaft and the RH assembly from the rear.
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							CYLINDER HEAD COMPONENTS
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							Hose, crankcase emissions, RH camshaft cover
to intake manifold
1
Fuel injector pulse damper2
RH Fuel rail3
LH injectors (3 of)4
Fuel supply line5
Schrader valve6
RH injectors (3 of)7
Hose, crankcase emissions, LH camshaft cover
to intake manifold
8
Electrically heated positive crankcase ventilation
valve
9
Camshaft position (CMP) sensor10
Oil filler cap11
LH camshaft cover12
LH valve rocker arm oil supply tube13
LH camshaft bearing caps14
LH camshaft15
Valve rocker arm16
Collet17
Valve spring retainer seat18
Hydraulic lash adjuster19
Valve spring20
Valve stem seal21
LH cylinder head22
LH exhaust manifold gasket23
Valves24
Cylinder head gasket25
Volume reduction plug/valves26
Timing chain tensioner27
RH exhaust manifold gasket28
Timing chain tensioner29
RH cylinder head30
RH camshaft31
RH camshaft bearing caps32
RH valve rocker arm oil supply tube33
RH camshaft cover34
Crankcase ventilation valve35
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							Cylinder Heads
RH cylinder head1LH cylinder head2
The cross-flow cylinder heads are based on a twin valve,
central spark plug combustion chamber, with the inlet
ports designed to induce swirl and control the speed of
the induction charge. This serves to improve combustion
and hence fuel economy, performance and exhaust
emissions.
LH and RH cylinder heads are identical castings.
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							Camshafts
Bearing cap1Camshaft2
A single camshaft on each cylinder bank is retained by
a camshaft carrier, line bored with the cylinder head.
The camshafts are located by a flange, which also
controls end-float.
The LH camshaft incorporates a reluctor, which is used
in conjunction with the Camshaft Position (CMP) sensor
to measure engine position.
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							Valves and Hydraulic Lash Adjusters
Valve stem seal1
Valve spring2
Valve spring retainer seat3
Valve spring retainer key4
Rocker arm5
Hydraulic lash adjuster6
Valve7
The valve springs are made from spring steel and are
of the parallel single-coil type. The bottom end of each
spring rests on the flange of a spring retainer, which has
an integral valve stem seal. The top end of the spring is
held in place by a spring retainer, which is held in
position at the top end of the valve stem by split taper
collets. The taper collets have grooves on the internal
bore that locate to grooves ground into the upper stems
of the valves.
Valve seats and valve guides are an interference fit in
the cylinder head.
The valves are operated through roller-type finger
rockers and hydraulic lash adjusters, actuated by the
camshaft lobes. When the camshaft lobe presses down
on the top of a finger rocker, roller mechanism, the
respective valve is forced down, opening the affected
inlet or exhaust valve. The use of this type of actuation
method helps reduce friction in the valve timing
mechanism.
The body of the hydraulic lash adjusters contains a
plunger and two chambers for oil feed and pressurised
oil. The pressurised oil is supplied to the lash adjusters
via the main oil galleries in the cylinder head and
through a hole in the side of the lash adjuster body. The
oil passes into a feed chamber in the lash adjuster and
then through to a separate pressure chamber via a one
way ball valve.
Oil flow from the pressure chamber is determined by
the amount of clearance between the lash adjuster outer
body and the centre plunger. Oil escapes up the side of
the plunger every time the lash adjuster is operated, the
downward pressure on the plunger forcing a
corresponding amount of oil in the lash adjuster body
to be displaced. When the downward pressure from the
camshaft and finger rocker is removed (i.e. after the
trailing flank of the camshaft lobe has passed), oil
pressure forces the lash adjusters plunger up again. This
pressure is not sufficient to effect the valve operation,
but eliminates the clearance between the finger rocker
and top of the valve stem.
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							Valve Rocker Arm Oil Supply Tube
Valve rocker arm oil supply tube1
The valve rocker arm oil supply tube locates on top of
each camshaft and is secured by two bolts to the front
and rear camshaft bearing caps. Oil is supplied to the
tube via a gallery in the cylinder head and is distributed
to each rocker arm through adjacent spray holes in the
tube.
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