VALVE-MECHANISM GP 2P6526 - Caterpillar

Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Hot engine components can cause injury from burns. Before performing maintenance on the engine, allow the engine and the components to cool.
Turn the fuel supply to the OFF position and turn the power disconnect switch to the OFF.
Illustration 1 g03515340
Illustration 2 g03515737
Remove bolts (1), (2), (3), and (4) .Note: Cap all hose assemblies, with Tooling (D), and fittings that are disconnected o prevent fluid loss. This action will also keep contaminants out of the systems.
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Disconnect hose assemblies (5), (6), (7) and (8).
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Disconnect harness assemblies (9) and (10). Remove temperature sensor (11) .
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Loosen clamp (14). Remove bolts (12) and remove pipe assembly (13). Remove the gasket (not shown).
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Remove nuts (19) and remove combustion head (18) .
Remove gasket (17), tube assembly (16), and gasket (15). Discard the gaskets.Note: The gaskets are for one time use only. Replace with new gaskets upon installation.
If required, remove studs (20) .
Illustration 7 g03515817
Remove fittings (21) and (22) .
Remove spark plug (23) and remove fittings (24) .
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Use Tooling (B) in order to remove O-ring seals (25) and (26) from harness assembly (10). Discard the O-ring seals.Installation Procedure
Install combustion head (18) in reverse order of removal.
Apply Tooling (A) onto the threads of studs (20). Install the studs. Tighten studs (20) to a torque of 17 2 N m (150 18 lb in).
Apply Tooling (A) onto the threads of the studs and nuts (19). Tighten nuts (19) in a crisscross pattern to a torque of 23 3 N m (17 2 lb ft). Tighten nuts (19) again in a crisscross pattern to a torque of 28 3 N m (21 2 lb ft). Tighten nuts (19) again in a crisscross pattern to a torque of 28 3 N m (21 2 lb ft).
Use caution when you are using isopropyl alcohol. Avoid prolonged skin contact with isopropyl alcohol.Vapors may be harmful if inhaled. Use only in a well ventilated area. Do not smoke while using isopropyl alcohol.Isopropyl alcohol is flammable. Do not use near an open flame or near welding operations. Keep isopropyl alcohol away from heated surfaces exceeding 482°C (900°F).
Note: This connection is an electrical connection and cannot be lubricated with a petroleum-based lubricant. Isopropyl alcohol is the only approved lubrication for this connection.
Lubricate new O-ring seals (25) and (26) with Tooling (C) prior to installation.
Tighten fitting (24) to a torque of 60 6 N m (44 4 lb ft).
Tighten fittings (21) and (22) to a torque of 30 2 N m (266 18 lb in).
Tighten spark plug (23) to a torque of 47 4 N m (35 3 lb ft).
Apply Tooling (A) to the threads of temperature sensor (11) and install the sensor. Tighten temperature sensor (11) to a torque of 45 5 N m (33 3 lb ft).
Check the coolant level. If necessary, refer to Operation and Maintenance Manual, "Coolant - Change" for the