| ausmini https://www.ausmini.com/forums/ |
|
| Lucas MG35 starter motor https://www.ausmini.com/forums/viewtopic.php?f=2&t=89733 |
Page 1 of 1 |
| Author: | crisonic [ Tue Jun 16, 2015 10:22 pm ] |
| Post subject: | Lucas MG35 starter motor |
I am about to begin the rebuild of an MG35 starter motor - the early one with the barrel commutator. Before I commit to a NOS armature in England can anybody tell me the minimum diameter of the commutator that it can be machined to and still provide a reasonable service life The car is a 1966 English car and therefor must have this date and "Made in England" on the case. This precludes the use of a new replacement |
|
| Author: | drmini in aust [ Wed Jun 17, 2015 8:20 am ] |
| Post subject: | Re: Lucas MG35 starter motor |
Lucas Australia armatures were dimensionally the same as the UK ones. If yours is worn bad, why not source a good Oz armature (everybody has a pile of these starters) and machine the minimum off it. Then fit it to your starter body. To answer your question, I have machined .030" off the commutator diameter in the distant past. |
|
| Author: | Mick [ Wed Jun 17, 2015 9:37 am ] |
| Post subject: | Re: Lucas MG35 starter motor |
We are only talking a few thou of machining of the commutator here, and there is more than enough brush length to allow for it. Make sure you ask them to undercut the machined commutator as well. There is mica insulate in between the copper strips, and they will machine your brushes down if they are left level with the machined commutator. They may do it automatically, but its not good if they omit to do so. |
|
| Author: | Convertible Mini [ Wed Jun 17, 2015 10:36 am ] |
| Post subject: | Re: Lucas MG35 starter motor |
Mick I have seen these Commutators worn down 2 or 3 mm. Unless The Comm. is worn that much no need to replace Armature. I sell rebuilt Units ready to bolt on. With the correct date (When we have it) Or you can send me yours and I will rebuild it for you. I also rebuild Alternators, Generators and Wiper motors. |
|
| Author: | deluxe67 [ Wed Jun 17, 2015 2:44 pm ] |
| Post subject: | Re: Lucas MG35 starter motor |
The manuals I've read say DO NOT undercut the commutator? Which is it? Any advice on best way to compress the spring to fit the circlip on the end of the shaft on reassembly of the whole unit? It was a bugger to get off and I'm not looking forward to getting it back on! |
|
| Author: | Mick [ Wed Jun 17, 2015 3:18 pm ] |
| Post subject: | Re: Lucas MG35 starter motor |
I couldn't tell you why they say that, but they also say don't rebuild the steering rack or the brake booster as well... If the mica pushes above the line of the commutator, then it will shred the brushes. They may be worried about a build up of carbon in between the contacts, so keep it minimal. |
|
| Author: | drmini in aust [ Wed Jun 17, 2015 4:39 pm ] |
| Post subject: | Re: Lucas MG35 starter motor |
To clarify what I said above, I was talking about `Mini' Lucas starters and armatures. Other brands run Lucas eg Hillman, Ford etc, their armature end details and length may vary. |
|
| Author: | Convertible Mini [ Wed Jun 17, 2015 8:36 pm ] |
| Post subject: | Re: Lucas MG35 starter motor |
Putting Circlip back is so easy when you have the tool that I have. |
|
| Author: | crisonic [ Thu Jun 18, 2015 11:52 am ] |
| Post subject: | Re: Lucas MG35 starter motor |
To get the circlip out I made a little spring compressor out of 2 round plates of 3mm steel , each big enough to have 2 x 1/4 inch bolts 180 degrees apart on the outer edge of the plate . these bolts need to just clear the OD of the spring Nuts were welded on the bottom plate which also had a slot allowing you to slide the plate on between the spring and the pinion. The top plate had a hole in it to fit over the outer end of the shaft. This hole needs to be big enough to be able to get screwdrivers, pointed sticks or what ever to get the circlip out of its recess. Care here, the first on I did sent the circlip somewhere in the garage - never found it. Bolts pass through the top plate to engage the welded nuts on the bottom plate. Its not rocket science and took me 3o mins to make |
|
| Author: | drmini in aust [ Thu Jun 18, 2015 1:55 pm ] |
| Post subject: | Re: Lucas MG35 starter motor |
I machined up a brass bush tool to fit in the tailstock of the lathe, with a slot cut through it. It was safe to use- just hold the armature in the chuck, wind the tailstock in (it acts as a mechanical press) then pry the wire clip off. |
|
| Author: | Convertible Mini [ Fri Jun 19, 2015 7:43 pm ] |
| Post subject: | Re: Lucas MG35 starter motor |
So... Like Dr Mini is saying it is easy. All you need is a Lathe. Every one with a mini has one of those. Huh. |
|
| Author: | Mick [ Fri Jun 19, 2015 10:01 pm ] |
| Post subject: | Re: Lucas MG35 starter motor |
I do some crazy and ill advised things with a vice and lots of levering. It works after a few attempts. |
|
| Author: | drmini in aust [ Fri Jun 19, 2015 10:13 pm ] |
| Post subject: | Re: Lucas MG35 starter motor |
Convertible Mini wrote: So... Like Dr Mini is saying it is easy. All you need is a Lathe. Every one with a mini has one of those. Huh. Tony, my point was safety. You don't need a lathe, nothing is rotating here. I used it as a press, because I have it. The pinion spring is stronger than you think, the stored energy when compressed can do damage if things let go. |
|
| Page 1 of 1 | All times are UTC + 10 hours |
| Powered by phpBB® Forum Software © phpBB Group http://www.phpbb.com/ |
|