1933 Matchless D5 main bearing

Information relating to Matchless and AJS Models built prior to 1939
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pinsaultph
Posts: 2
Joined: Tue Feb 06, 2024 1:41 pm
Location: France

1933 Matchless D5 main bearing

Post by pinsaultph »

Hi!
First I introduce myself : I'm the moderatly happy owner of a 1933 Matchless D5 (500 cc side valves). Moderatly because it should have been running well when I bought it and it needs a rather complete overhaul... Anyway it's a beautiful bike!
https://drive.google.com/file/d/11WgZzt ... drive_link
https://drive.google.com/file/d/13q0a87 ... drive_link
I hope you will see the pictures...

I need to take care of the cylinder and the piston (as there isn't any compression) and as I have removed the engine from the frame I have had a look on the crankshaft (you know what I mean, step by step, you have a basket full of bits :D ). The crankshaft itself is quite good but the main bearing is less smooth than I think it should. Do you know where I could find one?
Here is the picture : https://drive.google.com/file/d/1Gx74WL ... drive_link
Thanks
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Duncan
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Posts: 2128
Joined: Thu Jul 10, 2003 1:00 am
Location: HAMPSHIRE UK

Re: 1933 Matchless D5 main bearing

Post by Duncan »

I'm afraid that I cant answer your question but can provide a couple of potential lines of enquiry:
  • Could the cage be dismantled and new rollers inserted?
pinsaultph
Posts: 2
Joined: Tue Feb 06, 2024 1:41 pm
Location: France

Re: 1933 Matchless D5 main bearing

Post by pinsaultph »

Thank you for the addresses.
I don't really know how the sides are fitted to the frame and the side on the crankcase is a bit worn. Apparently, there is no washer between the crankcase and the bearing. The lateral play is set up by the position of the timing side bush.
I have received an answer from the vintage bearing co. They don't have the bearing but maybe the rollers. I will have a look on how this bearing is done. ;)
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