NOTE: If the timing fluctuates or changes, terminal D is not properly grounded to terminal D. Use the timing light to read the ignition timing by pointing the light at the timing marks (located on the crankshaft pulley and timing belt cover tab) and pulling the light’s trigger.Start the engine and allow it to idle.Grounding terminal C to terminal D will fix the ignition timing (prevent the timing from moving). Remove the cover from the monitor connector, located beside the right-hand head light assembly, and, using a jumper wire, connect terminals C and D.If it is not, adjust the idle speed prior to adjusting ignition timing. Check the idle speed to ensure that it is 800 rpm.This will ensure that the engine is properly warmed up. Turn off the engine, turn the ignition switch ON for 5 seconds, then start the engine again and run it at 2000 rpm for 5 minutes.Shut the engine OFF, then remove the inductive timing light from the vehicle.After adjusting the ignition timing and tightening the distributor flange bolts, recheck the ignition timing to ensure that it did not change while tightening the distributor flange bolts.5: To adjust the ignition timing, rotate the distributor housing counterclockwise to advance timing and clockwise to retard timing Tighten the distributor flange bolt(s) securely.įig. Turn the distributor counterclockwise to advance, and clockwise to retard the ignition timing. To adjust the ignition timing, loosen the distributor flange bolt(s) and rotate it until the proper ignition timing is within specifications.If the ignition timing, is not 8 degrees BTDC at 750–850 rpm engine speed, adjust the timing.Do not wear loose clothing when working around a running engine, otherwise personal injury or death may result. When using the timing light, be sure to keep yourself and all tools away from moving and hot engine components. The ignition timing marks are located on a tab attached to the engine The timing light input lead should always be attached to the No. Install the inductive timing light according to the manufacturer’s instructions.Check the idle speed to ensure that it is 750–850 rpm.Apply the parking brake and place the gearshift in Neutral (manual transmissions) or Park (automatic transmissions).If equipped, ensure that the air conditioning is OFF. Be sure that all of the electrical loads, except for the ignition switch, are OFF.Start the engine and allow it to warm up to normal operating temperature.Ignition Timing (deg) Automatic Transmission Keep in mind that this timing diagram is only used to explain the principles of operation and the general timing of these events in relationship to the position of the crankshaft.Ignition Timing (deg) Manual Transmission Although each point on the timing diagram is just an example, all four-stroke events generally occur somewhat near the points shown. The exhaust stroke continues to about 10 degrees BTDC at which time the cycle starts all over again. The power stroke goes to about 12 degrees BBDC. The compression stroke then continues to the ignition point, about 15 degrees BTDC. To begin, the intake valves open about 10 degrees BTDC. During the four cycles of operation, the crankshaft revolves two complete revolutions or 720 degrees of rotation. Two circles are shown to represent two complete revolutions of the crankshaft. The mark at the bottom of the graph would illustrate the position of the piston at BDC. Any event that happens after top dead center is called ATDC or after top dead center. Any event that happens before TDC is referred to as BTDC or before top dead center. For example, at the top of the diagram, the piston would be located exactly at TDC (Top Dead Center). One way to look at this diagram is to think of these events in terms of the position of the crankshaft and 360 degrees rotation. The diagram is set on a vertical and horizontal axis. Describing the Principle: A timing diagram is a method used to identify the time at which all of the four stroke events occur on a typical four-stroke engine.
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