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Old 12-03-2020, 04:12 PM   #1
xDread92x
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Default Replacing ring seal between bellhousing and transmission case

Hey all,

So I have confirmed the ring seal between the bellhousing and transmission case on the AW70 is leaking.

Can anyone tell me the process of replacing this? Does the bellhousing come off and the ring seal is there or does the transmission pump need to be removed and further work is required.

Can anyone give me direction on this as there isn't much information available.

Thanks

**It appears the oring surrounds the oil pump** I am assuming the oil pump will have to be removed?

Last edited by xDread92x; 12-03-2020 at 05:48 PM..
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Old 12-03-2020, 06:32 PM   #2
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It appears this is the procedure. What can I do about the dowel pins and transmission pump puller?

https://ibb.co/8MXtVL3
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Old 12-03-2020, 08:39 PM   #3
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Be advised that the bolts that hold the bell housing to the case have VERY SHORT.shoulders. You have to be ultra careful or they will round off. New socket is a must. Best I remember you don’t remove the pump.
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Old 12-03-2020, 09:27 PM   #4
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I have pulled a couple bell housings swapping transmissions and cannot believe that the tiny little O ring has anything to do with a leak. There is absolutely no fluid available to leak between the outside of the transmission case and the bell housing.

On the inside there is fluid available to leak. I found that the bolts holding the bell housing to the transmission came out with sealant on the threads.

The oil pump O ring and drive shaft seal are much more suspect for leaks.

And the comments on the bolts holding the bell housing to the transmission body are true. Not only do they have little height to hold a socket but they were installed with sealant on the threads. A six point socket and about a 5 foot breaker bar will work much better than an impact wrench if you insist on verifying that nothing is leaking there.
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Old 12-03-2020, 10:30 PM   #5
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Yes testpoint from assessing the diagrams and the seeping through the bottom seam between the bellhousing and transmission case above the front of the tranny pan. The oil pump large oring appears to be the suspect.


https://ibb.co/LvCCY0K
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Old 12-03-2020, 11:29 PM   #6
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I've done this repair a bunch of times. When you remove bell housing you will see where the o rings go. No disassembly of pump. Replace both with Genuine Volvo parts. I think it was around $40 for the o rings. For the front pump seal, this is the one I use. https://www.fcpeuro.com/products/vol...495017#fitment
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Old 12-04-2020, 12:36 PM   #7
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Ok thanks

The directions I posted seem like it is involved to remove the bellhousing but I would definitely say the seal around the transmission pump is definitely the problem
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Old 12-04-2020, 01:38 PM   #8
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it's not impossible to do the repair without removing the pump and od unit, but it's also not as easy as presented here. you'll want a couple mallets to work the bellhousing off over the pump, and while you've got it apart you'll probably want to wire wheel all the rust off the outer rim of the pump so it might slide back together easier.

petroleum jelly to lubricate the rings and housings and it should slide back together.

the transmission is an asin-warner box, so the seals are still readily available and do not have to come from volvo. most of mine don't
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Old 12-04-2020, 03:44 PM   #9
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Thanks.

I do have one question regarding a swap. I have a tranny i pulled from a 92 240. I know its lh 2.4 and the 85 240 I have is lh 2.2. I know the bellhousing is different for the CPS on the 2.4 but what would the swap need.

Are there major flywheel differences? They are both AW70 with same overdrive units etc. Could the lh 2.2 flywheel and tc be swapped over on the lh 2.4 tranny? Or would bellhousings need to be swapped, etc.
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Old 12-05-2020, 08:50 AM   #10
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The later unit will work. Always replace the converter seal. Not fun pulling it again because the old one is leaking.
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Old 12-05-2020, 10:57 AM   #11
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Hmm okay thanks guys.

Is the converter seal the same as the input shaft seal?
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