Question about 2005 Hyundai Atos

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Incorrect valve clearances

No power, noisy tappets and raw petrol in exhaust gases

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Raw petrol means no combustion in the cylinders or fuel is flooded. Check the spark plugs and ignition spark first. Noise in the cylinder head could mean engine knocking due to oversupply of fuel or unburnt fuel causing higher pressure in cylinder.

Posted on Jun 13, 2014


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Posted on Jan 02, 2017

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SOURCE: valve clearances

Please use this link:,1074701/initialAction,repairGuide/shopping/repairGuide.htm?pageId=0900c15280045c2a

Good luck....

Posted on Aug 22, 2008

Mr BrokRench
  • 1623 Answers

SOURCE: noisy startup when cold, sounds like valve

Hello onarock844...The Hyundai 2.4 litre and the 3.3 litre are known to have valve train noise. Some sooner than others.
The timing chain tensioners on the 06 and 07 Sonata 3.3 engines built before August 4, 2006 are well known for developing wear that allows them to make a tapping or rattling noise for a short time after a cold start. This noise can be mistaken for a lifter noise, although the actual source is in the front cover area of the engine. Hyundai has released a technical service bulletin on this problem, which describes installation of an updated design timing chain tensioner (part #24410-3C300) to correct this noise issue.
Ask your dealer to refer to Hyundai service bulletin #06-20-002 for information...If this has already been corrected,,,and the noise is coming from the upper engine area and not from the timing chain area, then the valve clearance will need to be adjusted. This is done by disassembling the valve train and installing slightly different size tappets to change clearance.
This is a fairly labor intensive process, so if you are still under factory warranty then you will want to go over the dealer's head and get the Hyundai zone rep involved to get it covered before your warranty coverage expires...
I recommend useing a full synthetic engine oil, i know in a few cases where the noise has stopped when the oil was changed over to synthenic, also a high quality filter is important, such as a purolator.
Good luck...i hope this helps...please rate me a fixya.

Posted on Jul 29, 2009

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SOURCE: noisy tappets.. ticking noise around the


Posted on Nov 19, 2010

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Blueish smoke out of exhust,no power, puddle of oil under car, smells like raw fuel out of exhust

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best if you get a workshop manual and check for specifics.

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What is the cause of noisy engine

What kind of noise? Inside an engine there are pretty heavy explosions taking place and they tend to be very noisy, which is why an exhaust system is fitted. The task of this system is to cool down the exploded gases and allow them to lessen their pressure before bringing them in contact with the cooler air outside. If any part of the exhaust system malfunctions, the engine will be noisy.

This system consists of the exhaust manifold, which is bolted directly to the cylinder head and sealed with a manifold gasket, The first exhaust section is usually bolted to this with a flange, which has a gasket or ball and socket seal.

Check the gaskets and check for cracks. After the first exhaust section you will usually find either the second section or the muffler, which allows the gas to expand. Check for cracks or breaks in this unit. From there a further pipe goes to the rear of the car, or in some cases to a resonator box which looks like a second muffler. This has to do with tuning the frequency of the exhaust gases to allow a free flow of exhaust gas at cruising speed to enhance fuel consumption. Check here also for cracks, breaks.

Another kind of noise from the engine could be knocking, which could mean serious engine trouble. If this is the noise you hear, take it to a repair shop immediately.

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1 Answer

Can the tappets be adjusted on a Hyundia Tucson 4 x 4 V6 ,2.7 petrol engine?

Not normally, if they are noisy you can try a heavier oil in the engine.

A 10-40 vrs a 10-30 and change the oil at 5000k religiously.

or you add an oil additive to knock down the noise.

eventually you will have to replace the tappets.
you may want to pull the valve covers and verify all valve rockers are torqued correctly -- looseness hear can create noise.

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Toyota echo tappets are noisey

I DON'T KNOW HOW MANY MILES ARE ON THE ENGINE. Found no bulletins for noise concern
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1987 peugeot 2 liter valve setting engine

these engines with manual rockers had wider than usual settings as i remember ,but set to around 12 th inlet and 15th exhaust and you be far out and check for wear under the actual tappet and if excessive then renew as parts still available but the settings i give should stop the noisy exhaust tappets these cars are famous for

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