Onan DJA Series User Manual

DIMENSIONS AND CLEARANCES
All clearances given at room temperature of 70° F.
All dimensions in inches (metrics in parentheses) unless otherwise specified.
Minimum Maximum
CAMSHAFT
Bearing Journal Diameter, Front. 2.500 (63.5 mm) 2.505 (63.63 mm)
Bearing Journal Diameter, Rear 1.1875 (47.63 mm) 1.1880 (30.18 mm)
Bearing Clearance Limit 0.0012 (.031 mm) 0.0037 (.094 mm)
End Play, Camshaft 0.007 (.18 mm) 0.039 (.99 mm)
Cam Tappet Hole Diameter 0.7505 (19.06 mm) 0.7515 (19.09 mm)
Cam Tappet Diameter 0.7475 (18.99 mm) 0.7480 (19.00 mm)
CONNECTING RODS
Large Bearing Bore Diameter 2.1871 (55.55 mm) 2.1876 (55.57 mm)
Small Bushing Bore Diameter 1.044 (26.52 mm) 1.045 (26.54 mm)
Distance Center Large Bearing Bore to Small
Bushing Bore 5.998 (152.35 mm) 6.002 (152.45 mm)
Clearance, Large Bearing to Crankshaft 0.001 (.03 mm) 0.003 (.08 mm)
CYLINDER
Cylinder Bore 3-1/4 (82.55 mm)
Cylinder Diameter Limits ' 3.2495 (82.54 mm) 3.2505 (82.56 mm)
CRANKSHAFT
Main Bearing Journal Diameter 2.2437 (56.99 mm) 2.2445 (57.01 mm)
Crankshaft Main Bearing Clearance 0.0014 (.036 mm) 0.0052 (.132 mm)
Connecting Rod Journal Diameter 2.0597 (52.32 mm) 2.0605 (52.34 mm)
End Play, Crankshaft 0.010 (.25 mm) 0.015 (.38 mm)
PISTON
Piston Clearance to Cylinder Wall ' 0.0055 (.140 mm) 0.0075 (.191 mm)
Piston Pin Hole Diameter 0.9900 (25.146 mm) 0.9903 (25.153 mm)
Ring Groove Width, Top 0.097 (2.46 mm) 0.098 (2.49 mm)
2nd 0.0965 (2.45 mm) 0.0975 (2.48 mm)
3rd 0.0965 (2.45 mm) 0.0975 (2.48 mm)
4th 0.1880 (4.78 mm) 0.1895 (4.81 mm)
PISTON PIN
Length 2.738 (69.55 mm) 2.753 (69.93 mm)
Diameter ! ' 0.9899 (25.14 mm) 0.9901 (25.15 mm)
Piston Clearance Thumb Push Fit
Connecting Rod Bushing Clearance 0.0002 (.005 mm) 0.0007 (.018 mm)
PISTON RINGS
Ring Type
Top Compression
2nd Compression
3rd Compression
4th Oil Control
Ring Width
Top 0.0925 (2.35 mm) 0.0935 (2.37 mm)
2nd , 0.0925 (2.35 mm) 0.0935 (2.37 mm)
3rd 0.0925 (2.35 mm) 0.0935 (2.37 mm)
VALVE INTAKE (Hardened Chrome Alloy Faced)
Stem Diameter 0.3381 (8.59 mm) 0.3420 (8.69 mm)
Clearance in Guide 0.0005 (.013 mm) 0.0025 (.064 mm)
Seat Angle 42-degrees
Valve Clearance 0.011 (.28 mm)
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Onan DJA Series Specifications

General

Brand	Onan
Model	DJA Series
Category	Engine
Language	English