4A Front Suspension Rebuild

The 4A, 4AB, 4AC, 4AD cars, including the SM 1500 Roadster and SMX
2001f4s
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4A Front Suspension Rebuild

Postby 2001f4s » Tue Aug 15, 2017 1:50 am

Hi
Any suggestions on rebuild of the front suspension on a 4A. A source for bushings, bearings, etc.

Thanks
Scott

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Paul Bouchard
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Re: 4A Front Suspension Rebuild

Postby Paul Bouchard » Tue Aug 15, 2017 1:09 pm

This can be a satisfying project to and one that may contribute to a direct improvement in the feel of the car when driving.

Bushings are available in the UK, however my source is no longer with us anymore. Bill Haverly was a wealth of information as well as an excellent purveyor of things Singer, especially Roadster. One source that I have heard of, but not tried, is in Australia: Mackay, their number S112. The dimensions are 7/8” outer diameter, 15/32 hole, 1” long overall (including a ¼” flange). 24 are needed overall. Bill Tull, ASCO in the UK, took over their club spares. He can be reached at billtull1954@hotmail.co.uk. He may be able to point you in the right direction. Changing these involves prying out the old ones and then inserting in the new. Some lubricant (rubber safe), a couple of washers, a bolt and nut were what I used to ease them into place. They were also found on Austin, Morris, and Vauxhall’s of the time.

Springs can be adjusted at a local spring shop. Try a truck garage for sources if need be. The free camber for the front springs is 4.375”. At a load of 440 lbs this becomes 1.0675” Rear springs have a free camber 3.625”, at a load of 440 lbs is 1.1875”. If you are removing the rear springs be cautious when removing the bolt at the front of the spring. It is a stepped bolt and has an inherent weak point where the threaded part is. Use a generous amount of penetrating oil, liquid wrench or other type. This, time and gentle persuasion are key.

Shocks are the Armstrong type. they can be rebuilt, however they are usually pretty good and need regular maintenance.

Hope that this helps.

Paul
Paul Bouchard

President, NASOC
Nine Roadster Registrar

1948 A Series Roadster
1947 Super Ten Saloon
1935 Le Mans Super Speed Model

Just enjoying the ride.

2001f4s
Posts: 40
Joined: Sun Mar 24, 2013 3:22 am
First Name: Scott
number: 3

Re: 4A Front Suspension Rebuild

Postby 2001f4s » Sat Aug 19, 2017 12:56 pm

Thanks Paul,

Shocks rebuilt, and I was planning to have the springs re-curved if needed, but I will at least clean and repaint. I am going to delay doing the rear suspension for now, but have already sheared the bolt heads in the front where the front of the spring mounts to the frame.

Thanks again
Scott

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Paul Bouchard
Posts: 404
Joined: Thu Nov 17, 2005 9:35 pm
First Name: Paul
number: 3
Location: Deux-Montagnes, Quebec, Canada
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Re: 4A Front Suspension Rebuild

Postby Paul Bouchard » Sat Aug 19, 2017 4:34 pm

Ouch on the front bolts. From my memory they are not stepped so once everything g is drilled and tapped a replacement should be relatively easy to find. I am sure that there are a couple of North American sources and failing that the UK.

Good luck
Paul Bouchard

President, NASOC
Nine Roadster Registrar

1948 A Series Roadster
1947 Super Ten Saloon
1935 Le Mans Super Speed Model

Just enjoying the ride.

2001f4s
Posts: 40
Joined: Sun Mar 24, 2013 3:22 am
First Name: Scott
number: 3

Re: 4A Front Suspension Rebuild

Postby 2001f4s » Mon Aug 21, 2017 5:39 pm

Front suspension out, and only 3 of 4 mounting bolts sheared. I am on to the spring re-curve now. Paul thank you for the insight and encouragement.
Scott


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