OEM Dodge Viper Exhaust Valve

Dodge Viper Exhaust Valve Parts and Q&A

• Exhaust Valve
  5037890AA
  Q: How to Service and Repair Exhaust Valve and Intake Valves on Dodge Viper?

  A:

  Service and repair of valves should start with inspecting the valve face and seat angles as laid out in the Engine Specifications section of your vehicle's manual. Check what margin you have left after refacing the valves. While refacing a valve seat, always choose the proper valve guide pilot to support the stones correctly for a truly flat and complete surface. Use a dial indicator to ensure that the runout between the valve seat and the cylinder is not more than 0.051 mm (0.002 inch). Lightly paint the valve seat contact with Prussian blue, arrange the valve gasket over it and gently spin the valve until the seat makes contact. A blue transfer in the middle of the valve face means that contacts are working properly. When the damage appears at the top edge, grind up with a 30-degree stone; when it shows at the bottom edge, lower the seat with a 75-degree stone. If worn or burned valve seats are restored and kept to the same angle and width, everything can be rebuilt; however, if not, the whole cylinder head must be changed. With the seat in the right position, each seat should measure 1.02 to 1.52 mm (0.040 to 0.060 inch) across. Before installing the valves, rub the stem of each with engine oil and then insert them into the correct holes in the cylinder head. When the valves or seats have been reground, make sure to measure the valve tip height and the valve spring installed height. Should the valve tip be above 49.53 mm (1 61/64 inch), simply grind it down so it matches the proper size, checking once more from the surface of the cylinder head to the tip of the valve stem. Lift and place valve spring seats over the valve guides and then install new valve stem seals, plus the valve springs and valve retainers. Use your valve spring compressor to compress the valves, set the locks in place and get rid of the tool. If valves and seats are reground, ensure you measure the height of each spring by placing the gauge along the center of the seat and measuring to the underside of the retainer. Should the height be greater than 42.65 mm (1.670 inch), add a 0.794 mm (1/32 inch) spacer to the counter-bore under the valve spring seat to make the spring height range from 41.85 to 43.44 mm (1.648 - 1.710 inch).
• Exhaust Valve
  5037719AC
  Q: How Do Exhaust Valves and Intake Valves Impact Refacing Procedures and Specifications on Dodge Viper?

  A:

  There is a 44.5-45° face angle on the intake and exhaust valves as well as on the valve seats. After replacing the valves, check the safety margin around the valves according to engine guidelines. Using the appropriate size valve guide pilot is necessary during valve seat refacing so the stones reseat properly and provide a true and complete surface. See if the valve seat is concentric by reading the dial indicator, as the maximum for total indicator reading should be 0.051 mm (0.002 in.). Little Prussian blue on the valve seat, seat the valve and rotate it gently; if blue comes to the center of the valve face, the contact is proper. Move the valve to adjust for the blue and whether it moves up or down your seat will be set accordingly with a 30° or 75° stone. When the seat angle and width are okay, problematic valve seats can still be fixed; if not, you need a new cylinder head. The width of each seat should measure 1.02 - 1.52 mm (0.040 - 0.060 in.) when the seat is positioned correctly.