I have a corolla 09 with a rattle noise on cold start i already changed intake gear the chain tensioner i heard with a pipe the starter and the noise doesnt come from there. The noise last few around 1-2 seconds. I thoguht there was a problem on the distribution like a loosen chain or the guides but a mechanic tall me that problem is with the lifters or the valves cause the oil passages are clocked or the valve and the guides are worn. He sugested me make a oil flush and then add an oil staibilizer to see if the noise is better. By my part i have been checking and analyzing the posibles casues for this but i saw this i had a big question. Is this bolt close to the chain tensioner a kind of chek valve or oil jet to avoid the oild drain to the summ. I took it out and there is nothing just what you will se the in the pictures. If is the case that there should go a oil jet or something similiar where can i find it. THANKS FOR YOUR TIME
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