TL L5-2451cc 2.5L SOHC MFI (1997)
Valve Guide: Testing and Inspection
VALVE MOVEMENT
Dial Indicator Method
Measure the guide-to-stem clearance with a dial indicator while rocking the stem in the direction of normal thrust (wobble method).
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Intake Valve Stem-to-Guide Clearance:
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Standard (New): 0.04-0.09 mm (0.002-0.004 inch)
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Service Limit: 0.15 mm (0.006 inch)
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Exhaust Valve Stem-to-Guide Clearance:
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Standard (New): 0.10-0.16 mm (0.004-0.006 inch)
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Service Limit: 0.20 mm (0.008 inch)
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If measurement exceeds the service limit, recheck using a new valve.
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If measurement is now within the service limit, reassemble using a new valve.
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If measurement still exceeds limit, recheck using the Alternative Method, then replace valve and guide, if necessary.
Alternative Method
NOTE: An alternate method of checking guide to stem clearance is to subtract the O.D. of the valve stem, measured with a micrometer, from the
I.D. of the valve guide, measured with an inside micrometer or ball gauge. Take the measurements in three places along the valve stem and three
places inside the valve guide. The difference between the largest guide measurement and the smallest stem measurement should not exceed the
service limit.
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Intake Valve Stem-to-Guide Clearance:
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Standard (New): 0.020-0.045 mm (0.0008-0.0018 inch)
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Service Limit: 0.075 mm (0.0030 inch)
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Exhaust Valve Stem-to-Guide Clearance:
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Standard (New): 0.05-0.08 mm (0.002-0.003 inch)
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Service Limit: 0.10 mm (0.004 inch)
