Service Manual

Engine
Item Standard Specification Limit
Compression kPa (psi) Minimum 960 (137)
Compression pressure
difference between cylinders kPa (psi) Maximum 100 (14)
Cylinder Head
Overall height mm (in.) 108.9 – 109.1 (4.287
– 4.295) 0.2 ( .008) see NOTE *
Flatness of gasket surface mm (in.) Less than 0.05 (.0019) 0.2 (.008)
Oversize rework
of valve seat hole mm (in.)
Intake
0.3 (.012) oversize 31.300 – 31.325
(1.2323 – 1.2333)
0.6 (.024) oversize 31.600 – 31.625
(1.2441 – 1.2451)
Exhaust
0.3 (.012) oversize 29.300 – 29.321
(1.1535 – 1.1544)
0.6 (.024) oversize 29.600 – 29.621
(1.1653 – 1.1662)
Oversize rework of valve guide hole
(both intake and exhaust) mm (in.)
0.05 (.002) oversize 12.050 – 12.068
(.4744 – .4751)
0.25 (.010) oversize 12.250 – 12.268
(.4823 – .4830)
0.50 (.020) oversize 12.500 – 12.518
(.4921 – .4928)
Camshaft
Cam height mm (in.)
Intake
No. 1 35.09 (1.3815) 34.59 (1.3618)
No. 2 35.07 (1.3807) 34.57 (1.3610)
No. 3 35.06 (1.3303) 34.56 (1.3606)
Exhaust
No. 1 35.15 (1.3839) 34.65 (1.3642)
No. 2 35.13 (1.3831) 34.63 (1.3634)
No. 3 35.19 (1.3854) 34.69 (1.3657)
Journal O.D. mm (in.) 40.940 – 40.955
(1.6118 – 1.6124)
Bearing oil clearance mm (in.) 0.045 – 0.085
(.0018 – .0033)
End play mm (in.) 0.06 – 0.14
(.0024 – .0055)
Rocker Arm
Clearance (rocker arm to shaft) mm (in.) 0.012 – 0.043 0.1 (.004)
(.0005 – .0017)
Rocker Shaft
O.D. mm (in.) 16.985 – 16.998
(.6687 – .6692)
Length mm (in.) 232.0 (9.134)
* NOTE: Limit must be combined with amount of grinding of cylinder block gasket surface.
NOTE: O.D. = Outside Diameter
Liquid Cooled Gas Engine
Page 3 – 4
Workman 3000/4000 Series