A Tough Nut to Crack! By technoglide (Read 1,889 times)

[technoglide]

Hi Friends,

I haven't been here for awhile as the weather is too cold to work on my scoot. But we had a couple warm days here in the ATL, so I rounded up my friends to conquer this problem. I’m overhauling a Roketa MC-54-250B with the Linhai engine. I'm currently working on the CVT assembly. I have good reason to believe the clutch needs to be replaced or at least degrease.

I was able to remove the front assembly pretty easily. The amount of grease on the rollers was phenomenal. My local scoot mechanic said he had never seen grease in ANY roller assembly EVER before. I have cleaned everything I can get to so far. Pictures of assembly
are at Photobucket address below. I NEED TO REMOVE THE CLUTCH ASSEMBLY OUTER NUT!

Problem: I have used every method I know, including: 3 guys - 1 holds the chain wrench around the bell, one pushes the 4ft breaker bar down to loosen the nut, and one guy holds the socket/extension straight so as not to strip the nut. No dice. Unbelievable!

We also tried the same method without a chain wrench. I took the scoot off the center stand, sat on the scoot, and held both brakes tight while my buds repeated the last process. This time it turned slowly, about 2/3 of a turn. But I'm FAIRLY? sure it wasn’t the desired nut turning. At least that was our perception. I have no Idea what else could be turning. But it can't be good, so we stopped after that.

5 Questions:

A) What could have been turning in the last scenario, if not the nut? Is it damaging?

B) How can I get this nut off without trashing it? It’s already a bit buggered-up.

C) Assuming I can’t do anything with it, Can I use a nut breaker on it, as the nut has a wide beveled edge as well as the normal 6-sided area? (See pics).

D) What is the part number, specs, and/or name of this exact nut?

E) Where can I get another nut?

Grateful as always,

Andy (technoglide)


s1035.photobucket.com/albums/a438/technoglide/Roketa%20MC-54-250B/CVT%20transmission/Clutch%20nut%20removal/

[tvnacman]

well just hold the bell with two hands , and tap the bolt with an impact gun and it comes off no damage.

as far as what was turning I would think you stripped a gear in the trans , maybe you might get lucky . let some of the others chime in .

[Alleyoop]

The only other thing is to Heat it up to break the Loc-tite they put on it and that should do it.
I use an impact wrench myself.
Alleyoop

[tvnacman]

Alley , I just replaced my clutch ,,, I put a socket on the impact gun put it on the nut I had a third party hold the gun , I grabbed the bell with two hands and told the third party to tap the nut came off like the third hit , then reversed it to put back on , I layed into it with the gun putting it back together . I bought the whole assembly pully and bell and changed the whole thing . It took longer to take the cvt cover off and on then anything else . Now at my leasure I can rebuild the clutch . I just have to find springs and pressure plates

John

[Alleyoop]

Thats what I did as well I bought an entire Clutch and put on the Oil Filter tool on the Bell and just hit it with the impact wrench about 3 times and it came loose. Did the same thing when I put the new one on.

Then I ordered a Performance Clutch and took apart the Old Clutch and put on the New Performance Clutch on and it is ready to put on. I am having a 62mm BBK and +2mm Stroker Crank (180+ccs) put in with taller gears and will put on the Performance clutch then. I will be trailering my Trike up in about 2 weeks to have it done.
Alleyoop

[tvnacman]

nice!!!!!!

[technoglide]

Thanks GentleFolk!

I have been away from a PC for a long time, so I am late in reading/thanking everyone. As always, much gratitude for the great and friendly info. Hope I didn't strip any gears. We'll see. I will buy an impact wrench and borrow a compressor, heat up the nut, and go crazy. Meantime, I ordered a couple replacement nuts from scooterpartsmania. They will be shipped on a slow boat from China, so I will report back in a month or so. Thanks again, Technoglide (Andy)

[tvnacman]

a 6 point socket and an impact gun will make quick work of that nut forget about heat ...

[Alleyoop]

TechnoGlide,
Get an 120V Impact Wrench, thats what I use it works great, you can get them pretty cheap at Harbor Freight. I have used it many times taking my Variator out to change weights as well as the Clutch. You do not need one that requires AIR.
Alleyoop
www.harborfreight.com/1-2-half-inch-electric-impact-wrench-45252.html

[technoglide]

Thanks Alleyoop,

I finally got it off a few weeks ago. We had used an electric impact wrench prior to my post. (I may have omitted that!) Finally a friend with a compressor dragged it over, and I borrowed an air-driven impact wrench. That friggin' nut was off in 2 seconds! Victory!

I believe I'll invest in a small compressor and impact gun. I'm reassembling now. The rear nut (clutch side) was pretty beat-up. I had bought 2 nuts from a supporting vendor. The shipping was free, they came from China. It took a long time, but I had a long time. (It being winter still).

I swear I'm an idiot. I never tried them for fit. Of course the thread size was wrong. I hate putting a badly mauled nut on the the thing. I wonder where I can buy those correct nuts for the Linhai MC-54-250B, and get them within a week or so.

I have a Yamaha manual for the comparable scoot. Good god!. I never realized there were so many picky rules n' things to observe. I'm losing my innocence!

Thanks for all your help!

[jhbietz]

I use a 1/2 inch impact and do it by myself. Heat can help!

[fairweasel2323]

I tried to get mine lose with a air compressed impact gun no luck at all!!! I thought maybe the gun was junk cause it was old or maybe our Sears Roebuck compressor was out of date since they are all now Craftsman name brands not been labled sears for a long time lol! but maybe ill try heating the bolt up to weaken the Locktite I didnt think of that. But our air compressor will only pump up to 60lbs outlet pressure dont think my Dad has done any maintaince to it since he got it!

[pudntane]

Mar 21, 2011 19:57:01 GMT -6 technoglide said:

Thanks Alleyoop,

I finally got it off a few weeks ago. We had used an electric impact wrench prior to my post. (I may have omitted that!) Finally a friend with a compressor dragged it over, and I borrowed an air-driven impact wrench. That friggin' nut was off in 2 seconds! Victory!

I believe I'll invest in a small compressor and impact gun. I'm reassembling now. The rear nut (clutch side) was pretty beat-up. I had bought 2 nuts from a supporting vendor. The shipping was free, they came from China. It took a long time, but I had a long time. (It being winter still).

I swear I'm an idiot. I never tried them for fit. Of course the thread size was wrong. I hate putting a badly mauled nut on the the thing. I wonder where I can buy those correct nuts for the Linhai MC-54-250B, and get them within a week or so.

Dr.JR kindly sent me a Yamaha manual for the comparable scoot. Good god!. I never realized there were so many picky rules n' things to observe. I'm losing my innocence!

Thanks for all your help!

I believe JCLUSA will have your part. Check it out at www.jclusa.com

[Bashan]

If you don't want to invest in a whole air compressor, get a 10 or 12 gallon portable air tank and fill it to about 120 PSI with a little air station or small Kobalt compressor. For the few pops you need off a an impact it works great. Rich