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GaWajn
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Crank model?
« on: April 17, 2015, 07:49:29 AM »
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I have a crank that I though was for a 335 ... it has an NU305 roller on one side ... but a regular 6305 and seal on the PTO end ... with no external end cap for the seal like other 335's I have seen. First time I see one of those. I can't find any information from my parts books.

Anyone know what this is ... and what it fits?
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1970 Ski Doo TNT 292 Bogie (Restored)
1974 Ski Doo Elan (Habs - custom)
mikesskidoo
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Re:Crank model?
« Reply #1 on: April 17, 2015, 08:57:02 AM »
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70'335 did not have the pto bearing/seal cap 71'+ did
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Banoe
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Re:Crank model?
« Reply #2 on: April 19, 2015, 05:26:02 AM »
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Is the PTO shaft 3/4" if so then it is 70' crank.
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GaWajn
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Re:Crank model?
« Reply #3 on: April 19, 2015, 07:33:35 AM »
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Thanks for the info guys!
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1970 Ski Doo TNT 292 Bogie (Restored)
1974 Ski Doo Elan (Habs - custom)
Bones
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Re:Crank model?
« Reply #4 on: April 19, 2015, 07:35:55 AM »
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I believe the only 60s/70s Rotax singles with one roller bearing and one ball bearing are the 71 & up 292,337,340 which all have the PTO end bearing cover.
The 69-318 and 70-335 had a roller on both ends ( no cover plate).
As we know the roller bearings ( NJ305/NU305 ) are expensive. You can use ball bearings on the 69-318/70-335 cranks, it will work OK and save some coin  ( I think the rollers are nicer/better to work with and likely last longer in the vibrating/thumping 70 mm stroke engines.
So....I think likely you have a 70 crank that someone has changed the bearing on one end
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GaWajn
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Re:Crank model?
« Reply #5 on: April 19, 2015, 01:29:36 PM »
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Well now! Isn't that interesting! A crankcase that is not to original specs  hehe!

I will not be using this crank anyways. A friend of mine has been looking for a good bottom end for a 335 with a 3/4 small stub for the longest time ... I think I will just give it to him.

Thanks everyone for the info.
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1970 Ski Doo TNT 292 Bogie (Restored)
1974 Ski Doo Elan (Habs - custom)
dando127
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Re:Crank model?
« Reply #6 on: October 22, 2018, 12:07:24 AM »
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Sorry to revive an old thread, I was reading this and something jogged my memory.  In the 1969 service manual they mention that the first run of 318 motors that went into some Seadoos had one roller bearing and one ball bearing, and dealers were instructed to change to roller bearings if they needed to open up the crank case.



Could that explain the mystery crank???
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