Appendix B—Specifications for Vertical Single and Double-Acting
Models 91–891
Clearances and Dimensions for Single-Acting Models
Model 91 291 490 491
691
(M crankcase)
“X” piston clearance figure 5.4A and 5.4B
1
0.020
0.044
0.020
0.044
0.000
0.024
0.020
0.044
0.025
0.040
Clearance from connecting rod bearing to
crankshaft journal
0.001
0.0025
0.001
0.0025
0.001
0.0025
0.0019
0.0035
Clearance from wrist pin to wrist pin
bushing
2
0.0006
0.0 011
0.0006
0.0 011
0.0006
0.0 011
0.0009
0.0015
Maximum cylinder bore diameter 3.009 3.009 4.011 4.515
Cylinder finish (RMS) 16–32 16–32 16–32 16–32
Minimum piston ring radial thickness 0.082 0.082 0.082 0.082
Maximum clearance from oil pump
adapter shaft to bushing
2
N/A 0.0050 0.0050 0.0050
Crankshaft end play
0.000
0.002
0.000
0.002
0.000
0.002
0.002
0.003
Maximum flywheel runout at O.D. 0.020 0.020 0.020 0.020
Maximum clearance from crosshead to
crosshead guide bore
0.011 0.011 0.012 0.013
Crosshead guide bore finish 32 RMS (limited number of small pits and scratches are acceptable)
Clearances and Dimensions for Double-Acting Models
Model 891
“X” piston clearance figure 5.4A and 5.4B
1
0.010/0.020 (bottom)
0.084/0.104 (top)
Clearance from connecting rod bearing to
crankshaft journal
0.0019
0.0035
Clearance from wrist pin to wrist pin
bushing
2
0.0009
0.0015
Maximum cylinder bore diameter 4.515
Cylinder finish (RMS) 16–32
Minimum piston ring radial thickness 0.082
Maximum clearance from oil pump
adapter shaft to bushing
2
0.0050
Crankshaft end play
0.002
0.003
Maximum flywheel runout at O.D. 0.020
Maximum clearance from crosshead to
crosshead guide bore
0.008
Crosshead guide bore finish
32 RMS (limited number of small pits
and scratches are acceptable)
1
Clearances should be set with machine cold.
2
Dimensions for honing are included with new bushings (which must be installed, then honed).
35
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