CARC leaking

I have a very small leak, coming from the CARC, rear part. Anything I should worry about or is easy to fix? It smells like transmission fluid.

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Your leak is in a different area than mine. I'm currently dealing with a CARC leak right now myself. I was hoping that it was leaking from around the rubber boot clamp. But, after lifting the boot and inspecting underneath and around the boot clamp, it was clean and dry. Its leaking from the split in the case at the rear. Its at Eurocycles of Tampa right now waiting on Guzzi to authorize the repair under warranty. Bike has less than 1000 miles on the OD.

Yeah, gaskets and rubber hoses aren't made from the better quality.

There is no gasket on the CARC, it's sealed with an small amount of Threebond or similar. Blue? What year is your bike? I'm assuming it's not the one in the picture as there aren't any brown motor/transmission 1200's.

First check the bolts holding the bevelbox to the swingarm are tight. If they are then either there is insufficient sealant between the face of the box and the swingarm, (Unlikely. They usually squeeze it on with what appears to be a garden hose!) or the pinion seal on the box or the gearbox output shaft seal are leaking. You won't know until you pull the box off the arm.

Pete

Mine is a 2014 model. Black CARC. The bolts are tight at 35Nm. I have 52000km on the clock and no issue so far with that CARC.

It looks like it's just sweating a bit. What's the worst that could happen if I keep riding for a few weeks longer with this?

The worst that will happen is you'll have a sweaty arse! Really, is it dripping? If not just check the oil and forget about it until you can get it fixed. If it is dripping? Then check the oil to see how much it has lost, make sure your brake pads are uncontaminated and ensure no oil has got on the tyre and fix it as soon as possible. If there is oil on the tyre or brake pads stop riding until it's fixed.

Pete

Ok, that's clear. After a few days, it has a smal drip on the brake line clamp so it's not that bad. But I'll get it fixed somewhere next week.
BTW, with this temperatures my arse is sweaty all day. 35degrees yesterday

Pete Roper wrote:

or the pinion seal on the box or the gearbox output shaft seal are leaking.

Pete,

Which seals are these on the drawings? It's not entirely clear to me.

Well the gearbox output shaft seal is bleeding obvious and IMHO unlikely to be the problem. The most likely one is the pinion seal that sits in a holder on the front of the reactive bridge.

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It lives in here.

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Pete

PS. Gearbox output shaft visible here under the tool on the left in the photo.

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No, you don't have to split the box to replace it. This one was being split to fix something else.

I took a closer look. Apparently the wet stuff comes from where the brake line is kept in place under the drive shaft. So, am I correct that's it's most likely the seal that comes from the gearbox (pinion?) ?

Is it the marked part on this drawing?

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No, it is most likely one of two things. If you're lucky it will simply be the fact that the gloop they put between the swingarm and the bevelbox isn't adequate and the pressure exerted by the clamping force between the two is insufficient to keep the oil in.

I f you're unlucky it will be the seal on the front of the reactive bridge seen as part #3 I think in the parts breakdown that is the last pic in this thread


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Pete

Ok, In that case I'll be unlucky because the leak isn't coming from the place I spotted in my first post.

Anyway, the inside of the swingarm should be dry, isn't it?

Pete, you're a hero having so much patience with me asking stupid questions!

BT, I had a similar drip a couple of years ago. It's not a big job to pull the bevel box off, and it will be immediately obvious what's leaking. You will likely have a pool of oil in the swing arm.

Here you can see the seal was wet with oil:


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Pooling in the swing arm:


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Thanks Pete.