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#347139 - 12/08/10 6:50 pm Re: Lightning RH conrod seized on me [Re: Maurice R]  
Joined: Sep 2002
Posts: 7,812
Alex Offline
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Alex  Offline

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Seattle
So, that's probably an original '68 pump. According to everything I've found, the doweled bodies didn't come along until 1970 or possibly mid-year '69 at the earliest. Big gear pumps, again, are only listed for the '71 model year.


A smattering:
'53 Gold Flash
'67 Royal Star
'71 Rickman Metisse
'40 Silver Star
'37 Rudge Special
sixtyseventy Lightboltrocket road racer...and many more.
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#347144 - 12/08/10 7:03 pm Re: Lightning RH conrod seized on me [Re: Maurice R]  
Joined: Feb 2008
Posts: 4,050
Tridentman Online content
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Tridentman  Online Content

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Posts: 4,050
New Jersey USA
Are the unit oil pumps---particularly the later improved units---retrofittable to the pre unit A7 and A10 models?
Thanks in advance for any info.

#347146 - 12/08/10 7:19 pm Re: Lightning RH conrod seized on me [Re: Maurice R]  
Joined: Oct 2007
Posts: 1,512
Ignoramus Online content
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Ignoramus  Online Content
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Joined: Oct 2007
Posts: 1,512
Auckland NZ
Maurice:
sounds like the motors in good hands.....If you are going to rebush a std steel outer main bearing with "bronze" thats fine, but the only comment I would make is that saying "bronze" is a bit like saying "wood" there are dozens of types of bronze available some are not suitable for that application. For example aluminium br would be too hard IMO.

Some of the "leaded gun metal" bronzes would be ideal IMO.

its the sort of thing that could be debated endlessly so i suggest you do a little reserch on grades of bronze before you settle on the material to use.

If it all gets too much plain old school phosphor bronze will get you by but its still slightly to hard IMO.


"There's the way it ought to be and there's the way it is" (Sgt Barnes)
#347150 - 12/08/10 7:38 pm Re: Lightning RH conrod seized on me [Re: Alex]  
Joined: Aug 2001
Posts: 4,956
Rich B Online happy
Rich B  Online Happy



Joined: Aug 2001
Posts: 4,956
Stone Creek OH USA
Early 69 and some 68's have longer gears. There seems to be at least 2 different length of gears used in the later pumps.

Doweled pumps from what I can tell actually started in 69. There are at least 2 versions - 1 dowel (D) & 2 dowels (DD). Though I have D pumps that have 2 dowels eek

Tridentman,

From what I have played with, the body and gears can be used on an A10. But you need to use the A10 input drive and housing. The A10 has a vastly different arrangement for the OPRV and main bearing oil supply. IMO, it is better and with cold oil, I have my doubts the OPRV even works eek


Life is too short to drink cheap, bad beer.
#347152 - 12/08/10 7:39 pm Re: Lightning RH conrod seized on me [Re: Maurice R]  
Joined: Dec 2010
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Maurice R Offline
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Maurice R  Offline
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Posts: 15
Miramichi, N-B, Canada
I found this here p# 68-0625, witch is described as (BUSH,RH CR,66ONA50/65,STD,BRON), and there is p# 68-0625/A, witch is described as (BUSH,RH CR,66ONA50/65,STD,2PC*). Now, I would assume that this 2pc bush would be the steel bush with a bronze insert, right? But this 68-0625 bush, is it the bronze insert for that 2pc or is it a one solid bush that replaces the 2pc one?

#347156 - 12/08/10 7:54 pm Re: Lightning RH conrod seized on me [Re: Maurice R]  
Joined: Feb 2008
Posts: 4,050
Tridentman Online content
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Tridentman  Online Content

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New Jersey USA
Rich B--thanks for info.
When not Tridentman my real name is also Rich B.
Reason for question is that I have a 1960 A7SS that I am thinking of pulling down and possibly upgrading while it is down.
Thanks again for info.

