Question about 1994 Mazda 323

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My engine number is BP223987 what type of lifters does it have {Hydraulic or shimmed} as it has developed a loud tapping in the valves

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  • sparksy59 Aug 01, 2009

    Sorry no lifter gap there. I only need to know if this engine has hydraulic lifters or shimmed lifters

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Look under the hood at the emission labels. if it has a gap for lifters ( valves ) you will know

Posted on Aug 01, 2009

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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.

12results for camshaft additive

Nov 08, 2015 | 2004 Suzuki Forenza

2 Answers

What's your question?THE AUDI 500 SE DOES IT HAVE HYDRAULIC LIFTERS OR SHIMS


Depending on the year model, the very first Audis had shims, but most had hydraulic lifters

Oct 11, 2015 | Audi Cars & Trucks

1 Answer

Does a 1999 frod contour have hydraulic lifters or mechanical lifters


Both the 2.0 liter 4-cylinder, and the 2.5 liter V6 are overhead cam engines. While all years of the V6 us hydraulic tappets, the 4-cylinder engines varied. From 1998 and earlier, they had hydraulic tappets. From 1999 on, they used shimmed mechanical tappets. Adjusting valve clearance on the later engines is a little involved, and, if you're not familiar with the procedure, it is perhaps best left to a professional mechanic who is familiar with the engine.

Aug 07, 2013 | 1999 Ford Contour

1 Answer

I have a loud tapping valve can i use an additiveto fix problem


If you have a hydraulic lifter that is sticking, sometimes marvel oil or lucas engine additive will help. If the noise is caused by wear at the rocker pivot or the lifter/camshaft, it will not. No chemical can replace a worn part.

Aug 02, 2010 | 2001 Jeep Grand Cherokee

1 Answer

98 TAHOE VORTEC 350 JUST REBUILT REPLACED EVERYTHING BUT CAM AND LIFTERS NOW IT HAS A LOUD LIFTER TAP AFTER IT WARMS UP.I WAS TOLD BY THE MACHINE SHOP THAT THESE ROLLER CAMS AND LIFTERS DONT WEAR OUT .I...


As far as I know all hydraulic lifters can go bad, collapes or stick. And yours are definately hydraulic lifters, rollered yes, which will make them more durable, but they can go bad. The machine shop should have down a leak-down test on the lifters. That is the only way to determine if the lifters are good. I would check that you have proper oil pressure, I'm sure you do. I bought a "rebuilt head" for a Saturn DOHC engine, and the machine shop never did a leak down test on the lifters, and I had the samething happening.

Mar 16, 2010 | 1998 Chevrolet Tahoe

1 Answer

Just had timing belt and water pump done now the tapping noise has got worse. real loud on start up then it is a constant tapping. been told it could b valves needing adjusting. do u have any sugestions...


what type eng????most likely the valve push rods and lifters need changed......they are probably hydraulic and have "collapsed" over the years...hydraulic valves cannot be adjusted as such but could be needing tightened-but not likely...this i an expesive job and you may want to consider cutting your losses....good luck and hope this helps

Mar 16, 2010 | Ford Laser Cars & Trucks

1 Answer

My oil psi is reading 140 and I hear the engine tapping. It has enough oil. What can be da problem?


valves require adjustment if they are hydraulic lifters you will have to get shims to take up the slack

Mar 04, 2010 | 2002 Pontiac Bonneville

1 Answer

1993 mazda mx6 2.5 when should a valve adjustment be done little noise is that common 144,000 mles .


the valve lifters should be hydraulic and not adjustable on that engine, either you have a clogged oil feed to them, in which case wynns hydraulic lifter treatment will cure it after a few days, or the shims are worn and replacement means using a micrometer or vernier gauge to measure each shim against the specified clearance and then fitting individual bucket shims to each valve to correct the wear, but try wynn's first, its cheap and works well for sticky lifters.

If the 2.5 has VVT (variable valve timing) it may be this unit thats making the noise, not the valves...

Jan 15, 2010 | 1993 Mazda MX-6

1 Answer

Engine runs good then I hear a tapping noise. could I have a bridge broke inside the engine? 1987 brougham with a 350 Olds motor.


noisy lifter is number one....get an addititive like hyper lube and run it 20 min on the freeway,. lifters are hydraulic and get gummed up with a varnish like substance. an additive dissolves it and restores the hydraulic lifters action,which operates the pushrods that operates the valves

Jul 23, 2009 | 1987 Cadillac Fleetwood

1 Answer

93 festiva engine valve noise


You would have to read the tech manual to see if they are just shims or if the are a hydraulic type lifter. They would actually pump up with oil and hold slight pressure on the cam so there would not be the tappet noise associated with a solid lifter cam. Odds are they got gummed up and started tapping on you. Hopefully you marked the cylinders they came off of and placed them back in the same location on the cylinder head as originally installed. You don't want premature cam failure because of the mismatched wear patterns on the lifters. Good Luck, RAC

Apr 20, 2009 | 1992 Ford Festiva

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