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Author Topic: 1938 Aprilia steering angles  (Read 1720 times)
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Parisien
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« on: 18 July, 2019, 08:48:51 AM »

Can anyone help with this query please?

Hello , I act as curator of the home fleet of lambda owner/member Douglas Blain.

He also owns a  unique trials special known as the Crocus built in 1950. It comprises an HRG chassis , Ex HRG Singer 1500cc engine ,Pre select g/box,Triumph Dolomite rear end, and a 1938 Aprilia steering/suspension system. We seek basic toe in /out settings for a standard Aprilia to start as a basis to  sort this renovationís  wayward steering habits. Can any one assist please ? A third Lancia in the fleet , a Thema 832 What a motor car!

Regards Keith Styles

P
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Frank Gallagher
tzf60
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« Reply #1 on: 22 July, 2019, 01:13:27 PM »

Hi Frank,
Search 'Maintaining an Aprilia' on this forum. It gives photocopies of the excellent booklet that was produced by the LMC back in the Eighties, which has some of the suspension settings.
 
Regards,
Tim
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1939 Series 1 Aprilia undergoing very slow restoration.....
 
Previous Lancias: 1979 Beta Sedan 2000, 1982 Delta 1500, 1988 Delta 1.3, 1992 Dedra 1.8ie
davidwheeler
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« Reply #2 on: 25 July, 2019, 06:11:24 PM »

From memory, toe-out is about 3-5mm.
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David Wheeler.  Lambdas, Aprilia, Fulvia Sport.(formerly Appia and Thema as well).
DavidHill
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« Reply #3 on: 01 January, 2022, 05:04:12 PM »

Hi,

I have just replaced all the steering bushes, and am now planning to set the steering up with 0 mm toe in as advised in the Aprilia maintenance note for radials.  But have hit a snag (as always on Aprilias!)   On the attached diagram from the TAV there are three adjustment points...one on each end of the main steering rod marked in the diagram as 7 and 10 , and then a further adjustment cam on the steering rod attached to the drop link from the steering box - marked 11.  Looking at the setup i can see how 7 and 10 adjust the toe in...what does 11 do?  Is there a sequence to be followed in setting the steering angles?  I have also realized that the adjustment pins for 7 are broken and will have to be drilled out...which means taking off the bracket marked 8 from the sling pillar - which means taking off the brake drum, brake shoes and backing plate...or can i ignore one end and adjust angles all on the 10 and 11?

many thanks for the help,

David

 


* steering aprilia.jpg (446.65 KB, 960x1280 - viewed 12 times.)
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Mikenoangelo
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« Reply #4 on: 01 January, 2022, 07:48:17 PM »

I'm not an expert on Aprilias but looking at the diagram my guess is that adjusting at point 11 which connects the drag link to the arm on the steering box is to enable the steering wheel to be set straight ahead when  the wheels are  straight ahead.

I think you should first set the toe in on the track rod, if there is enough adjustment available at one side you can just use that and ignore the other end unless you find that the track rod is then noticeably out of parallel with the axle beam, in which case you'll probably have to sort out the broken pins so you can adjust both ends. Finally when you can drive the car, adjust the drag link at point 11 if the steering wheel is not central when running straight.

Just my thoughts! If I'm wrong perhaps some Aprilia chap can correct me.

Mike  Clark
« Last Edit: 01 January, 2022, 08:08:12 PM by Mikenoangelo » Logged
DavidHill
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« Reply #5 on: 02 January, 2022, 11:03:46 AM »

Morning Mike,

That makes sense, thank you.  I managed to free up the broken adjustment pins at the problem end and remove them this morning - a major success...so no need to take the hub off to get at the bracket now -  Smiley  so have just painted parts that were rusty and now need to wait for them to dry before reassembling and setting the toe angles...will be interesting to see if the new silent blocks solve the low speed steering wobble i had that caused me to replace them all...

Many thanks
David.
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davidwheeler
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« Reply #6 on: 02 January, 2022, 09:19:05 PM »

You will notice an enormous improvement in the steering if you replace those miserable rubber bushes with proper ball joints, as detailed in my thread on Track rod ends.    Not original I know but I always am prepared to do little modern modifications to improve safety and handling.
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David Wheeler.  Lambdas, Aprilia, Fulvia Sport.(formerly Appia and Thema as well).
DavidHill
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« Reply #7 on: 08 January, 2022, 03:01:16 PM »

Hi David,

interesting suggestion, and am tempted...but have hit much bigger issues.  I fitted all new rubber bushes and put the steering back together.  I had also noticed that the steering arms were bent, so i straightened them before reassembling everything...on moving the steering through its full range whilst stationary to check the steering stops,  the steering rods bent again...on closer inspection i realised that the main rod that connects the two wheels was very corroded at each end and was bending as a result...basically the rod had had it and was likely to shear at any moment!  I now need to source some new steel tube, cut off the bush housings at each end and weld them onto the new tube.  Typical of life getting the Aprilia back on the road!...one small step forward with a test drive and now two large steps backwards!

cheers
David.
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davidwheeler
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« Reply #8 on: 13 January, 2022, 11:19:00 PM »

An even better reason to fit proper ball joint ends rather than trying to weld back those bush housings.    Whilst you are making new rods why not do it properly?
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David Wheeler.  Lambdas, Aprilia, Fulvia Sport.(formerly Appia and Thema as well).
DavidHill
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« Reply #9 on: 16 January, 2022, 03:48:06 PM »

Hi David,

it is tempting to fit rose joints, but i don't think i am confident enough to do that to the Aprilia yet...when i have had it on the road for a while  i may then consider going down that route.....
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davidwheeler
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« Reply #10 on: 16 January, 2022, 11:14:51 PM »

https://www.lancia.myzen.co.uk/forum/index.php?topic=10912.0   tells you how to do it.
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David Wheeler.  Lambdas, Aprilia, Fulvia Sport.(formerly Appia and Thema as well).
Jay
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« Reply #11 on: 24 January, 2022, 01:51:10 PM »

Having ended up with the last of Ben Courageís used Aprilia parts I noticed a few of the steering rods/ties are slightly bent, including the one on my project car, one even had wooden blocks jubilee clipped to it. I can only assume this is a way to shorten the tie to give more toe-in than the concentric pins allow, a novel way of recalibrating the set-up.         
I am definitely going the ball/rod-end joint way. 


* PXL_20220123_160941365.jpg (1970 KB, 4032x3024 - viewed 7 times.)
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Julian Wood, Kingston, London
davidwheeler
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« Reply #12 on: 25 January, 2022, 10:07:14 AM »

I suspect that one came from the treed car!    The original rods are a bit feeble and bend quite easily so it may just be damage from parking on a tree stump!
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David Wheeler.  Lambdas, Aprilia, Fulvia Sport.(formerly Appia and Thema as well).
DavidHill
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« Reply #13 on: 25 January, 2022, 10:23:05 AM »

Completed the new steering rod yesterday (with help from a friend on the welding!)...i put a thread on one end so that the length was adjustable and used thicker section tubing to hopefully avoid any further issues. Now need to paint it and then fit!


* steering rod.jpg (365.71 KB, 960x1280 - viewed 4 times.)
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