OEM Chrysler LHS Intake Valve

Chrysler LHS Intake Valve Parts and Q&A

• Intake Valve
  4663836
  Q: How to Service and Repair Exhaust Valve and Intake Valves on Chrysler LHS?

  A:

  Before starting to service valve seats, check how much material is left after you have refaced the valves. Use the proper pilot when refacing seat valves to help stones be seated accurately and completely on the valve seats. Place a dial indicator on the valve seat and confirm that the spin-out does not go above 0.051 mm (0.002 inch). Try staining the seat with Prussian blue, setting the valve on it and turning it with your fingers; when the blue spreads to the middle of the valve face, you know there is proper contact. If the dye appears at the top, raise the valve seat with a small stone; if it's on the bottom, lower the valve seat with a large stone. If the proper width and angle of the valve seat are not maintained, the cylinder head can't be repaired and needs to be changed. Intake seats should measure between 0.75 and 1.25 mm (0.0296 to 0.0493 inch) and exhaust seats should be 1.25 to 1.75 mm (0.049 to 0.069 inch) wide. Cover the valve stems in clean oil and place them into the cylinder head. When you reface valves or seats, the valve tip's height should not exceed 43.65 mm for intake or 45.98 mm for exhaust; if it's higher, grind it down. Place the valve seal/spring seat assembly on every valve stem, making sure the garter spring is still present around the top of the rubber seal. Fit the valve springs, with the marked end up and the valve retainers into place on the spring seat. Work the valve springs in towards the piston using a compressor, slide the locks into place and let go of the tool. If a valve or seat has been refaced, check that the springs are measured at 38.75 mm (1.5256 inch) or less from top to bottom, since exceeding this distance could cause problems; if they are higher, use a 0.762 mm (0.030 inch) spacer found in the head counterbore under the valve spring seat to achieve the correct spring height.