Heavy Duty Balanced Opposed Compressors - Ariel Corporation

FOR MODELS: JGZ AND JGU SECTION 1 - DESIGN SPECIFICATIONS & DATA
Clearances
TABLE 1-4 CLEARANCES
DESCRIPTION
CLEARANCE,
INCHES
CLEARANCE,
(mm)
Crankshaft Dust Seal (Feeler Gauge - Centered) 0.010 to 0.014 (0.25 to 0.35)
Crankshaft Thrust (End) 0.015 to 0.030 (0.38 to 0.76)
Crankshaft Journal Bearing (Jack) 0.0055 to 0.009 (0.14 to 0.23)
Crankshaft Pin to Connecting Rod Bearing
(Vertical Jack)
0.0055 to 0.009 (0.14 to 0.23)
Connecting Rod Thrust (Side) 0.0115 to 0.0275 (0.29 to 0.70)
Connecting Rod Bushing to Crosshead Pin 0.002 to 0.005 (0.05 to 0.13)
Crosshead Bushing to Crosshead Pin - Iron Crosshead
0.002 to 0.005 (0.05 to 0.13)
Crosshead to Crosshead Pin - Bronze Crosshead 0.002 to 0.004 (0.05 to 0.10)
Crosshead to Guide - Babbitted Iron (Feeler Gauge a ) 0.011 to 0.017 b (0.28 to 0.43)
Crosshead to Guide - Babbitted Bronze
(Feeler Gauge 1 )
0.015 to 0.021 (0.38 to 0.53)
a. Crosshead guide to crosshead clearance at the top is to be checked by inserting a standard 0.5
inches (13 mm) wide feeler stock from one side edge of the crosshead across to the opposite side.
This is to be done at both ends. The bottom clearance is to be checked with 0.0015 inches (0.04 mm)
feeler stock at the four corners. If the feeler can be inserted more that 0.5 inches (13 mm), the
assembly is not acceptable.
b. With D-4958, D-4959 or D-4960 crosshead, starting 3/07; with older D-3486, D-3513, D-3796 or
D-4120 crossheads, clearance is 0.009 to 0.015 in. (0.23 to 0.38 mm).
Table 1-5 PISTON END CLEARANCES a
CYLINDER CLASS CRANK END HEAD END TOTAL b
IN. (mm) IN. (mm) IN. (mm)
17-7/8, 20-1/8, 22, 24-1/8
& 26-1/2 Z:U
0.060 (1.5) 0.105 to 0.165 (2.7 to 4.2) 0.165 to 0.225 (4.2 to 5.7)
All ZL:UL:ZN:UN 0.300 (7.2) NO SET 0.635 to 0.695 (16.1 to 17.7)
All ZM:UM 0.045 (1.1) 0.090 to 0.150 (2.3 to 3.8) 0.135 to 0.195 (3.4 to 4.9)
All Other Z:U 0.045 (1.1) 0.090 to 0.150 (2.3 to 3.8) 0.135 to 0.195 (3.4 to 4.9)
a. See “Piston and Rod - Installation” on page 5-40 for setting instructions.
b. If your total piston end clearance is not within table tolerance, contact your Packager or Ariel.
NOTE: MEASURED CLEARANCES WILL NOT NECESSARILY AGREE BECAUSE OF
OIL FILMS, ASSEMBLY TOLERANCES, WEAR, ETC.
PLASTIGAGES, SOLDER, ETC. ARE NOT TO BE USED.
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