
Workshop Manual, TPD 1350, issue 3
51
12
New 1000 Series
Valve guides
To inspect
12-10
To check the valve guides for wear: The maximum
permissible clearance (A5) with a valve lift of 15,0 mm
(0.6 in), between the valve stem and the bore of the
guide is 0,100 mm (0.008 in) for inlet valves and 0,121
mm (0.011 in) for exhaust valves. If the clearance,
with a new valve fitted, is more than the limit, then a
new valve guide (A4) must be fitted.
It is recommended that the procedure given below is
used to check the valve guide clearance:
1 Put a new valve in the valve guide.
2 Put a dial test indicator with a magnetic base (A1)
onto the face of the cylinder head.
3 With the valve lifted 15,0 mm (0.6 in) and the gauge
(A2) in contact with the edge of the valve head (A3),
move the valve radially away from the gauge. With the
valve held in this position, set the gauge to zero.
4 Move the valve radially across the axis of the
cylinder head towards the gauge. Make a note of the
reading on the gauge. If the reading is equal to or
greater than the data given below, a new valve guide
(A4) must be fitted.
Note: The partially finished valve guides are reamed
and the valve seats are cut in one operation with a
special tool. The valve seat and the guide are cut in
one operation to ensure the concentricity of the valve
seat to the valve guide. This will ensure a good seal
between the guide and its seat. New valves and new
valve seat inserts must be fitted each time a new
valve guide is fitted. Valves must not be lapped
, see
operation 12-13
. If all or most of the original valve
guides need to be renewed it may be cost effective to
overhaul or exchange the cylinder head.
3
1
2
4
5
A
A0298
Purchased from www.WorkshopManuals.co.uk
Содержание New 1000 Series
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