Genuine Nissan Quest Valve Stem Oil Seal

Nissan Quest Valve Stem Oil Seal Parts Questions & Answers

• Seal-Oil,Valve
  13207-0B010
  Q: Can broken valve springs and defective valve stem seals be replaced without removing the cylinder heads on Nissan Quest?

  A: Broken valve springs and defective valve stem seals can be replaced without removing the cylinder heads, typically requiring two special tools and a compressed air source. Begin by removing the valve cover(s) and the Rocker Arm assembly, followed by the lifter assembly. Remove the spark plug from the affected cylinder, or all if replacing all valve stem seals. Turn the crankshaft until the piston in the affected cylinder is at Top Dead Center on the compression stroke, starting with cylinder number one and working through the firing order. Thread a long adapter into the spark plug hole and connect an air hose from a compressed air source. Apply compressed air to the cylinder, taking care as the piston may be forced down, potentially causing the crankshaft to turn suddenly. Stuff shop rags into the cylinder head holes around the valves to prevent parts from falling into the engine, then use a valve spring compressor to compress the spring and remove the valve stem locks. Inspect the valve stem for damage, ensuring it doesn't bind in the guide. Reapply air pressure to retain the valve in the closed position, lubricate the valve stem with engine oil, and install a new valve stem seal, ensuring intake and exhaust seals are not mixed. Install the inner and outer springs over the valve, followed by the valve spring retainer, compressing the springs to position the valve stem locks. Remove pressure from the spring tool, disconnect the air hose, and remove the adapter. Reinstall the lifter assembly and rocker arm assembly, followed by the valve cover and spark plug(s). Start the engine and check for oil leaks and unusual sounds from the valve cover area.