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Repair of the T-25 tractor with the D-21 engine. Checking the cylinder head valves for leaks - 1:40 De-pressing the cylinder head valves - 3:03 Grinding the valves - 4:05 Checking the valves for leaks after grinding - 7:10 Grinding the cylinder head to the cylinders - 8:05 Installing the piston rings and their correct location - 11:00 Pressing in the piston pin without removing the connecting rod - 12:36 Thoughts on the correct installation of piston rings - 13:07 Tightening torque of the nuts on the studs of the D-21 engine using a torque wrench - 16:33 Adjusting the valve clearances. Setting the injection moment of the high-pressure fuel pump - 18:00 Replacing the problematic nipple (bypass valve) on the high-pressure fuel pump - 20:58 First start of the D-21 engine after repair - 24:25 Repair of the exhaust system (exhaust pipe) - 26:13 Maintenance of the intake system (cleaning the air filter) - 27:45 First work of the T-25 tractor after repair with a 4-row hiller on potatoes - 29:44 Overall result of the work done - 30:52 Changing the fuel line, eliminating air leaks - 33:20