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Re: Hi , I've got a tapped noise on my Sonata 2.0 L...
You may have low oil pressure due to a plugged passage, have you tried flushing the engine with any of the commercial engine flushes out there, shops also do this service. It is also poss that the noise is not the valve train but piston skirt slap.
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Most engines now use hydraulic lifters and they can leak a little, this causes space between then lifter and the push rod. This results in a tapping noise that goes away when they get warm or fill back up.
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
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.
Valve noise will be there all the time, unless the vehicle has hydrolic lifters. if it has then the lifters should be replaced. If it has adjustments you can check the clearance with a feeler gauge, but I believe the sound is more likely to be low oil pressure. this can be caused by the wrong oil filter having been fitted or the oil pump becoming weak. The third reason is wear on the connecting rod or main engine bearings. With mechanical adjustable followers the noise will be steady at all times and not disappear . As you haven't named the vehicle or engine type it's a little difficult to be explicit.
Those model lifters are quite notorious for clogging up with hardened oil as they ran a bit hot... my suggestion would be to service all your lifters or replace them up to you and make sure all clearances are correct at tappets and valves :)
Good Luck :)
The lifters on your vehicle would not be adjustable, so depending on mileage, a lifter could need replacing. Listen to this sound to determine if it is at engine speed, or at camshaft speed, which is half as fast. If at engine speed, it could be any number of things. If at camshaft speed, it couild be a broken vavle spring, a sticky valve or a noisy lifter.
Sounds like lifter noise. The best solution for lifter noise is, change
the oil use a good quality oil , i would recommend a synthetic oil or
at least a couple of quarts. Then get a bottle of MARVEL MYSTERY OIL
this stuff works good add that to you oil when you change it and that
should clear up any lifter noise. Another thing that might help use a higher grade gas a couple of times.
these 3.3l engines are equipped with timing chains. if vehicle has prolonged down time, typically more than 4 hours, vehicle makes a chatter until the timing chain tensioners put tension on the chain. you will need them replaced.
The lifters can be cleaned by getting the engine nice and hot and then adding an engine flush to the oil and leaving the engine running at a high tickover for about 15 to 20 minutes, and then giving the car an oil and filter change.
Are you sure its the tappets and not the timing chain?