Generac Power Systems NP-40G - Manual (Page 125)

Part 8- SPECIFICATIONS & CHARTS
Engine Specifications (Continued)
MODEL NO. GN-190 GN-220
OIL PUMP (CONT’D):
OUTER PUMP ROTOR
OUTSIDE DIAMETER:
Design Diameter
Wear Limit
1.296-1.297 Inch (32.92-32.95mm)
1.292 Inch (32.82mm) Minimum
1.296-1.297 Inch (32.92-32.95mm)
1.292 Inch (32.82mm) Minimum
OUTER PUMP ROTOR
THICKNESS:
Design Thickness
Wear Limit
0.314-0.316 Inch (8.000-8.025mm)
0.312 Inch (7.95mm) Minimum
0.314-0.316 Inch (8.000-8.025mm)
0.312 Inch (7.95mm) Minimum
OIL PRESSURE
RELIEF VALVE SPRING:
Force required to com­
press spring to 1.035
inch (26.3mm)
0.85-0.95 lbs (0.39-0.43 kg) 0.85-0.95 lbs (0.39-0.43 kg)
CRANKSHAFT END PLAY:
Allowable crankshaft
end play 0.006-0.023 Inch (0.14-0.60mm) 0.006-0.023 Inch (0.14-0.60mm)
COMPRESSION PRESSURE:
While Cranking
(Cold Engine) 60 psi Minimum 60 psI Minimum
Engine Torque Specifications
Cylinder Head Bolts 25 Ib-ft 29 Ib-ft
Connecting Rod Bolts lOlb-ft 10 Ib-ft
Flywheel Nut 75 Ib-ft 75 Ib-ft
Sump Cover Bolts 100 Ib-ln 18 Ib-ft
Ignition Coll Mount Bolts 5 Ib-ft 5 Ib-ft
Spark Plug 13 Ib-ft 13 Ib-ft
Intake Elbow 5 Ib-ft 5 Ib-ft
Carburetor to Intake Elbow 3.8 Ib-ft 3.8 Ib-ft
Rocker Arm Pivot Ball
Jam Nut 6.3 Ib-ft 6.3 Ib-ft
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