Mk3 Crankshaft Disassemble, clean Reassemble
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There are some good comments in this 2009 AN thread:
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any tips on crank assembly?
any tips on crank assembly?
I'm going to disassemble the crankshaft on my 850 MKII and clean the sludge trap. I have a new set of hardware comming in the mail. The factory manual describes the procedure but I've never been inside one of these before so I'm asking if there are any danger areas to be aware of or hard earned...
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Fast Eddie
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You’ve basically got two choices: by / make attachments that allow use of a torque wrench, or do by hand with wrenches.
99.9% of all Norton cranks ever built, were built with wrenches.
If you put a bolt in a vice and tighten a nut onto it, and test it with a torque wrench, you will very quickly learn to calibrate the required torque by feel using wrenches.
Nothing wrong with going the torque wrench attachment route if you so wish, it’s just not really necessary.
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The 850 Mk3 crank doesn't use them as it has an extra stud* (with washers) in place of the dowel.
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*(Mk3 studs are 3/8" diameter)
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Also, according to the 850 Mk3 manual, "early dispatches" had a shouldered 7/16" diameter (3/8" threaded) stud.
Possibly all the 7th studs are shouldered 7/16" or there would have been two different Mk3 crankshaft assemblies?
Possibly all the 7th studs are shouldered 7/16" or there would have been two different Mk3 crankshaft assemblies?
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?
The three dowel studs are all threaded 3/8" (UNF).
Only the 7th stud is shouldered 7/16".
The other two dowel studs are 3/8".
Motorcycle parts and spares for Norton motorbikes - Genuine Andover Norton Spare Parts - Andover Norton Motorcycles Parts - Original Andover Norton Parts
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lcrken
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I torque them using home made offset adapters like the middle one in the picture below. This one os for torquing cylinder base nuts, but I've made similar ones for other sizes.
Similar wrenches available commercially, like the ones here from Mcmaster Carr
www.mcmaster.com
Also available from Amazon, just search for torque adapters. Or from Snap-On, etc.
Ken
Similar wrenches available commercially, like the ones here from Mcmaster Carr
McMaster-Carr
McMaster-Carr is the complete source for your plant with over 595,000 products. 98% of products ordered ship from stock and deliver same or next day.
Also available from Amazon, just search for torque adapters. Or from Snap-On, etc.
Ken
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lcrken
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I see the 243 is :
" medium-strength Blue threadlocker
- use with 1/4″ to 3/4″ bolts.
- temperature range maxes out at 360°F.
- remove them with standard hand tools.
One major difference is that Loctite 243 comes with significantly improved oil tolerance. Even if your threads are a little dirty and oily, it’s not a big deal. No need to use any primers on plated fasteners either..."
Loctite Threadlocker Types Explained: A Full Guide
Loctite - a household's best friend. Yet all the confusing Threadlocker serial numbers can leave you frustrated and helpless. Don't worry - I'm here to help and point out the differences!
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SteveA
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Fascinating! I had a MkIII crank in MkIII cases in the race motor I built in 1975/76. I don't remember the '7th stud' at all. But that is what time does for you.The 850 Mk3 crank doesn't use them as it has an extra stud* (with washers) in place of the dowel.
Andover Norton Parts Drawings - Genuine Andover Norton Factory Parts - Commando Parts
Andover Norton Parts are the only Norton spare parts in the market manufactured to original drawings, within the factory-approved tolerances, from the correct materials, and with the correct finish.andover-norton.co.ukMotorcycle parts and spares for Norton motorbikes - Genuine Andover Norton Spare Parts - Andover Norton Motorcycles Parts - Original Andover Norton Parts
Motorcycle parts and spares for Andover Norton motorbikes: Andover Norton manufactures and supplies all Genuine Factory Spare Parts for Norton motorcycles built before 2002.andover-norton.co.uk
*(Mk3 studs are 3/8" diameter)
I now have a Maney crank in Maney cases. Steve didn't use the 7th Stud, he used a dowel, but he didn't drill the dowel size right through the webs, so the webs retain the dowel and you don't need the tabs.
He didn't use tabs washers at all, red Loctite, yes.
As mentioned elsewhere he also went to 12 point nuts later, as I have done, lock tabs would not be much use on those.
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