Service Manual

Engine (cont.)
Item Standard Specification Limit
Valves
Valve length mm (in.)
Intake 100.6 (3.960)
Exhaust 100.8 (3.968)
Stem O.D. mm (in.)
Intake 6.565 – 6.580
(.2585 – .2591)
Exhaust 6.530 – 6.550
(.2571 – .2579)
Face angle 45
– 45.5
Thickness of valve head (margin) mm (in.)
Intake 1.0 (.039) 0.5 (.020)
Exhaust 1.3 (.051) 0.8 (.031)
Valve Stem to Guide Clearance mm (in.)
Intake 0.02 – 0.05 0.10 (.0039)
(.0008 – .0020)
Exhaust 0.050 – 0.085 0.15 (.0059)
(.0020 – .0033)
Valve Guides
Length mm (in.)
Intake 44 (1.73)
Exhaust 49.5 (1.949)
Service size mm (in.) 0.25 (.010)
0.50 (.020) oversize
Valve Seat
Width of seat contact mm (in.) 0.9 – 1.3 (.035
– .051)
Seat angle 30 / 44
 / 65
Sink mm (in.) 0.2 (.008)
Valve Spring
Free length mm (in.) 46.3 (1.823) 45.3 (1.783)
Load / installed height N/mm (lb./in.) 210 / 37.7 (46 / 1.48)
Out of squareness Less than 2 4
Cylinder Block
Cylinder bore mm (in.) 65.00 – 65.03
(2.5591 – 2.5602)
Out of roundness and
taper of cylinder bore mm (in.) Less than 0.01 (.0004)
Flatness of gasket surface mm (in.) Less than 0.05 (.0020) .01 (.0039)
Counterbalance Shaft
Front journal diameter mm (in.) 19.987 – 20.000
(.7869 – .7874)
Rear journal diameter mm (in.) 43.984 – 44.000
(1.7317 – 1.7322)
Oil clearance mm (in.)
Front journal 0.035 – 0.068
(.0014 – .0027)
Rear journal 0.035 – 0.071
(.0014 – .0028)
Liquid Cooled
Gas Engine
NOTE:
O.D. = Outside Diameter
Workman 3000/4000 Series Page 3 – 5 Liquid Cooled Gas Engine