The Detroit 60 Series engine is known for having issues with excessive pressure in the cooling system due to a variety of reasons. One common cause is a malfunctioning pressure relief valve in the cooling system, which can lead to a build-up of pressure. Another possible reason is a faulty head gasket, which can allow combustion gases to enter the cooling system and increase pressure. Additionally, a clogged or restricted radiator can also contribute to increased pressure in the cooling system. Regular maintenance and inspections can help identify and address these issues to prevent damage to the engine.
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Bad head gasket or cylinder head. Suggest to check air compressor before working on the head.