Jet Valve Adjustment
- Before beginning adjustment, note the following:
- Misadjusted jet valve clearance will adversely affect emission levels.
- Adjust jet valve clearance before adjusting intake valve clearance.
- Before adjusting jet valve, retighten cylinder head bolts (cold) to 51-54 ft. lbs. (7-7.5 mkg) on 1400 and 1600 cc engines or 65-72 ft. lbs. (9-10 mkg) on 2000 and 2600 cc engines.
- Adjust jet valve clearance with intake valve adjusting screw fully loosened.
- With engine at normal operating temperature, stop engine, remove rocker cover and position appropriate piston at TDC of compression stroke.
- Back off intake valve side adjusting screw 2 or more turns. Loosen lock nut on jet valve adjusting screw.
- Back off jet valve adjusting screw (counterclockwise) and place 0.006" (0.15 mm) feeler gauge between top end of jet valve stem and bottom end of adjusting screw. Fig 2.
- Turn down adjusting screw (clockwise) until proper clearance is obtained.NOTE: Tensile strength of jet valve spring is weak. Use care during adjustment not to force screw to turn, putting excess pressure on spring.
- Hold adjusting screw and tighten lock nut. Recheck clearance. Adjust intake valve clearance to 0.006" (.15 mm). Repeat adjustment at each cylinder.