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Trevor,
Well, that would be a reasonable assumption, however
a) Immediately after belt replacement some noise was there. It went away after engine flush & oil change and couple days of driving.
b) It would be too much noise for a single belt tensioner. It was very very loud (not your typical lifter noise) and the source of the sound was close to the center of the engine (I tried locating it with a stethoscope, but without much luck). Sounded like if you took an aluminium spoon and hit engine with it, but did it very hard. Piston slap in all 6 cylinders?
The sound would gradually go away as engine warmed up so the stuck piston rings due to bad oil would be a more realistic explanation.
Oh well the bad oil does not explain why the belt jumped and how it could have jumped without damaging itself. Seized camshaft could have caused it to jump, but it should have done some damage somewhere...
For your dilemma I would go with original tensioner if it is not rusty - 100km is not enough mileage :-). Besides it's only 3-4 hours to put the belt back in place if it ever jumps :-).
Water pump is a must though.
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