by Russell Krick Publisher The GoodheartWillcox Co Inc
by Russell Krick Publisher The Goodheart-Willcox Co. , Inc. Tinley Park, Illinois © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
© Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
q q q Engine tune-up General tune-up rules Tune-up safety rules Typical tune-up procedures Diesel engine tune-up (maintenance) Engine tune-up (maintenance) intervals © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
q Ensures that the engine, ignition system, fuel system, and emission control systems are within factory specifications q Recommended after a specific mileage q Refer to a service manual for the service intervals for all parts that require adjustment or replacement © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
Tune-Up Intervals © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
Minor Tune-Up q Performed on low mileage vehicles 30, 000– 40, 000 miles (48, 279– 64, 372 km) q Involves: m parts inspection m fluid replacement m filter and spark plug replacement m minor adjustments © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
Typical Tasks q q q q Visual inspection Check for diagnostic trouble codes Replace the spark plugs Check the ignition secondary components Replace the air and fuel filters Oil change and chassis lubrication Emission control system service Clean the throttle body © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
Major Tune-Up q More thorough than a minor tune-up q Performed after prolonged use q Involves: m diagnostic tests m fuel injector service m carburetor repairs m distributor rebuild © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
Typical Tasks q q q q Perform a scope analysis Test and replace the spark plug wires Test and replace the fuel pump Replace the drive belts and timing belt Replace fluids Adjust the valve train Replace weak sensors © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
q Gather information about the vehicle q Warm the engine to operating temperature q Calibrate the test equipment to ensure accuracy q Refer to a service manual and the vehicle’s emission control information sticker for specifications and procedures © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
q Use quality parts q Keep accurate service records q Lubricate hinges and latches, inspect belts and hoses, and check tire pressure © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
q Wear eye protection q Set the parking brake and block the wheels q Place the transmission in park or neutral q Place an exhaust hose over the tailpipe q Keep clothing, hands, and tools away from moving parts © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
Tune-Up Safety Rules q Disconnect the battery’s negative cable when recommended q Do not touch hot exhaust parts q Keep a fire extinguisher handy q Relieve residual fuel pressure before opening the fuel system © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
Tune-Up Safety Rules q Disable the injection pump when removing a diesel fuel injector line q Read the operating instructions for all test equipment q Never look into a carburetor or throttle body when cranking or running the engine © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
© Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
Preliminary Inspection q Battery—clean, no corrosion or damage q Air cleaner—filter, vacuum lines, and door condition q Belts—condition and tension q Fluid levels—oil, brake fluid, power steering fluid, and coolant q Hoses—condition q Electrical connections—condition © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
Air Cleaner Inspection © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
Spark Plug Replacement q Check the plug wire numbering and routing q Remove the wire from the plug by twisting and pulling on the boot q Blow debris away from the plug holes q Remove the spark plugs © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
Spark Plug Replacement q Read the spark plugs m normal brown to grayish-tan color q Replace the plugs (select the proper heat range and reach) and reconnect wires © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
Spark Plug Replacement Use a spark plug socket © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
Spark Plug Replacement Use a wire feeler gauge to gap the new plugs © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
Spark Plug Replacement Start the plugs by hand to prevent cross threading © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
Oxygen Sensor Replacement q The sensors should be replaced at periodic intervals q The sensors become coated or fouled with exhaust by-products q Fuel economy and emissions are affected © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
Oxygen Sensor Replacement q q q Disconnect the negative battery cable Unplug the connector Use a ratchet and sensor socket for removal Inspect the sensor’s condition Coat the threads of the new sensor with antiseize compound q Start the sensor by hand finish with a wrench © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
Compression Testing q Checks the mechanical condition of the engine q It is impossible to tune an engine that is not in good mechanical condition © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
Adjustments q Valve adjustment m mechanical (solid) lifters require adjustment m incorrect valve adjustment will upset the amount of air-fuel mixture pulled into the cylinder m the adjustment affects valve lift and duration © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
Adjustments q Pickup coil air gap adjustment m use a nonmagnetic feeler gauge to set the gap between the trigger (reluctor wheel) and the pickup q Idle speed adjustment m turn off all accessories m turn the idle speed adjusting screw on the throttle body or carburetor until the specified rpm is reached © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
Idle Speed Adjustment © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
Adjustments q Ignition timing adjustment m disconnect the distributor’s vacuum hose where applicable m set the computer to base timing mode m aim the timing light at the timing marks with engine idling m rotate the distributor to change timing m refer to a service manual for procedures and specifications © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
Ignition Timing Adjustment © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
© Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
Typical Tasks q q q q Replace the air filter element Clean, drain, or replace the fuel filters Adjust the idle speed Adjust the accelerator and governor linkage Inspect the engine and related systems Adjust the valve and injector timing Change the engine oil and filter Service the emission control systems © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
q Specific periods (in miles or months) for component service q Given in the vehicle’s service manual © Goodheart-Willcox Co. , Inc. Permission granted to reproduce for educational use only
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