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#835443 01/04/21 11:27 am
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O.K. I'm getting organised to put the engine together & as the journals look good, I read the numbers from the back of the shells & saw 030 B, thinking they were 30 thou & I'd replace them. Got the new shells & they are not as thick & narrower. Diameter ID of the shells is also larger.
Seems like the crank has been ground further to 1.6300" with a quick measure with the very nears as I I can't find the wretched micrometer just now.
Numbers on the back of the shells are
6190
030B
SB1029
Anyone have an idea what they are?
According to the part number on the crank it's from 1969.

Duncan


1964/69 A65 Thunderstar:-)
2004 Triumph Sprint RS
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Sorry..... find the wretched micrometer. But you already knew that. You’d never sleep until you know for sue after it’s all back together. ;~)


Down to 1 BSA, 2 Triumphs, 1 '56 Chevy
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Probably a car engine shell and the 30 thou under is not the against same std journal size as the BSA. Best you post of pic of the stampings, if I can make out who made them then the numbers will make more sense.

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I can't get a pic loaded.
I'm wondering if they've used oversize A10 bearings.


1964/69 A65 Thunderstar:-)
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Your best bet in my opinion would be to mic up your journals and buy new shells to suit from a reputable supplier.

in addition, if they are Large journal A10 shells, they are the same as A65.

Last edited by Allan G; 01/05/21 9:11 am.

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68’ A65 Lightning “clubman”
71’ A65 823 Thunderbolt (undergoing restoration)
67’ D10 sportsman (undergoing restoration)
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Quote
I can't get a pic loaded.

Create an account on postimages.org or similar (anyone but photobucket !!!!)

Upload your photo to your images on the site and then use the links to include in your post.

[Linked Image from i.postimg.cc]

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A10 1958-on 67-1430
A10 1956-58 67-1176 & available up to .050"
Maybe it's these.


1964/69 A65 Thunderstar:-)
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I don't reckon it's the big one!


1964/69 A65 Thunderstar:-)
2004 Triumph Sprint RS
GSX1100 Roadrace sidecar
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1964/69 A65 Thunderstar:-)
2004 Triumph Sprint RS
GSX1100 Roadrace sidecar
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[Linked Image from i.postimg.cc]

No makers mark, looks like the 6 1 90 is a date stamp, 030 is the undersize and B stands for bottom. SB1029 will be the shell number which may not be the same as the engine set number hence why searches do not pick it up as its for internal factory use only.

Is there any stampings on the other end of the bearing.

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Nothing there, may have to replace the crank. The thread on the altenator end is a bit dodgy as well.


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Its no doubt been ground under the biggest BSA undersize and a Car shell used, Triumph Sprint engines had one guy buying 80 thou undersize for his Sprint engine rebuilds which was his main business. These were based on a std 1.75" Journal so could be used modified for an A65 but finding them would be difficult as he has retired some years ago.

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The journal can be welded and reground to size. Trade off cost of replacing and having to grind all the journals.


Moderated by  Allan G, Jon W. Whitley 

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