The two springs are Lucas part number 62410915 in the 29D4 with vacuum advance as used in the Matic.

The weights are part #62410413, the same as for the non-vacuum advance 29D4 as used in the Cooper S and Clubman GT. The springs for the latter are part #62411108.



As the Doc said, springs can be had here - https://www.distributordoctor.com/distr ... rings.html

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ex-NSW Police 1970 MK II Cooper S
VMCI #43

I just tried to get some springs from distributer doctor in the Uk, he wanted to know the model, which I gave him. He replied 'that's Australian so I don't have the springs'. I wanted the spring set Doug mentioned above part #62411108.

The part numbers shown by Doug above for Mini-Matic are the same as those for manual transmission for 25D4 upon a change from 25D4 to 29D4 in mid 1967. However, the drawings, dated Feb 1967, show different advance, both mechanical and vacuum, for the Mini-Matic engine 9AN as indicated by my previous post in this thread. The Mini-Matic was shown in prototype form in 9/67 and released towards the end of the year or early 1968. I don’t know the date of the table shown by Doug, but it appears inconsistent with the drawings (also supplied by Lucas). Given the completely different gearing for the Mini-Matic compared with the manual, I doubt if the advance characteristics from the manual would be used in the automatic and would therefore stay with the advance curves shown earlier for the Mini-Matic. Unfortunately, the drawing only gives the distributor part number as an assembly and not individual components.

Feb 1968

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ex-NSW Police 1970 MK II Cooper S
VMCI #43

This chart shows that the part number in brackets is the “changed” part number for auto transmission (since 62041034A is the manual transmission distributor and 62941069A is thus changed part for Mini-Matic).

However, in checking the part numbers for individual components, every part listed is the same as the manual model.

I’d say they have forgotten to include the individual part numbers for the auto distributor which should have been listed alongside those shown with brackets to indicate the changed parts.

I am very confused.

I want to replace my 29D4 springs for my Mk2 Cooper S.

Please tell me the part number. Are they the same as 25D4 ones?

I mentioned the part number for the 29D4 S springs in an earlier post - #62411108.

Here's the page from the Clubman parts book showing the same 29D4 used in the Clubman GT.

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ex-NSW Police 1970 MK II Cooper S
VMCI #43

The 25D was available in hundreds of different applications, and used lots of different springs to suit each application

The Mk2 Cooper S was noted in the road tests to suffer pinging even with 100 octane fuel in one car, so the advance curve wasn’t even appropriate back then to all engines.

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So is the Clubman 1275 refering to the 1275LS or the GT?

The Clubman GT.

This parts book was the first one released for the Clubman style body in 1971 so doesn't include later Leyland models.

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ex-NSW Police 1970 MK II Cooper S
VMCI #43

I know the springs have been messed with since the piston incident but I just tested the 29D and here's the results compared to the specifications.




I then modified it with the springs that I had available. The dimensions match that of the donor 43Ds so the springs seem to interchange fine but probably need different specs to if they were in a different model distributor.



Yes it's out of the specifications but it's probably a lot better than what it was. most would say the original curve is useless anyway.

Now if it's compared to the specifications for a 1980s 10.3:1 998 auto then it's within specifications. This spec is possibly a better choice than the 60s curve.



If anyone knows where I could find mixed Lucas springs it would be great.

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1986 Mayfair (998 auto), 1974 S, 1974 Van, 1972 PMG Van

Too many minis

mgsales.com.au has a set of 5 lucas springs I used the lightest one as the 2nd spring.


154-285 551-010 TT1903 DISTRIBUTOR ADVANCE SPRINGS 5PC LUCAS

Also try distributor doctor in the UK they have a zillion springs but good luck deciphering what you want.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

I have actually ordered the ones from mgsales. I'm guessing I'll have to keep buying the set just for one spring each time I do a distributor.

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1986 Mayfair (998 auto), 1974 S, 1974 Van, 1972 PMG Van

Too many minis

Please forgive my ignorance but don't you need 2 springs and don't they both need to be different.

In my case it was a Chinese made 43D distributor. The heavy spring was too heavy, advance curve too long and too much.
I reduced the advance to 9-10 dizzy degrees and adding the softest spring from the 5, which is heavier than its primary spring, gave me full advance at 4000 engine RPM. As I wanted with a 282 cam in it.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.