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Post by Pardee on Jun 25, 2014 12:54:09 GMT -5
Improper valve clearance causes poor engine performance and possible engine damage. If there is too little clearance, the valve is held partially open. This permits blowby past the valve and a drop in compression. If there is too much clearance, there will be excessive engine noise and the valve will not open fully, which will cause partial blockage of airflow at the port.
| - Remove the alternator cover and plug.
- Next, align the "T" mark on the rotor with the timing plate on the field coil assembly. This places the pistons at top dead center. One of the cylinders is now at the top of its compression stroke. The cylinder that is on the compression stroke has both valves shut. This can be noted by observing which cylinder has clearance at both valve adjusters.
- Use a feeler gauge to determine the existing clearance. The exhaust valve clearance should measure 0.05mm (0.002"). The intake valve clearance should measure 0.05mm (0.002"), (engine cold).
- Loosen the lock nut and use the valve adjusting tool found in the Special Tool kit. Turn the adjustor in or out to obtain the correct clearance. Hold the adjustor solid to prevent it from moving and thoroughly tighten the lock nut. Recheck the clearance after tightening. Tightening torque is 2.5~2.8 kg-m (225~252 in-lbs.)
- Rotate the crankshaft one complete revolution and once again line up the rotor mark with the field coil assembly timing plate. The valve train of the other cylinder is now in position for adjustment.
CAUTION: ADJUST VALVE CLEARANCE ONLY WHEN THE ENGINE IS COLD.
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