Valves, Guides And Springs: Inspection
WARNING: This page is about a different car, the 2012 RAM Pickup and 2012 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
Visually inspect the valves for abnormal wear on the heads, stems, and tips. Replace any valve that is worn out or bent.
VALVE STEM DIAMETER SPECIFICATIONS
| VALVE STEM DIAMETER |
| 6.96 mm (0.2740 in.) MIN |
| 7.010 mm (0.2760 in.) MAX |
Measure the valve stem diameter in three places as shown in illustration.
VALVE GUIDE BORE SPECIFICATIONS
| VALVE GUIDE BORE SPECIFICATIONS | |
| Valve guide bore diameter | |
| Min. | 7.027 mm (0.2767 in.) |
| Max. | 7.077 mm (0.2786 in.) |
| Installed valve guide depth | |
| Intake | |
| Min. | 0.584 mm (0.023 in.) |
| Max. | 1.092 mm (0.043 in.) |
| Exhaust | |
| Min. | 0.965 mm (0.028 in.) |
| Max. | 1.473 mm (0.058 in.) |
Measure the cylinder head valve guide bore.
VALVE MARGIN (RIM THICKNESS) SPECIFICATIONS
| VALVE MARGIN (RIM THICKNESS) |
| 0.79 mm (0.031 in.) MIN. |
Measure valve margin (rim thickness).
ALVE SPRING FREE LENGTH & INCLINATION SPECIFICATIONS
| APPROXIMATE VALVE SPRING FREE LENGTH |
| 47.75 mm (1.88 in.) |
| MAX INCLINATION |
| 1.5 mm (.059 in.) |
Measure the valve spring free length and maximum inclination.
| 1 - SPECIAL TOOL C-647 |
Test valve spring force with tool (special tool #C-647, Spring Tester) (1). Specification 72.0 - 80.7 lbs. when compressed to 35.33 mm (1.39 in.).