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Timing Chain


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#1 malc_west

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Posted 24 October 2020 - 07:13 PM

Hi guys, doing some work to the mini and I've got the timing chain cover off, how do I tell if its ready for replacement and if Im doing so what should I replace it with (the engines a 1275 metro unit in the process of being super charged if this matters.)
Thanks

#2 Cooperman

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Posted 24 October 2020 - 10:28 PM

Is it a single or a Duplex (double) chain?

If it is single, change it for a Duplex set-up. If it is already a Duplex, just fit a new one.

If fitting new chain sprockets, make sure you re-time the cam using offset woodruff keys. 

More info on this if you need it will be forthcoming.



#3 MatthewsDad

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Posted 25 October 2020 - 08:38 AM

The updated timing cover gasket is a quality part (MiniSpares #GUG705550GM). I bought a terrible quality single chain off eBay and returned it - the links were loose and rattling as it came out of the box. Worth sourcing a decent item.

#4 malc_west

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Posted 25 October 2020 - 04:05 PM

Is it a single or a Duplex (double) chain?
If it is single, change it for a Duplex set-up. If it is already a Duplex, just fit a new one.
If fitting new chain sprockets, make sure you re-time the cam using offset woodruff keys.
More info on this if you need it will be forthcoming.

Thanks, so currently it's a single although it looks new (chain in good condition no sign of wear on the teeth) but if you say it's worth upgrading then I will. What advantage does the duplex system have? And looking like I will need some information on resetting the timing as il be replacing the lot. There also doesn't appear to be a tensioner is that odd?




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