Piston Head End And Crank End Clearance; Cylinder Sizes, Bores, Piston Diameters, Clearance And Weight - GE H301 Series Operating Manual

Piston Head End and Crank End Clearance

The piston head end and crank end clearance is variable and determined by
the assembly of 10 or more parts depending upon the cylinder configuration.
Standard practice is to set the crank end piston clearance at 1/3 (but not less
than 0.040") and head end clearance at 2/3 the summation of the head and
crank end clearances. Piston end clearance is measured by placing solder or
soft aluminum wire into the cylinder via an inlet port. Rotate crankshaft pushing
piston through stroke and crushing soft solder or aluminum wire. Use dial caliper
or 0-1" micrometer to measure crushed thickness of soft solder or aluminum
wire. Manually rotate the crankshaft several revolutions to assure no head end
interference. Monitor for abnormal vibration and/or knocking noise on startup
warm up. The CNG step cylinders having a concentric head end valve, set the
crank end piston clearance at 0.040 to 0.050". CNG step cylinder piston head end
clearance measurement is difficult to achieve repeatable values and is, therefore,
not practical. Piston rod runout tolerance is 0.000 to 0.002" horizontal and 0.000 to
0.005" vertical measured with dial indicator.
Cylinder Sizes, Bores, Piston Diameters, Clearance and
Weight
The H301/302 cylinder size, bore and piston diameter, clearance and weight of the
fixed clearance or VVCP assembly for lubricated cylinders are listed below.
Cylinder
size Bore diameter
inches inches (mm)
(mm)
1.25 1.250 (31.750)
1.252 (31.801)
(31.75)
1.5 1.500 (38.100)
(38.10) 1.502 (38.151)
1.75 1.750 (44.45)
(44.45) 1.751 (44.4754)
2 2.000 (50.8)
(50.8) 2.001 (50.8254)
2.5 2.500 (63.500)
(63.50) 2.502 (63.551)
3 3.000 (76.200)
(76.20) 3.002 (76.251)
3.5 3.500 (88.900)
(88.90) 3.502 (88.951)
4 4.000 (101.600)
(101.60) 4.002 (101.650)
4.5 4.500 (114.300)
(114.30) 4.502 (114.350)
Piston Clearance
diameter
inches
inches (mm) (mm)
1.238 (31.445) 0.008 (0.203)
1.242 (31.547) 0.014 (0.356)
1.488 (37.795) 0.008 (0.203)
1.492 (37.897) 0.014 (0.356)
1.730 (43.942) 0.018 (0.4572)
1.732 (43.9928) 0.021 (0.5334)
1.980 (50.292) 0.018 (0.4572)
1.982 (50.3428) 0.021 (0.5334)
2.488 (63.195) 0.008 (0.203)
2.492 (63.297) 0.014 (0.356)
2.982 (75.743) 0.008 (0.203)
2.992 (75.997) 0.020 (0.508)
3.480 (88.392) 0.015 (0.381)
3.485 (88.519) 0.022 (0.559)
3.983 (101.170) 0.013 (0.330)
3.987 (101.270) 0.019 (0.480)
4.482 (113.840) 0.013 (0.330)
4.487 (113.970) 0.020 (0.507)
Double Tandem/
Acting Stepped
cylinder cylinder
assembly assembly
estimated estimated
weight weight
pounds (kg) pounds (kg)
190 (86.182) 170 (77.110)
190 (86.182) 170 (77.110)
270 (122.469) 130 ( 58.967)
280 (127.005) 140 (63.502)
310 (140.613) -
VVCP Cylinder
assembly head
estimated estimated
weight weight
pounds (kg) pounds (kg)
6 (2.721)
19 (8.618) 8 (3.628)
31 (14.061) 10 (4.535)
34 (15.422) 11 (4.989)
46 (20.865) 15 (6.803)
H301/302 HSR Compressors | Rev. 2.2 | 25