Defender. Manual — part 72
Item
Part Number
Description
A
-
Coolant pump connection
B
-
Engine oil cooler connection
1
-
Coolant distribution manifold
The coolant distribution manifold is located on the LH of the cylinder block, just below the intake manifold. The manifold
receives coolant from the coolant pump and distributes it to the cylinder block and the engine oil cooler.
CRANKSHAFT AND SUMP COMPONENTS
The main crankshaft and sump components are:
The crankshaft and main bearings
Ladder frame and sump
Oil filter and engine cooler assembly
Crankshaft and Main Bearings
Item
Part Number
Description
1
-
Crankshaft
2
-
Upper main bearing shell
3
-
Upper main bearing shell (No.3 is a thrust bearing)
4
-
Bearing cap
5
-
Lower main bearing shell
The crankshaft is forged steel and fillet rolled with induction hardened journals, which run in 5 bearings with clamped 2
layer bearing shells.
The crankshaft drive pulley is not keyed onto the crankshaft; it is secured to the crankshaft by a single bolt.
The main bearing caps are double and cross-bolted, this adds to the strength and rigidity of the engine block.
The main bearings are aluminum/tin split plain selective bearings. An oil groove in the top half of each bearing transfers
oil into the crankshaft for lubrication of the connecting rod bearings. The upper and lower shells of bearing number 3
contain integral thrust washers, which limits the end float of the crankshaft.
The arrow on the bearing caps must point towards the front of the engine and are identified as follows:
Bearing cap
Identification
1
F (front)
2
2
3
3
4
4
5
R (rear)
The crankshaft front and rear oil seals are a press fit in the oil seal retainers.
Ladder Frame and Sump
Item
Part Number
Description
1
-
Oil pan
2
-
Ladder frame
3
-
Cylinder block
The aluminum alloy ladder frame is fitted to the lower cylinder block to stiffen the base structure of the engine thus
helping to reduce Noise, Vibration and Harshness (NVH). The frame is made of high-pressure die cast aluminum and
also incorporates an oil baffle plate to reduce oil foaming and splash.
The ladder frame and the cylinder block side clearance must be aligned using a special tool. The rear clearance must be
aligned using a suitable straight edge (for more information refer to the workshop repair manual).
The ladder frame is secured to the cylinder block with 22 retaining bolts. The pressed steel oil pan is bolted to the
ladder frame with 16 bolts. The engine oil drain plug is located at the rear face of the oil pan and the oil
level/temperature sensor is located at the RH side of the ladder frame, behind the turbocharger oil drain tube.
The engine oil pump is bolted to the underside of the ladder frame at the front LH side and is driven by a sprocket on
the crankshaft via a dedicated chain (for more information refer to the lubrication section).
A reusable gasket seals the joint between the oil pan and the ladder frame; a bead of sealant seals the joint between the
sump and the ladder frame.
Oil Filter and Engine Oil Cooler Assembly
Item
Part Number
Description
1
-
Hose - coolant distribution manifold to oil cooler
2
-
Oil cooler
3
-
Oil pressure switch
4
-
Oil filter
5
-
Mounting plate
The oil filter and engine oil cooler assembly is mounted to the LH side of the ladder frame with 6 bolts. The oil pressure
switch locates through the oil filter and engine oil cooler assembly mounting plate and into the ladder frame (for more
information refer to the lubrication section).
CAMSHAFT DRIVE COMPONENTS
The main camshaft drive components are:
Drive gear assembly
Front cover
Drive Gear
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