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3.4.3 Piston to Cylinder Clearances
Clearances Minimum
Maximum
Crosshead piston to guide
0.008"
0.010"
8.0" - 10.0" Dia cylinder
0.035"
0.040"
7.0” – 8.0” Dia cylinder
0.032”
0.037”
6.0" - 7.0" Dia cylinder
0.030"
0.035"
5.0" - 5.25" Dia cylinder
0.025"
0.030"
4.125" – 4.75" Dia cylinder
0.020"
0.025"
3.5" - 4.0" Dia cylinder
0.018"
0.022"
2.75" – 3.25" Dia cylinder
0.015"
0.020"
2.0" – 2.5" Dia cylinder
0.013"
0.018"
1.25" – 1.75" Dia cylinder
0.016"
0.025"
Table 5 Piston to Cylinder Clearances
3.4.4 Torque
Settings
Torque Settings
Size
Type
Torque ft-lb
Piston Nut (8” to 8-1/2” Piston)
1-1/8” - UNF
150
3" - 3-1/2" Piston
1" – UNF
-
200
Piston Rod to Crosshead Lock Nut
1" – UNF
Rod
300
Piston Rod to Crosshead
1" – UNF
-
300
Final Stage Cylinder to C.E.Cylinder
¾" – UNC
Stud
125
Final Stage Cylinder to C.E.Cylinder
¾" – UNF
Stud
106
Final Stage Head
¾" – UNF
Stud
140
Cylinder Head. 10"
¾" – UNF
Stud
96
Cylinder Head. 6" Thru 8"
¾" – UNF
Stud
96
Crosshead Cylinder To Crankcase
¾" – UNF
Stud
105
Compression Cylinder To Crosshead
Guide
¾" – UNF
Stud
112
Crankcase Inspection Cover
5/8" – UNC
Cap Screw
92
Valve Lantern Jacking Screw
5/8" - UNF
Socket Set Screw
80
Crankcase Mounting Bolts
5/8" - UNC
Hex Bolts
80
Cylinder Head. 4-½" thru’ 3-1/2”
5/8" - UNC
Cap Screw
51
Final Stage Discharge Valve Cover
½" – UNF
Cap Screw
50
Cylinder Head. 3-1/4" thru’ 3”
½" – UNC
Cap Screw
51
Valve Covers
½" – UNC
Cap Screw
45
Oil Filter Housing
½" – UNC
Cap Screw
53
Split Flange Clamps
½" – UNC
Bolt
45
Conrod Bearing Cap
½ " - UNF
Cap Screw
62
Intermech Ltd.
BBR-6015-2 Compressor Service Manual
