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Post by rockynv on Jan 27, 2016 1:50:51 GMT -5
Personally I see nothing wrong with *loosening* a variator nut with an impact even if you have the "right" tools. Isn't it only tighening that we should try not to do? Even with the impact wrench you still should use a locking tool to shield the crank or drive gears from the impacts while removing the nut. Most people however do not have the hand strength to hold the variator 100% securely and then there is the chance of repetitive injury to ones hand from holding against the impacts along with the danger of circulatory and nerve damage that is becoming so prevalent. So many young people are coming down with things like Reyes Syndrome and the like where the circulation shuts down to their extremities after a brief shock of cold such as from holding a soda can which sometimes requires being rushed to the emergency room due to the risk of stroke and these are all being traced back to improper use of equipment which subjects the user to vibrations such as impact wrenches, air chisels, sanders, grinders, blowers and weed trimmers especially if the user is not physically up to it which is sadly becoming the majority. Yes when putting things back together on the engine or transmission shafts you should use a locking tool and hand wrench. |
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Post by steve on Jan 27, 2016 14:51:49 GMT -5
Personally I see nothing wrong with *loosening* a variator nut with an impact even if you have the "right" tools. Isn't it only tighening that we should not to do? I am scared of not getting the nut on tight enough. I hand tightened them once, and my clutch came off. |
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Post by rockynv on Jan 28, 2016 5:03:36 GMT -5
Personally I see nothing wrong with *loosening* a variator nut with an impact even if you have the "right" tools. Isn't it only tighening that we should not to do? I am scared of not getting the nut on tight enough. I hand tightened them once, and my clutch came off. Did you tighten them to spec using a torque wrench? Be mindful that too tight can be much worse than too loose. Each fastener has a torque limit at which it starts to loose integrity and stretch which weakens it making it more prone to distorting, vibrating and snapping off when under a load. Once you have compromised a fastener by over tightening it or galling it then even when torqued correctly it may still continue to stretch. People view this as the nut coming unscrewed however many times it is the bolt itself elongating because its tensile strength has been compromised. You hear people complaining about nuts that came loose even though they used thread locker on them and in truth the nut may not be unscrewing but the bolt itself can be stretching. Some clutch nuts used to hold on variators and such are one time use and need to be replaced with new ones each time you remove them for service. A while ago I was looking at a pretty nice low mileage CPI motorcycle that had been compromised with an impact wrench when they put the variator back on and the end of the crankshaft had been stretched enough that it broke off on the first ride at over 45 mph. The crank shaft had to then be replaced. |
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Post by geh3333 on Jan 28, 2016 7:31:10 GMT -5
The good thing is that its the nut that usually strips out not the shaft " at least on these scoots " I myself have never seen the crankshaft or the clutch shaft strip before the nut. And yes I'm talking about the threads.
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Post by steve on Jan 28, 2016 9:21:45 GMT -5
Now I am scared I have damaged my crankshaft.
I do not have torque wrenches. I am a backyard warrior.
I suppose I need to get some, but where do I find the information on proper torque settings for clutch and variator nuts on Chinese 50cc scoots?
I just set my impact on the lowest torque setting, which is "1", it goes to 3. That has always held the nut on.
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Post by JerryScript on Jan 28, 2016 10:34:25 GMT -5
Now I am scared I have damaged my crankshaft. I do not have torque wrenches. I am a backyard warrior. I suppose I need to get some, but where do I find the information on proper torque settings for clutch and variator nuts on Chinese 50cc scoots? I just set my impact on the lowest torque setting, which is "1", it goes to 3. That has always held the nut on. I would not worry, the main damage you could cause would be stripping the threads on the end of the shaft. The possibility of damage to the rest of the crank comes from actually spinning the crank a bunch with the impact. |
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Post by geh3333 on Jan 28, 2016 11:42:08 GMT -5
Now I am scared I have damaged my crankshaft. I do not have torque wrenches. I am a backyard warrior. I suppose I need to get some, but where do I find the information on proper torque settings for clutch and variator nuts on Chinese 50cc scoots? I just set my impact on the lowest torque setting, which is "1", it goes to 3. That has always held the nut on. I would not worry, the main damage you could cause would be stripping the threads on the end of the shaft. The possibility of damage to the rest of the crank comes from actually spinning the crank a bunch with the impact. I agree 100% . and like I said , I myself have never seen the crank threads strip. Most of the time the nut threads will strip first. I imagine the nuts are a softer metal. Also , if your spinning the crankshaft with an impact , your putting the nut on too tight. It only takes a few hits with an impact and you should hold the variator " drive face " with your hand. This way the crank shaft should only move a tiny bit. Over 4 years of wrenching on the CVT , I've removed the variator at least 200 times . I constantly would tune the CVT , clean the variator , change belts and whatnot . I have never done any damage to the crank shaft with my 8 amp electric impact. I'll post o pic of the beast . |
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Post by rockynv on Jan 28, 2016 13:33:07 GMT -5
Torque wrenches are relatively cheap now and you can go by the Honda specs or call the distributor. I have had very good support from Lance as far as specs and beyound even having them advise when the specs are too high so that they reccommend an alernate lighter setting. Between bikes, cars, industrial machinery and construction equipment I have been at this over 45 years.
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Post by gy6er on Jan 30, 2016 18:31:16 GMT -5
I bought a cheap heavy single anvil craftsman,best IMO cause you can do small single wacks at a time and of course then there's the lighter air pressure so seems safe to me. It does take practice to know what your doing,but I hate to think of someone learning with out a cheap single (heavy) single anvil one.
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