Onan NHC Series - Page 6

DIMENSIONS AND CLEARANCES
All clearances given at room temperature of 70° F.
All dimensions in inches unless otherwise specified.
Minimum Maximum
Valve Stem in Guide—Intake 0.0010 u.OO^b
Valve Stem in Guide—Exhaust 0.0025 0.0040
Valve Spring Length
Free Length 1.662
Compressed Length 1.375 ^j.
Valve Spring Tension (Ib.)
Open
Closed
Valve Seat Bore Diameter
Intake
Exhaust
Valve Seat Diameter
Intake
Exhaust
Valve Stem Diameter
Intake
Exhaust
Valve Guide Diameter (I.D.)
Valve Lifter Diameter
Valve Lifter Bore
Valve Seat Interference Width
Valve Face Angle
Valve Seat Angle
Valve Interference Angle
Crankshaft Main Bearing
Crankshaft End Play
Camshaft Bearing
Camshaft End Play
Camshaft Lift
Camshaft Bearing Diameter
Camshaft Journal Diameter
Rod Bearing (Forged Rod) .- •
Connecting Rod End Play (Ductile Iron)
Timing Gear Backlash
Oil Pump Gear Backlash
Piston to Cylinder, Strut Type (Measured below oil-controlling ring—
90° from pin) Clearance
Piston Pin Diameter
Piston Pin in Piston
Piston Pin in Rod .•
Piston Ring Groove Width
TUP 1 :
Top 2
Top 3
Piston Ring Gap in Cylinder
Piston Ring Side Clearance (Top compression ring only)
Crankshaft Main Bearing Journal—Standard Size
Main Bearing Diameter :
Main Bearing Clearance
Crankshaft Rod Bearing Journal—Standai'd Size
Cylinder Bore—Standard Size
71
79
38
42
1.5645 1.5655
1.2510 1.2520
1.569 1.570
1.255 1.256
0.3425 0.3430
0.3410 0.3415
0.344
0.346
0.7575
0.7480
0.7505
0.7515
1/32 3/64
44"
45°
1°
0.0025 . 0.0038
0.005
0.009
0.0015
0.0030
0.003
—
0.3UO
1.3760 1.3770
1.3740 1.374b
0.0005 0.0023
0.002 0.016
0.002
0.003
0.002
0.005
0.0015 0.0035
0.7500
0.7502
Thumb Push HI
0.0001
0.0005
0.0955 0.0965
0.0955
0.0965
0.1880 0.1890
0.010 0.020
0.006
1.9992 2.0000
2.0015
2.0040
0.0015 0.0043
1.6252 1.6260
3.5625 3.563b