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General Car Chat / Re: Zafira B 1.6 top end noise.
« on: 06 March 2024, 10:51:56 »You may have inadvertently "pre-loaded" the cam phasers when you did the belt change
putting a strain on them, resulting in their failure .
did you use ALL the kit
the kit contains a flat bar (to lock cams ,rocker cover off)
2 "wedges" to hold/lock the cam sprockets
a crank locking bracket
that said, parts fail on their own without any "help"
new-fangled VVT sprockets failing IS common
don't beat yourself up about it , unless you're in to that sort of thing
No worries, I've been hanging onto the end of a spanner long enough to know we all make mistakes. Pre-loading is a possibility, I didn't use the flat bar to lock the cams at the gearbox end as a) I didn't want to disturb the rocker cover gasket and (fairly rusty) bolts and b) the couple of online guides and the Haynes manual all pointed to it not being necessary unless you're going to remove the cam sprockets. I did use the little right angle bar thing with a hole in it to lock the flywheel using a gearbox mounting bolt and the 2 wedges to lock the cam sprockets. I would have thought that would have been sufficient. I also followed the installation 'order' for the belt as per Haynes.
Finally, the timing was also visually checked twice, each after 2 full rotations of the crank and was bang on (to my eye).
I'll get it stripped down on my breaks over the next few days and hopefully that will tell me more.