54
©
Scania CV AB 1997 01:01-02
Program 96
Changing valve tappets
1. Clamp the side cover in a vice. Remove the
retaining ring and valve tappet.
2. Fit a new valve tappet. Fit the retaining ring,
using a screwdriver.
Camshaft bearings
- There is very little wear on the camshaft and
camshaft bearings and these components rarely
need any work to be done on them.
- However, when reconditioning the engine,
check that the bearing surfaces and cams are
not abnormally worn.
- Fit new bearings so that the lubricating holes
are opposite the oilways in the block.
Checking camshaft setting
1. Set the crankshaft at TDC for No. 1 cylin-
der’s compression stroke (valves closed).
2. Set up two dial gauges against the valve
spring thrust washers.
3. Adjust the rocker arms so that there is no
clearance and then an additional 0.1 mm (see
that both valves are open 0.1 mm).
4. Zeroize both dial gauges.
5. Turn the crankshaft one revolution in its
direction of rotation until the TDC position is
reached again.
6. Read the two dial gauges and compare the
results with the values given below:
Intake valve lifting height 0.55-1.65 mm
Exhaust valve lifting height 0.50-1.50 mm
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