On the white blocks, it's fairly easy (for a blind man) to mis-time the
exhaust cam by a couple of teeth, despite the pretty clear timing marks that
Volvo put on every single pulley.
They obviously didn't bother to pop out the plugs at the rear of the head
and check the cuts in the cams both are level, which takes about 3 mins.
In essence, find a better mechanic.
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