Author Topic: Gearbox  (Read 5961 times)

Offline Seabeowner

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Re: Gearbox
« Reply #15 on: March 29, 2018, 10:16:08 AM »
I posted about the 500 central selector fork just recently as noticed one had come up....and someone snapped it up before me......
Then found three more in the States at reasonable price but was going to buy two and then sell one on to cover the carriage....then damn me they got withdrawn...
So seeing so many common parts, will go for the 350 box.
Phil
1971  CB500K0  Candy Jade Green or Candy Gold
1973  CB500K1  Candy Ruby Red
1975  CB550F1   Shiny Orange
1978  CB550K     Excel Black

Offline cb550k-aaron

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Re: Gearbox
« Reply #16 on: April 02, 2018, 10:14:55 PM »
Drained the oil and took the sump off today. As you guys thought gears have been chewed :(

Not 100% sure which ones yet but engine is out and gonna split it tomorrow.

The Selector forks how can I tell of they are done? Can I post pictures tomorrow for you chaps to look at?

Offline Bryanj

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Re: Gearbox
« Reply #17 on: April 03, 2018, 07:26:35 AM »
Its normally blatantly obvious but post pictures anyway. Keep the shafts complete and refer to a parts book for what you need as the dogs that engage to get say 3rd are not on 3rd gear

Offline cb550k-aaron

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Re: Gearbox
« Reply #18 on: April 03, 2018, 10:49:13 AM »
Has anyone got a good clear picture of the clutch side of things? Ie the gear change mech etc?

Offline Trigger

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Re: Gearbox
« Reply #19 on: April 03, 2018, 11:25:42 AM »
I am getting confused by this thread, the 500 and 550 are different gear boxes. lucky that I am building a 550 today. Hope the pics help. [ Guests cannot view attachments ]

Offline cb550k-aaron

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Re: Gearbox
« Reply #20 on: April 03, 2018, 11:34:46 AM »
I am getting confused by this thread, the 500 and 550 are different gear boxes. lucky that I am building a 550 today. Hope the pics help. (Attachment Link)

Trigger! This is perfect many many thanks. It's a 550 I have. Cheers

Offline Trigger

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Re: Gearbox
« Reply #21 on: April 03, 2018, 11:45:29 AM »
Look for wear on the middle dog. The one in the pic is fecked  ;)


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Offline hairygit

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Re: Gearbox
« Reply #22 on: April 03, 2018, 11:54:40 AM »
Hey Trig, what's the red stuff on the second gear from the left on the output shaft in the first pic? Also traces of it around a couple of the main bearings?
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Offline Trigger

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Re: Gearbox
« Reply #23 on: April 03, 2018, 11:58:05 AM »
Hey Trig, what's the red stuff on the second gear from the left on the output shaft in the first pic? Also traces of it around a couple of the main bearings?

That would be a dollop of bearing guard mate.
« Last Edit: April 03, 2018, 12:00:46 PM by Trigger »

Offline cb550k-aaron

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Re: Gearbox
« Reply #24 on: April 03, 2018, 04:26:01 PM »
Okay fellas, I split the casings and took a look.

Here's a link to pictures
https://photos.app.goo.gl/xUKcmLBYLNYGFGEs2

Can you fellas have a look at the forks etc and let me know what you's think?

Also, the gear selector shaft which the gear lever connects too. Should there be any play horizontally? Mine moves around 5-10mm left and right

Offline Trigger

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Re: Gearbox
« Reply #25 on: April 03, 2018, 06:35:46 PM »
Looks like its been to the dentist  ;D
The damage is not caused by wear, it has been knocked down the gears at high speed to do that sort of carnage  ;)
A little worried that the roller bearing housing pins look flush in the journals.

Offline cb550k-aaron

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Re: Gearbox
« Reply #26 on: April 03, 2018, 06:38:59 PM »
It crunched when I was out last I was changing from 2-3rd, lest year it was slipping out of the gears but it never ever crunched on me

Offline cb550k-aaron

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Re: Gearbox
« Reply #27 on: April 03, 2018, 07:56:27 PM »
Looks like its been to the dentist  ;D
The damage is not caused by wear, it has been knocked down the gears at high speed to do that sort of carnage  ;)
A little worried that the roller bearing housing pins look flush in the journals.

I did notice that and some repairs to the casing too but seems to be well done. Would that be affecting anything internally? Do u think the selectors look ok etc?

Offline Laverda Dave

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Re: Gearbox
« Reply #28 on: April 03, 2018, 08:30:35 PM »
They look pretty bad, it takes real force to inflict that level of damage and probably over a period of time.
If the cases show signs of damage and subsequent repair I would seriously consider taking the whole engine apart just for piece of mind.
Might be worth considering trying to source another engine if only for spare parts (or use yours as the donor).
Good luck with the rebuild and hope you get the parts you need to get back on the road.
1976 Honda 400/4
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1978 Moto Morini 350 Sport
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1982 Laverda 120 Jota

Offline hairygit

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Re: Gearbox
« Reply #29 on: April 03, 2018, 08:35:52 PM »
You're very lucky that some of the debris from that didn't jam between the gears and lock the back wheel while you were riding it, the consequences if it did would be terrifying!

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