27/5/2014 ENGINES & GENERATOR SETS: C13, C15, and C18 Generator Set Engines / Gear Group (Front) - Time

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C13, C15, and C18 Generator Set Engines / Gear Group (Front) - Time

Front gear group(1) Timing marks(2) Camshaft gear(3) Adjustable idler gear(4) Idler gear(5) Cluster gear(6) Timing marks(7) Crankshaft gear(8) Oil pump gear

The basis for the correct fuel injection timing and the valve mechanism operation is determined by the alignment of the timing

for the front gear group. Timing marks (1) and timing marks (6) are aligned in order to provide the correct relationship between

Gear Group (Front) - Time

Static Check of the Timing Gear Position

27/5/2014 ENGINES & GENERATOR SETS: C13, C15, and C18 Generator Set Engines / Gear Group (Front) - Time

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the piston movement and the valve movement.

Table 1

Part Number Description

374-3473 Gear Segment Tool

Note: The rocker arm bolts must be loosened to remove preload from the camshaft.

Front cover is removed.

1. With the front cover removed, remove bolts (3), plate (2), and adjustable idler gear (1) .

Required Parts

Timing Procedure Using Gear Lash

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2. Loosen one bolt and two nuts (4) that secure the stub shaft. Remove the remaining three nuts. The one bolt and two

nuts (4) can still be accessed when the gear segment tool is installed.

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(5) Timing marks(6) 374-3473 Gear Gauge

3. With the flywheel pinned at TDC for cylinder one, align timing marks (5) .

4. Install the cam gear backlash tool onto the stub shaft, as shown. Both sides of the gear segment tool should be

engaged with the corresponding gear, as shown. Hand tighten the one bolt and two nuts enough so that slight

resistance is felt if the stub shaft is rotated.

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5. Measure the backlash between camshaft gear (2) and gear segment tool (3). When the gear segment tool is held

stationary, the backlash between the gears is 0.3556 ± 0.254 mm (0.0140 ± 0.010 inch). Lightly tap the stub shaft

with a soft mallet to move the gear segment tool closer to the cam gear or further away from the cam gear as

necessary to increase or decrease the amount of backlash.

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6. Once the proper backlash is obtained, tighten the nuts and the bolt (4) to a torque of 55 ± 10 N·m (41 ± 7 lb ft).

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7. Remove the cam gear backlash tool and tighten the remaining three nuts to 55 ± 10 N·m (41 ± 7 lb ft).

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8. Install idler gear (1). Verify that the correct amount of backlash is still correct, and the mark on the camshaft gear is

still aligned with the mark on the front housing.

9. Install plate (2). Before installing bolts (3), clean the bolts with a wire brush to remove the old thread lock compound.

Apply Loctite242 to the threads of the bolts and install the bolts. Then, tighten to the proper torque.

10. Install the front cover. Refer to Disassembly and Assembly, "Housing (Front) - Install".