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#362030 - 03/09/11 7:39 am Crankshaft EN16B?  
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toreador Offline
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Kansas City
I am a little confused by this crankshaft I got with my old 650 project. It's a later one piece crankshaft for a twin, and the only markings I could find on it are EN16B. I can't seem to find this in my parts books. The only 2 things I could find online are either what is listed for a 1959 Bonneville (which my 1959 parts book does not confirm, but this website says it was http://www.classic-british-motorcycles.com/1959-triumph-bonneville.html) or later 70's Triumphs, which the only reference I could find was for a 1975 Triumph trident with that part number on a crank (which it cannot be!). Anyone have any more information or ideas about it?


1951 Triumph sprung hub 6T bitsa, 52 motor with a 1 piece crank. (it's a 51, 52, 53, 54,...)
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#362034 - 03/09/11 8:24 am Re: Crankshaft EN16B? [Re: toreador]  
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Pete R - R.I.P. Offline
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Pete R - R.I.P.  Offline
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EN16B is a grade of manganese-molybdenum alloy steel.I don't think this has anything to do with part numbers.

#362104 - 03/09/11 5:49 pm Re: Crankshaft EN16B? [Re: toreador]  
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RF Whatley Online content
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RF Whatley  Online Content
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I agree with Pete. I believe the "EN" is a English or European alloy steel designation. Triumph was probably experimenting with several alloys and marked the cranks in case they started breaking in whopping big numbers 4 years later.


Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA

"Shop Boy" at Rodi British Bikes
#362111 - 03/09/11 6:14 pm Re: Crankshaft EN16B? [Re: toreador]  
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Tridentman Online content
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EN= European Number(to paraphrase the German).
Introduced in 1988 to replace the previous national (UK, German etc) designations for steel alloys.
HTH

#362112 - 03/09/11 6:15 pm Re: Crankshaft EN16B? [Re: toreador]  
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toreador Offline
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Interesting. That would make sense, and kind of falls in line with the article.

Any idea on what year or years of crank this may be? It's one piece, the 2 timing marks, threaded both ends. I can't find any other identifying marks on it.



1951 Triumph sprung hub 6T bitsa, 52 motor with a 1 piece crank. (it's a 51, 52, 53, 54,...)
#362118 - 03/09/11 6:38 pm Re: Crankshaft EN16B? [Re: toreador]  
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DMadigan Online content
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1988? My '71 BSA parts book lists certain bolts and other pieces as EN16, EN24, et cetera. Perhaps the UK was ahead of its time?

#362122 - 03/09/11 6:57 pm Re: Crankshaft EN16B? [Re: toreador]  
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Kansas City
And that 1976 crank in the triple called an en16b, so maybe it started rather early.


1951 Triumph sprung hub 6T bitsa, 52 motor with a 1 piece crank. (it's a 51, 52, 53, 54,...)
#362161 - 03/09/11 10:20 pm Re: Crankshaft EN16B? [Re: toreador]  
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EWebster Offline
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Emergency Number = WWII

#362178 - 03/09/11 11:32 pm Re: Crankshaft EN16B? [Re: toreador]  
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John Healy Online content
John Healy  Online Content



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Quote:
Emergency Number = WWII


For this series of steel, yes!

If you check a Machinists Handbook of the WWII era, you will find reference to the EN (Emergency Numbers) and the equivalent SAE numbers.

But Trident man is right too, they homologated European steel numbers into a system that looked a lot like the SAE system and they used the prefix EN.

SAE numbers and the earlier EN # system.
http://www.ambhe.com/technical_info/grades%20of%20Rounds.htm
and an other:

http://www.edi.com.tw/MaterialCode.php?T=SteelRange

extensive list of the BS970 list of EN numbers and there composition:

http://www.rolexmetals.com/sdp/191736/4/cp-4928249/0/BS970_Specifications.html

and the modern European EN #:

http://www.keytometals.com/articles/art22.htm


#362345 - 03/10/11 10:48 pm Re: Crankshaft EN16B? [Re: toreador]  
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toreador Offline
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Kansas City
Okay, from wild guessing this seems like it should be a 1968-69 crankshaft. It has the TDC mark, and the timing mark, which were added in 68, but the whole crank was changed in 70, correct?

The reason I am asking is the sludge tube. I can't seem to get it to line up correctly with the bolt on the flywheel. If I insert the tube all the way, the single hole can barely be seen through the hole in the flywheel. Should this hole line up perfectly? Was there a different sludge tube in the 68-69 flywheel?


1951 Triumph sprung hub 6T bitsa, 52 motor with a 1 piece crank. (it's a 51, 52, 53, 54,...)
#362351 - 03/11/11 12:10 am Re: Crankshaft EN16B? [Re: toreador]  
Joined: Mar 2005
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John Healy Online content
John Healy  Online Content



Joined: Mar 2005
Posts: 9,964
Boston, Massachusetts
Quote:
Was there a different sludge tube in the 68-69 flywheel?


No! All after market parts are made equally. That is why a competent British mechanic's tool box has a draw full with every size, type, and shape of file available in the Modern world.


#362375 - 03/11/11 4:01 am Re: Crankshaft EN16B? [Re: toreador]  
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Kansas City
Well the one that came with the engine was all gunked up and had scrape marks on it. Wasn't in it, so can't be sure it was. Bought an aftermarket, and I get exactly the same result. Normally can you just user your finger to seat one correctly, or do you ever have to do anything to get it to seat further in? Should it just slide in, or should I ever have to tap it the rest of the way in? Just don't want to make it any rougher for the next person wink


1951 Triumph sprung hub 6T bitsa, 52 motor with a 1 piece crank. (it's a 51, 52, 53, 54,...)
#362406 - 03/11/11 12:11 pm Re: Crankshaft EN16B? [Re: toreador]  
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Dick Harris Online content
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It's normal to have to "tap" it in until the hole lines up for the insertion of the bolt. Dick


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