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Not all modern engines need you to set the valve clearances. Most engines use oil filled 'tappets' that self adjust the clearance as the oil temperature changes. Depending on which engine it is yours has a lot of the time you can only check the valve clearance but not adjust it.
there does not need to be marks on a harmonic balancer to adjust valves
when a piston is on tdc the valves will be either completely closed or in the valve rock position
when adjusting valve clearence you will need to know the firing order because when no 1 piston is ready to fire , then the next piston to fire will be in the valve rock position
for example if no1 piston of a 6 cylinder ( firing order 153642) is at tdc firing both valves will be closed and so the valves of no5 piston will be rocking so that will be the nect piston valves to adjust and after that no3 piston valves will rock so you do no 5 valves and so on
a workshop manual will explain it all to you
The tappet clearence should be in the owners handbook but it's a bit early a tappet noise from the engine (2006) ! Check oil level and change if it's overdue a service is definately worth a look ! Good luck
The service manual recommends that the valve clearences be checked every 60,000 miles or 72 months. This is "Schedule B" for normal driving as opposed to "Schedule A" for more demanding use of the engine. The clearances are checked by removing the valve cover gasket and checking them with a feeler gage. The valves can be adjusted by using small circular shims. It may be that in practice the valves hardly ever need adjusting.
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