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Steering Worm

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Steering Worm
Alan Offline
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Joined: Aug 2017 Posts: 1,337 Threads: 34
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Location: Cheshire
Car type: Race Ulster, 1926 Special, 1927 Chummy, 1930 Box
#1
31-10-2017, 03:09 PM
A job I've never done, but is it possible to remove the worm gear from a steering column and replace it with another one?
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Ken Morton Offline
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Joined: Aug 2017 Posts: 46 Threads: 8
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#2
31-10-2017, 03:31 PM
I suspect that the worm blank was fitted to the shaft and then machined. I removed a worm once and tried to fit to a shaft-- dismal failure-- impossible to re align.
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Ruairidh Dunford Offline
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Location: Scotchland
#3
31-10-2017, 04:20 PM
I agree with Ken.
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Alan Offline
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Joined: Aug 2017 Posts: 1,337 Threads: 34
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Location: Cheshire
Car type: Race Ulster, 1926 Special, 1927 Chummy, 1930 Box
#4
31-10-2017, 04:34 PM
I had a feeling that might be the case. Just thought I'd check.
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Jeff Taylor Offline
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Joined: Aug 2017 Posts: 682 Threads: 17
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Location: The far North East of England
Car type: 1934 Austin 7 AVH Van (in bits & incomplete!), 1936 Morris 8 Series I Tourer
#5
31-10-2017, 07:26 PM
Having never looked that closely at my 1934 A7 steering box, I'm not sure if the Seven worm is attached to the shaft in the same way as those on the Bishop Cam boxes fitted to MG J, K, P, N, TA, TC, Morris 8's and others - new worms are available for MG's in 3 ratios. The second page of this article describes how to remove the worm from the shaft in Bishop Cam boxes, though I've never done it.


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Robert Foreman Offline
Precision Engineer
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Joined: Aug 2017 Posts: 557 Threads: 89
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Location: Deepest darkest Kent
#6
31-10-2017, 08:48 PM
What year of steering box are you working on Alan, the earlier spiked type or the hourglass?
Regards,
Robert.
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Alan Offline
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Joined: Aug 2017 Posts: 1,337 Threads: 34
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Location: Cheshire
Car type: Race Ulster, 1926 Special, 1927 Chummy, 1930 Box
#7
31-10-2017, 09:04 PM
The early type
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Robert Foreman Offline
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Location: Deepest darkest Kent
#8
31-10-2017, 09:17 PM
The earlier spiked type has the worm machined, hardened, ground etc and is then spiked onto the shaft with the thrust washer. Then the spikes are machined flush. I always check the spikes are not cracked when rebuilding a box by tapping with a small chisel and hammer. 
   If they are cracked or missing, the repair that I have done is to chop the shaft higher up and machine a new end with new spikes, silver solder together, replace worm and spike it over as described above. 
   Hope this is of help.
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