3176C and 3196 Marine Engines Caterpillar

Illustration 1	g00281161

(1) Diameter of gear bore for bearing ... 60.163 ± 0.015 mm (2.3686 ± 0.0006 inch)

Diameter of shaft for idler gear ... 55.047 ± 0.020 mm (2.1672 ± 0.0008 inch)

(2) Idler gear

(3) Front face of the block

(4) Camshaft gear

(5) Front timing gear housing

(6) Tighten the bolts to the following torque. ... 240 ± 40 N·m (175 ± 30 lb ft)

(7) Camshaft

(8) Front face of the block

(9) Camshaft idler gear

Diameter of gear bore for bearing ... 74.452 ± 0.015 mm (2.9312 ± 0.0006 inch)

Diameter of shaft for idler gear ... 69.141 ± 0.008 mm (2.7221 ± 0.0003 inch)

(10) Crankshaft gear

(11) Crankshaft

(12) Tighten the bolts to the following torque. ... 100 ± 20 N·m (75 ± 15 lb ft)

(13) Align the timing marks that are on the idler gear with the timing marks that are on the crankshaft gear and the camshaft gear.

Illustration 2	g00281162
Typical example of the gear assembly for the idler gears

(14) Inside diameter of bearing that is installed in idler gear (2) ... 55.163 ± 0.041 mm (2.1718 ± 0.0016 inch)

Inside diameter of bearing that is installed in camshaft idler gear (9) ... 69.205 ± 0.013 mm (2.7246 ± 0.0005 inch)

(15) Bearing

(16) Measure the distance from the front of the bearing to the front of the idler gear (2). Distance ... 1.00 ± 0.25 mm (0.039 ± 0.010 inch)

Measure the distance between the front of the bearing and the front of the camshaft idler gear (9). Distance ... 1.00 ± 0.25 mm (0.039 ± 0.010 inch)