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Not easy to see as the timing belt cover is in the way, idler is mounted on the oil pump and tension is adjusted by rotating the water pump. Crap design IMO.
ABY has the idler on an adjustable mount, much easier to tension correctly. There is also less movement of the belt when the engines running as its tension point is higher.
ABY style oil pump is considerably more expensive from memory, that’s the only downside i can think of. It might be possible to fit a 3B pump or cut the idler mount off it to save a few quid.
The other difference between the two pumps is the shape of the cast belt guard. You will find that the cambelt splash guards for the rr/3b pump will not fit the later pumps and visa versa.
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