Jockey Journal Forum banner
1 - 3 of 3 Posts

·
Registered
Joined
·
183 Posts
Discussion Starter · #1 · (Edited)
i have 2 sets of triumph pre-unit cases. both are supposed to be 1950 6t cases. my confusion is in the drive side bearing. if you look at the drive sides of the cases it's clear they have different bearing holes and the one on the left has had the bearing saddle welded. anyone have any oppionions? i can't tell if the one on the left is a re-stamped later pre-unit case or if it is a 50 case with later bearing saddle weded in? maybe it was moded to accept later unit cranks? anyone give me some insight? the only other thing i can find different about the case pictured on the left is that on the outside of the case under where the generator would mount there is a xx stamped into it and on the other (right side of pic) no markings. any info would be a big help. thankshttp://www.imagestation.com/album/pictures.html?id=2118754277&idx=14

http://www.imagestation.com/album/pictures.html?id=2118754277&idx=14
 

·
Registered
Joined
·
2,574 Posts
Sounds like you have a big bearing crankcase and a small bearing crankcase or someone's attempt to change them to that. Or mismatched cases. The way to tell is to feel under the timing cover on the case, is there a "bump" or not. Sometime between 1950 and 1953 ( I forget the year or month) Triumph uppped the timing side main beariing to the same size as the drive side bearing and went from a one inch main, timing side bearing journal to a 1 and 1/8 inch timing side journal. Mixing and matching on the early crank case is getting harder and harder because of the availability of the bearings that let you put a later crank in an earier set of cases, that is the 1 and 1/8th ID bearing in the earlier "non-bump" crank-cases). Once a popular thing to do, that coversion is getting lost in the mists of time.

Some guys simply changed out the timing side case half to get the bigger bearings and later crank. You may have this as well

Send me the numbers on the case and i can pinpoint year and probably month of mnfg. [email protected]
 

·
Registered
Joined
·
183 Posts
Discussion Starter · #3 ·
doh! i can't believe i posted the wrong pic! the pic i was supposed to post is this

http://www.imagestation.com/album/pictures.html?id=2118754277&idx=14

this will show the difference in the drive side bearing. can you take a peak? i appreceate the info also! i'm in the begining stages of this pre-unit build and it's a whole world different from my last unit. THANKS
 
1 - 3 of 3 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top