Ok, so I've read over most of the stuff I can find on here about the timing belt kits, including Chrisp from the cavalier forum's (which I am a member) post:
http://www.omegaowners.com/forum/index.php?topic=147662.msg1965804#msg1965804
Just to make sure I am understanding this right:
I've bought kit K015453XS and I understand this is a 2.5 kit (mine's a 2.6 02 plate), but you can swap the tensioner and upper idler from your old backplate to the new one?
Reason I ask is on the old plate, the distance between the idler and tensioner is greater than the new plate, the code on my old plate is 6B, the new one is EB. I also need to use the yellow marking on the belt to line up the crank pulley (there's a white double line and yellow double line near each other on belt), and white markings on the left bank of cams and a mix of white and yellow marks on the right bank of cams.
Cheers
Andrew
Yes, after much to-ing and fro-ing with Gates support, I've concluded that it's best to replace the tensioner pulley and other pulley on the old backplate with the new ones that come with the new backplate, and leave the old backplate in place. This is NOT what Gates advised, which was to replace the old backplate with its old pulley with the new one and its new pulleys, even though the pulley spacings on it are different.
As several people have said it's not strictly necessary to bother with the white & yellow markings on the belt. However, Gates advised that the use of white or yellow markings depends upon the position of the OTHER pulley (the one immediately up from the crankshaft in an anti-clockwise direction). For earlier engines (up to 1999, with the pulley in a lower position) only the white markings should be used throughout, but for later engines (post 1999, with the pulley higher the yellow markings on the belt should be lined up with the marks on crankshaft and those on the LH two camshafts (as you look at the engine from the front), while the white markings should line up with the marks on the RH two camshafts. I have to say it's difficult to understand this when the only difference is the position of the other pulley, which, if you're fitting the cambelt in an clockwise direction has not been contacted before you line up all the markings, but that was Gate's advice.
It probably doesn't matter as long as the crankshaft and cambelt markings are all lined up, and there is no slack in the belt between the two camshaft banks and the crankshaft.
The other uncertainty I face is that my early (1993) V6 engine has a tensioner pulley without an outer flange. This design was subsequently modified by Vauxhall/Opel to include an outer flange as well as the inner one, apparently because the flangeless pulley sometimes allowed the cambelt to ride out slightly and scuff against the plastic cover. You now cannot obtain the flangeless pulley, so I am assuming that it’ll be OK to replace mine with the fully flanged pulley in the kit. Gates were no help with this issue – saying that they had no records of the flangeless pulley.