The cam shaft chain has a spring tensioner which automatically adjusts tension where as the oil pump chain does not. This is adjustable, but it's manual and requires the guide to be pushed against the chain and bolts torqued. The actual guides did have little chain groves in them, but I wouldn't class them as u/s. An adjustment would probably have sufficed, but I had new parts anyway so I wasn't going to do a half job.
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