Timing Case And Drive Assembly; General Description - Perkins New 1000 Series Workshop Manual

New 1000 Series
6

Timing case and drive assembly

6

General description

The timing case (A) is for engines fitted with a gear driven coolant pump. The timing case (B) is for engines
fitted with a belt driven coolant pump. The timing case is made of either aluminium or cast iron.
The timing gears on most engines are made of steel, but cast iron gears are used on certain low rated engines.
A power take-off is available on the left side of the aluminium timing case or from both sides of the timing case
made of cast iron. Some applications that need a power take-off from both sides of the timing case can have
an idler gear assembly that uses needle roller bearings.
The drive from the crankshaft gear passes through an idler gear to the camshaft gear and to the gear of the
fuel injection pump. The drive from the crankshaft gear also passes through a lower idler gear to the gear of
the lubricating oil pump or, on some four cylinder engines, to the gear of the balancer unit. The gear driven
coolant pump is driven by the gear of the fuel injection pump. The camshaft and the fuel injection pump run at
half the speed of the crankshaft.
The aluminium cover of the timing case contains the front oil seal; this is made of Viton and has a dust lip in
front of the main lip. On some engines the cover has a noise shield fitted to its front face.
Warning! Read the safety precautions for "Viton seals" on page 6.
The camshaft is made of cast iron. The cam lobes and the eccentric for the fuel lift pump are chill hardened.
A B
A0129 A1646
Workshop Manual, TPD 1350E, Issue 4 123
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