Group 21 Service procedures - engine
27
Valve guides, inspection
Special tools: 998 9876, 999 9696
To determine the degree of valve guide wear, fit a new valve
into the guide and then measure the amount of play with a
dial indicator.
1
Put the cylinder head on a flat surface with the head resting
on the valve guides.
2
Fit a new valve into a valve guide pushing the valve down
until the stem rests against the flat surface underneath.
3
Use a dial indicator with a magnetic stand, placing the tip of
the dial indicator against the edge of the valve.
4
Move the valve sideways in the direction of the exhaust or
inlet ducts. Note the reading of the dial indicator.
Wear tolerances:
Inlet valve max play 0.30 mm (0.0118")
Exhaust valve max play 0.45 mm (0.0177")
If these amounts of play are exceeded, the valve guides
must be replaced.
To Next Page
Loading...
Need help?
General
