Perkins 103-06 Workshop Manual page 18

- Inspection and Correction A.
Cylinder head
With a straight edge and a thickness gauge,
check for warping of the cylinder head lower
face.
Check six positions (A to F lines, as shown) for
warping. If found to be warped excessively,
correct with a surface grinder.
Standard value
0.05mm or less
(.002")
B. Valve guide and valve stem
a. Check the valve stem for excessive wear or
damage. If found to be excessively
damaged, replace.
b. Check valve stem diameters at positions I, II
and III with a micrometer. If the diameter is
less than allowable limit, replace.
PB029
PB030
Allowable limit
0.12mm
(.005")
Intake valve 103-09/10/Perama M25/M30
Standard diameter
6.955-6.97mm
(.274")
Intake valve 103-06
Standard diameter
5.960-5.975mm
(.2346-.2352")
Exhaust valve 103-09/10/Perama M25/M30
Standard diameter
6.94-6.95mm
(.274")
Exhaust valve 103-06
Standard diameter
5.940-5.955mm
(.2339-2344")
c. Thickness of valve head
If valve head thickness is less than allowable
limit, replace valve.
Standard thickness
0.925-1.075mm (
.036"-.042")
t
T h i c k n e s s
4
Allowable limit
6 89mm
(271 )
Allowable limit
5.9mm (
.2323)
Allowable limit
6.84mm
(.269)
Allowable limit
5.9mm (
.2323)
I
PB031
Allowable limit
0.5mm
(.020)
PB127