I hope another expert has answered but I will make a few suggestions. In general you have wear in places where the valve and lifters meet the camshaft lobes. The slight machining of the valve seats in the heads can produce a few millimeters difference in where the valve stem now sits.
With hydraulic lifters there is suppose to be a range of operation which takes up any slack between parts like the valve stems. With non-hydraulic or solid lifters clearance is either adjusted with shims or with screw type adjustments. You may not even have lifters as some engines have camshafts that directly touch the valve stems.
Common practice is to keep worn parts mated to each other. You would keep valve 1 in place to ride on camshaft lobe 1. You would not want to mix say valve 3 into position of cam lobe 1. The two surfaces have different wear patterns.
Also valve spring tension is to be measured on each valve after grinding or valve replacement. Springs are either replaced or shimmed to book specs. Even motor oil can affect sound levels.
Sometimes adjustments can be made after a break-in period. It is hard to place blame without completely stripping the engine and measuring each part. You are kind of at the Mercy of the original repair facility or you may have another place listen to your motor and see if they think it is unusually noisy.
Hope this helps you.
SOURCE: 1995 ford f150 knock for two min when warm up stop
depending how many miles are on motor, sounds like cam bearings have wear,will knock at start up until they fill with oil. hotrod
SOURCE: 2002 Ford Escape 2wd v6
This happened to my wife's Ford Escape and it ended up being the alternator. We had to replace it and it cost around $700-800.
SOURCE: just installed new head valve job done to replace
Did you make sure the timing marks on the timing chain sprockets were aligned with number 1 cylinder at top dead center? If you are getting fuel and spark to the spark plugs, then I would suspect the timing is off.
SOURCE: 2005 Ford Escape 3 liter,
Your main and rod bearings are worn and need to be replaced. Continuing to drive in this condition will only damage your engine further.
SOURCE: 1999 suburban lifer noise
if you have a stethascope or even a wood dowel i would check the lifters. if you have higher miles this sounds like a hydraulic lifter pumping up. if you change to a heavier oil it will go away or reduce. thats the cheap fix.
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