Valve Clearance: Adjustments
INTAKE & EXHAUST VALVESFig. 12 Adjusting valve clearance (Typical):
The jet valve must be adjusted before adjusting the intake valve.
1. With engine at operating temperature, remove rocker arm cover.
2. Disconnect high tension lead from ignition coil.
3. While observing rocker arms on No. 4 cylinder, rotate crankshaft until the exhaust valve is closing and the intake valve has just started to open with crankshaft pulley mark aligned with TDC mark on timing chain case. At this position the No. 1 cylinder is at top dead center compression stroke. Check and adjust valve clearance for both intake and exhaust valves of No. 1 cylinder, intake valve of No. 2 cylinder and exhaust valve of No. 3 cylinder, as necessary, Fig. 12.
4. Rotate crankshaft 360 degrees and check and adjust valve clearance for exhaust valve of No. 2 cylinder, intake valve of No. 3 cylinder and intake and exhaust valves of No. 4 cylinder.
5. After completing adjustment, install rocker arm cover and connect ignition coil high tension lead.
JET VALVE
Fig. 13 Adjusting jet valve clearance:
Exc. Models Equipped W/Hydraulic Lash Adjusters
Following procedure for intake and exhaust valve adjustment, position No. 1 cylinder at top dead center compression stroke. Loosen intake valve adjusting screw at least 2 turns, then loosen jet valve adjusting screw locknut. Rotate jet valve adjusting screw counterclockwise and insert a suitable feeler gauge blade as specified in ``Valve Specification Chart,'' between jet valve stem and adjusting screw, Fig. 13. Tighten jet valve adjusting screw until it contacts the feeler gauge blade, then while holding adjusting screw in position, tighten locknut. After jet valve adjustment has been completed, adjust intake valve clearance. Continue to follow intake and exhaust valve adjustment procedure and adjust jet valves as necessary.