3116 and 3126 Truck Engines Gear Group (Front) – Install

Installation Procedure

Note: For information on reusability of the camshaft idler gear, refer to Guideline For Reusable Parts And Salvage Operations, SEBF8045, “Timing Gears for All Engines”.

1.Use Tooling (A) and a suitable press to install the sleeve bearing in the camshaft idler gear.

2.Install the bearing sleeve to a depth of 0.40 ± 0.25 mm (0.016 ± 0.010 inch) below the front face of the gear.

3.Place the idler shaft (3) on the cylinder block. Install bolts (1) that hold the idler shaft to the cylinder block. Tighten the bolts to a torque of 70 ± 15 N·m (51 ± 11 lb ft).

4.Install camshaft idler gear (2) on idler shaft (3). The timing marks should face outward.

5.Align the timing marks on camshaft idler gear (2) with the timing marks on the crankshaft drive gear.

Type 2

1.Use Tooling (A) and a suitable press and install the sleeve bearing in the camshaft idler gear.

2.Install plate (4) on the back of idler shaft (3). Position idler gear assembly on the cylinder block. Install bolts that hold the idler gear to the engine block. Tighten the bolts to a torque of 70 ± 15 N·m (51 ± 11 lb ft).

3.Install camshaft idler gear (2) on idler shaft (3). The timing marks should face outward.

4.Align the timing marks on camshaft idler gear (2) with the timing marks on the crankshaft drive gear.

Type 3

1.Position idler shaft (3) on the cylinder block. Install the shortest bolt in the recessed hole in idler shaft (3). This bolt will hold the shaft in position on the cylinder block.

2.Install camshaft idler gear (2) on idler shaft (3). The timing marks should face outward.

3.Align the timing marks on idler gear (2) with the timing marks on the camshaft drive gear.

4.Position plate (4) over the gear and install the remaining bolts (1). Tighten bolts (1) to a torque of 70 ± 15 N·m (51 ± 11 lb ft).
End By:

a.Install the front housing. Refer to Disassembly and Assembly, “Housing (Front) – Install”.
b.Install the camshaft. Refer to Disassembly and Assembly, “Camshaft – Install”.
c.Install the crankshaft front seal. Refer to Disassembly and Assembly, “Crankshaft Front Seal – Install”.
d.Install the crankshaft vibration damper and pulley. Refer to Disassembly and Assembly, “Vibration Damper and Pulley -Remove and Install”.

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