FOR MODELS: JGW, JGR AND JGJ SECTION 1 - DESIGN SPECIFICATIONS & DATA
1/01 PAGE 1 - 9
Clearances
NOTE: MEASURED CLEARANCES WILL NOT NECESSARILY AGREE BECAUSE OF
OIL FILMS, ASSEMBLY TOLERANCES, WEAR, ETC. PLASTIGAGES, SOL-
DER, ETC. ARE NOT TO BE USED.
TABLE 1-3: CLEARANCES
DESCRIPTION CLEARANCE, IN. (CLEARANCE, mm)
Crankshaft Dust Seal (Feeler Gauge - Centered) 0.008 to 0.010 (0.20 to 0.25)
Crankshaft Thrust (End) 0.0085 to 0.019 (0.215 to 0.48)
Crankshaft Journal Bearing (Jack) 0.001 to 0.004 (0.025 to 0.10)
Crankshaft Pin to Connecting Rod Bearing (Jack) 0.002 to 0.005 (0.05 to 0.125)
Connecting Rod Thrust (Side) 0.010 to 0.021 (0.25 to 0.53)
Connecting Rod Bushing to Crosshead Pin 0.0015 to 0.0035 (0.038 to 0.089)
Crosshead Bushing to Crosshead Pin - JGJ/JGR 0.0015 to 0.0035 (0.038 to 0.089)
Crosshead (Bronze) to Crosshead Pin 0.0015 to 0.0028 (0.038 to 0.071)
Crosshead (Gray Iron) to Crosshead Pin - JGW 0.0015 to 0.0028 (0.038 to 0.071)
Crosshead (Babbitted Ductile Iron) to Guide - JGJ/JGR (Feeler Gauge
a
)
a. Crosshead guide to crosshead clearance at the top is to be checked by inserting a standard 0.5 inch (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 inch (0.038 mm) feeler stock at the 4
corners. If the feeler can be inserted more than 0.5 inches (13 mm), the assembly is not acceptable.
0.0060 to 0.0095 (0.152 to 0.241)
Crosshead (Babbitted Bronze) to Guide (Feeler Gauge
a
)
0.0080 to 0.0115 (0.203 to 0.292)
Crosshead (Gray Iron) to Guide - JGW (Feeler Gauge
a
)
0.0090 to 0.0125 (0.229 to 0.318)
Total Piston End Clearance - Double Acting
b
b. If piston end clearance is not within table tolerance, crank end + head end, contact Packager or Ariel.
0.110 to 0.170 (2.79 to 4.32)
Piston End Clearance - Crank End - Double Acting
b
0.040 (1.02)
Piston End Clearance - Head End - Double Acting
b
0.070 to 0.130 (1.78 to 3.30)
Total Piston End Clearance - Tandem
b
0.200 to 0.260 (5.08 to 6.60)
Piston End Clearance - Crank End Tandem
b
0.040 (1.02)
Piston End Clearance - Head End Tandem
b
0.160 to 0.220 (4.06 to 5.59)
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