Manifolds, Cylinder Head & Valves

d)Check the valve lever bracket for wear in the bore.

e)Replace valve rocker arms that show excessive wear of hammering at the ends (2-3) which contact the valve, remove only enough material to give an even face on the end of the valve lever and take care that the rounding is maintained lengthwise to ensure perfect grinding action on valve stem.

Tightening sequence for 4 Cylinder Engines

4

Tightening sequence for 3 Cylinder Engines f)Check expansion plugs on both ends of the lever shaft for leakage and replace plugs, if necessary, using sealer. g)Check valve lever springs against specifications and replace with new ones if signs of corrosion chafing or fatigue show.

NOTE: Replace worn screw & nut with new ones.

3d.ASSEMBLY : a)Position the shaft in the center bracket ensuring that the oil hole in the shaft is towards the bottom of the bracket. Secure it with a new groove pin. b)Assemble rocker arm spacer, rocker arm, spring rocker arm bracket, rocker arm to the shaft and secure them with a washer and retaining ring.

Engine valve rocker arm (Ref. Fig .7).

3e.INSTALLATION : a)Loosen the lock nuts on each valve lever and back off the adjusting screws. b)Install the value rocker arm shaft assembly on the studs as shown in Fig. 7 and install the nuts (1-3) finger tight. c)Install the bolt in the centre bracket then tighten the nuts to the correct torque. d)Adjust the valve clearance as detailed in para “ADJUSTMENTS”. e)Install the valve housing cover using a new gasket and rubber washers. f)Install the nuts over the clamps/stiffener (over valve housing). Then tighten them to the specified torque.

3f.ADJUSTMENTS : a)Tappet clearance must be set after the cylinder head cap screws have been tightened to the correct torque. b)Move each piston in the firing order to top dead center on the compression stroke. This can be ascertained by watching the valves of No.4 cylinder until intake valve just beginning to open and