PIN-- 3 in. (7.62 cm ) long 9H9818 - Caterpillar

Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Ensure that number one piston is at top dead center on the compression stroke. Refer to System Operation, Testing and Adjusting, "Finding Top Center for No. 1 Piston" for the correct procedure.
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Ensure that Tooling (E) is installed in Hole (Y) in the cylinder block. Use Tooling (E) in order to lock the crankshaft in the correct position. Refer to System Operation, Testing and Adjusting, "Finding Top Center Position for No.1 Piston" for the correct procedure.
Use Tooling (D) in order to lock the fuel injection pump gear in the correct position. Refer to Disassembly and Assembly, "Fuel Injection Pump - Install" for the correct procedure.
Ensure that the camshaft gear and the key are clean and free from wear and damage.
If necessary, install the key into the nose of the camshaft. Note: Ensure that the key is squarely seated.
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Alignment of timing marks
Align the keyway in camshaft gear (1) with the key in the camshaft. Install the camshaft gear onto the camshaft. Ensure that the timing marks on gear (1), gear (6), gear (7) and gear (8) are in alignment. Refer to Illustration 8.
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Install Tooling (C) through Hole (X) in the camshaft gear into the front housing.
Install washer (9) and bolt (10) to camshaft gear (1).
Remove Tooling (E), Tooling (D), and Tooling (C).
When a 8.8 Graded bolt (10) is installed. Tighten the bolt to a torque of 95 N m (70 lb ft). When a 10.9 Graded bolt (10) is installed. Tighten the bolt to a torque of 120 N m (89 lb ft).
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Install a new O-ring seal (2) to plug (3). Install the plug into Hole (Y) in the cylinder block. Refer to Illustration 11. Tighten plug (3) to a torque of 21 N m (186 lb in).
Use Tooling (F) in order to measure the backlash for gear (1), gear (6), gear (7) and gear (8). Refer to Specifications, "Gear Group (Front)" for further information.
Use Tooling (F) in order to measure the end play of camshaft gear (1). Refer to Specifications, "Camshaft" for further information.
Lubricate the teeth of the gears with clean engine oil.
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Use Tooling (B) in order to tighten threaded inserts (4) on all rocker arms (5). Tighten the threaded inserts to a torque of 30 N m (266 lb in). Note: When the threaded insert is tightened, the threaded insert must be seated correctly into the cup for the pushrod.End By:
Install the front cover. Refer to Disassembly and Assembly, "Front Cover - Remove and Install" for the correct procedure.
Install the valve mechanism cover. Refer to Disassembly and Assembly, "Valve Mechanism Cover - Remove and Install" for the correct procedure.