How to Perform a Valve Job


Below guide will teach you How to Perform a Valve Job. Please follow the instructions carefully.

Things You’ll Need:

  • Screwdriver
  • Socket and Ratchet Set
  • Standard Hammer
  • Needle Nose Pliers
  • 3/8 in. Drive Ratchet
  • Exhaust Valve
  • Intake Valve
  • Valve Spring Compressor

Estimated Costs:

  • DIY Costs: Est. $55.50 parts only
  • Shop Costs: Est. $737.42 parts and labor

Instructions:

  • Park the vehicle on a level surface and prop the engine hood up.
  • Detach the negative battery cable from the negative terminal.
  • Put the drain pan under the radiator drain plug and unplug the radiator drain plug.
  • Let the antifreeze agent drain out completely.
  • Take the air filter and air intake system out. Also, detach all the rubber vacuum hoses.
  • Detach all the linkages or cables connect on the top of the engine.
  • Now, look for the vehicle’s intake manifold.
  • Discard all the pipes, linkages, or hoses which are connected to the intake manifold.
  • Now, using appropriate tools, unfasten all the mounting bolts holding the intake manifold in place.
  • Take the intake manifold out of the vehicle.
  • Wipe off any debris, dirt or any other contaminants gathered on the mounting surfaces.
  • Now, you need to approach the valve covers.
  • Take the valve covers away. Also, remove the exhaust manifold.
  • Look for the vehicle cylinder head. You need to refer to the manufacturer’s suggested sequence to unfasten the cylinder head bolts.
  • Pull the cylinder head watchfully from the engine compartment. Make sure that the cylinder head doesn’t sustain any damage on its surface.
  • The cylinder should be steam cleaned. Then, dismantled the head and thoroughly examine it.
  • Using magnaflux test, examine the cast iron head for any cracks. This is a test which makes use of magnetic field and iron powder to locate the cracks.
  • Also, examine the straightness of the head as well. You can use a straight edge and feeler gauge to examine the straightness of the head. Replace or resurface if necessary.
  • Examine the valve guides, seats and valves. Valves guides often receive damage and require to be changed.
  • Next, examine the valve seats for any signs of wear and tear. Minor damage can be rectified by resurfacing the seats. However, severe damage means to replace the seats.
  • Now, examine the valves for any signs of damage like cracks, bending, overheating etc. If the damage is not severe, you can reuse them otherwise replace them with new ones.
  • Apart from these, you need to thoroughly check valve springs, push rods, lifters and rocker arms. Make sure that all the parts are free from wear and tear and can be reused. Replace any damage parts with new units.
  • Once everything is examined carefully and damaged parts are replaced with new ones, reassemble the cylinder head into the vehicle by reversing the whole process.
  • Take a solution of coolant and distilled water and add it to the radiator.
  • Make sure that the solution will reach up to the MAX mark in the radiator.
  • Before recapping the radiator, switch the engine on and let it run in an idle state for some time. Switch the engine off and check the coolant level again in the radiator. Add more coolant mixture if needed. Recap the radiator.
  • Take a small drive and verify the valve job.

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