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What are the head torque specs for a 2004 chevy aveo

Customer Question

what are the head torque specs for a 2004 chevy aveo
Submitted: 7 years ago.
Category: Chevy
Expert:  hondatrx450 replied 7 years ago.

Hi here are the specs you need thanks mike.


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  1. The cylinder head should be cleaned and inspected prior to installation.
  2. Lightly oil all bolt and stud bolt threads before installation.
  3. Clean all gasket mating surfaces thoroughly.
  4. Install a new head gasket on the cylinder block. WARNING Always use new cylinder head bolts when installing the cylinder head or damage to the engine may occur.
  5. Install the cylinder head on the cylinder block.
  6. Tighten the cylinder head bolts in reverse of the removal sequence. Tighten the 2004 cylinder head bolts to 18 ft. lbs. (25 Nm). Tighten an additional 70°, plus 70°, plus another 50°. Tighten 2005 bolts to 18 ft. lbs. (25 Nm). Tighten an additional 60°, plus 60°, plus another 10°.
  7. Install the right engine mount. Tighten the engine mount attaching bolts to 22 ft. lbs. (30 Nm).
  8. Install or connect the following:
    • Intake manifold
    • Intake manifold support bracket. Tighten the bolts to 18 ft. lbs. (25 Nm).
    • Throttle cable
    • Surge tank coolant hose
    • Heater hose to cylinder head
    • Fuel feed line at the fuel rail
    • All vacuum hoses
    • Exhaust manifold
    • Rear timing belt cover
    • Timing belt tensioner. Tighten the bolts to 18 ft. lbs. (25 Nm).
    • Idler pulley. Tighten the bolts to 18 ft. lbs. (25 Nm).
    • Intake and exhaust camshaft gears. Tighten the bolts to 49 ft. lbs. (68 Nm).
  9. Apply a small amount of gasket sealant to the corners of the front camshaft caps and the top of the rear camshaft cover-to-cylinder head seal.
  10. Install the valve cover using a new gasket
  11. Align the timing marks on the camshaft gears.
  12. Align the mark on the crankshaft gear with the notch at the bottom of the rear timing belt cover.
  13. Install the timing belt and rotate the water pump clockwise to apply tension to the timing belt.
  14. Tighten the water pump bolts to 89 inch lbs. (10 Nm).
  15. Adjust the timing belt tension.
  16. Install or connect the following:
    • Spark plug wires
    • Upper and lower timing belt coversCrankshaft pulley. Tighten the bolt to 70 ft. lbs. (95 Nm), plus an additional 30°, then another 15°.
    • Accessory drive belt
    • Air cleaner housing
    • Radiator hoses
    • Front splash shield
    • Right front wheel
    • Coolant temperature sensor
    • Fuel feed line from fuel rail
    • IAT sensor
    • Intake manifold pressure sensor
    • DIS coil connector
    • Fuel injector connectors
    • ECM ground terminal
    • Negative battery cable
  17. Fill the engine with oil and coolant.
  18. Start the engine and check for leaks.