V50 GEARBOX |
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jumbo12
Falcone Joined: 08 Aug 2021 Location: WEST MIDLANDS Status: Offline Points: 50 |
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Posted: 09 Aug 2021 at 13:36 |
Hi
New to this Guzzi site. I am restoring a 1980 MOTO GUZZI V50 11, at the moment I'm working on the engine and have the gearbox separated from the engine. Silly thing to do but I have unscrewed the eccentric bolt which I now find holds together 2 springs, going to take the gearbox end cover off to the reset these springs, the manual does not give any info as to the position of these springs but just says remember their position when removing, no good to me. Does anyone have a photo, sketch or info of how these springs should be fitted and the position of the eccentric bolt ? Thanks, |
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c13pep
Senior Member Joined: 31 Aug 2017 Location: Doncaster Status: Offline Points: 2110 |
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The gearbox will have to be dismantled from the bellhousing end leaving you with the following
You will be able to work out which is the centre position of the concentric shaft with the gearchange mechanism looking like this Moto Guzzi Shift return spring alignment - YouTube Make sure the felt washer is in good condition in the shaft housing CHRIS
Edited by c13pep - 09 Aug 2021 at 14:42 |
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you can`t have any fun in a straight line
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jumbo12
Falcone Joined: 08 Aug 2021 Location: WEST MIDLANDS Status: Offline Points: 50 |
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Hi Chris
Thanks for your reply, really appreciated. Not sure we talking about the same spring, I was hoping it was an easier job, the spring I am talking about is at the gearbox end where there is a small cover which has the clutch actuation arm attached, thought I could take off this cover and fit the spring which is still inside onto the eccentric bolt, does this make sense ? or is your photo is what I have to do ? Thanks, |
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Ken-Guzzibear
Moderator Group Joined: 13 May 2014 Location: Sileby Leics Status: Offline Points: 9454 |
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If unsure any gearbox issue me they go to Nigel at NBS can't be that far for you he is in Inglestree ... top bloke really knows his way around Guzzis and does not overcharge
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The Older i Get, The Better I Was
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c13pep
Senior Member Joined: 31 Aug 2017 Location: Doncaster Status: Offline Points: 2110 |
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Moto Guzzi gearbox - YouTube
This shows the concentric and the selector quadrant The concentric acts on the selector spring inside the gearbox and provides bias on either the upshift or downshift by pressing on either of the spring tines As the youtube vid suggests it`s a bit of a dark art but you must have been very unlucky to dislodge the selector spring my spare gearbox showing end cover close up with everything in place CHRIS
Edited by c13pep - 09 Aug 2021 at 20:31 |
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you can`t have any fun in a straight line
Monza Honda CB77 project |
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jumbo12
Falcone Joined: 08 Aug 2021 Location: WEST MIDLANDS Status: Offline Points: 50 |
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Hi Chris
Many thanks for your help. I understand now that the gearbox has to be stripped down from the bell end casing not just the end cover, spoken with Nigel , nice guy, £200 to strip down and refit the eccentric bolt !! costly mistake on my part. I am ok with engine not sure if to tackle myself. The spring itself is still in place but just not on the eccentric bolt, there seems to be an unknown about if the gears will still select without the bolt, apparently just makes it a bit smoother, might try it without first. Marc. |
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c13pep
Senior Member Joined: 31 Aug 2017 Location: Doncaster Status: Offline Points: 2110 |
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Without the concentric bolt the spring will `float` as the lip on the end of the bolt hooks around the spring tine to hold it up to the casing. I am stripping my spare box down so will take a close up of the adjuster in place from the inside, not that it will help you much. The box is straightforward to strip with the only difficulty being the removal of the 27mm nut on the input shaft that is visible when the engine and gearbox are split. This can be overcome by splitting the first cases with it still attached which will necessitate renewing the oil seal (less than £1) as it will damage it pulling the shaft through, but makes the nut easier to remove once the cases are split. There are no hidden springs etc. to leap out when dismantling the box, you are left with what is pictured in my first photo, `simples`
CHRIS
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you can`t have any fun in a straight line
