Quote:
Originally Posted by SD1too
.... Sometimes however, it's just the two 'O' ring seals mounted on the expansion tank cap which flatten. They're not available separately from X-Part but something suitable can be obtained cheaply.
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Viton O rings from Jack -
https://www.ebay.co.uk/itm/133016723...m=133016723782
I fitted a brand new LR cap and the rings went flat straight away (these were standard rings, not Jack's Viton rings). Over-tightening the cap can almost certainly flatten the rings but I'd made sure not turn it past the first 'bite point' - and they still got flattened.
The owners manual page 145 says this:
Ensure the cap is tightened fully after top-up is completed. It doesn't say what fully tight is and it doesn't mention over-tightening.
So it's difficult to know how much to tighten the cap on this car. Every other car I've had you just screwed the cap on until it wouldn't turn any further (i.e. it came up against the stops). The 75's cap seems to keep turning for much longer before anything mechanical stops it. Why?