4 years ago#1
lynryd59
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I was at the local 10-minute oil change place over the weekend, and while I had the engine running and the hood opened, the oil change guy asked about a noise in my engine. As far as I can recall, the engine`s always sounded that way (ie. a bit of clicking every 2-3 seconds). When I asked him what he thought, he told me it could be a sticky valve. Anyone know what that could be, how to identify it for sure, and how to fix it?

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4 years ago#2
dotfile
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If is a sticking lifter, add some motor flush or Magic Mystery Marvel to the crankcase, following the instructions. Drive it at highway speeds for an hour or two, but don`t lug it or overload it.
Then drain the oil and replace with new.
See if this helps.
If not, there could be a couple of other possibilities: - Your lifter may just be bad, and can be replaced - You may have low oil pressure due to bad oil pump, or clogged passages, or worn crankshaft bearings. -The valve adjustment nut may have wandered off a bit and needs to be readjusted - The post or pin that the rocker sits on may be only press fitted, and can have backed its way out of the hole.
Could be other possibilities.

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4 years ago#3
AMcCrea
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hook up a vacuum gauge hook up a compression gauge either/both will spot a sticky valve or bad hydraulic lifter don`t start adding a bunch of magic snake oil to the engine until you are sure what the problem is. what type of vehicle/engine do you have?

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4 years ago#4
lynryd59
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It`s a `93 Mazda Protege, 1.8L SOHC.

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4 years ago#5
AMcCrea
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Since yours is an overhead cam motor, there are no `lifters` per se.
Some ohc engines have manually adjustable valves (if there is a valve clearance spec printed on the underhood emissions sticker, this is the case). If yours have not been adjusted for awhile, this could be the issue. When the valves are adjusted, other things under the valve cover, like the valve springs and the condition of the camshaft can be inspected.
Some ohc engines have hydraulic lash adjusters which can get noisy just like hydraulic lifters. Typically noisy HLAs make a very heavy clattering noise when the engine first starts up.

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