Monza Honda CB77 project |
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jumbo12
Falcone Joined: 08 Aug 2021 Location: WEST MIDLANDS Status: Offline Points: 50 |
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Hi Chris
That would be great, any photos to give me confidence would help, I feel that I should do this repair properly, I was looking for an old box to buy and practice on but they are all too expensive. Marc |
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c13pep
Senior Member Joined: 31 Aug 2017 Location: Doncaster Status: Offline Points: 2110 |
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I have done a trial run this morning and your job can be done without disturbing the gear clusters or selector drum (2 hours at steady pace) however it is more than likely that two gearbox gaskets will be needed Gutsibits Moto Guzzi Spares & Accessories - The Shop - V35 V50 NTX 350 Monza Imola - Gearbox In descending order picture 1 is what greets you when engine and gearbox are split picture 2 shows bell housing case removed from box, as can be seen there is no need to remove the 27mm input shaft nut for your job picture 3 shows gearbox breather and spring loaded detent which can be removed for cleaning and especially to make sure the detent is free to move in the housing picture 4 shows the casing that has to be lifted off the clusters usually with a rubber mallet as there are dowels to separate. This case is held in place by the allen key bolt at the rear of the box, there are two different sizes picture 5 shows the detent in its housing when the final cases are split pictures 6 and seven show the offending spring and concentric, after and before it is fitted This last bit is where you can `wiggle` the spring tines onto the concentric bolt using a small screwdriver When the bolt is screwed in it pushes the spring away so that either one or both tines don`t `hook` over it, by using the small screwdriver it is possible to slide the spring back etc. When finished the bolt is usually exposed by about 10mm and it is advantageous to mark the outside of the bolt so that you can see where the concentric is at its highest (stops the guesswork when adjusting it) Set the bolt in its neutral position so that it can be adjusted when the bike is back together HAVE FUN CHRIS
Edited by c13pep - 12 Aug 2021 at 16:12 |
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you can`t have any fun in a straight line
Monza Honda CB77 project |
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jumbo12
Falcone Joined: 08 Aug 2021 Location: WEST MIDLANDS Status: Offline Points: 50 |
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Hi Chris
That's a fantastic help to me, very much appreciated. I feel much happier now to have ago. As I am new to the site will this info stay on for me to view at any time or do I have to save it some how ? I noticed in the manual it says to bolt to a stand to work on, do you advise some sort of holding for the gearbox or can you just handle whilst working, still a bit stressed in case some thing drops off while working on it. Cheers, Marc. |
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c13pep
Senior Member Joined: 31 Aug 2017 Location: Doncaster Status: Offline Points: 2110 |
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Gearbox is quite light compared to the engine and no nothing will pop out or drop out.
Working on a bench then a holding device is not needed as you will work from both ends, just make sure all the oil is drained, preferably while the box and engine are still on the centre stand. CHRIS
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you can`t have any fun in a straight line
Monza Honda CB77 project |
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jumbo12
Falcone Joined: 08 Aug 2021 Location: WEST MIDLANDS Status: Offline Points: 50 |
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Hi Chris
Sorry for the continual questions, have now got to the part where the main casting has to be removed, can only get about 3/4mm gap and then seems to be stuck, is it on the dowels ? do I just have to keep tapping with a mallet ? All the bolts are out. Cheers Marc |
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jumbo12
Falcone Joined: 08 Aug 2021 Location: WEST MIDLANDS Status: Offline Points: 50 |
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Hi Chris
Had another go but will not budge any further, should I have to take off the circlip showing on the one shaft ? Marc |
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jumbo12
Falcone Joined: 08 Aug 2021 Location: WEST MIDLANDS Status: Offline Points: 50 |
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Hi Chris
Really sorry about this, 2 hours on and still cannot get this casting off, seems to be sticking where the main drive shaft is, should I have removed anything else, or is it me ? Marc |
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jumbo12
Falcone Joined: 08 Aug 2021 Location: WEST MIDLANDS Status: Offline Points: 50 |
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Hi Chris
Just noticed in your picture 4 , I still have the 23 gear and nut on, should I have removed these ? Marc |
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