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General Car Chat / Re: Zafira B 1.6 top end noise.
« on: 05 March 2024, 23:24:49 »
Nothing is impossible, and I'm not so arrogant as to think I'm perfect.
But - I'm not sure why it would have run fine for 250miles before the issue developed (belt tension is still good) nor why it would get worse as the engine warms and better when it cools. Both of these things are explained by worn dephasers but arguably not if I'd bent the crank by botching the belt.
All that said, I am going to strip it down in prep for a pulley change and that involves taking the rocker cover off and locking the cams at the gearbox end. So, if I go to do that and it's not perfectly aligned with the crank at TDC, I will know I've screwed the pooch .
But - I'm not sure why it would have run fine for 250miles before the issue developed (belt tension is still good) nor why it would get worse as the engine warms and better when it cools. Both of these things are explained by worn dephasers but arguably not if I'd bent the crank by botching the belt.
All that said, I am going to strip it down in prep for a pulley change and that involves taking the rocker cover off and locking the cams at the gearbox end. So, if I go to do that and it's not perfectly aligned with the crank at TDC, I will know I've screwed the pooch .