Author Topic: Tightening front sprocket (no torque wrench) (Read 4332 times)

Tubz1983 · « **on:** 14 July 2016, 10:41:23 am »

As title says, I'm swapping out the front sprocket (again), no torque wrench, is this sensible/OK to do? I have a long arm for my standard wrench.
Toby

darrsi · « **Reply #1 on:** 14 July 2016, 11:34:59 am »

Is a bit chancy, you'll either go under which could cause the nut eventually come loose, or go over and mess up the thread.
If the thread was good i would've said it'd be okay but because of the known sprocket nut issues if i were you i'd try and borrow a torque wrench from someone.
With the new 12mm nut it's meant to be 90Nm, although i did mine to 80Nm, as a few others have as well.

Bretty · « **Reply #2 on:** 14 July 2016, 03:57:10 pm »

Why not ask if a local foccer can lend you one? Where in the world is you?

midden · « **Reply #3 on:** 14 July 2016, 04:25:26 pm »

http://www.halfords.com/workshop-tools/tools/hand-tools/sealey-stw1011-torque-wrench-micrometer-style-3-8sq-drive-7-112nm--5-83lb-ft

Tubz1983 · « **Reply #4 on:** 14 July 2016, 04:30:47 pm »

I live in Cambridge Bretty

Adam2201 · « **Reply #5 on:** 14 July 2016, 04:46:46 pm »

On a budget, these beam style torque wrenches are good for £12.00 delivered http://www.ebay.co.uk/itm/DRAPER-1-2-SQUARE-DRIVE-0-21KG-M-OR-0-150LB-FT-POWERSET-TORQUE-WRENCH-34487-/311468687788

They're not as convenient to use as a click-style wrench (you have to get your head level with the arrow when tightening, and make sure the needle is pointing to zero every time you measure something) but mine is as accurate as my Teng (and the Sealey I had before it). Just don't confuse ft-lb for NM!

Megawatt · « **Reply #6 on:** 14 July 2016, 11:30:36 pm »

You don't need a torque wrench. Just ultimate it until you fart and bend the tab washer over. It won't come loose.

darrsi · « **Reply #7 on:** 15 July 2016, 06:37:12 am »

Quote from: Megawatt on 14 July 2016, 11:30:36 pm

You don't need a torque wrench. Just ultimate it until you fart and bend the tab washer over. It won't come loose.

Think you're totally missing the point here, there are very well known thread issues with the front sprocket nut / shaft.
You go too heavy on that with an extended wrench and there's a small chance you could create a world of pain for yourself.
I just don't see the point in taking that gamble.

fazersharp · « **Reply #8 on:** 15 July 2016, 10:47:03 am »

Get yourself a torque wrench, they dont have to be expensive here is a discussion on the subject here that you may find useful in your choice http://foc-u.co.uk/index.php/topic,11878.25.html

Dave48 · « **Reply #9 on:** 15 July 2016, 10:47:30 am »

If you dont want to buy a torque wrench ( I wouldnt be without mine!) why not tighten up so far & ask a local garage mechanic (car or bike) to torque it up to recommended value?

darrsi · « **Reply #10 on:** 15 July 2016, 12:20:26 pm »

If you are willing to do certain jobs on a bike or car then a torque wrench should really be part of your tool kit anyway.
It's not like they're even that expensive to buy, it's just that sometimes things need to be done properly, and because of the front sprocket nut issue this is one of those times.

Megawatt · « **Reply #11 on:** 16 July 2016, 06:18:31 pm »

Having missed the point of a torque wrench and after 40 years working on bikes, I don't understand how the nut can unscrew itself after you've engaged the locking washer on the splines and bent a tab over???? Please explain?

darrsi · « **Reply #12 on:** 16 July 2016, 06:23:59 pm »

Quote from: Megawatt on 16 July 2016, 06:18:31 pm

Having missed the point of a torque wrench and after 40 years working on bikes, I don't understand how the nut can unscrew itself after you've engaged the locking washer on the splines and bent a tab over???? Please explain?

Fill yer boots.......

http://foc-u.co.uk/index.php/topic,92.msg141080.html#msg141080

Megawatt · « **Reply #13 on:** 16 July 2016, 08:48:28 pm »

I asked you to explain as you're the expert.

darrsi · « **Reply #14 on:** 16 July 2016, 11:00:19 pm »

Quote from: Megawatt on 16 July 2016, 08:48:28 pm

I asked you to explain as you're the expert.

Try reading my earlier posts and i think you'll find i did.
As i said before, you're missing the point.

midden · « **Reply #15 on:** 16 July 2016, 11:44:54 pm »

I'm bagging a front row seat for this one

fazersharp · « **Reply #16 on:** 16 July 2016, 11:56:18 pm »

Its true it falls off -- but not on a 98

darrsi · « **Reply #17 on:** 17 July 2016, 12:08:03 am »

Quote from: fazersharp on 16 July 2016, 11:56:18 pm

Its true it falls off -- but not on a 98

I was waiting for you

Dave48 · « **Reply #18 on:** 17 July 2016, 01:56:54 am »

Quote from: Megawatt on 16 July 2016, 06:18:31 pm

Having missed the point of a torque wrench and after 40 years working on bikes, I don't understand how the nut can unscrew itself after you've engaged the locking washer on the splines and bent a tab over???? Please explain?

You can lead a horse to water...............!

Val · « **Reply #19 on:** 17 July 2016, 02:19:17 am »

I was great believer in torque wrenches. Until all my 4 brand new not cheap calibration certificated torque wrenches just stopped working and I have focced up few bolts.

INB4 I was pampering them, never dropped or used them to untighten, kept them untighten too.

Now I just use my hands.Still alive. Make of that what you want.

FYI never seen in any garage that I has been, mechanics to use torque wrenches for high torque bolts like say swingarm bolts. Only for precision low torque like for engine heads.

Megawatt · « **Reply #20 on:** 17 July 2016, 08:50:08 am »

My apologies. Just reread your posts. My 2005 Fazer 1000 has a different nut to the failed ones. I assume the mechanism for failure is a manufacturing fault with the original nut.? Has there been any failures of the gearshaft threads?

darrsi · « **Reply #21 on:** 17 July 2016, 09:27:51 am »

fazersharp · « **Reply #22 on:** 17 July 2016, 12:28:54 pm »

Quote from: darrsi on 17 July 2016, 12:08:03 am

Quote from: fazersharp on 16 July 2016, 11:56:18 pm
Its true it falls off -- but not on a 98

I was waiting for you

Ta Dah !

fazersharp · « **Reply #23 on:** 17 July 2016, 12:30:28 pm »

Megawat - you need to fill out your avatar with the bike that you have and if it had said 1000 we could of said it was only the 600 that had the issue

Megawatt · « **Reply #24 on:** 17 July 2016, 03:45:12 pm »

Thanks mate. I only have my phone and can't do much with it, but I'll have a go.