Timing Gear Train, Front Cover & Camshaft

A.DESCRIPTION

1.GEAR

Train

The timing gear train consists of four gears. The Crankshaft pinion, the camshaft gear, the idler gear and the injection pump gear. These gears are mounted on the front plate face of the engine and are covered with the aluminium casting crankcase front cover. Each gear is punch marked for timing purpose.

2.CAMSHAFT

The special cast iron/forged camshaft runs in babbit lined bushes in the right hand side of the crankcase. The camshaft bushes are replaceable and are supplied for service in a semi-finished bored condition and must be line reamed to size after filling. A gear integral with the camshaft provides the drive for the oil pump.

The camshaft is driven from the front end of the crankshaft through a train of gears. All gears are punch marked to ensure correct timing. End float is controlled by thrust washer plate (4-3). The drive gear is key shrunk to the camshaft end.

B.FRONT COVER

1.Removal a)Remove the fan belt and fan as detailed in cooling system. b)Remove the bolt (2-1). c)Remove front side hydraulic pump mounting bolts pull hydraulic pump out somewhat and move slightly towards the outside. d)Pull the fan driver pulley (3-1) off the crankshaft and remove the key. e)Remove alternator and alternator bracket. f)Remove the bolts from the front cover bottom and adapter plate. g)Remove the bolts (1-1) securing the front cover (4-1) then remove the cover and gasket.

NOTE: Check the backlash between the gears to specifications if necessary.

2.DISMANTLING

Press out the oil seal if inspection proves it necessary.

3.ASSEMBLY

Press in a new oil seal with the lip facing inward until it is flush with the outside face of the front cover.

4.INSTALLATION

Reverse the removal procedure.