BigJimnyMeet (North) 2024 (12 Jan 2024)
14th July 2024
Parkwood Nr. Leeds
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R72 Gearbox Output Shaft Bearing Removal
- ZukracerV6
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I am well underway on rebuilding the gearbox but I have one question and want to clarify the Bigjimny wiki article on the rebuild. I have replaced all the bearings but the ones on the output shaft.
The screen print from the wiki page shows the shaft and bearing in question. If I have it right the top bearing (already removed in picture), gear and bottom bearing all come of the top of the shaft one after another?
Just want to double check as its not very obvious looking at the shaft.
Thanks Sam
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- OlaGB
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- ZukracerV6
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All of the bearings have now been replaced and the gearbox is now being put back together. Rebuilding the box was far easier than taking the engine/gearbox out! All this because of one knackered bearing.
Will post some photos on my build thread.
Sam
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- Max Headroom
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Does anyone know why the R72 box was prone to these bearings breaking up?
And does rebuilding with new and presumably different bearings necessarily mean that the bearings wont fail again?
Again, not meaning to hijack Zukracer's thread, but I thought that while on the subject it might be worth asking...
IF IT AINT BROKE, KEEP FIXING IT UNTIL IT IS
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- OlaGB
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The new bearings where all sealed, except for one..
Not sure if thats a good thing either, but the bearing kit seller sure ment it was better than stock.
If the new bearings lasts another 90k km, im good for 8-10 years or so.. Ive never owned a car for more than 4.
Max Headroom wrote: Sorry to jump in on this thread but...
Does anyone know why the R72 box was prone to these bearings breaking up?
And does rebuilding with new and presumably different bearings necessarily mean that the bearings wont fail again?
Again, not meaning to hijack Zukracer's thread, but I thought that while on the subject it might be worth asking...
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Max Headroom wrote: Sorry to jump in on this thread but...
Does anyone know why the R72 box was prone to these bearings breaking up?
And does rebuilding with new and presumably different bearings necessarily mean that the bearings wont fail again?
Again, not meaning to hijack Zukracer's thread, but I thought that while on the subject it might be worth asking...
One reason is that more of the torque is being transfered in the gearbox in the R72 compared to older models with different gearing. More or less the difference in the torque and thus the load is the same as the difference in the gearing. This is also the reason why the 2005 and more recent jimnys do not have the problem with the transfer box as the load on it is less. Of course there is also the wider chain in the transfer cases from 2005 and up.
If you cannot change the bearing size to wider or bigger bearings there is not much you can do to make it any stronger.
Better lubrication, better cooling will help, using the correct oil viscosity as well. Higher revs will lower the torque, but higher revs could make it hotter and make lubrication worse.
Not sure how smart it is to change the bearings to closed ones though, but this has also been done to the SJ413/samurai gearbox on older Suzukis...
Norway 2005 Jimny M16A VVT, 235 BFG MT, 2" Trailmaster, ARB rear lck, 17%/87% high/low gears.
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I guess I'm still non the wiser about whether new bearings will fix the problem Keeping it topped up properly with fresh oil seems to be all one can do.
I had my g'box drained down and refilled (but not flushed) There were metal particles present, but I dont know how much or how big they were as unfortunately I wasn't shown. (In aviation, we have magnetic plugs on engines or g'boxes and any particles go off for spectral analysis to determine where in the component the metal is coming from which helps determine the remaining life and functionality of that component, and avoids future component failure while in use)
At the moment I have no perceptible bad noises coming from the g'box, but then the car is that damned loud (soft top Jimny) I cant hear much anyway!
My only worry is that I sometimes feel a bit of difficulty getting it into first or reverse gear; it just doesn't feel very positive; then when I lift my foot on the clutch I think "yep I didn't think that was fully engaged " but this may be a separate issue
Is the g'box plug magnetic? if not, I will attach a very strong earth-magnet to it to keep any metallic debris in one place
IF IT AINT BROKE, KEEP FIXING IT UNTIL IT IS
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Also the problem does not seem to be present in the more recent Jimnys (I believe Suzuki fixed the problem around 2008/9?), even though they are still using the same gearbox.
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- ZukracerV6
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J999 MNY, ULYSSES M18 VVT with ITB's Dyno tested at 130hp
Pickup/tipper, R7me gearbox & 6.4 Rocklobster, 31" Toyo MT, 2x ARB air locker 3.9 diffs in braced axles, 6" total lift, Floating rear conversion, Raptor painted, CB, Recaro's, Caged, etc, etc...
www.youtube.com/user/riclemus
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My Jimny knowledge is ever being increased!
Although debris was found in my g'box and its making no nasty noises (that I can tell) , at least not yet at any rate, what would be the best thing to do bearing in mind that this is my daily drive to work...
Should I hold tight and hope that no bad noises start and if they do, deal with it then?
Or should I find a convenient moment to get the g'box stripped down and the offending bearings replaced before they fail? I am assuming that they are going to fail at some point; unfortunately I dont have much history with this car other than service stamps in the book mostly from some Ford dealer.
IF IT AINT BROKE, KEEP FIXING IT UNTIL IT IS
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Redline MTL oil is commonly used to try and make shifting easier. Its normal to sometimes need a second go on the clutch pedal to get going. The clutch cable could be worn/out of adjustment, worth checking maybe?. its easy to adjust. plastic cover on the side of the gearbox with a plastic nut on the outside where it goes in. cover just pulls off.
J999 MNY, ULYSSES M18 VVT with ITB's Dyno tested at 130hp
Pickup/tipper, R7me gearbox & 6.4 Rocklobster, 31" Toyo MT, 2x ARB air locker 3.9 diffs in braced axles, 6" total lift, Floating rear conversion, Raptor painted, CB, Recaro's, Caged, etc, etc...
www.youtube.com/user/riclemus
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