Since I have the valve covers off on my
2006 Tacoma V6, I decided to do a valve clearance check. The manufacturer recommended ranges are:
meaning the intake valve clearance should be between 0.006 and 0.010 etc"
Here is the data. The "off" column is populated if the valve is outside the range (other than 0) or if it barely makes the range by being on one of its limits (zero). As you can see, five of the 24 are just barely outside their range (none more than 0.001", a single thousandth of an inch only) and another seven are borderline (at one of the limits of the range).
QUESTION 1: Since my range violations are very small, none more than a single measurable unit, does this test result imply that I should replace the violating valve lifters to get them in the range or do you think I am fine like this since the violations are all very small?
QUESTION 2: How do valve clearances that are outside the range affect the engine function and perfomance?