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d series honda's used solid tensioners for years and years and they never had issues. i think the recommended replacement interval is around 160 000 km's or 100 000 miles in normal conditions.
D series Honda engines use a spring which constantly applies pressure to the belt.
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The K's use a chain, and chains stretch at a constant, even rate with use. A belt should only stretch once, and only a little. Like I said, how many Hondas have you ever known to need the tensioner reset, ever?
But Honda still equips those engines with an automatic self-adjusting tensioner. I will admit I do not know how much or for how long a timing belt will stretch.
My OPINION is that no street or daily driven car should use a solid, non-self-adjusting tensioner.
Beat me to it. Its a spring, just like a 1.5L Mitsu. Love how simple it is.