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November 14, 2018, 10:22:15 AM
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   Author  Topic: 72 tnt chaincase  (Read 244 times)
pingu
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72 tnt chaincase
« on: December 5, 2017, 08:05:43 PM »
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Is the 340 tnt chaincase the same as the 292, not worried about gearing but the actual chaincase itself. Thanks for any insight.
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Re:72 tnt chaincase
« Reply #1 on: December 5, 2017, 08:22:22 PM »
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Cover is the same, but actual chain case is a different part number than 340/440.
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pingu
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Re:72 tnt chaincase
« Reply #2 on: December 6, 2017, 04:46:52 PM »
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Good news, thanks.
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cdem72
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Re:72 tnt chaincase
« Reply #3 on: December 14, 2017, 08:20:54 AM »
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I think in '72 the 340 is a twin and the 292 is still a single so there will be an offset for the chaincase for allignment or bearing cup holder is slightly longer because of this.
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'62 tincab; '69 399 T'NT; '70 292, 340 bliz, 340 T'NT; '71 246, 291 bliz, 440, 640, 775 T'NT; '72 293, 340, 440 bliz; '73 345 bliz, '74 440 T'NT, '75 245 rv
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Re:72 tnt chaincase
« Reply #4 on: December 14, 2017, 07:20:39 PM »
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Pingu....Are you trying to use a 292 case for a 340T or use a 340T case for a 292 ??
You can not use a 292 for a 340 but you can use a 340 case for a 292 
Cdem72 mentions the off set, for the welded steel cases, yes, they had a integral off-set, but the aluminum cases used a plastic spacer for the off-set for the twins, so......The twin chain case has a much longer bearing pocket ( on the lower end). If you try to use a 292 case for the twin with the off-set the pocket is too short.
When using the twin case for a single the axle bearing is in a fair depth and installing the seal is tricky as there is no backing.
I have a twin case on one of our 335 lunger racers, it works fine, the axle seal is actually fairly close to the drive sprocket on the axle 
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pingu
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Re:72 tnt chaincase
« Reply #5 on: December 15, 2017, 05:47:47 PM »
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Using a 340 chaincase on a 292 build, so sounds possible. Thanks for the details on the bearing housing being longer. As always, great advice here.
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