New Holland SmartTrax T8.320 Service Manual page 44

Install the rocker arm shaft assembly using tool number:
380000149.
Camshaft timing
The double idler gear location is fixed. The upper single
idler gear location can be adjusted and is used to set the
back lash between the idler gear and the camshaft gear.
This back lash has to be checked and set since this is
an overhead camshaft engine. All for the gear train is
mounted to the block except the camshaft gear which is
mounted to the cylinder head. Set the back lash before
the rocker arm assembly is installed.
Use a dial indicator to measure the camshaft gear to idler
back lash. Only measure the back lash between the upper
idler gear and the camshaft gear. Install the dial indicator
tangential to a camshaft gear tooth. Hold the idler so that
it does not move and rock the camshaft gear.
Correct back lash is 0.080 - 0.180 mm (0.003 - 0.007 in).
Rotate the flywheel clockwise until the D hole appears in
the bottom view hole. Install a dial indicator (1) on the
number 3 exhaust valve rocker arm camshaft roller (2) as
shown.
Preload the dial indicator 6.00 mm (0.24 in).
Rotate the engine clockwise until the dial indicator stops
moving: lift up on the valve end of the rocker arm to take
any clearance or play out and to verify that you are on the
inner base circle of the camshaft, the lowest point.
Engine - Engine and crankcase
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