#347157 - 12/08/10 7:55 pm Re: Lightning RH conrod seized on me [Re: Maurice R]  
Joined: Dec 2010
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Maurice R Offline
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Maurice R  Offline
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Miramichi, N-B, Canada
Sorry on that P#, it is actually 68-0657

#347167 - 12/08/10 9:25 pm Re: Lightning RH conrod seized on me [Re: Maurice R]  
Joined: Aug 2001
Posts: 4,956
Rich B Online happy
Rich B  Online Happy



Joined: Aug 2001
Posts: 4,956
Stone Creek OH USA
Maurice

The genuine BSA timing side main bearings are 2 piece. A steel outer housing and a bi metal type bearing insert. A dowel pin was used on the later bearings to prevent movement of the actual bearing within the housing. Only the early timing side main bearing intended for the ball bearing engines were supplied by BSA with no dowel pin. P/N for that bearing is 68-15.....it won't fit your engine anyway due to the thick shoulder. Don't use one even if it is free eek Though they are a good source for a standard size insert.

The main bearing intended for the roller bearing engines like yours used a thinner shoulder and a thrust washer.

Some of the aftermarket 2 piece bearings supplied today do not have the dowel pin installed. I would never use a bearing with out a dowel pin. Save your old bearing in case you need the dowel pin.

The 1 piece bronze bearings were never supplied by BSA. It is strictly an aftermarket piece. Quality does seem to vary a bit.


Life is too short to drink cheap, bad beer.
#347168 - 12/08/10 9:30 pm Re: Lightning RH conrod seized on me [Re: Maurice R]  
Joined: Dec 2010
Posts: 15
Maurice R Offline
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Maurice R  Offline
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Joined: Dec 2010
Posts: 15
Miramichi, N-B, Canada
Come to find out that if you want to replace the insert in the 2 piece bushing, you can, if it's standard bore. Through British Cycle Supply they have a 423-68, witch is a standard bore insert, but here is the catch, there is no dowel available, part # for dowel would be 67-0793.

If you guys have another source or supply for this dowel it would really come in handy or ever an old trick up your sleeve for removing the dowel without damage. Even if you guys have another way of making one from scratch that would be handy too.

#347169 - 12/08/10 9:57 pm Re: Lightning RH conrod seized on me [Re: Maurice R]  
Joined: Sep 2002
Posts: 7,812
Alex Offline
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Alex  Offline

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Posts: 7,812
Seattle
According to the parts manuals, all unit twins used the same length pump gears through the 1970 model year. I've gone through and tabulated all of the parts and the driven gears all had the same part number up to and including the 1970 model year. This is confirmed by pumps I've taken out of motors which I believe to be original. It's possible that, like many other things, there were mid-year changes, but I think most of these changes coincided with the model years.

Here is the breakown by year:


A smattering:
'53 Gold Flash
'67 Royal Star
'71 Rickman Metisse
'40 Silver Star
'37 Rudge Special
sixtyseventy Lightboltrocket road racer...and many more.
#347174 - 12/08/10 10:49 pm Re: Lightning RH conrod seized on me [Re: Maurice R]  
Joined: Dec 2010
Posts: 15
Maurice R Offline
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Maurice R  Offline
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Posts: 15
Miramichi, N-B, Canada
Wow, this is pretty cool information. Is there a board especially for this info? If not there should be one, you know like an FAQ about technical stuff, classed by bike brands and then by sections.

#347195 - 12/09/10 12:48 am Re: Lightning RH conrod seized on me [Re: Maurice R]  
Joined: Dec 2002
Posts: 3,227
leon bee Offline
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leon bee  Offline
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Posts: 3,227
arkansas
You just gotta read here everyday and try to remember stuff and hope the search works and that the whole board doesn't get wiped out like it did a few years ago. I can remember stuff about 2 months.

#347244 - 12/09/10 9:18 am Re: Lightning RH conrod seized on me [Re: Maurice R]  
Joined: May 2004
Posts: 3,548
BSA_WM20 Online content
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BSA_WM20  Online Content
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Joined: May 2004
Posts: 3,548
Sydney Australia
Quote:
Wow, this is pretty cool information. Is there a board especially for this info? If not there should be one, you know like an FAQ about technical stuff, classed by bike brands and then by sections.

Yes it is called your hard drive.
Hit the "save as" and store it as a web archive to preserve formatting and images


Bike Beesa
Trevor
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