
12
50
Workshop Manual, TPD 1350, issue 3
New 1000 Series
To inspect and to correct
12-9
Special tools:
Gauge, valve depth, PD.41D
Dial gauge for use with PD.41D, PD.208
1 Check the depth of the valves below the face of the
cylinder head before the valve springs are removed.
2 Ensure that the heads of the valves and the bottom
face of the cylinder head are clean.
3 Put the valve depth gauge on the face of the
cylinder head and zero the dial gauge.
4 Carefully put the valve depth gauge in position over
the head of each valve (A) and make a note of the
measurement. The maximum depth, in service, is
given in the data and dimensions.
5 If a valve is below the depth limit, check the valve
depth with a new valve in position. If the valve depth
is still below the limit and a valve seat insert is fitted,
the insert must be renewed.
6 Check the valves for cracks. Check the stems of the
valves for wear and for correct fit in their valve guides.
Caution: Renew damaged valves, the special heat
resistant layer on the face of the valve will be detroyed
if valves are lapped.
7 Check that the seat faces of the valves are not
badly burnt or damaged. Seat faces of valves which
are damaged can be ground on a special machine.
When new valves are fitted, the valve depths must be
checked after the valve springs are fitted.
8 Check that the load on the valve springs is correct
at their fitted length, see the data and dimensions. Fit
new valve springs at every complete engine overhaul.
A
A0063
Purchased from www.WorkshopManuals.co.uk
Содержание New 1000 Series
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