OPERATIONAL PERFORMANCE TEST / Engine Test VALVE CLEARANCE Summary: 1. Perform the measurement when the engine is cold. 2. Before starting any work, clean the head cover mounting area and avoid contamination in the engine. Preparation : 1. Disconnect the connector of inject. 2. Remove the leak off hose. 3. Remove the head cover. 4. Rotate the crank pulley. Align the top dead center (TDC) mark on crank pulley with the top mark lo- cated on timing gear case. Injector T1T1-04-03-001 Leak Off Hose NOTE: When rotating the crank pulley, remove the fan guard. Then, rotate the fan while hold- ing the fan belt. If it is difficult to rotate, re- move all glow plugs and release compres- sion pressure.
5. Check if piston No.1 (or piston No.4) is now posi- tioned at the TDC in the compression stroke. Crank Pulley NOTE: Move push rods for the intake and exhaust valves on the No.1 cylinder up and down by hand. If any clearances on the both ends of the push rods are found, piston No.1 is positioned at TDC in the compres- sion stroke. (If the exhaust valve of cylinder No.1 is pushed down, piston No.4 is posi- tioned at TDC in the compression stroke. 6. Start measurement from the cylinder (No.1 or No.4) positioned at TDC in the compression stroke. Top Mark T1T1-04-03-003 TDC Mark T4-3-4