Voyager L4-153 2.5L SOHC (1990)
Valve Guide: Service and Repair
1. Remove carbon and varnish deposits from inside of valve guides with a reliable guide cleaner.
2. Check valve guide wear:
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Insert valve with valve head positioned 10 mm (0.400 inch) above cylinder head gasket surface.
Checking Valve Guide Wear
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Move valve to & from the indicator.
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The total dial indicator reading should not exceed the amount specified in chart above. Readings should be taken for lengthwise and crosswise
(in respect to the cylinder head) movement for each valve. Ream the guides for valves with oversize stems if dial indicator reading is excessive
of if the stems are scuffed or scored.
3. Service valves with oversize stems and oversize seals are available in 0.15 mm (0.005 inch), 0.040 mm (0.015 inch) and 0.80 mm (0.031 inch)
oversize.
NOTE: Oversize seals must be used with oversize valves.
Reamer sizes to accomodate the oversize valve stem are shown in the chart.
4. 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 (0.030 in.). Use step procedure of 0.15 mm (0.005 in.), 0.40 mm (0.015 in.) and 0.80 mm (0.030 in.) 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.
Replace cylinder head if guide does not clean up with 0.80 mm (0.030 in.) oversize reamer, or if guide is loose in cylinder head.