Having worked for several different car manufacturers over the years I was always taught to mark everything up with tip-ex. Most belts i've seen come with timing marks on them but if you paint your own marks on the belt sprockets at least you'll know they're right.
Having not worked on the V6 Omega's would I be right in assuming they're a 24 valve motor with twin cam heads??
What I used to do with the twin cam Toyotas and Lexus was to line all the factory marks on the top and bottom pulleys to TDC.
Then apply a paintmark to 1 tooth of the bottom belt sprocket and an opposing mark on the block,then with the cams I used to paintmark the factory marks on the sprockets and opposing mark on the head but as an added safety we also used paint an extra mark on each sprocket facing each other.
So on the left cam you'd have a mark at 12 o'clock and one at 3 o'clock and on the right cam you have one at 12 o'clock and one at 9 o'clock. This was to allow for the cams springing round when the belt was taken off.
The good thing about the 2 marks on the cams is that if one does move you'll see as neither of the marks will line up.
Hope this helps (but probably completely different on these Vauxhall things!!)
Cheers
Roj
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Topic: Please Help! No markings on new cambelt. (Read 2247 times)