Hi,
I have just bought a Duplex kit and put it to one side for now whilst I work on other things but a thought occurs, will I require a deeper cover for this set up once installed and what is the best place to source one from?
Many thanks,
Mike.
Duplex timing chain kit
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- Minor Legend
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Duplex timing chain kit
1954 Series 2: 4 door: "Sally" -- Back on the ground with (slave) wheels, now being sprayed by me, slowly......
1970 Triumph Herald 1200: "Hetty" -- Driven back from Llangollen in Wales (twice.....)
1952 Morris Minor MM highlight with sidevalve engine still fitted, wants work, so joins the queue for now......
1970 Triumph Herald 1200: "Hetty" -- Driven back from Llangollen in Wales (twice.....)
1952 Morris Minor MM highlight with sidevalve engine still fitted, wants work, so joins the queue for now......
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- Minor Maniac
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- Location: Hampshire
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Re: Duplex timing chain kit
If you have the original Minor timing chain cover with the felt seal it is better to replace with the later timing chain cover with lip seal.
There is no need to replace the timing chain cove - the depth inside the cover is adequate with sufficient clearance for the duplex set up.
What you will need though is the flat oil thrower disk which is marked 'F' (Front).
https://www.moss-europe.co.uk/oil-throw ... soc=143917
You will also need to replace the two 1/4" UNF hexagon headed screws at the bottom of the front engine plate with two 1/4" UNF countersunk allen screws. The required angle of the countersink for 1/4" UNF screws is 82 degrees but a 90 degree countersink will suffice. Loctite the screws in place.
http://www.minispares.com/product/Class ... o%20search
Make sure that the two sprockets are aligned by using a steel rule across the faces. Adjust the alignment by adding or subtracting shims from behind the crankshaft sprocket.
Also make sure that you have adequate fore and aft float of the camshaft 0.003" to 0.007" after fitting the camshaft sprocket.
There is no need to replace the timing chain cove - the depth inside the cover is adequate with sufficient clearance for the duplex set up.
What you will need though is the flat oil thrower disk which is marked 'F' (Front).
https://www.moss-europe.co.uk/oil-throw ... soc=143917
You will also need to replace the two 1/4" UNF hexagon headed screws at the bottom of the front engine plate with two 1/4" UNF countersunk allen screws. The required angle of the countersink for 1/4" UNF screws is 82 degrees but a 90 degree countersink will suffice. Loctite the screws in place.
http://www.minispares.com/product/Class ... o%20search
Make sure that the two sprockets are aligned by using a steel rule across the faces. Adjust the alignment by adding or subtracting shims from behind the crankshaft sprocket.
Also make sure that you have adequate fore and aft float of the camshaft 0.003" to 0.007" after fitting the camshaft sprocket.
Last edited by philthehill on Sun Apr 19, 2020 11:04 am, edited 1 time in total.
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- Minor Addict
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Re: Duplex timing chain kit
It will fit in the standard cover, but you must countersink the two 1/4" UNF screws behind the crank sprocket that hold the front plate on.
If you want a tensioner, you will need to convert to the later timing cover with a bulge and do a couple of addition small mods.
I have just done this on my spare engine rebuild, with help from the other Phil with a drilling template etc.
Phil
Edit
Looks like he just beat me to it
If you want a tensioner, you will need to convert to the later timing cover with a bulge and do a couple of addition small mods.
I have just done this on my spare engine rebuild, with help from the other Phil with a drilling template etc.
Phil
Edit
Looks like he just beat me to it

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- Minor Legend
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Re: Duplex timing chain kit
Thanks Phil, the two screws were included in the ESM kit.You will also need to replace the two 1/4" UNF hexagon headed screws
The flat thrower, that you attached a link for, is out of stock at Moss, however this was also included in the kit: Is this it, or does it have another purpose?
A seal for the cover is also included, so I shall have a look to see what type of cover is fitted, the engine is a later 948 though I don't know what year it's from.
Best wishes,
Mike.
1954 Series 2: 4 door: "Sally" -- Back on the ground with (slave) wheels, now being sprayed by me, slowly......
1970 Triumph Herald 1200: "Hetty" -- Driven back from Llangollen in Wales (twice.....)
1952 Morris Minor MM highlight with sidevalve engine still fitted, wants work, so joins the queue for now......
1970 Triumph Herald 1200: "Hetty" -- Driven back from Llangollen in Wales (twice.....)
1952 Morris Minor MM highlight with sidevalve engine still fitted, wants work, so joins the queue for now......
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- Minor Legend
- Posts: 3703
- Joined: Fri Apr 11, 2008 7:28 pm
- Location: Mansfield, Nottinghamshire.
- MMOC Member: Yes
Re: Duplex timing chain kit
Ignore that (pictured item in above post), I have found a parts list for the kit and it clearly isn't.What you will need though is the flat oil thrower disk which is marked 'F' (Front).
However I have found this on Charles Ware's site, which looks to be the right thing?
https://www.googleadservices.com/pagead ... BA3&adurl=
If so I will order one, as they still list three in stock.
Best wishes,
Mike.
1954 Series 2: 4 door: "Sally" -- Back on the ground with (slave) wheels, now being sprayed by me, slowly......
1970 Triumph Herald 1200: "Hetty" -- Driven back from Llangollen in Wales (twice.....)
1952 Morris Minor MM highlight with sidevalve engine still fitted, wants work, so joins the queue for now......
1970 Triumph Herald 1200: "Hetty" -- Driven back from Llangollen in Wales (twice.....)
1952 Morris Minor MM highlight with sidevalve engine still fitted, wants work, so joins the queue for now......
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- Minor Maniac
- Posts: 11580
- Joined: Thu Jul 19, 2012 12:05 pm
- Location: Hampshire
- MMOC Member: Yes
Re: Duplex timing chain kit
That is the right oil thrower disk.
The tagged washer in the photos above is the camshaft locking washer.
The tagged washer in the photos above is the camshaft locking washer.
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- Minor Legend
- Posts: 3703
- Joined: Fri Apr 11, 2008 7:28 pm
- Location: Mansfield, Nottinghamshire.
- MMOC Member: Yes
Re: Duplex timing chain kit
Now ordered.
Thanks Phil.
Best wishes,
Mike.
Thanks Phil.
Best wishes,
Mike.
1954 Series 2: 4 door: "Sally" -- Back on the ground with (slave) wheels, now being sprayed by me, slowly......
1970 Triumph Herald 1200: "Hetty" -- Driven back from Llangollen in Wales (twice.....)
1952 Morris Minor MM highlight with sidevalve engine still fitted, wants work, so joins the queue for now......
1970 Triumph Herald 1200: "Hetty" -- Driven back from Llangollen in Wales (twice.....)
1952 Morris Minor MM highlight with sidevalve engine still fitted, wants work, so joins the queue for now......