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2CViking
viking bastard
Joined: April 18th, 2009, 11:43 am
Posts: 2424
Location: Meneac, Bretagne France
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 Re: DO-LAH refurb ken wrote: On both gearboxes, the main shaft ( speedo drive) nuts had defeated the original method of locking and could almost be unscrewed by hand. Since that allows the main shaft to move forwards, I reckon that either this fault, or a 'floppy' bearing, is just as much to blame for an unwinding episode as the poor job Citroen did of peening the selector ring. Loctite 638 will make very sure those nuts don't work loose. < http://www.loctite401.com/template/ying ... 638-EN.PDF > ken.quote] Ken first I'm not looking for trouble but the loose nut is not caused by ''work loose'' The locking is preventing that. The reason for loose nut is plain wear and tear. Citroen did lock the nut with correct kg but over time the wear through the bearing and other bits on the top shaft will remove the tention.
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| March 4th, 2010, 10:45 pm |
 
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hjbharry
Firing on two.
Joined: May 1st, 2009, 11:36 pm
Posts: 856
Location: hertfordshire
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Re: DO-LAH refurb thanks ken  will i need any seals or gaskets to go with the bearing? or shall i take it apart and see what i need first before I make a shopping list and give Roy a ring.
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Low and Loud!
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| March 4th, 2010, 10:51 pm |
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ken
Agony Aunt - You have a car problem? Speak to Ken
Joined: March 6th, 2009, 1:40 am
Posts: 3675
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Re: DO-LAH refurb Viking, 50 to 60 ft.lbs is the specified torque on assembly, with the peening intended solely to prevent any slackening of the nuts, yet in 90% of the gearboxes which I have opened, both nuts were free enough that they could be moved to and fro with one finger. Also, it's only the inner races of the bearings on both main shaft and pinion shaft which are clamped by the nuts, so even if the ball bearings and the race surfaces which they run on were totally jiggered, that cannot alter the width of the inner races. However, if the nuts do slacken off, 'fretting' of the various items which should have been clamped tightly together will occur, which is why I've been using Loctite on the nuts for the last 25 years...  ken 2CViking wrote: Ken first I'm not looking for trouble but the loose nut is not caused by ''work loose'' The locking is preventing that. The reason for loose nut is plain wear and tear. Citroen did lock the nut with correct kg but over time the wear through the bearing and other bits on the top shaft will remove the tention.
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Last edited by ken on March 5th, 2010, 12:27 am, edited 1 time in total.
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| March 5th, 2010, 12:21 am |
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ken
Agony Aunt - You have a car problem? Speak to Ken
Joined: March 6th, 2009, 1:40 am
Posts: 3675
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Re: DO-LAH refurb Harry, no gaskets needed when removing rear cover or top cover, only gasket goo. I've usually got at least 30 of the 6304NR bearings in stock, if you need one... ken. hjbharry wrote: thanks ken will i need any seals or gaskets to go with the bearing? or shall i take it apart and see what i need first before I make a shopping list and give Roy a ring.
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| March 5th, 2010, 12:24 am |
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Russell
Firing on two.
Joined: November 29th, 2008, 10:05 pm
Posts: 9259
Location: West Sussex, U.K.
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Re: DO-LAH refurb ..and don't drop the ball.
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samfieldhouse wrote: What I like about I2F is that there is no pretence of democracy.
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| March 5th, 2010, 12:25 am |
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ken
Agony Aunt - You have a car problem? Speak to Ken
Joined: March 6th, 2009, 1:40 am
Posts: 3675
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Re: DO-LAH refurb or the spring?  Russell wrote: ..and don't drop the ball.
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| March 5th, 2010, 12:28 am |
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Russell
Firing on two.
Joined: November 29th, 2008, 10:05 pm
Posts: 9259
Location: West Sussex, U.K.
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Re: DO-LAH refurb I'm sure it was a wee ball doobrey i lost in the bottom of it before? But yeah, the spring under the top, not lost that yet...
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samfieldhouse wrote: What I like about I2F is that there is no pretence of democracy.
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| March 5th, 2010, 12:29 am |
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2CViking
viking bastard
Joined: April 18th, 2009, 11:43 am
Posts: 2424
Location: Meneac, Bretagne France
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Re: DO-LAH refurb ken wrote: Viking, 50 to 60 ft.lbs is the specified torque on assembly, with the peening intended solely to prevent any slackening of the nuts, yet in 90% of the gearboxes which I have opened, both nuts were free enough that they could be moved to and fro with one finger. Also, it's only the inner races of the bearings on both main shaft and pinion shaft which are clamped by the nuts, so even if the ball bearings and the race surfaces which they run on were totally jiggered, that cannot alter the width of the inner races. However, if the nuts do slacken off, 'fretting' of the various items which should have been clamped tightly together will occur, which is why I've been using Loctite on the nuts for the last 25 years... ken 2CViking wrote: Ken first I'm not looking for trouble but the loose nut is not caused by ''work loose'' The locking is preventing that. The reason for loose nut is plain wear and tear. Citroen did lock the nut with correct kg but over time the wear through the bearing and other bits on the top shaft will remove the tention. Yes I know that most nuts are loose and you can move them with your finger but I have only seen 1 nut in 10 years coming off the locking. The top shaft is floating and not fixed in one position. When the rear cover is pressing on the outer race the shaft when worn can move foreward and backward. When the inner race and the balls become worn the tention is reduce and the nut becomes loose. How many times have you seen the rear nut turned beyond the locking groove? Not a common thing, right.
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| March 5th, 2010, 12:39 am |
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Russell
Firing on two.
Joined: November 29th, 2008, 10:05 pm
Posts: 9259
Location: West Sussex, U.K.
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Re: DO-LAH refurb The unwinding is a very common thing!
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samfieldhouse wrote: What I like about I2F is that there is no pretence of democracy.
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| March 5th, 2010, 12:53 am |
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ken
Agony Aunt - You have a car problem? Speak to Ken
Joined: March 6th, 2009, 1:40 am
Posts: 3675
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Re: DO-LAH refurb Not on early gearboxes, which used castellated nuts and cotter pins to lock those nuts securely...  Russell wrote: The unwinding is a very common thing!
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| March 5th, 2010, 2:23 am |
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