Kagama Centre Diff leak

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Nelson.81 said:
Been there got the T-shirt, damage won’t affect usage just looks bad. As for the leaking diff , thicker oil will resolve issue temporarily but not a fix I think why so many corally diffs leak & fail is because there is to much play on outdrive cups, stopping o’ring sealing properly & excessive movement resulting in gears getting chewed up , the cross pin which locks it in place inside the diff needs extra shims which will in turn seal your o’ring better & less chance diff failure imo. I need to remove my centre diff so I’ll maybe pull it apart post pics later when do.

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Add a couple of m6x12x0.1mm shims behind pin will help seal o’ring better & eliminate bit of the drive cup wobble. I add 0.2mm of shims think I tried 0.3mm but felt to tight.

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Nelson.81 said:
Add a couple of m6x12x0.1mm shims behind pin will help seal o’ring better & eliminate bit of the drive cup wobble. I add 0.2mm of shims think I tried 0.3mm but felt to tight.

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Spot on 😀 , I was servicing the rear diff last night and the drive cup wobble is quite bad on one side so was thinking what shims shall I get and now i know. Thanks for that.
 
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If you notice, only one o-ring per output seals the diff. The diff outputs themselves run through bushes and are not ballraced.

It's the same for top level racing diffs

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As the bushes that the outputs run through - on the centre diff, that's the steel spur and the diff case itself - as they wear, they are going to develop slop and then leak. A small amount of leakage is inevitable, due to the design.

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The design is basically the same for all our 1/8th diffs. I often wondered whether the diff outputs would be better off if they were supported on dual, rubber sealed, hi-speed bearings.

The only diff I see with a better way of sealing is the significantly larger Baja 5B diff

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You'll note the output is passing through its own bearing, o-ring and bush! They definitely seal up well.

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But they are bigger and heavier though.
 
Partydaz said:
Spot on 😀 , I was servicing the rear diff last night and the drive cup wobble is quite bad on one side so was thinking what shims shall I get and now i know. Thanks for that.
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It won’t eliminate the diff wobble but it will help reduce it , main reason I added shims was to stop leaking, my diffs leaked like a sieve I tried changing o’rings numerous times before added shims seems to be doing the job.
 
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