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Duplex Timming Chain


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#1 Thelimes79mini

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Posted 16 June 2012 - 03:26 AM

Im going to put a swift tune cam in with a duplex timming setup
what do i have to do to the timming chain cover if anything at all

Thanks The Lime in Canada

#2 dklawson

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Posted 16 June 2012 - 10:45 AM

Others will have to confirm if I am correct, but I thought the A+ engine was introduced in 1980. Assuming from your login name that your car is a 1979, it would have the original A-series engine.

With the regular A-series I don't think anything special is required to fit the duplex chain and gears. The duplex chain was used on the Cooper-S engines without any special steps.

#3 bmcecosse

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Posted 16 June 2012 - 10:56 AM

The two little screws securing the front plate to the main cap need to be removed - the holes countersunk and countersunk screws fitted. Other wise it's a straight fit for the duplex TIMING chain. If the cover has a vent can fitted - you may need to 'ease' that forward to clear the cam sprocket.

Edited by bmcecosse, 16 June 2012 - 10:58 AM.


#4 tiger99

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Posted 16 June 2012 - 10:57 AM

The main modification is that the two bottom bolts holding the engine front plate to the main bearing cap have to be replaced by countersink screws, which obviously means countersinking the plate. The screws will be 1/4" UNF, same part as the brake drum retainer screws. Use a weak grade of Loctite on them, so they will not work loose (the original bolts had spring washers) but will come out when required.

You need to remove the chain tensioner.

Several different timing covers were used, with or without the oil separator, depending on which breather system the engine uses. You may have to change the cover itself, but probably not.

#5 mike.

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Posted 16 June 2012 - 11:05 AM

I wouldn't remove the chain tensioner, keep it on

#6 bmcecosse

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Posted 16 June 2012 - 11:07 AM

Yep - good idea - I did that - it lasted all of 100 miles before it disintegrated..........

#7 charie t

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Posted 16 June 2012 - 01:01 PM

You had a faulty one then bmc
The tensioner is not to put tension in to the chain but to take up slack. A new tesioner is just a flat plastic pad. Fitting it is optional but its no different to fitting to a standard simplex chain.

#8 ukcooper

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Posted 16 June 2012 - 01:13 PM

To fit a 1275 cover with breather you need to cut out the oil retaining shield ( top arrow )

and bash the indent flat so the chain dose not wear a hole thro the cover ( second arrow )

Posted Image

Edited by ukcooper, 16 June 2012 - 01:14 PM.


#9 Thelimes79mini

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Posted 16 June 2012 - 04:50 PM

Others will have to confirm if I am correct, but I thought the A+ engine was introduced in 1980. Assuming from your login name that your car is a 1979, it would have the original A-series engine.

With the regular A-series I don't think anything special is required to fit the duplex chain and gears. The duplex chain was used on the Cooper-S engines without any special steps.

it is a1979 body the engine is out of 84/85 1300 metro so im told
thanks the lime in canada




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