Perkins Phaser Series - Data and Dimensions

CYLINDER HEAD ASSEMBLY 12
Data and dimensions
Note: This information is given as a guide for personnel engaged on engine overhauls. The dimensions
which are shown are those which are mainly used in the factory. The information applies to all engines,
unless an engine type code is shown.
Cylinder head
Angle of valve seat:
- Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46° (88° included angle)
- Inlet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46° (88° included angle) or 31° (118° included angle)
Diameter of parent bore for valve guide . . . . . . . . . . . . . . . . . . . . 15,87/15,89 mm (0.6247/0.6257 in)
Leak test pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 kPa (29 lbf/in
2
) 2,04 kgf/cm
2
Head thickness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102,79/103,59 mm (4.047/4.078 in)
Minimum permissible thickness after head face has been machined . . . . . . . . . . 102,48 mm (4.035 in)
- AE, YE engines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .See operation 12A-12
Inlet valves
Diameter of valve stem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9,46/9,49 mm (0.3725/0.3735 in)
Clearance in valve guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0,02/0,10 mm (0.0008/0.0039 in)
Maximum clearance in valve guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0,13 mm (0.005 in)
Diameter of valve head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44,86/45,11 mm (1.766/1.776 in)
Angle of valve face . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45° or 30°
Full length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122,66/123,07 mm (4.829/4.845 in)
Seal arrangement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Rubber seal fitted to valve guide
Depth of valve head below the face of cylinder head AA, AB, AC, AD(1), AG, AH, YA(2), YB, YC:
Note: The inlet valve depth for certain engine types fitted with valve seat inserts can vary. The complete
engine number must be given to the distributor when parts are needed.
- Production limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1,27/1,60 mm (0.050/0.063 in)
- Service limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1,85 mm (0.073 in)
(1) AD vehicle applications fitted with an intercooler . . . . . . . . . . . . . . 1,37/1,68 mm (0.054/0.066 in)
(2) YA engines fitted with original valve seat inserts . . . . . . . . . . . . . . . 1,37/1,68 mm (0.054/0.066 in)
Depth of valve head below the face of cylinder head YD(1):
- Production limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1,37/1,68 mm (0.054/0.066 in)
(1) Engine build list YD 80571 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1,27/1,60 mm (0.050/0.063 in)
- AE, YE engines:
- Production limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1,37/1,62 mm (0.054/0.064 in)
- Production limits (for 30° valves) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1,27/1,76 mm (0.050/0.069 in)
- Service limit (for 30° valves) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2,01 mm (0.079 in)
Perkins Phaser/1000 Series, April 1995 12A.23