4G6 ENGINE <1992> - Cylinder Head and Valves - DOHC
1 IC-83
VALVE SEAT REPLACEMENT PROCEDURE (1) Refer to Page 1 IC-77 noting that the only difference is in the reboring size. Intake valve seat hole diameter 0.3 mm (.012 in.) O.S. . . . . . . . . . . . . . . . . . . . . 35.30- 35.33 mm (1.3898 - I .3909 in.) 0.6 mm (.024 in.) O.S. . . . . . . . . . . . . . . . . . . . . 35.60 - 35.63 mm (1.4016- 1.4028 in.) Exhaust valve seat hole diameter 0.3 mm (.012 in.) O.S. . . . . . . . . . . . . . . . . . . . . 33.30- 33.33 mm (1.3110- 1.3122 in.) 33.60- 33.63 mm . . . . . . . . . . . . . . . . . . . . 0.6 mm (024 in.) O.S. (1.3228- 1.3240 in.)
VALVE GUIDE REPLACEMENT PROCEDURE (1) Refer to Page 11 C-77, noting that there are differences in the diameter of the valve guide hole as well as in the guideâ&#x20AC;&#x2122;s installed height. Valve Guide Hole Diameter 0.05 mm (.002 in.) O.S. . . . . . . . . . . . . . . . . 12.05 - 12.07 mm (.4744 - .4752 in.) 12.2512.27 mm . . . . . . . . . . . . . . . . 0.25 mm (.OIO in.) O.S. (.4823 - 4831 in.) 0.50 mm (.002 in.) O.S. . . . . . . . . . . . . . . . . 12.50- 12.52 mm (.4921- .4929 in.)
INSTALLATION SERVICE POINTS +A4 VALVE STEM SEAL INSTALLATION Valve seat
I
6EN020!
(1) Install the valve spring seat. (2) Using the special tool, install a new stem seal to the valve guide. Caution Do not reuse the valve stem seal.
h
I)B4 VALVE SPRING INSTALLATION Identificationcolor
(1) Install the valve spring so that its end with identification color is positioned on the rocker arm end.
TSB Revision