Perkins Phaser Series - Page 44

12 CYLINDER HEAD ASSEMBLY
Exhaust valves
Diameter of valve stem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9,43/9,46 mm (0.371/0.372 in)
Clearance in valve guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0,05/0,13 mm (0.002/0.005 in)
Maximum clearance in valve guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0,15 mm (0.006 in)
Diameter of valve head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37,26/37,52 mm (1.467/1.477 in)
Angle of valve face . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45°
Full length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123,07/123,57 mm (4.845/4.865 in)
Seal arrangement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Rubber seal fitted to valve guide
Depth of valve head below face of cylinder head AA, AB, AC, AD(1), AG, AH, YA(2), YB, YC:
Note: The exhaust 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1,28/1,60 mm (0.050/0.063 in)
- Service limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1,85 mm (0.073 in)
(1) AD vehicle applications fitted with an intercooler . . . . . . . . . . . . . . . 1,47/1,79 mm (0.058/0.070 in)
(2) YA engines fitted with original valve seat inserts . . . . . . . . . . . . . . . 1,47/1,79 mm (0.058/0.070 in)
Depth of valve head below face of cylinder head AE, YD(1), YE:
- Production limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1,47/1,79 mm (0.058/0.070 in)
(1) Engine build list YD 80571 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1,28/1,60 mm (0.050/0.063 in)
12A.24 Perkins Phaser/1000 Series, April 1995