3. Inspection and Adjustment 3.5 Adjusting the Valve Clearance Make adjustment while the engine is cold. 0 Remove the hood above the cylinder head. Turn the crankshaft to bring the piston m 3n 0 top dead center while watching the rocker arm motion, timing scale and the top mark position of the crankshaft pulley. (Position where both the intake and ex- haust valves are closed.) of the No.1 cylinder to its compression Top mark Rotatiohal direction (Notes) l The crankshaft shall be turned clockwise as seen from the radiator side. l The No.1 cylinder position is on the oppo- site side of the radiator and the ignition or- der shall be 1-3-4-2-l at 180” intervals.
l Since the intake and exhaust valve rocker arms are operated the same and there is a clearance between the arm and valve gen- erally at the top dead center, the position can be checked by means of the play when the arm head is held with a hand. Also see Valve clearance adjustment that the crankshaft pulley top mark is posi- tioned at zero on the timing scale. If there is no valve clearance, inspection in the disassembled state is necessary since the valve seat may be worn abnormally. Adjusting screw Insert a thickness gage between the Lock nut rocker arm and valve cap, and record the measured valve clearance.
(Use it as the data for estimating the wear state.) Loosen the lock nut and adjusting screw, and check the valve for any in- clination, entrance of dirt or wear. Valve clearance between the rocker arm and valve cap, and tighten the adjusting screw to ad- Insert a 0.2 or 0.3 mm thickness gage #----.I . FF Valve cap just the valve clearance. -7 R Standard valve clearance (mm) 0.15-0.25 0.25-0.35 4TNE94.98 4TNE106(T) Normal Abnormal 1 Lock nut tightening torque T=14.7-19.6 Nm (1.5-2.0 kaf*m\ 1 3-3