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were the valve tappets adjusted correctly they need to be rotated during adjustments ,also make sure you have correct viscosity oil in engine. it has hydraulic lifters and if oil is cheap, it will aerate and cause rattling
Valve springs
If we are talking about valve lifters, remove cylinder head and pushrods and lifters will be excessable.
fire each valve set the 1 next 2 it
As you give very little information as to make, model, engine size or year, and exactly when it is ticking, this is just an educated guess. Normally this is valve noise caused by valve clearance issues. If it has solid lifters then they need adjusting. If it has hydraulic lifters, they may be clogged and sticking. If it has hydraulic lifters try adding a can of Seafoam engine tune to a fresh oil filter change. It can be purchased at many auto parts stores. Drive the car for 500 miles and change the oil and filter again. You may have to do this more than once to remove the deposits in the lifters. If this does not work, then the valve stems or lifters are worn, and need adjustment or possible replacement.
lifters
Valve adjustment is generally a thing of the past after the introduction of hydraulic lifters (no adjustment). In 1994 your engine should have hydraulic lifters and are not adjustable.
There is no adjustment for hydraulic valve lifters. Lifters can be noisy on some of these models. After ascertaining there is no mechanical damage/broken parts, change engine oil and add 1/2 bottle of STP Oil Treatment (or more if necessary) until lifters are quieter.
There is no valve lash. That engine has hydraulic lifters.
There is no adjustment- the engine has hydraulic valve lifters.
It has hydraulic lifters. No adjustment.
Yes, it will damage all moving parts in the engine.