Appendix B—Specifications for Vertical Single-Acting Models 91–891
Bolt Torque Values (in ft•lb)
Model 91 291 491 691 891
Connecting rod bolt 28 28 30 40 40
Bearing carrier 38 30 26 40 40
Bearing cover 38 30 35 40 40
Crankcase inspection plate 15 13 8 9 9
Crosshead guide 30 25 33 40 65
Cylinder to head
1,2
20 20 33 30 65
Valve cover plate bolt — — 35 37 37
Valve holddown screw
2
40 40 40 40 40
Piston locknut 45 45 45 60 150
Piston screw 50 50 100 100 8
Valve cap with gaskets 40 40 40 40 —
Valve cap with O-rings 25 25 25 25 25
1
Preliminary tightening – snug all head bolts in the sequence shown. Final torqueing – torque all head bolts in the sequence shown to the listed value.
2
Retorque to the listed value after 1 hour running time.
1
12 11
2
310 5 7
68 4 9
MODEL 891
34
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