SEAL AS 3049305 - Caterpillar

Procedure for the Pressure Test
If the engine contains a water jacket, a fuel passage, or an oil passage, the water jacket, the fuel passage, and the oil passage must be checked separately.
Heat the water in the tank to a minimum temperature of 82 °C (180.0 °F).
Cover the openings on the cylinder head with a steel plate and seals or gaskets.
Attach a fitting to the plate in order to connect the air supply.
Use a hoist and a lift in order to submerge the cylinder head in the tank so that the water level covers all surfaces.
Apply a constant air pressure of 415 kPa (60.0 psi) minimum to the submerged cylinder head for one hour.
Observe the submerged cylinder head for any signs of air bubbles during the one hour test.Note: If no air bubbles are observed during the test, the cylinder head does not have any internal leaks.
Coat the cylinder head with a rust preventive in order to prevent rusting.
Inspect the valves, valve seat inserts, and the valve guides. If necessary, replace any components that do not meet the Reuse and Salvage Guidelines.Note: Refer to Reuse and Salvage Guideline, SEBF8162, "Procedure to Measure and Salvage Cylinder Head Assemblies and Related Components" for information on procedures, criteria for inspection, and tooling.
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Fabricated hydraulic puller for valve seat inserts
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Pulling a valve seat insert with a fabricated puller
Remove the valve seat inserts from the cylinder head. Refer to Catalog, NENG2500, "Dealer Service Tool Catalog" for a listing of pullers. Pullers may also be fabricated in order to remove the valve seat inserts.
Inspect the valve seat inserts for reusability. If the valve seat insert is cracked or damaged, replace the valve seat insert.Note: A damaged valve seat insert may cause engine failure.
Install the valve seat inserts into the cylinder head. Refer to Catalog, NENG2500, "Dealer Service Tool Catalog" for a list of tooling in order to install the valve seat inserts.
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Serdi 100 Valve Seat and Guide Cutting Machine
Machine the valve seat inserts or the bores for the valve seat inserts.Note: Some valve seats cannot be machined. Refer to Reuse and Salvage Guideline, SEBF9006, "Specifications for Cylinder Head Assemblies on C-Series Engines" in order to determine if a valve seat can be machined. Specialized manufacturing processes were used on these parts. Machining these parts will significantly decrease the life of the engine.Cutting tools for the valve seats are more effective than grinding in several ways. Cutters are faster and more accurate than grinding stones. Cutters maintain the dimensions longer. However, cutters are more expensive.Stones for grinding wear every time of use. Stones for grinding periodically need to be shaped resulting in additional labor for each job and one more step for error. Grinding produces dust and debris which adds more contamination to the process of reconditioning.The cylinder head must be protected from corrosion, external damage, and dirt after cleaning if the cylinder head is stored.Note: Refer to Reuse and Salvage Guideline, SEBF8162, "Procedure to Measure and Salvage Cylinder Head Assemblies and Related Components"