XL-7 4WD V6-2.7L (2003)
Lifter / Lash Adjuster: Testing and Inspection
Hydraulic Valve Lash Adjuster Inspection
Check adjuster for pitting, scratches, or damage. If any malcondition is found, replace.
Measure cylinder head bore and adjuster outside diameter to determine cylinder head-to-adjuster clearance. If clearance exceeds limit, replace adjuster
or cylinder head.
Hydraulic valve lash adjuster O.D.
Standard: 30.959 - 30.975 mm (1.2188 - 1.2194 inch)
Cylinder head bore
Standard: 31.000 - 31.025 mm (1.2205 - 1.2214 inch)
Cylinder head to adjuster clearance
Standard: 0.025 - 0.066 mm (0.0010 - 0.0025 inch)
Limit: 0.15 mm (0.0059 inch)
Valve Lash Adjuster Noise Inspection
In case of the followings, valve lash adjuster noise may be caused by air trapped into valve lash adjusters.
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Vehicle is left for 24 hours or more.
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Engine oil is changed.
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Hydraulic lash adjuster is replaced or reinstalled.
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Engine is overhauled.
If noise from valve lash adjusters is suspected, perform the following checks.
1. Check engine oil for the followings.
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Oil level in oil pan - If oil level is low, add oil up to full level hole on oil level gauge.
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Oil quality - If oil is discolored, or deteriorated, change it.
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Oil leaks - If leak is found, repair it.
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Oil pressure - If defective pressure is found, repair it.
2. Run engine for about half an hour at about 2000 to 3000 rpm, and then air will be purge and tapping sound will cease.
3. Should tapping sound not cease, it is possible that hydraulic valve lash adjuster is defective.
Replace it if defective. If defective adjuster can't be located by hearing among 16 of them. check as follows.
a. Stop engine and remove cylinder head cover.
b. Push adjuster downward by hard (with less than 20 kg or 44 lbs. force) when cam crest is not on adjuster to be check if clearance exists
between cam and adjuster. If it does, adjuster is defective and needs replacement.
