Appendix B—Specifications for HG600/THG600 Series
Bolt Torque Values (in ft•lb)
Cylinder Size
2 .75"
3 .25"
4"
5"
6"
8"
Connection rod bolt
40
40
40
40
40
40
Bearing carrier
40
40
40
40
40
40
Bearing cover
40
40
40
40
40
40
Crankcase inspection plate
8
8
8
8
8
8
Adapter to crankcase or distance piece
1
65
65
65
65
65
65
Distance piece to crankcase
1
65
65
65
65
65
65
Cylinder to adapter
1
65
65
65
65
65
65
Valve cover plate bolt
35
35
40
40
40
40
Valve holddown screw
2
40
40
40
40
40
40
Piston nut torque
150
150
150
150
150
150
Piston screw torque
100
50
100
100
100
100
Valve unloader cap torque
25
25
25
25
25
25
Head to cylinder
1
65
65
65
65
65
65
1
Preliminary tightening: Snug all head bolts in the sequence show. Final tightening: Torque all head bolts in the sequence shown to the value listed above.
2
Retorque to the value listed above after 2 to 5 hours of running time.
Horizontal Compressor Bolt Tightening Sequence
45
