The timing belt cover is held in place with a 10mm BOLT, bring a socket wrench with you. The spark plug cover uses T30 screws.
You didn't mention the year of the V70. The older versions use hydraulic tensioners and need new timing belts at around 70K and replacement tensioners at 140K. The manual tensioners and belts are good for around 105K, except for 1999 and 2000 where the manual tensioners were found to be defective and needed to be replaced at 90K (the replacement tensioners have all been good).
It will be difficult to determine if the timing belt neeeds replacement by visual means, unless there is impending doom. A light crazing on the inside of the belt is normal, but that is confusing to many who do not know the difference between light and deep. Your best bet is to look for service records or the sticker that indicates when it was replaced.
In your hot climate,I would be just as concerned with vacuum hoses and condition of brake fluid, antifreeze, and tranny fluid color.
Klaus
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The 164 has a new home, all I am left with are a 95 854T and a 98 V70R :)
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