SEAL-O-RING 4406409 - Caterpillar

Removal Procedure
Start By:
Remove the fuel priming pump. Refer to Disassembly and Assembly, "Fuel Priming Pump - Remove and Install".
Personal injury can result from hot coolant, steam and alkali.At operating temperature, engine coolant is hot and under pressure. The radiator and all lines to heaters or the engine contain hot coolant or steam. Any contact can cause severe burns.Remove cooling system pressure cap slowly to relieve pressure only when engine is stopped and cooling system pressure cap is cool enough to touch with your bare hand.Do not attempt to tighten hose connections when the coolant is hot, the hose can come off causing burns.Cooling System Coolant Additive contains alkali. Avoid contact with skin and eyes.
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products.Dispose of all fluids according to local regulations and mandates.
Drain the coolant from the cooling system into a suitable container for storage or disposal.
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Loosen hose clamp (1) and remove the hose.
Loosen fittings (2) and (3). Immediately cap all openings or plug all openings in order to prevent contamination.
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Remove five bolts (4) and water temperature regulator housing (5) from the exhaust manifold.
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Remove water temperature regulator (6) from water temperature regulator housing (5) .
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Remove O-ring seal (7) from water temperature regulator housing (5). Inspect the O-ring seal for wear or damage. If the O-ring seal is worn or damaged, use a new part for replacement.Installation Procedure
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
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Lubricate O-ring seal (7) with 1U-6396 O-Ring Assembly Compound .
Position O-ring seal (7) in water temperature regulator housing (5) .
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Install water temperature regulator (6) in water temperature regulator housing (5) .
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Position water temperature regulator housing (5) on the exhaust manifold and install five bolts (4) .
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Unplug fittings (3) and (2). Tighten fittings (3) and (2) .
Install the hose and tighten hose clamp (1) .
Fill the cooling system with coolant to the correct level. Refer to the Operation and Maintenance Manual, "Refill Capacities" for the correct level.End By: Install the fuel priming pump. Refer to Disassembly and Assembly, "Fuel Priming Pump - Remove and Install".