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Post by midlifecrisisrd on Jul 3, 2013 16:24:18 GMT 1
Split the DT125 cases and replaced the mains and seals. All went well and seamed easier than expected.
Cases back together and re fitting the gears and bits behind the RH case. Haynes manual says primary drive nut, clutch centre nut and balance shaft nut all 47 ft lb.
My arse, balance shaft threads now gone which means trying to find another and splitting the cases again.
Not happy!!!!
Anybody know the proper torque?
Steve
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Post by steeley on Jul 3, 2013 18:12:38 GMT 1
hi the book I have,clutch centre nut 51 foot lbs primary drive nut 58 foot lbs balancer shaft nut 40 foot lbs generator rotor nut 58 foot lbs .hope this is of help.
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Post by midlifecrisisrd on Jul 3, 2013 20:53:43 GMT 1
Cheers for that, what model is that for?
Anybody got any different settings in their manual? 40 still sounds heavy for such a fine thread.
Steve
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Post by steeley on Jul 3, 2013 21:33:22 GMT 1
steve ,the book I have is a Haynes one .models covered are tzr 125,87 to 93 dt 125r and x 88 to 07. striped and built a few of these and have no problems with striped threads.
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Post by icarus001 on Jul 3, 2013 21:44:20 GMT 1
I assumed this was a thread about a Haynes manual on how to look after your bollocks properly.
I only clicked on to see if there were any tips on how not to nick your ball sack when you're shaving them, it bleeds like a b*****d.
I tried Imac but it felt like my tackle was on fire.
I wouldn't bother but it does actually give the illusion of an extra inch.
Although my missus says 10" is enough and the extra inch is just showing off.
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Post by Tone on Jul 3, 2013 21:53:40 GMT 1
I've got a Genuine Yamaha workshop manual for a 1988 DT125R 3BN model and it say's 55Nm or 40 ft.lb for the balancer drive gear nut.
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Post by midlifecrisisrd on Jul 4, 2013 8:35:32 GMT 1
Thanks guys for the answers ( including the smooth ball advice )
It's a 1985 DT 125 LC mk2 which should be the same as a Mk3 RD. Unfortunately the all have different balance shafts but at least I know 47 is way too much. It has a locating tab on it any way so will give it 30 as thread is very fine and would imagine there is a good tolerance before they strip showing it is not any where near 47.
Found another shaft on the bay so at least that is something
Steve
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Post by steeley on Jul 4, 2013 16:08:41 GMT 1
steve ,also you could put some thread lock on the thread .
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Post by midlifecrisisrd on Jul 4, 2013 16:26:46 GMT 1
steve ,also you could put some thread lock on the thread . Will do Steve |
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Post by LC_BOTT on Jul 4, 2013 16:27:52 GMT 1
Thought the idea of a fine thread is to take more 'ooomph' as there's more surface area for the threads to pull against? or am I wrong, hence all high loading bolts are like this, crank ends, caliper bolts, sprockets etc etc
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Post by midlifecrisisrd on Jul 4, 2013 16:41:28 GMT 1
Thought the idea of a fine thread is to take more 'ooomph' as there's more surface area for the threads to pull against? or am I wrong, hence all high loading bolts are like this, crank ends, caliper bolts, sprockets etc etc It gives a higher load for lower torque so gives higher compressive strength but unfortunately the threads are finer so easy to damage. Think it is space that is the issue as a heavier thread for the strength required would not fit behind the clutch drum. Steve |
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Post by bare on Jul 4, 2013 17:55:20 GMT 1
Odd.. If oem TQ is 40 lbs, it's unlikely that an 'extra' 7 lbs could strip it out.
Possibly your TQ wrench reading is iffy? or the shaft was knackered to begin with or even cross threaded? ?
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Post by midlifecrisisrd on Jul 4, 2013 18:17:39 GMT 1
Odd.. If oem TQ is 40 lbs, it's unlikely that an 'extra' 7 lbs could strip it out. Possibly your TQ wrench reading is iffy? or the shaft was knackered to begin with or even cross threaded? ? Don't think the correct reading for it is 40, as you say, an extra 7 should not do it. Motor had never been opened so knackered not an option and in hindsight it was not that difficult to undo. The later models had a different balancer which I take it the 40 ft lbs comes from. The primary and clutch centre bolts quote the same torque but are a lot heavier. Steve |
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Post by museumman on Jul 5, 2013 0:24:08 GMT 1
Shame, as I can give away some 1GU balance shafts, I take it yours is 34X molded ? I will get the 10W torque settings from the Yamaha manual just for comparison.
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Post by LC_BOTT on Jul 5, 2013 8:08:18 GMT 1
I've got an early yamaha manual, and it's 40lb for the balance shaft 'driven gear' and the clutch locknut, and 47lb for the kickstart.
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Post by midlifecrisisrd on Jul 5, 2013 8:25:02 GMT 1
Shame, as I can give away some 1GU balance shafts, I take it yours is 34X molded ? I will get the 10W torque settings from the Yamaha manual just for comparison. Yes mine is a 34x one. Yamaha torque setting would be good, thanks. Steve |
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Post by midlifecrisisrd on Jul 5, 2013 8:26:07 GMT 1
I've got an early yamaha manual, and it's 40lb for the balance shaft 'driven gear' and the clutch locknut, and 47lb for the kickstart. Cheers for that. Steve |
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Post by museumman on Jul 8, 2013 17:43:01 GMT 1
My May 82 10W Yamaha service book shows 47 ft-lb twice so doubt its a mistake, once in the diagram and then in the specifications chapter. This is the same torque as the primary drive, clutch boss and kick nuts.
Just for comparison
Rear wheel - 61 ft-lb
Front wheel 54 ft-lb
Footrest - 48 ft-lb
Exhaust rear 47 ft-lb
Flywheel 36 ft-lb
Cylinder head 15 ft-lb
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Post by kevsypvs on Jul 8, 2013 18:17:37 GMT 1
id borrow another torque wrench mate just to see if ures is faulty i had mine feck up a few years ago and it did the same stripped the threads , bastid thing
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