SLEEVE 1957073 - Caterpillar

Illustration 1 g00554939
(1) Camshaft gear Number of teeth ... 46 (2) Idler gear Number of teeth ... 49 (3) Fuel injection pump drive gear Number of teeth ... 46 (4) Crankshaft gear Number of teeth ... 23Note: Ensure that the marks on the timing gears are in alignment. Align the fuel injection drive gear with the "33" mark with the "3" mark on the idler gear. Make an alignment of the "2" mark on the camshaft gear with the "22" mark on the idler gear. Align the "1" mark on the crankshaft gear with the "11" mark on the idler gear. The No. 1 cylinder is at the top center position when these marks are in alignment.
Table 1
Item     Standard at Assembly     Service Limit (1)    
Backlash of idler gear    
0.03 to 0.17 mm (0.001 to 0.007 inch)    
0.25 mm (0.010 inch)    
End play of idler gear    
0.05 to 0.20 mm (0.002 to 0.008 inch)    
0.35 mm (0.014 inch)    
Clearance between idler gear bushing and shaft    
0.009 to 0.050 mm (0.0004 to 0.0031 inch)    
0.100 mm (0.0039 inch)    
( 1 ) Replace the idler gear if the service limit is exceeded.
Illustration 2 g00555014
Install a dial indicator and rotate the idler gear (2) back and forth in order to measure backlash. Replace the idler gear if the backlash exceeds the service limit. Refer to Table 1.
Illustration 3 g00555085
Idler gear (2) (5) Idler gear bolt Measure the end play of the idler gear with a feeler gauge. Refer to Table 1. Tighten the idler gear bolt to the following torque. ... 34 5 N m (25 4 lb ft)
Illustration 4 g00550976
(6) Inside diameter of idler gear bushing (7) Idler gear shaftReplace the bushing if the clearance between the idler gear bushing and the idler gear shaft exceeds the service limit. Refer to Table 1.
Illustration 5 g00555098
(8) Bolts for the front plate The bolts are fastened to the cylinder block and to the front timing gear housing. Tighten the bolts for the front plate to the following torque. ... 10 to 13 N m (7 to 10 lb ft)