Land Rover Lesson 2 Auto Trans Coolingine Rover Manual

							Crankshaft and Main Bearings
Crankshaft1
Thrust washer2
Thrust washer3
Main bearings - upper4
Six counter-balance weights ensure good vibration levels
from the four throw, five bearing crankshaft.
Manufactured in cast iron, the crankshaft also has
undercut and rolled fillets for improved strength.
The crankshaft rear oil seal is a press fit in the bedplate
to cylinder block interface.
The main bearings are aluminium/tin split plain
bearings. An oil groove in the upper half of each bearing
transfers the oil into the crankshaft for lubrication of
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							the connecting rod bearings. A aluminium/tin thrust
washer is installed each side of the top half of the centre
main bearing.
Bedplate
The bedplate is a structural casting bolted to the bottom
of the cylinder block to retain the crankshaft. The use
of a bedplate further improves rigidity. Iron inserts, cast
into the main bearing supports of the bedplate, minimise
main bearing clearance changes due to heat expansion.
Two hollow dowels align the bedplate with the cylinder
block.
Beads of sealant seal the joint between the bedplate and
the cylinder block.
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							Sump
The aluminium alloy structural sump is bolted to the
bedplate. A windage tray attached to the underside of
the bedplate isolates the oil pan from the disturbed air
produced by the rotation of the crankshaft, to prevent
oil aeration and improve oil drainage. A rubber plug at
the rear of the structural sump seals the port that
provides access to the torque converter securing bolts.
The engine oil drain plug is located at the front right
corner of the oil pan.
A bead of sealant seals the joint between the structural
sump and the bedplate.
Oil Pump
The oil pump is installed on the crankshaft at the front
of the engine. The pump inlet and outlet ports align with
oil passages in the bedplate.
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							Starter Drive Plate
Starter drive plate1Bolt2
The starter drive plate is attached to the rear of the
crankshaft. A timing disc, for the engine speed sensor,
is spot welded to the front face of the drive plate.
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							Timing Disc
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							CAMSHAFT TIMING COMPONENTS
Secondary chain tensioner1Secondary chain2
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							Variable valve timing unit3
Primary chain4
Primary chain tensioner5
Timing Gear
Multiple link primary and single row secondary chains
drive the camshafts of each cylinder bank. The primary
chains transmit the drive from two sprockets on the
crankshaft to variable valve timing units on the intake
camshafts. The secondary chains transmit the drive from
the variable valve-timing units to sprockets on the
exhaust camshafts.
A key locates the two drive sprockets on the crankshaft.
The crankshafts torsional vibration damper retains the
sprockets in position. The variable valve timing units
and the exhaust camshaft sprockets are non-interference,
non-keyed fits on their respective camshafts; the drive
being transmitted by the face to face friction load
produced by the valve timing unit/sprocket securing
bolt.
Each chain has a hydraulic tensioner operated by engine
oil. The primary chains are lubricated via oil squirt tubes
located at the front of the engine block, near the
crankshaft drive sprockets. A jet of oil from the end of
each secondary chain tensioner lubricates the secondary
chains. The primary chain tensioners act on pivoting
flexible tensioner blades. The secondary chain tensioners
act directly on the chains. Guide rails are installed on
the drive side of the primary chains.
Timing Cover
The aluminium alloy timing cover accommodates the
crankshaft front oil seal (a PTFE lip seal). Silicon rubber
in-groove gaskets seal the joint between the timing cover
and the front face of the engine.
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							CYLINDER HEAD COMPONENTS
Camshaft bearing cap1Tappet (shimless)2
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							Collet3
Valve spring cap4
Valve spring5
Valve stem oil seal6
Valve7
Inlet camshaft8
Exhaust camshaft9
Cylinder Heads
The cylinder heads are unique to each cylinder bank.
Deep-seated bolts, to reduce distortion, secure the
cylinder heads to the cylinder block. Two hollow dowels
align each cylinder head with the cylinder block.
The 14 mm spark plugs, one per cylinder, locate in
recesses down the centre line of each cylinder head.
The engine-lifting eyes are bolted to the cylinder heads;
two on the rear (one per head) and one at the front.
Camshaft Covers
The camshaft covers are manufactured from
thermo-plastic. The A bank camshaft cover incorporates
an outlet for the part load engine breather. The B bank
camshaft cover incorporates an outlet for the full load
engine breather and the engine oil filler cap. Identical
oil separators are incorporated below the breather outlet
in each cover.
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							Silicon rubber in-groove gaskets seal the joints between
the camshaft covers and the cylinder heads. Together
with spacers and seals on the camshaft cover fasteners,
they also isolate the covers from direct contact with the
cylinder heads, to reduce noise.
Cylinder Head Gasket
The multi-layered steel cylinder head gasket has cylinder
specific water flow cross-sections for uniform coolant
flow.
Camshafts
The camshafts are manufactured in chilled cast iron.
Five aluminium alloy caps retain each camshaft.
Location numbers, 0 to 4 for the intake camshaft and 5
to 9 for the exhaust camshaft, are marked on the outer
faces of the caps.
Sensor Ring
Inlet camshaft1
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