![]() Turn off the ignition and disconnect the timing light and vacuum pump from the engine. Aim the timing light at the timing marks and rotate the Advance Control Knob clockwise until the timing marks are realigned to the initial (base) timing mark as recorded in step 3. Using the vacuum pump, apply the manufacturer's specified amount of vacuum to the distributor's vacuum port. Advance Control Knob Operation 30 25 A V 50 G D A N C 5 E While performing an INITIAL (BASE) TIMING CHECK as previously described, slowly increase engine speed to the manufacturer's specified rpm for mechanical/centrifugal advance, and observe the rotating timing mark for change.Ĥ. ![]() 2.ĭepending on make and model, a vehicle may be equipped with a single timing control device, or two or more devices may be used in combination. MAKE SURE the timing light is properly connected as described in TIMING LIGHT CONNECTION. You MUST consult your vehicle's service manual for the proper procedures and specifications. If these procedures are not followed, the checked or adjusted timing will not be correct. ■ INITIAL (BASE) TIMING CHECK NOTE Some ignition systems require that certain components be disconnected, jumped or grounded BEFORE ignition timing can be checked or adjusted to specifications. The label is typically located on the underside of the hood, on a fender well or valve cover, or near the hood latch. The Vehicle Emission Control Label is located under the hood in the engine compartment. Refer to the Vehicle Emission Control Label or service manual for timing procedures and specifications for your vehicle. Always prepare the engine for timing before performing a timing check. Operating controls for the Model 3551 Timing Light are shown in Figure 2.ĮNGINE PREPARATION BEFORE TIMING If applicable, check and adjust dwell to manufacturer's specifications. ■ Inductive Pickup Clip - Clamps around No. Black Battery Clip - Connects to battery negative (-) terminal or bare metal chassis ground. Rotates over approximately 90° to allow for easy illumination of timing marks in hard to reach locations. Swiveling Head - Contains the xenon bulb. Xenon Bulb - Used to illuminate timing marks for checking timing. The advance timing light provides the additional ability to check the operation of your vehicle's mechanical or vacuum advance timing controls.ġ. Your timing light provides a simple and efficient means of checking your vehicle's timing. An ignition system timing check is critical during any tuneup procedure. GENERAL INFORMATION ENGINE TIMING AND TUNE-UPS NOTE Proper ignition timing is critical in order to achieve peak engine performance and to ensure maximum fuel economy. FACTORY SOURCES Ford/GM/Chrysler/Honda/Isuzu/Hyundai/ Subaru Service Manuals Helm Inc. Be sure to include the make, model and year of your vehicle. Write to them for availability and prices. The following companies publish valuable repair manuals. VEHICLE SERVICE MANUALS Contact your local car dealership, auto parts store, bookstore or public library for availability of service manuals for your vehicle. BATTERY Fireproof Container Do not lay tools or equipment on the battery. Keep a fire extinguisher suitable for gasoline/chemical/electrical fires on hand whenever working on a vehicle. Gasoline vapor is highly flammable, and the gas formed in a charging battery is explosive. SAFETY GUIDELINES SAFETY EQUIPMENT SMOKING AND OPEN FLAMES Fire Extinguisher Never smoke while working on your car. Works on: - conventional, - electronic, - computer controlled, and - DIS* ignition systems.
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