Generac Power Systems NP-40G - Manual (Page 124)

Part 8- SPECIFICATIONS & CHARTS
Engine Specifications (Continued)
MODEL NO. GN-190 GN-220
PISTON (CONT’D):
OIL CONTROL RING
WIDTH:
Assembled Width
Wear Limit \
0.111-0.118 Inch (2.825-3.003mm)
0.110 Inch (2.795mm)
0.111 -0.118 Inch (2.825-3.003mm)
0.110 Inch (2.795mm)
OIL CONTROL RING \
END GAP*: \
Design End Gap
Wear Limit
0.015-0.055 Inch (0.38-1.40mm)
0.062 Inch (1.60mm) Maximum
0.015-0.055 inch (0.38-1.40mm)
0.062 Inch (1.60mm) Maximum
CAMSHAFT ASSEMBLY:
MAIN CAMSHAFT
BEARING DIAMETER
(FLYWHEEL END):
Design Diameter
Wear Limit
1.022-1.023 Inch f25.96-25.98mm)
1.020 Inch (25.91mm) Minimum
1.022-1.023 inch (25.96-25.98mm)
1.020 inch (25.91mm) Minimum
MAIN CAMSHAFT
BEARING DIAMETER
(PTO END):
Design Diameter
Wear Limit
1.022-1.023 Inch (25.96-25.98mm)
1.020 Inch (25.91mm) Minimum
1.297-1.298 Inch (32.96-32.98mm)
1.295 Inch (32.89mm) Minimum
CAM LIFT:
Design Lift
Wear Limit
0.210-0.212 Inch (5.34-5.38mm)
0.206 Inch (5.24mm) Minimum
0.210-0.212 Inch (5.34-5.38mm)
0.206 Inch (5.24mm) Minimum
BASE CIRCLE
DIAMETER OF CAM:
Design Diameter
Wear Limit
0.978-0.990 Inch (24.85-25.15mm)
0.974 Inch (24.75mm) Minimum
0.978-0.990 Inch (24.85-25.15mm)
0.974 Inch (24.75mm) Minimum
COMPRESSION
RELEASE LIFT
(MEASURED AT
TAPPET):
Design Lift
Wear Limit
0.027-0.055 Inch (0.70-1.40mm)
0.023 Inch (0.60mm) Minimum
0.020-0.047 inch (0.50-1.2mm)
0.016 inch (0.406mm) Minimum
OIL PUMP:
PUMP TIP
CLEARANCE (Measure
on shaft In sump cover):
Design Clearance
Wear Limit
0.0000-0.0010 Inch (0.000-0.025mm)
0.004 Inch (0.105mm) Maximum
0.0000-0.0010 inch (0.000-0.025mm)
0.004 inch (0.105mm) Maximum
INNER PUMP ROTOR
BORE:
Design Bore
Wear Limit
0.354-0.355 Inch (9.000-9.019mm)
0.357 Inch (9.034mm) Maximum
0.354-0.355 Inch (9.000-9.019mm)
0.357 Inch (9.034mm) Maximum
INNER ROTOR
THICKNESS:
Design Thickness
Wear Limit
0.3124).315 Inch (7.95-8.00mm)
0.311 Inch (7.90mm) Minimum
0.312-0.315 Inch (7.95-8.00mm)
0.311 Inch (7.90mm) Minimum
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