874325 Volvo.Penta Fitting

Temperature Regulators (Thermostats)
Replacing the thermostats is a good preventive maintenance practice because it reduces the chances for unscheduled downtime. Caterpillar recommends the replacement of these thermostats on a regularly scheduled basis to be the most cost effective way to operate the engine.Caterpillar engines may incorporate a shunt design cooling system which require operating the engine with thermostats.Replace Water Regulators
Typical ExampleFailure to replace thermostats on a regularly scheduled basis could cause damage to cooling system and other engine components. If thermostats fail in the CLOSED position, it will cause excessive engine overheating and could result in cylinder head cracking or piston seizure problems.If thermostats fail in the OPEN position, the engine oil and operating temperature could be too low during partial load operation and could cause an excessive carbon build-up inside the cylinder. This excessive carbon build-up could result in accelerated piston ring and cylinder liner wear.Replace Oil Regulators
Excessive oil overheating could result in accelerated piston ring and cylinder liner wear. * Before proceeding with this maintenance, perform additional cooling system maintenance procedures unless replacing these thermostats ONLY.* If performing this complete maintenance interval, continue to additional cooling system maintenance procedures.Removal and Installation
When replacing thermostats, refer to the Service Manual for disassembly and assembly procedures to replace the thermostats as required in the Maintenance Schedule or contact your Caterpillar dealer for assistance.Cooling System
Clean/Flush Coolant
Do not perform this maintenance until you read and understand the material in the Safety and