Loosen the distributor hold-down clamp by turning its bolt counterclockwise. If it is not, turn the engine off and proceed to the next step to adjust your timing. If the pointer is pointing at the correct mark, you do not need to adjust your timing. Because of this, the timing marks will appear to be standing still. Aim the timing light at the timing marksĪim the timing light at the timing marks, and press the button on the light. Then, on the side of the distributor, disconnect the rubber hose from the vacuum advance and put a piece of duct tape on the end of the hose to seal it off. If you want, you can use some chalk to mark the timing marks to make them more visible. Now, your timing marks will have a line labeled "0" with marks above and below it, and depending on which way the wheel rotates, you will see the lines before the "0" (BTDC), or after the "0" (ATDC). There is also an "ATDC." "Before Top Dead Center" and "After Top Dead Center" - top dead center is the point where the piston reaches the highest point in the cylinder and that is when the compression is the greatest. As you can see, it also says something about "BTDC" for this Ford. All this means is that you want to line up the pointer on the timing light with the 6° timing mark when the engine is idling in gear at 550 rpm. For example, a 1969 Ford 429, it's 6 Degrees BTDC 550 rpm in drive gear - with automatic trans. Your auto's spec or emissions placard sheet should tell you what your timing degree should be. Look to the auto's spec or emissions placard sheet Rotate the pulley, if necessary, so that you can see the mark. Locate the timing marks near the lower crankshaft pulley, and the mark on the pulley itself. Clamp the largest clipĬlamp the largest clip (the one with the thickest insulation) around the No. Clamp the black clipĬlamp the black clip to the negative terminal of your car battery. Test the dizzy and pull on the throttle linkage to make sure the car engine does not sputter and come back to the normal smooth running and recheck the timing with the gun.Clamp the red clip on the timing light to the positive terminal of your car battery. If everything is fine then lock down the 1/2 bolt. It takes a small amt of turning the entire dizzy to accomplish this adjustment. So but advancing or retarding the whole dizzy assembly the engine and timing will advance so the mark is at the pointed or retard the unit to get the mark and pointer to line up. This entails loosening the hold down bolt to the distributer with a 1/2 inch socket. If the line and light do not match up then you need to time the engine to get it to run smoother. Keep the trigger pulled and every time the light blinks it should light up the lower pulley and the white mark should be at the metal arrow or pointer on the front of the crankcase. Point the gun with the bulb down towards the lower pully but be careful not to go to far as to hit the fan blades while they are turning. I time my car off of number 6 sparkplug wire. Pull the trigger on the gun and the light should blink. The car should be running smoothly and not at a fast idle. My 39 Desoto is set at 2 degrees before TDC or the zero line.Ĭonnect the two alligator clips to the appropriate contacts. sand off the grud so you can see the timing lines then use use white paint to mark the appropriate line. But prior to starting the engine you will need to mark the appropriate timing mark on the lower pully. The engine has to be running at idle speed. But how do you use it? The flashes correspond to the white marking? When they line up it's good? How to adjust till they do?īingster.
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