Lister Petter LT and LV Operators Handbook
page 15
4.5 Valve Clearance Adjustment
The valve clearance for both inlet and
exhaust valves must be set with the
engine cold.
1. Remove the cylinder head cover.
2. Ensure the cylinder head nuts are
correctly tightened.
3. Turn the flywheel until the piston is at
the TDC position on the firing stroke;
TDC is marked on the flywheel.
4. Slacken the locknut (A) and adjust the
screw (B) until the correct clearance
has been obtained.
GO - 0.10mm (0.004in).
NOT GO - 0.15mm (0.006in).
Figure 4.5.1 Setting the Valve Clearance
5. Tighten the locknut whilst restraining
the adjusting screw and re-check to
ensure the clearance is correct.
6. Repeat for the remaining valve.
7. Replace the rocker cover taking care
to ensure the decompressor lever is
vertical.
4. Engine Servicing
- valves and decompressor adjustment
4.6 Decompressor Adjustment
This adjustment should only be made
when the valve clearance is correctly
adjusted.
1. Remove the cylinder head cover.
2. Turn the flywheel until the piston is at
the TDC position on the firing stroke;
TDC is marked on the flywheel.
3. Adjust the screw (A) until the exhaust
valve just begins to move downwards
when the lever is vertical.
4. Turn the screw a further turn clockwise
so that it travels towards the rocker.
Figure 4.6.1 Decompressor Adjustment
5. Replace the rocker cover taking care
to ensure the decompressor lever is
vertical.
