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Suspension Q&As

QUESTION:-

Front Springs

I’m restoring YA0790 in Perth Western Australia.

The front RHS spring is the worse for wear, I will replace both and I have the specification for the standard spring but wondered what alternatives there are – suppliers are few and far between here. Am I correct in saying that the TD/TF and possibly MGA springs will fit and maybe even MGB? I would be happy with a stiffer spring (and ride) and I will ultimately

fit an anti-roll bar – have you any experience/recommendations for what springs to use?

 

ANSWER

When I renewed my front springs in 1995, I could only get MGB ones, which fitted easily! They came from NTG. You can use any of those you mention, they all fit, you will just get a 1/2″ difference in ride-height (ie lower). Often you find the lowest coil has actually broken away but is ‘hidden’ in the spring-pan. Check this pan for cracks around the bolt holes and for thinning due to corrosion where the spring sits.

 

 

 

 

 

 


QUESTION;-

Suspension comparability
Please could you tell me if the y type front suspension, king pins and steering arms are interchangeable with a td/TF.

FURTHER QUESTION;-
Dear Neil, thanks for the quick reply and info. The parts I am really concerned about is the stub axles and the the steering arms that fit through the stub axles that the track rod ends attach to. Are they the same YB to TD?
ANSWER;-
The Y front suspension/steering is identical to the TD/TF except for the spring itself. Some bits from the MGA and MGB will also fit (see part numbers in your spares manual). YB/TD/TF use a different lever-arm damper to the YA (though both fit either car). Best place to get bits is the MG Octagon CC.


QUESTION;-
Front shock absorbers 
I’ve recently inherited from my late grandfather a project he always intended to build, but alas it never happened and I’ve decided to have a go at it myself (I must be crazy!) he car is a special based on a YB chassis and his own body – all he had
was various bits: the chassis frame, a banjo axle, a 1500 engine and gearbox (which I think came from a MG Magnette) – a collection rusty parts really, all with the intention of building something for doing some sprints/hillclimbs – he only had the chassis frame with no log book, so I guess from a cost point of view just using it for sprints/hillclimbs made sense.I’m trying to build up a rolling chassis as the first milestone, however there is no front suspension at all. Because I’m not building an original YB, I want to build the best front suspension of the period – I know the cheapest and easiest thing to do would be to just put on some MGB front suspension, but it’s 60’s stuff and I really want to keep things from the 1950s, meaning I’m looking at YB, TD, TF and MGA front suspension – definitely the shock absorbers and uprights (I will concede
to an MGB anti roll bar and lower wishbones though). I’ve devoured all your online articles about the Y front suspension, the improvements, the similarities with TD, TF and MGA and it’s been hugelyhelpful – thank you for writing them. I’ve got a couple of questions I’d like to ask if you don’t mind at all answering them – I’d massively appreciate it as I don’t know anyone who knows about Y front suspension in as much detail as you do! Firstly, the YB, TD, TF, and MGA all seem to have an ever changing/improving front shock absorber – I am right in saying there are 4 different shapes of shock – is it just the shock body that’s changing or are the arms of the shock different too? If the shock arms are the same length/angles, are the shocks interchangeable with each other i.e. will they all work on all YB/TD/TF/MGA uprights without mucking up
the geometry?

 

ANSWER;-

Yes, there are four different ‘dampers’ fitted to these cars with the Nuffield ifs. The geometry is the same on them all BUT the MGA one has a different set of arms due to the top trunion being different. They all fit the same four bolt-holes. If you use an MGA/MGB one you will need an MGA/MGB king-pin compete.

The YB,TD,TF use a threaded king-pin, the MGA/MGB uses a plain one and a rubber top trunion (** I got the MGA wrong here, see corrections below**). The wheel hubs of the YB,TD,TF are the same as is the stub axle BUT the MGA uses a BMC wheel hub so the stub axle is different. Basically, you either use ALL YB,TD,TF OR all MGA,MGB systems; only the lower wishbone bits are interchangeable.

Neil.

Something else I missed was that the MGA and MGB use standard BMC 4-stud wheels when of the pressed-steel type; the YB,TD and TF use 5 stud wheels. This makes the wheel hubs different. This gives us four types of Y Type suspension; YA (no anti-roll bar and high lower wishbone, different 5 stud wheel centres); YB TD TF with the lower roll-centre lower wishbone and wider 5 stud wheel centres; the MGA on its own with four stud wheels and a kingpin for a disc brake caliper; MGB with plain king pin and four stud wheels. Photo is MGA.

 


 QUESTION

 Anti roll bar

I propose to add an MGB anti roll bar to my TD (currently a bodyoff restoration) and would prefer to reduce the MGB link  rods to Y Type proportions; are you able to suggest the appropriate bolt centre to yolk

eye centre lengths? I have not come across any detailed “how to” articles but plan to locate
the bar fixing blocks with the links roughly vertical when suspension is
loaded normally.

No automatic alt text available.

ANSWER

Most people fit MGB anti-roll bars to Y & T types, not the other way around! The Y Type link is totally different to the MGB and fixes under the spring-pan. It is about 3″ between centres.

Neil.