I recently set the belt tension on a B230F, 88 series engine, non-turbo standard four cylinder engine. After setting them with a belt tension gauge, I checked them a few days later and they were back in the too low area of the gauge, and felt loose. I checked them when they were warm, but set them when they were colder.

I wondered if they loosen up after driving and due to getting warm as things like rubber usually expand when warm. So the question is whether to set them cold or warm?

If I set them warm then will the initial start up tension be too tight?

If I set them cold, will the warming up stretch them too loose?

Is there an in between alternative?

Thank you,

Rob