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Engine - Engine and crankcase
2
NDIL14TR00001FA
Timing gears
The crankshaft timing gear is heated and press fitted on to the front of the crankshaft, to a high degree of accuracy
during manufacturing. This enables precise timing being maintained during the life of the engine. The crankshaft gear
drives the idler gear, which is attached to the front of cylinder block. The idler gear then drives the camshaft and the
injection pump via meshing helical gears.
The camshaft gear is bolted to the front of the shaft and is keyed to maintain position of the gear on the camshaft.
Lubrication system
Lubrication of the engine, figure 3 is maintained by a gear type oil pump mounted in the rear of the engine block.,
forward of the flywheel on the left-hand side viewing from rear side of the engine. The oil pump is driven from the rear
of the camshaft and drains oil from the engine oil sump through a tube and screen assembly.
A spring loaded relief valve is integral with the oil filter and prevents over pressurization of the system. A spin on type
oil filter is mounted externally to its support housing on the left-hand side of the engine.
Oil flows from the filter to the main oil gallery, which runs the length of the cylinder block, which also intersects the
camshaft follower chamber.
The main gallery also supplies oil to the crankshaft main bearings, connecting rods both big and small ends and timing
gear bushes. The underside of the pistons and pins are lubricated by oil pressure spray jets fitted in the cylinder block
and oil supply is via a internal drilled passage through the 2nd bearing in the cylinder block. Big end are without a
hole for small end bush as lubrication is through jets.
Timing gears are lubricated by splashed oil from the cam follower chamber and the pressure lubricated camshaft drive
gear bushing.
An intermittent flow of oil is directed to the value rocker arm shaft assembly via a drilled passage in the cylinder block.
This is located vertically above number 3 camshaft bearing and aligns to a hole in the cylinder head. The rotation of
the camshaft allows a controlled intermediate flow of lubrication.
47899740 24/06/2015
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