0384257 JOHNSON CARBURETOR ASSSEMBLY COPLETE, Upper

Illustration 1 g01857156
Gear train
Table 1
Specifications for 329-8423 Front Housing Gp    
Callout     Part Number     Part Name     Specification Description    
1     340-0571     Gear     Torque 8.8 graded bolt to...................
95 N m (70 lb ft)
Torque 10.9 graded bolt to...................
120 N m (89 lb ft)
Number of teeth...................72    
2     342-1306     Idler As     Torque bolts to...................
44 N m (33 lb ft)
Width of light duty idler gear and bearing assembly is
19.95 to 20.05 mm (0.78543 to 0.78937 inch).
Width of medium duty and heavy duty idler gear and bearing assembly is
25.45 to 25.55 mm (1.00197 to 1.00590 inch).
Inside diameter of light duty idler gear bearings is
60.022 to 60.052 mm (2.36307 to 2.36425 inch).
Inside diameter of medium duty and heavy duty idler gear bearings is
56.00 to 56.03 mm (2.20472 to 2.20590 inch).
Outside diameter of light duty idler gear hub is
59.95 to 59.97 mm (2.36023 to 2.36102 inch).
Outside diameter of medium duty and heavy duty idler gear hub is
55.95 to 55.97 mm (2.20275 to 2.20354 inch).
Clearance of light duty idler gear bearing on hub is
0.052 to 0.102 mm (0.00205 to 0.00402 inch).
Clearance of medium duty and heavy duty idler gear bearing on hub is
0.03 to 0.08 mm (0.00118 to 0.00315 inch).
The end play of the light duty idler gear is
0.05 to 0.25 mm (0.00197 to 0.00984 inch).
The end play of the medium duty and heavy duty idler gear is
0.05 to 0.25 mm (0.00197 to 0.00984 inch).
Number of teeth...................97    
3     328-7837     Gear     Torque the nut to...................
64 N m (47 lb ft)
Number of teeth...................36    
4     -     Gear     Number of teeth...................21    
5     -     Gear     Inside diameter of oil pump idler gear bearing is
16.012 to 16.038 mm (0.6304 to 0.6314 inch).
Outside diameter of oil pump idler gear shaft is
15.966 to 15.984 mm (0.6286 to 0.6293 inch).
Clearance of oil pump idler gear bearing on shaft is
0.028 to 0.072 mm (0.0011 to 0.0028 inch).
End play of the oil pump idler gear is
0.050 to 0.275 mm (0.0019 to 0.0108 inch).
End play of the oil pump drive gear is
0.005 to 0.090 mm (0.00020 to 0.00354 inch).    
6     338-1402     Crankshaft Gear     Bore diameter of crankshaft gear is
51.00 to 51.03 mm (2.0079 to 2.0091 inch).
Outside diameter of crankshaft hub is
51.021 to 51.002 mm (2.0087 to 2.0079 inch).
Clearance of gear on crankshaft is
−0.021 to +0.028 mm (−0.00083 to 0.00110 inch).
Number of teeth...................36    Backlash values Backlash between the oil pump idler gear (5) and the oil pump drive gear (4) ... 0.05 to 0.15 mm (0.0020 to 0.0059 inch) Backlash between the oil pump idler gear (5) and the crankshaft gear (6) ... 0.025 to 0.160 mm (0.00098 to 0.00630 inch) Backlash between the idler gear (2) and the crankshaft gear (6) ... 0.05 to 0.15 mm (0.0020 to 0.0059 inch) Backlash between the camshaft gear (1) and the idler gear (2) ... 0.05 to 0.15 mm (0.0020 to 0.0059 inch) Backlash between the fuel injection pump gear (3) and the idler gear (2) ... 0.05 to 0.15 mm (0.0020 to 0.0059 inch) Backlash between the water pump gear (not shown) and the fuel injection pump gear (3) ... 0.05 to 0.15 mm (0.0020 to 0.0059 inch) Backlash between the power take-off drive (if equipped) and the idler gear (2) ... 0.05 to 0.250 mm (0.0020 to 0.0098 inch)