Gearbox / transmission oil, layshaft bearing, bush failure

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Re: Gearbox / transmission oil, layshaft bearing, bush failu

I've heard of and had cog teeth break under high loads and shifter dog faces wearing down but can't remember worn gear teeth mentioned yet time after time the bushes are trashed especially first and the sleeve gear set. My experience backed up by others now is that bushes don't get Any lube when in lower gears over idle rpm so my protocol to race around and extend tranny life is run thin easy to seep in/out ATF and shift out of lower gears as soon as practical. For my factory Trixie never gonna race around on I use what ever at hand in regular manual gear oil or ATF. I feel double pangs of guilt going across THE Gravel too timidly to spare most the bike jarring and lower gear bushes wearing out, again. Along with spare clutch seating clips and speedo drives one should keep spare 1st gear bushes on hand and stick a 3rd worn spare in middle of sleeve gear stack.

Not good news the race fell out at 180'F as easy for hwy speed summer ride to reach that in bearing friction area, so start a new post on how to do the Comstock's JBWeld fix w/o also fixing up the rollers.
 
Re: Gearbox / transmission oil, layshaft bearing, bush failu

quick somebody post the norton transformer vid
 
Re: Gearbox / transmission oil, layshaft bearing, bush failu

I put GL-5 gear lube in my gearbox and within a matter of days I got a flat tire!

Stuff's no damned good!
 
Re: Gearbox / transmission oil, layshaft bearing, bush failu

re; "I recently aquired the bike, I have no idea what they used for gear oil, it had the pungent stank that reminded me of old gear oil. It was fairly transluscent, quite heavy bodied. The bike had sat quite a while."

Sounds like somebody before you, Neglected to change the oil.
This will give you odd information as regards to the oil’s age and wear on gearbox parts, and cannot be relied on to assess any of the transmission damage caused.
 
Re: Gearbox / transmission oil, layshaft bearing, bush failu

BrianK said:
I put GL-5 gear lube in my gearbox and within a matter of days I got a flat tire!

Stuff's no damned good!
Click to expand...

haha good one! :mrgreen:
 
Re: Gearbox / transmission oil, layshaft bearing, bush failu

Addictive as a losing gambling habit, just ask the Norton dealerships.
 
Re: Gearbox / transmission oil, layshaft bearing, bush failu

ludwig said:
303 fmj said:
.. Seems to work fine--for me--and it is changed at least once per year regardless of miles----. So many different types of oils --I think it's probably best to not let it go for long periods of time before changing.
Click to expand...

How often do you change the gearbox oil of your car ?
Probably never .

I use this oil :
http://www.castrolmoto.com/en/products/ ... _synth.php

Certainly not pretending that it is the best .
I haven't changed it for the last 5 years , or 40000 kms .
(come to think of it ..didn't even check the level ).
Am I crazy ?
If you want to do something nice to your gearbox , install a belt drive ..
Click to expand...


I have a GMC truck----auto trans not manual-----so gets changed every 24000 miles.
Previous cars and trucks which were manual trans got changed whenever i thought it was needed. I didn't have to worry about my life in the balance if transmission failure occured . When on the bikes it's another matter----having worked at dealerships I know that a lot of riders neglect the maintenance which then leads to many failures which then they blame the manufacturer for poorly designed machines. A good PM schedule will catch many defects before they become major issues. That's why pilots perform a preflight check of their aircraft before takeoff.
 
Re: Gearbox / transmission oil, layshaft bearing, bush failu

ludwig said:
303 fmj said:
.. I have a GMC truck----auto trans not manual-----so gets changed every 24000 miles.
Previous cars and trucks which were manual trans got changed whenever i thought it was needed..
Click to expand...

Somebody should urgently warn Daimer Benz , Volkswagen , BMW ... that they got it all wrong ! .
With millions of cars under warranty , and filling their gearboxes ( manual and auto ) for life ..
Click to expand...


I can't wait then till BMW builds a 4-wheel drive 3/4 ton pickup truck so I can save some money on gear oil.
 
Re: Gearbox / transmission oil, layshaft bearing, bush failu

ludwig said:
303 fmj said:
.. I have a GMC truck----auto trans not manual-----so gets changed every 24000 miles.
Previous cars and trucks which were manual trans got changed whenever i thought it was needed..
Click to expand...

Somebody should urgently warn Daimer Benz , Volkswagen , BMW ... that they got it all wrong ! .
With millions of cars under warranty , and filling their gearboxes ( manual and auto ) for life ..
Click to expand...


I can't wait then till BMW builds a 4-wheel drive 3/4 ton pickup truck so I can save some money on gear oil.
 
