Workshop Manual, TSD3450E, Issue 1 73
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Gear case and drive assembly 6
General information
The cast iron gear case contains the timing gears for the engine and the gears which drive the coolant pump,
the lubricating oil pump and the fuel transfer pump (A8). Both helical and spur gears are used. The crankshaft
gear (A2), the large gear of the compound idler (A3), the coolant pump gear (A4) and the lubricating oil pump
gear (A1) are helical. The gears which remain are spur gears.
An adjustable idler gear (A6) provides the backlash between the main idler (A7) and the camshaft gear (A5).
If the cylinder head and head gasket are removed, the tolerances may change and the position of the
adjustable idler gear can be adjusted to obtain the correct backlash settings.
The camshaft drive gear is fitted with pendulum rollers. These are designed to counteract the injector pulses
and eliminate vibration and noise.
For correct engine timing, a line is provided on the large gear of the compound idler which aligns with a ‘V’ on
the crankshaft gear, and a mark on the camshaft drive gear aligns with a line at the top of the gear case.
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