Perkins New 1000 Series, Workshop Manual, Page: 54 / 290

12
54 Workshop Manual, TPD 1350, issue 3
New 1000 Series
Cylinder head
To inspect and to correct 12-12
1 Remove the cylinder head assembly , see operation
12-7 .
2 Remove the thermostat housing.
3 Inspect the cylinder head for signs of gas or coolant
leakage.
4 Remove the valve springs and the valves , see
operation 12-8 .
5 Clean the face of the cylinder head and the
passages for coolant and for lubricating oil. The water
jacket can be cleaned with a special solvent which
must be used in accordance with the manufacturer's
instructions.
6 Test the cylinder head for leaks at the pressure
given in the data and dimensions.
7 When the cylinder head is thoroughly clean, check
it for cracks. Inspect carefully the areas around the
valve seats and around the holes for the atomiser
nozzles.
8 The bottom face of the cylinder head can be
machined if there is distortion,
see paragraph 9 ; there
are deep scratches; or, for engines without valve seat
inserts, the valve depths are below the service limit.
9 Use a straight edge and feeler gauges to check the
cylinder head for distortion across and along its
bottom face, see the data and dimensions. If the
distortion is more than the limit given in the data and
dimensions, the bottom face can be machined, see
the data and dimensions for the surface grade finish
of the cylinder head face.
Caution: Remove only the minimum material and
ensure that the thickness of the cylinder head will not
be less than 102,48 mm (4.035 in) after the cylinder
head has been machined.
Caution: After the cylinder head has been machined
the valve seats must be corrected to give the correct
valve head depth. Work to the minimum limit to allow
for later wear.
10 Check the valve seats for wear and for damage.
11 Before any work is done on the valve seats, new
valve guides must be fitted
, see operation 12-11 .
12 More badly damaged valve seats can be
corrected by use of the cutter tool
, see operation 12-
13 , or new inserts can be fitted , see operation 12-14 .
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