Re: Gearbox / transmission oil, layshaft bearing, bush failu

In the brighter photo, what is the artifact located around half 12 and between the case bores? Is that the beginning of a crack?
All the best.
 
Re: Gearbox / transmission oil, layshaft bearing, bush failu

ludwig said:
303 fmj said:
.. I can't wait then till BMW builds a 4-wheel drive 3/4 ton pickup truck so I can save some money on gear oil.
Click to expand...
Maybe with all those vehicles , you already poured a BMW'S worth of perfectly good oil down the drain ? ..
Click to expand...


Not down the drain---goes into my Ford diesel tractor which then leaks on the ground during the spring plowing.
 
Re: Gearbox / transmission oil, layshaft bearing, bush failu

I was using 75w90 synthetic gear oil API GL-5 in my gearbox until I read this thread.

I just bought MOTUL "Motorcycle geabox oil SAE 10w30 API GL-4".

On the label it says " A unique lubricant for 2 stoke or 4 stroke vehicules with a separate gearbox and wet clutch. Reinforced with extreme-pressure, anti-wear, anti-corrosion and anti-foam additives. Contains calcium sulfonate..."

Does that seem ok for the Norton gearbox?
 
Re: Gearbox / transmission oil, layshaft bearing, bush failu

I just checked the bottle of the 80W-90 gearlube I've been using in my gearbox, it claims it meets GL-4 and GL-5 spec...Which, if reading some of the comments here, seems contradictory...If GL-5 spec is not good for yellow metals, but GL-4 is, how can both GL-4 and GL-5 specs be met with the same type of oil?
 
Re: Gearbox / transmission oil, layshaft bearing, bush failu

I think due to that not all transmissions which require a GL 5 rating have brass/bronze bushings---so wouldn't matter.
Back in the 60's--70's when these bikes were made---just any good quality gear lube was used--they didn't have all these fancy additives like today.
 
Re: Gearbox / transmission oil, layshaft bearing, bush failu

AntrimMan said:
In the brighter photo, what is the artifact located around half 12 and between the case bores? Is that the beginning of a crack?
All the best.
Click to expand...
It sure is... good eye!
 
Re: Gearbox / transmission oil, layshaft bearing, bush failu

Gearbox / transmission oil, layshaft bearing, bush failure


Gearbox / transmission oil, layshaft bearing, bush failure
 
Re: Gearbox / transmission oil, layshaft bearing, bush failu

concours said:
AntrimMan said:
In the brighter photo, what is the artifact located around half 12 and between the case bores? Is that the beginning of a crack?
All the best.
Click to expand...
It sure is... good eye!
Click to expand...
....ahhh so, is that the kiss of death for the case then?
---if I was a drinking man--- after a few raising of the wrists and some contemplation I might consider the end use and be tempted to pursue cleaning the living snot out of it and seal against lubricant migration or water ingress.
I suppose it's comes down to money and availability really.

For those in the know, how common is this sort of crack?
What is the usual remedy?
Is the case a bin job?
All the best.
 
Re: Gearbox / transmission oil, layshaft bearing, bush failu

AntrimMan said:
For those in the know, how common is this sort of crack?
What is the usual remedy?
Is the case a bin job?
Click to expand...

It is fairly common - but it doesn't appear to cause any problems and not a reason to change the case.
 
Re: Gearbox / transmission oil, layshaft bearing, bush failu

L.A.B. said:
AntrimMan said:
For those in the know, how common is this sort of crack?
What is the usual remedy?
Is the case a bin job?
Click to expand...

It is fairly common - but it doesn't appear to cause any problems and not a reason to change the case.
Click to expand...


PHEW! The "taint" is thin there, I figured it happened occasionally. Glad to hear that. :mrgreen:
 
Re: Gearbox / transmission oil, layshaft bearing, bush failu

concours said:
L.A.B. said:
AntrimMan said:
For those in the know, how common is this sort of crack?
What is the usual remedy?
Is the case a bin job?
Click to expand...

It is fairly common - but it doesn't appear to cause any problems and not a reason to change the case.
Click to expand...


PHEW! The "taint" is thin there, I figured it happened occasionally. Glad to hear that. :mrgreen:
Click to expand...
mr. concours: you are a sick bastid, " taint", and we could easily get along famously. How do you carry your six pack?
The angle of deflection in use would suggest the crack is no big deal, leaks aside and probably not much of a leaker anyways. Thank's LAB for the confirmation.
Given my druthers I would clean as previously mentioned, place a dollup of conformal coating on the crack and vacuum impregnate.
It is thin there.
All the best.
 
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