Viper V10-488 8.0L (1992)
Valve: Testing and Inspection
VALVE INSPECTION
1. Clean valves thoroughly and discard burned, bent, warped and cracked valves.
2. Measure valve stems for wear. Refer to specifications.Valve stems are chrome plated and should not be polished.
3. Remove carbon and varnish deposits from inside of valve guides with a reliable guide cleaner.
4. Measure valve stem guide clearance as follows:
a. Install valve into cylinder head so it is 14 mm (.551 inch) off the valve seat. A small piece of hose may be used to hold valve in place.
b. Attach dial indicator Tool C-3339 to cylinder head and set it at right angle of valve stem being measured.
c. Move valve to and from the indicator. Refer to specifications. If guides are out of specifications ream to next oversize. Ream the guides for
valves with oversized stems if dial indicator reading is excessive or if the stems are scuffed or scored.
5. Service valves with oversize stems and over size seals are available in 0.15 mm (.005 inch), 0.40 mm, (.015 inch) and 0.80 mm (.030 inch)
oversize. Oversize seals must be used with oversize valves. Reamers to accommodate the oversize valve stem refer to specifications.
6. Slowly turn reamer by hand and clean guide thoroughly before installing new valve. Do not attempt to ream the valve guides from standard
directly to 0.80 mm (.030 inch). Use step procedure of 0.15 mm (.005 inch), 0.40 mm (.015 inch) and 0.80 mm (.030 inch) so the valve guides
may be reamed true in relation to the valve seat. After reaming guides, the seat runout should be measured and resurfaced if necessary. See
refacing Valves and Valve Seats.
