Perkins New 1000 Series, Workshop Manual, Page: 57 / 290

Workshop Manual, TPD 1350, issue 3 57
12
New 1000 Series
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:
- Inlet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46° (88° included angle) or 31° (118° included angle)
- Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46° (88° included angle) or 31° (118° included angle)
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)
Finish grade of head face for cylinder head gasket. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1,10/3,20 micrometers
Diameter of parent bore for valve guide:
- Inlet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13,00/13,027 mm (0.5118/0.5128 in)
- Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14,00/14,027 mm (0.5512/0.5522 in)
Minimum permissible thickness after head face has been machined . . . . . . . . . . . . . . . 102,48 mm (4.035 in)
Inlet valves
Diameter of valve stem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8,953/8,975 mm (0.3525/0.3533 in)
Clearance in valve guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0,025/0,069 mm (0.001/0.0027 in)
Maximum permissible clearance in valve guide:
- Production limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0,089 mm (0.0035 in)
- Service limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0,100 mm (0.008 in)
Diameter of valve head:
- Engine types AJ, AK, AM, AP, AQ, YG, YH, YK . . . . . . . . . . . . . . . . . . . . . 42,88/43,12 mm (1.688/1.698 in)
- Engine types AR and AS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44,88/45,12 mm (1.776/1.767 in)
Angle of valve face . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45° or 30°
Full length, engine types AJ, AK, AM, AP, AQ, YG, YH, YK . . . . . . . . . . . 122,65/123,30 mm (4.829/4.854 in)
Full length, engine types AR and AS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123,75/124,40 mm (4.872/4.897 in)
Seal arrangement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Rubber seal fitted to valve guide, colour green
Depth of valve head below the face of cylinder head
- Production limits, engine types AJ, AK, AM, AP, AQ, YG, YH, YK . . . . . . . . . 1,40/1,70 mm (0.055/0.067 in)
- Service limit, engine types AJ, AK, AM, AP, AQ, YG, YH, YK . . . . . . . . . . . . . . . . . . . . . 1,95 mm (0.077 in)
- Production limits, engine types AR and AS. . . . . . . . . . . . . . . . . . . . . . . . . . . 0,40/0,60 mm (0.016/0.024 in)
- Service limit, engine types AR and AS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0,805 mm (0.032 in)
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