O-rings for SMG pump - BMW M5 Forum and M6 Forums
E60 M5 and E61 M5 Touring Discussion 2005- Advertiser's Forum

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post #1 of 3 Old 27th March 2019, 02:49 AM Thread Starter
GregZ
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O-rings for SMG pump

Hi All,


The following is without any guaranty, this has worked for me it may not work for you. Do it at your own risk.


I have refurbished my SMG pump (removed, cleaned, filed stamping on brushes - you can search for threads here on how to do this). For the reassembly one needs o-rings (preferably viton). I was unable to find size specs, so I measured and ordered them from oringsandmore.com (around $15 for a lot of o-rings as they come in packs of 5,10, sometimes 50). Make sure you scroll down on their web and get the Metric Viton/FKM Orings



Here are the sizes:
- 75.79x3.53mm (large for sealing container to pump body)
- 63x2mm (large for sealing motor against pump)
- 13x2.5mm (on container)
- 5x1.5mm (pump face small)
- 19x1.5mm (pump lip)
- 9.25x1.78mm (into container)

The metal band (clamp) on the container is 9mm wide. I got two stainless 9mm wide stainless hose clamps for $9 from ebay (Narrow Band 9mm Steel Hose Clamp 80-100mm Made in Germany Pack of 2 HC80-100/9)

I also got a liter of CHF 11S fluid on ebay for $15.

My container plug was cracked (which is $60 from BMW). I made another bolt; you can find the details here: https://www.m5board.com/vbulletin/e6...iner-plug.html (If you do this, be sure to use a viton o-ring around the bolt's head and be very-very careful on how much you tighten it).

While the relays were out, I opened them, cleaned them and carefully sanded the contacts to get rid of burn-ins (old school switch/relay refurbishing trick).

All-in-all $50 (and my o-ring collection grew). I hope to get another 50kmiles out of it. (And I also hope to win the lottery.)



I hope someone will find this useful.

2007 M6-E64

Last edited by GregZ; 27th March 2019 at 02:50 AM.
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post #2 of 3 Old 27th March 2019, 08:11 AM
flacoramos
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What??? No pics???

But yeah joking aside good info. Did you have the trans out or in the car? If out I would have added all the stuff from the top of the unit (gear position sensor, solenoid orings). Either way you were 2 screws away from replacing the clutch solenoid orings - made a nice shifting improvement on my car.
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post #3 of 3 Old 27th March 2019, 08:12 AM
flacoramos
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Oh and the relay is (was) about $15. When sanding those contacts you take away some or all of the coating they have. You may have accelerated wear if that coating is gone.
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