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 Input shaft bearing replacement 
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Haggis Muncher
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Joined: September 13th, 2012, 7:38 pm
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Location: Denny, Scotland
Post Re: Input shaft bearing replacement
That is one of the many things I like about this forum - everyone is entitled to their own opinion and its great to hear differing points of view :)


February 4th, 2015, 8:42 pm
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Haggis Muncher
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Joined: September 13th, 2012, 7:38 pm
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Location: Denny, Scotland
Post Re: Input shaft bearing replacement
So today i liberated an old clutch from an engine that has been sitting in the lock-up for as long as i can remember. I'll use this along with ken's instructions to (hopefully) get the input shaft bearing retaining nut off so I can finally do the job i set out to do 6 pages of replies ago :lol:

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While getting the clutch I noticed a bearing/bush that I've heard about -I think it is called the pilot shaft bearing? The bronze one in the middle of the rear of the crank. I've seen it mentioned many places while looking up about gearboxes that you should replace this if you have things stripped enough to get to it, and I plan to change my clutch when I install this gearbox, so it will be easy to get to. Do I really need to change it? If so, whats the procedure? I couldn't find mention of it in haynes and having a poke at it on this engine failed to reveal a way to remove it...

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February 4th, 2015, 9:00 pm
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Firing on two.
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Joined: June 19th, 2010, 8:40 pm
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Location: Kingswood, S.Glos.
Post Re: Input shaft bearing replacement
Whack in a load of grease. Then use an input shaft with a good thump and hydraulic pressure should pop it up hopefully :?

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February 4th, 2015, 9:30 pm
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Firing on two.

Joined: April 22nd, 2009, 11:06 pm
Posts: 3684
Location: Ecosse
Post Re: Input shaft bearing replacement
yup replace it your bearing place will do an oiltite of the right size for a couple of ££ also get the oil seal its the same as the one used on the Honda red top pocket engines found powering lawnmowers gennys and just about everything

a 12mm bolt or dowel will do the hydraulic hammer thing as long as its a tight fit in the bearing

remember the imput shaft nut is a left handed one - i just put the gearbox end in the vice......its a big vice and grips really well

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February 4th, 2015, 9:42 pm
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Haggis Muncher
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Joined: September 13th, 2012, 7:38 pm
Posts: 571
Location: Denny, Scotland
Post Re: Input shaft bearing replacement
Sean wrote:
i just put the gearbox end in the vice......its a big vice and grips really well


You implying that my £10 Aldi workmate rip-off won't be up to the task? :lol: :lol: :lol:


February 4th, 2015, 11:05 pm
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Agony Aunt - You have a car problem? Speak to Ken

Joined: March 6th, 2009, 1:40 am
Posts: 3675
Post Re: Input shaft bearing replacement
jasu,
sorry, should have mentioned that I noticed a long time ago that the rear mainshaft bearing always seemed to be the first to wear out on 602 gearboxes.
That's hardly surprising since the older gearboxes which had to deal with lower power outputs had a double-row ball bearing in that location,whereas the later gearboxes have a single-row bearing...

I also realised that Citroen's original flanged bearing could be replaced with a readily available ( & low cost) 6304NR bearing and must have fitted well over a hundred of these bearings so far.
As for the shielded or sealed bearing retaining oil in the bearing, every time I've stripped a gearbox for repair, even one which has been standing for years, I've had to wash the bearings in petrol to remove a layer of oil before they can be examined for wear.
Even if the bearing has a pressed metal cage retaining the individual balls, rather than a nylon cage, capillary action seems to ensure that some oil is retained.

Anyhow, here's a tale about another motor vehicle manufacturer which has had much more serious problems with a ball bearing, albeit one inside the engine, where the problem stems from the use of a sealed bearing.
Although the seals were intended to keep oil out of the IMS tube and keep the permanent lubricant in the bearing, neither happens.

http://www.ebay.co.uk/itm/PORSCHE-911-9 ... 0822020381

Costs a bit more to fix than a 2CV gearbox, though... ;)



jasu wrote:
Again, there is opinions, and is that what is asked for? Also, it is nice to even try to rationalize the opinion, no only say "do right that" or "don't do it", please.

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Last edited by ken on February 5th, 2015, 1:43 am, edited 1 time in total.



February 5th, 2015, 12:07 am
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Haggis Muncher
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Joined: September 13th, 2012, 7:38 pm
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Location: Denny, Scotland
Post Re: Input shaft bearing replacement
ken wrote:
I also realised that Citroen's original flanged bearing could be replaced with a readily available ( & low cost) 6204NR bearing and must have fitted well over a hundred of these bearings so far.


*cough* 6304NR *cough*

Look at me, pretending to know what I'm talking about... :lol: :lol:


February 5th, 2015, 1:26 am
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Agony Aunt - You have a car problem? Speak to Ken

Joined: March 6th, 2009, 1:40 am
Posts: 3675
Post Re: Input shaft bearing replacement
Fixed now, thanks... ;)
Must have been in shock from reading all that Porsche guff, which uses a 6204 bearing



smyth602 wrote:
ken wrote:
I also realised that Citroen's original flanged bearing could be replaced with a readily available ( & low cost) 6204NR bearing and must have fitted well over a hundred of these bearings so far.


*cough* 6304NR *cough*

Look at me, pretending to know what I'm talking about... :lol: :lol:

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February 5th, 2015, 1:45 am
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Haggis Muncher
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Joined: September 13th, 2012, 7:38 pm
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Location: Denny, Scotland
Post Re: Input shaft bearing replacement
So today I relented after trying to clamp the input shaft a hundred different ways and failing, even with ken's clutch idea and paid a visit to the guy that pressed the diff carrier bearings on for me, and in about two minutes flat he replaced the input shaft bearing and tightened up the nut to the correct torque again.

Oh, to have a workshop like his - every tool I've ever looked at and thought 'some day...', 2-post lift, parts cleaners big enough to take an engine and a mighty log burner with a huuuuge hotplate on top for the kettle! I think i might offer to sweep the floors in exchange for using some of the equipment...

So now that i have the bearings changed I guess its time to put things back together! Expect enough questions to make your eyeballs bleed...


February 5th, 2015, 10:26 pm
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Haggis Muncher
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Joined: September 13th, 2012, 7:38 pm
Posts: 571
Location: Denny, Scotland
Post Re: Input shaft bearing replacement
Just a quick message to say I've not abandoned this! I've been unemployed for the last few months after getting laid off in November, but now my savings have just about run out and no jobs are forthcoming in my field at this time of year so all projects have slowed to a crawl :(

I've started doing a dry-run of reassembling the workings so that i can get my head around how all of it works and i noticed that the needle cage bearing that sits between the input and mainshaft is quite a loose fit on the mainshaft. i'm not sure if it is worn or just a slack fit normally... any opinions?

http://youtu.be/USfQEVsqdog


February 16th, 2015, 9:39 pm
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