Question about 1993 Mazda 626

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Does a mazda626 1993 have hydrolic lifters or shims?

Problem is have a loud tapping noise coming from the cam area.

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  • suzieq829 Apr 24, 2009

    What would be your suggested solution to this problem? I presume you meant yes the mazda 626 1993 does have hydolic lifters. loud tapping hoise coming from the car area.

  • suzieq829 Apr 24, 2009

    v4. Car is okay. Has to be fixed before selling.

  • suzieq829 Apr 24, 2009

    v4. Car is okay. Has to be fixed before selling.

  • suzieq829 Apr 24, 2009

    I mean 4 cylinder sorry.

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Had same problem, i believe in my v6. the oil filled timing belt tensioner has lost oil and now the pully is hitting the tensioner. just fill the tensioner with more oil, in order to do so you have to pull the tensioner out, may have to re time the engine. but there is an allen key screw in the bottem of the tensioner so oil can be loaded.

Posted on Jul 15, 2009

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Yes , go bad all the time.

Posted on Apr 24, 2009

  • VWdan
    VWdan Apr 24, 2009

    replace them all if the car is nice. V6 or 4cyl?

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2 Answers

Does this car take a valve lash adjustment and what are the settings


Your car has hydraulic lifters. Hydraulic lifters just means that it uses engine oil to control the valve clearances using a bucket and shim arrangement.
Here's a generic image of what a hydraulic lifter can look like:25949035-hsh3lir2aljnaf1jzrgt1uh1-5-0.jpg

If the car makes a tapping sound at start up, this points to a problem in the camshaft area - including the hydraulic lifers/shims. Valve clearances are controlled by the lifters and shims. It could also be a worn camshaft - the lobes can become rounded.

Usually, there is no adjustment possible with most hydraulic lifters. Replacement (usually) means you have to remove the camshaft, though I am by no means certain about your particular model.

If you have the tools and ability, remove the rocker cover and have a look at things.

25949035-hsh3lir2aljnaf1jzrgt1uh1-5-1.jpg The image above shows a camshaft - the lobe is worn and rounded. When this happens valve clearance is excessive and may lead to a tapping noise. Engine efficiency is also affected.

The image below shows hydraulic lifters (example only..).
The lifter on the left has a 'dished' surface - wear caused by the camshaft or the lifter not being able to 'turn' in its bore.
25949035-hsh3lir2aljnaf1jzrgt1uh1-5-3.jpg The usual cause of this is (a) short trips where the engine hasn't had a chance to warm up properly and pump oil to the camshaft area (b) poor oil/infrequent oil changes (c) stuck lifter.

Before you spend money on parts or repairs, first try adding some oil flush to the engine to clear out carbon and 'sticky' deposits.


25949035-hsh3lir2aljnaf1jzrgt1uh1-5-10.jpg
... follow the instructions on the bottle...
Then change your engine oil and add something like a 'valve train additive' - this will try and quieten the tapping noise.
The (Ebay) link below will give you an idea of what additives are available (and so will your local car accessory shop).

Try the cheapest and easiest first. If that doesn't work .. unless you are confident that you can inspect, diagnose and replace parts .. give a mobile mechanic a call. Those guys are usually quite good.

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I have a 2002 jeep grand Cherokee Laredo 8 cylinder engine and it just started making a tapping noise when it's running. The oil hasn't been changed in awhile. Could this make a difference or any other...


yes it most certainly can, thick oil can block hydrolic lifters and make tappets become loose and even fail. that is a good start point because the next is a worn cam shaft

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if its upper noise eg folowers and lifters if they are hydrolic lifters where these replaced are the cams ok if they are manually ajustable tappets these can be ajusted unless the following are goosed again the cams are pitted or mishapen will need new cam shaft the lifter rods are worn or week valve springs
but if they are hydrolic will have to be replaced inc cam shaft hope this makes sence ivan

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is it a knock or tap if its a tapping noise then goes away straight away its a week hydrolic cam lifter if its a heavy engin knock either lack of oil or big end bearing expensive if its this

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if your lifters are sticking, you can try using MARVEL MYSTERY OIL. depending on the mileage and whether it's dual over head cam or over head valve ,their is a chance that a cam lobe could be worn or a rocker could be worn or slipped off. a lifter will collapes and some can even replaced without removing the head.

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ur car uses hydrolic lifters instead of tappets but they sound the same when faulty. most likely a 'sticky' lifter. very expensive to change.

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1997 nissan pickup 4wd, just had timing chain replaced , now have noticeable knocking noise coming from valve cover ? mechanic says need new stack shims on valve rockers ?


Not likely. You have a 4 cyl engine with over head cam. It has hydrolic lifters. If it wasn't making the noise before he replaced the chain, then its something he did...or didn't do. If it was making the noise before, most common reason would be 1 or more lifters not pumping up. If you have a six cyl, no one changed the timing chain, (It doesn't have one!) The 3.0 6cyl has a belt.

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solid lifters? i could be wrong but i think they are hydraulic lifters. ive had quite a few of them not pump up when re-installing the valvetrain and cause a tick. pull off the valvetrain and check to see if all the lifters/tappets are firm with no squish. that might be your problem

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First thing to do is change oil and filter. Hopefully it has not done this long and has hard faced the shims. Good luck and have a good day.

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Remove the valve cover and rotate the engine and check to see if all the valves are opening the same amount. If not, you have either a bad lifter, bent pushrod, or cam going flat. Check your valve lash with the valves closed. You should be at 0 lash at all of the rocker arms.

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