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Construction
0---16
Timing gears
There are two main types of a timing gear assemblies, so---
called narrow--- and broad timing gear casing.
The timing gear train consists of hardened, helically cut gear
wheels. The gears are encased by the timing gear casing
which is fitted to the front of the engine. The timing gear drives
the camshaft, fuel injection pump, oil pump and coolant
pump.
If the engine is equipped with the broad timing gear casing,
there is a separate drive unit for a hydraulic pump or a com-
pressor. The drive unit is driven via a small idler gear.
The idler gear is supported with a bevelled ball bearing on the
shaft on the front face of the cylinder block.
Narrow timing gear casing
1. Camshaft gear
2. Idler gear
3. Injection pump gear
4. Coolant pump gear
5. Crankshaft gears
6. Oil pump gear
Broad timing gear casing
1. Camshaft gear
2. Idler gear
3. Injection pump gear
4. Coolant pump gear
5. Crankshaft gears
6. Oil pump gear
7. Small idler gear
8. P.T.O. gear
