Cant find a timing mark on crank pully,want to change timing belt on my opel euro 160i 1998

Try this may be this could help
https://big-manuals.com

Timing marks are always on the harmonic balancer,that;s what the pullys blot to that drive your belts.Once you've found said marks by turning the crankshaft pullys by hand,using the belt to do so,scribe said proper timing mark with a white paint pen.Match that mark with the tab on the engine block at the harmonic balancer.Pacience my friend.

Could it be on the ring gear at the back of the engine or on one of the cams if using a timing belt . Could be under a rubber plug on the top of the timing gear covers .

Try the throttle position sensor is set to idle. If set in throttle position this will happen Make sure butterfly set properly first if it has been adjusted same problem will exist

there should be marks on crank pully and cam belt pully. rotate motor until crank pully timing mark is on zero.the cam belt pully should be lined up with its own mark.number one piston should be at the top of its stroke (top dead centre TDC) and number one valves should be shut. if the cam belt mark is not alined with its own mark remove the belt realine the marks and refit the belt

Use the timing marks on the damper for the crank and bring it to 0 on the cam there are marks that correspond with a mark on the head. Look on autozone dot com and put in the year make and model then look at the free repair guides.

the marks for th cams are on the tin stuff behind the gears study it for a bit and nyoull see them the mark for the crank pully is on the case onthe bottom of the crank pully just of to one side

I am assuming you have the 3.3 litter v-6?I just did my own so I can offer you a few words of personal advice. Make sure, before you remove the crank shaft pulley, that the engine is at TDC. There is a pointer on the lower timing cover that should line up with the mark that is furthest to the left on the crank pulley (looking at it from the front of the truck). If you are replacing the timing belt for maintenance, not failure, make several marks on the cam pullies to the rear of the timing cover with a paint pen before removing the old belt and make sure that everything stays aligned to those marks upon reassembly. If this method is not an option, use the timing dimples on the back of the upper timing cover only as reference points for the cam pulleis (this is where I ran in to trouble). What is most important is that there are exactly 40 teeth on the belt between the marks on the cam pullies and 43 teeth between the right cam pully mark (right cam as you look at the engine from the front of the truck) and the mark on the crank pully. I used a Goodyear Belt that actually had marks that indicated the 40 and 43 tooth increments. Make sure you have the belt on the right directon, arrows to the front of the truck. Again it is very important that the crank pully remain at TDC (top dead center) during the entire process. Good luck, hope you get it the first time and not the second like me!!

There is a DOHC or SOHC (double or Single overhead cam engone. Both are Similar. Both have a notch on back side of crank pully that aligns with a tab on engine just above crank pully looks like a triangle with the tip near crank pully is rounded off. SOHC engines have an arrow on cam pully that aligns with a point at top of timing belt rear housing. about straight up at top of it. DOHC have an I and an E on the cam pullys I for INTAKE and E for EXHAUST. the I and E match up at same type points on top of rear Timing belt housing. When installing belt make sure you do not move pullys. put belt on starting with cam shaft (s) then down to crank on tension side which looking at motor will be the right side or Clockwise direction keeping it tight no, or EXTREEMLY little slack. then back up around tensioner. Tensioner should be the last pully to go around. Once on make sure timing marks still lline up.Adjust tensioner and. rotate engine BY HAND 4 times and re check marks.

this is the best guide/instructions I could find on the net and I do allot of this.
take the timing cover off the belt there should be a gear below the camshaft pully its a tensioner use a peice of chalk and mark the very top of the cam pully and the very bottom of the crank pully do your best not to turn them loosen the tensioner pully the belt will loosen up take it off put the new one on if you turned the pully put it back slowly tighten the belt when its tight if the pully turned when tightening pull the slack out by hand then tighten it both chalk marks should be lined up if they are start the car always unplug the battery first and dont rotate the pullys more than a few inches if nessacery when the belt is off you could cause damage to the valves