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Author Topic: Replacing diff inter shat bearings/seals  (Read 73 times)
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bobk
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« on: July 16, 2024, 09:34:47 PM »

Hi. I'm new to the Beta Spider, so need advice on curing the oil leak around the intermediate shaft.
How do I remove the shaft and bearings/seals with engine and transmission in situ. Do I have to remove the drive shafts. Can this be done by just undoing a suspension joint, rather than pulling the hubs (a nightmare I believe). Can somebody give me a step by step process.
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Nigel
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« Reply #1 on: July 16, 2024, 10:35:43 PM »

Hi Bob and welcome!

Assuming your leak is at the diff end of the intermediate shaft.....

Slacken first the hub nut on the ground, it's tight.
Then remove the 2 bolts connecting the hub to the shock. undo the 6 drive shaft bolts,
the drive shaft will then come out.
Then you can remove the intermediate shaft carrier bolts from the engine block, (jack up the engine slightly for this) and the
6 bolts from the diff flange. Then you'll need a castle nut socket ( I made my own tool for this) to remove the inner nut, the
flange then pulls out of the diff. An impact wrench is very handy here.
You can then remove the 4 bolted diff flange to give access to the seal. Be aware there may be
shims inside that need to go back in to preserve the diff pre-loading.

Hope this helps. Others may well offer more and better advice.
Nigel

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SanRemo78
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« Reply #2 on: July 17, 2024, 08:14:27 AM »

I think you may be able to do it without removing the driveshafts from the hubs.

If you put the car on axle stands and remove the front wheels you can get at the inner CV Joints to remove the 6 bolts each side. The driveshafts can then be covered with a bag to reduce the chance of dirt getting in and laid to one side. The intermediate shaft needs to be released from the engine mount (2 nuts/bolts) and the block (one nut) and then levered off a locating pin before it can be withdrawn. It may bring a mating collar with it from the diff end. Obviously you need to support the engine so this can come off, I'd recommend a bar across the engine bay with a chain lift as you'll probably need all the space underneath the car you can get. But blocks underneath the sump would work too. The left side of the diff has a flange drive that will need to be pulled out. (I can't recall if it's held in place with a nut or a circlip though!). There are four bolts on each flange that need to be undone to remove the flanges that hold the seals. As Nigel said, don't lose the preload shims or mix them up. One side at a time. Reassembly is the reverse procedure. You'll need a bowl to catch the oil that will drain out, don't forget to refill once you're done.

Whilst you're doing this job have a look at the condition of the driveshaft boots and replace them if necessary. The inner CV Joint is held in place with a circlip, remove this and the joint will slide off. The outer CV joint boot can then be slid down the shaft and a new one installed. It's a job best done on the bench but can be done in situ if you keep everything clean.

Guy
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bobk
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« Reply #3 on: July 17, 2024, 02:42:03 PM »

Thanks guys - very helpful
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