Torque sitting double over head cam cylender head optra 1,6 2005 model chevrolet

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https://eautorepair.net/Marketing/Default.asp

renew bolts
stage1- 30NM
stage2-90deg
stage3-individually slacken off 360deg
stage4-30NM
stage5-90deg

crank pulley bolt-142NM
cam sprocket bolt-88NM

i like to help people like you that give engine codes it makes it so much easier

Hi Lester, Is your vehicle similar to the Aveo 1.6L DOHC?

I’m happy to assist further over the phone at https://www.6ya.com/expert/randall_d932ef6e01588b0f

follow this link for the bolt torques and i would get a good workshop manual for the rest of your work as will be complicated and must be done in precisely the correct order
http://www.speedwayautoparts.com/index35.htm

Your timing marks should be on the belt. There are two single lines and one double line across the surface of the belt. Each of the single lines line up with the cam shaft and the balance shaft drive gears. The double line lines up with the crank gear. If I remember right, there is a small mark on the oil pump housing that the crank mark lines up with and the cam mark is straight up and there are 2 other marks on the cam gear that line up with the head.

try this link click on torque tables and look up your vehicle
http://www.speedwayautoparts.com/index35.htm

On any vehicle regardless of make you always tighten the head bolt in teh same order ,start in the middle lower middle top then one to left and one to right till you reach the end of the head ,do it in two staged first with a rachet which will bring it down to about 40lbs then after doing all of them use nice long snap on bar makesit easier and pull down to about 65LBS for a alluminium head and 75LBS for a cast iron head ,Or in my case till i feel the bolts stretch but as your not a professional use a torque wrench .

For a 4 cylender you Tighten the bolts to 29 ft. lbs. (39 Nm).
In this order.



For a 6 cylender 25 ft. lbs. (34 Nm).



Good Luck and please rate 4 thumbs up for the free answer

VALVE CLEARENCE FOR INTAKE VALES .0010 - .0020IN AND FOR EXHAUST 10020 -.0030IN.

most are 65 foot pounds ,that is what i say it is . gm on v8 engines are same ,head bolts are 65 and hope this it some help,thanks robert b.