Fig. 109: Measurement of Valve Seat Runout
Courtesy of CHRYSLER LLC
2. Measure the concentricity of valve seat using dial indicator . Total runout should not exceed 0.051 mm
(0.002 in.) total indicator reading.
3. Inspect the valve seat using Prussian blue to determine where the valve contacts the seat. To do this, coat
valve seat
LIGHTLY
with Prussian blue then set valve in place. Rotate the valve with light pressure. If
the blue is transferred to the center of valve face, contact is satisfactory. If the blue is transferred to top
edge of valve face, lower valve seat with a 15 degree stone. If the blue is transferred to the bottom edge of
valve face raise valve seat with a 65 degrees stone.
4. When seat is properly positioned the width of intake and exhaust seats should be 1.50-2.00 mm (0.059-
0.078 in.) .
Fig. 110: VALVE INSTALLED HEIGHT
Courtesy of CHRYSLER LLC
5. After grinding the valve seats or faces, install the valve in cylinder head and check valve installed height
1 - DIAL INDICATOR
NOTE:
Valve seats which are worn or burned can be reworked, provided that
correct angle and seat width are maintained. Otherwise cylinder head must
be replaced.
1 - SPRING RETAINER
2 - VALVE INSTALLED HEIGHT* - 48.1-49.7 mm (1.89-
1.95 in.)
3 - CYLINDER HEAD SURFACE
4 - SPRING INSTALLED HEIGHT* - 41.1-42.7 mm (1.61-
1.68 in.)
*(MEASURED FROM TOP OF SPRING SEAT)
2010 Jeep Wrangler Sport
2010 ENGINE 3.8L - Service Information - Wrangler
viernes, 1 de octubre de 2021 05:18:30 p. m.
Page 84
© 2011 Mitchell Repair Information Company, LLC.
