15 TIMING CASE AND DRIVE ASSEMBLY
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 most engines
the cover has a noise shield fitted to its front face.
Warning! read the safety precautions for "Viton"
seals on page 10A.08.
The camshaft is made of cast iron. The cam lobes
and the eccentric for the fuel lift pump are chill
hardened.
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PA129
PA307
15A.02 Perkins Phaser/1000 Series, April 1995
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