In general , the following is another technique in adjusting valve clearance.
As the car engine aged, there is a possibility that the clearance between the tip of the valve step and the rocker arm becomes bigger than the required clearance.
If this happens you can hear a clicking sound while engine is running
the following as some principles in valve adjustments and some definition of terms.
1. newer cars nowadays , with four piston has normally 4 valves in one piston. Two intake valves, and two exhaust valves or a total of 16 valves . One of the two valves is the main valve, its mate is a secondary valve.
2. VALVES - it looks like a big NAIL , with a stem measuring about the size of a cigarette about 3 to 4 inches in height, its end is circular about inch in diameter.
3. INTAKE VALVES - this valve opens when the piston is at the downward stroke (INTAKE STROKE) to give way for the fuel air mixture to enter the combustion chamber. The stem of the valve is pushed down by the tip of the rocker arm .
4. EXHAUST VALVES. this valves opens at the exhaust stroke of the piston to give way for the fumes to get out of the combustion chambers.
5. ROCKER ARMS . - it pushes the tip of the valve to open, the center of the s rocker arm has a hole where the rocker arm shaft is inserted
6. CAMSHAFT- This is located in between the INTAKE ROCKER ARM SHAFT AND THE EXHAUST ROCKER ARM SHAFT. It has a camlobes or a protruded part where the other end of the rocker arm is touching. this motion causes the rocker arm to push the tail end of the valves..
7. INTAKE MANIFOLD - this is where the air component of air fuel mixture passes thru. This where the cable linkage of your accelerator is connected.
8. EXHAUST MANIFOLD - this where the fumes , as a result of the explosion in the combustion chamber passes thru leading to the tail pipe.
PRINCIPLES IN ADJUSTING VALVES.
1. BASICALLY , The valves to be adjusted FIRST are those in the number one piston since this is the first to FIRE. . This piston must be at the FIRING STROKE and the intake valves and the exhaust valves are closed. that means that no air can escape inside the combustion chamber to give better compression.
2. Of course the next to be adjusted is in the third piston , that is if the FIRING ORDER OF THAT ENGINE IS : FIRST is the NUMBER ONE PISTON , 2nd is the THIRD PISTON , 3RD , is the FOURTH PISTON , and last is the 2ND PISTON. In short 1. 3..4..2 sequence of firing order. If the firing order is 1, 2, 4, 3. then follow that sequence.
HOW TO LOCATE THE INTAKE AND THE EXHAUST VALVE.
if the intake manifold and exhaust manifold of your engine is located in different location, the INTAKE VALVES are those in the side of the intake manifold.
the exhaust valve therefore are those in the side of the exhaust manifold.
In the case of an engine where the intake and exhaust are in the same position, the intake valves are those in the side of the port of the intake manifold.
THE ACTUAL ADJUSTMENT OF VALVES.
1. remove the valve cover so that the whole assembly can be accessible.
2. remove the distributor cap.
3. remove the spark plug for an easy engine rotation.
4. using a socket wrench , rotate the engine clockwise ( if this is the its normal rotation of the engine) counterclockwise ( if it is its normal rotation ) . to be able to know it , you must first crank the engine while looking at the crankshaft pulley if what way it rotates.
5. continue rotating the crankshaft untill the INTAKE ROCKER ARM OF THE NUMBER FOUR PISTON IS ABOUT TO GO DOWN. STOP. In this position, the number one PISTON is at FIRING ORDER. meaning the rocker arm of this piston must be adjusted. At this point the rotor of the distributor is facing the port where the spark plug for number 1 piston is positioned.
6. check if the timing mark in the camshaft pulley is in line with another mark near the that mark OR check if the timing mark of the crankshaft pulley ( A NOTCH in it ) is in line with the corresponding notch or mark on the TIMING COVER near the pulley . In the time cover may appear, 0, TDC.
7. If not in line, rotate further.
8. at this point, you will notice that INTAKE AND EXHAUST VALVE of number one piston are both in upward position because they went up to close itself in the combustion chamber . if you try to have it moved by your hand , it must be moving , the intake valve of number two piston could also be moved, the exhaust valve of number 3 piston could also be moved. WHILE , the intake valve of number 3, the intake of number 4, the exhaust of number 2, and the exhaust of number 4, cannot be moved.
9. now , insert the the feeler gauge with the size corresponds to the specification of your engine to the intake valve of number one piston. example if it is 0.007 inch.
10. loosen the the nut, then insert the feeler gauge, put the a box wrench on the nut, using a screw driver, tighten the bolt while holding firmly the box wrench ,until you feel that the feeler gauge can be tightly be moved back and forth .\
11. tighten the nut, then try to insert the feeler gauge if the clearance is ok. the feeler gauge can be inserted , if it cannot be inserted then , repeat the procedure.
12. next is to adjust the exhaust valve, similar to the manner you use in intake valve except that it has a different size of clearance.
13. next , rotate again the pulley until the INTAKE ROCKER ARM OF NUMBER TWO PISTON IS ABOUT TO GO DOWN. at this point the rotor is facing the port of the spark plug for number three piston.
14. adjust the intake and exhaust of number three piston.
15, rotate again, untill the INTAKE ROCKER ARM OF NUMBER ONE PISTON is about to go down. at this point the rotor is facing the port leading to the number four piston.
16. adjust the intake and exhaust of NUMBER FOUR PISTON.
17. rotate again, until the intake rocker arm of number THREE PISTON IS ABOUT TO GO DOWN. at this point the rotor is facing the number two spark plug cable.
18. adjust the intake and exhaust of NUMBER TWO PISTON.
NOTE: EVERY TIME YOU ARE GOING TO ADJUST A VALVE OF A CERTAIN PISTON, THE CORRESPONDING ROTOR in the distributor FOR THAT PISTON should be in line with the SPARK PLUG CABLE POST in the distributor. Example , if the valve to be adjusted is those of NUMBER THREE PISTON, THE ROTOR of the distributor must be pointing the distributor post where the spark plug goes to the spark plug of number three piston.
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