Q: I have a 2006 V-6 4Runner that now has more than 105,000 miles. Should I have the valves adjusted? Everyone I talk to says not to bother, and that it costs too much.
A: Toyota recommends a valve adjustment at 60,000 miles, but I would probably wait until the 100,000-mile mark for two reasons. One: These engines hold valve clearance well, and when clearance does go out of specifications, it's typically more than it should be. Too much valve clearance can cause a harmless ticking noise, but no clearance at all can burn a valve. Two: It's a pain. The adjustments are done with shims as opposed to simple adjustment screws. This requires recording the original clearance at all the valves, removing the camshafts, then calculating and installing the correct size shims. For me, it's a lot of work. For you, it's money. But, yes, if you're planning on keeping the 4Runner, it's worth the expense. Proper valve clearance does affect performance, fuel economy, and valvetrain longevity.
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