Gearbox bearings - MVAgusta.net
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post #1 of 20 (permalink) Old 01-27-2014, 03:18 AM Thread Starter
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Question Gearbox bearings

I guess this one is aimed at Donsy and Noel as I'm not sure who else has had a gearbox in pieces....

The replacement I bought from Time Machine Bikes was no good as it would appear the R312 has larger shafts than the 1000S & R. Lesson learned..

I'm hoping that replacing all of the needle roller bearings (8000A0370 ) in the main and counter shaft will solve the wining gearbox. (2 on the main shaft and 4 on the counter shaft)

If the 2 main bearings in the case look OK (8000A1086 & 8000A2318) feel OK should these be replaced also? Should I replace the 2 seals (800064296 & 800089410) while I have it in pieces?

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J
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post #2 of 20 (permalink) Old 01-27-2014, 04:25 AM
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No harm in replacing them Jeremy, I didn't replace mine, but next time I will for sure. Also make sure you don't damage the seal on the gear selector shaft and clutch push rod shaft, they are the first to go.

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post #3 of 20 (permalink) Old 01-27-2014, 04:46 AM Thread Starter
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Thanks Dons.
I will definately replace the 3 seals. The 2 larger bearings are quite expensive..

How do you deal with the 2 circlips on the main shaft that had been ground down to fit inside the gears? What a pain they were to remove as there is not much for the circlip pliers to hold on to...
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post #4 of 20 (permalink) Old 01-27-2014, 07:14 AM
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I'd be surprised if the bearing's caused the noise, but no expert, mine stopped sounding like a Boeing after I rebuilt, but I didn't replace the bearing's. Those circlip's are crazy, you should see them on the race box. :'(

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post #5 of 20 (permalink) Old 01-27-2014, 08:42 AM
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Whining sound is likely coming from tight gear tooth lash, not bearings. One set of gears have teeth slightly tight (not a problem except noise). Loose gear tooth lash usually makes rattle noise.
Transmission circlips are critical parts. Make sure the sharp edge is facing the direction of thrust. Replace if at all tweaked during removal.

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post #6 of 20 (permalink) Old 01-27-2014, 06:23 PM Thread Starter
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Quote:
Originally Posted by Donsy View Post
I'd be surprised if the bearing's caused the noise, but no expert, mine stopped sounding like a Boeing after I rebuilt, but I didn't replace the bearing's. Those circlip's are crazy, you should see them on the race box. :'(
Do you know the cause if it wasn't the bearings?
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post #7 of 20 (permalink) Old 01-29-2014, 10:59 PM
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Wink

Ed;
tight gears would eat bearings, never seen any tight gears.....I used to build GM Muncies, T-10s and Honda car trannys

bad bearings whine......bad ball bearings usually tear the cage up and get ugly, throwing cage pieces into the gears

that's why you put the special slotted shim behind the input shaft bearing on GM Muncies and T-10s.....to keep trash out of the gears

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post #8 of 20 (permalink) Old 01-30-2014, 07:19 AM
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Not tight like root to tip fit, tight like face to face fit...lash. Ever hear a rear diff with gears not shimmed right? I've seen it in transmissions too, manufacturing tolerance stack. Rare, but it happens.

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post #9 of 20 (permalink) Old 01-30-2014, 11:50 PM
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Quote:
Originally Posted by esq'z me View Post
Not tight like root to tip fit, tight like face to face fit...lash. Ever hear a rear diff with gears not shimmed right? I've seen it in transmissions too, manufacturing tolerance stack. Rare, but it happens.
the sides of gears where they bear on shims is smooth....no way to make noise.....thats side play not lash

spider, side gears and ring and pinions are whole different can of worms.....its depth of engagement of the gears

lash or backlash is the play between two meshing sets of gear teeth

Kawasakis and new BMWs have a spring loaded sheet metal gear off set to the main gear on clutch baskets.....to cut down on noise, maybe other bikes do too

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Last edited by theknurl; 01-31-2014 at 12:01 AM.
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post #10 of 20 (permalink) Old 01-31-2014, 05:25 AM
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Yep, I know why the diff gears whine when not shimmed correctly....that's just what I was talking about.mdepth of engagement changes lash.
Lots of bikes with scissor gears out there. The TL1000 Suzuki, among others, has them on the cam gears. Primary gears are quite common. The new Indian Thunderstroke has scissor gears.

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