Perkins 4012TESI User's Handbook
![Perkins 4012TESI Engine manual cover](/images/SOWkovyhuqEYCMhNjtWCKTUH/thumbs/thumb175x175.webp)
The recommended oil type for the Perkins 4012TESI engine is a high-quality 15W-40 diesel engine oil meeting API CH-4 or ACEA E5 specifications.
The air filter should be inspected every 250 hours and replaced every 500 hours, or more frequently if operating in dusty conditions.
To bleed the fuel system, ensure the fuel tank is full, open the bleed screws on the fuel filter and injection pump, and manually prime the fuel system using the hand pump until fuel flows without air bubbles.
Check the coolant level and quality, inspect the radiator and hoses for leaks or blockages, ensure the thermostat is functioning properly, and verify the operation of the fan and water pump.
Coolant should be changed every 2 years or 2000 hours, whichever comes first, using a coolant that meets ASTM D6210 specifications.
To perform a compression test, remove all injectors, attach a compression gauge to each cylinder, crank the engine, and compare readings to the manufacturer's specifications to assess engine health.
For long-term storage, clean the engine, drain and replace engine oil, add a fuel stabilizer to the tank, run the engine briefly, disconnect the battery, and cover the engine to protect it from dust and moisture.
Inspect the fuel lines, connections, and filter for signs of wear or damage. Tighten loose fittings, replace damaged hoses, and ensure the fuel filter is properly seated to prevent leaks.
Excessive black smoke may indicate an air filter restriction, fuel injector issues, or turbocharger problems. Check and replace the air filter, inspect the injectors, and ensure the turbocharger is functioning properly.
To check and adjust valve clearance, remove the valve cover, rotate the engine to top dead center on the compression stroke for each cylinder, measure the clearance with a feeler gauge, and adjust using the appropriate wrench and screwdriver.