SMG Hydraulics Failure analysis - Page 2 - BMW M5 Forum and M6 Forums
E60 M5 and E61 M5 Touring Discussion 2005- Advertiser's Forum

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post #11 of 18 Old 9th May 2019, 06:34 PM
335xi
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So, how easy is this to do?

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Originally Posted by Ferris View Post
Wanted to throw a quick follow up and observations. Now that I replaced my Real main I've got a chance to do a lot more observations in inpa.

I wish I had a chance or at least forethought to log some data when the car was new. Now, after the rebuild, though there is little to no pressure drop when cruising in the same gear or over night. The pump rarely kicks on when opening the door or unlocking, Also it looks once the clutch is pushed in , ie at a light, there is hardly any pressure bleed. As we'd expect pressure drops when gears or the clutch moves. Also pressure builds right away right after the pump kicks on.

These are merely just data points , I wish I knew earlier. I may try to get testo to log all this so we can get into a spreadsheet.
Is the pump basically 2 halfs or will it spill a bunch of parts once opened?
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post #12 of 18 Old 9th May 2019, 06:38 PM Thread Starter
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Originally Posted by 335xi View Post
Is the pump basically 2 halfs or will it spill a bunch of parts once opened?
The pics are above to give you an idea, but basically it's a body two end caps, seals, and gears.

It's a basic hydraulic pump design.

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post #13 of 18 Old 9th May 2019, 06:48 PM
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yeah, never opened a pump up before

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Originally Posted by Ferris View Post
The pics are above to give you an idea, but basically it's a body two end caps, seals, and gears.

It's a basic hydraulic pump design.

But if I could open without parts spilling out, putting new oring in and closing it back up that would be something I can handle.
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post #14 of 18 Old 9th May 2019, 06:54 PM Thread Starter
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Quote:
Originally Posted by 335xi View Post
But if I could open without parts spilling out, putting new oring in and closing it back up that would be something I can handle.
Well I don;t know you so I can't make that call....

Seriously though it's very simple part orientation matters at least in terms of the bronze sealing plates . So just take your time and pay attention and you'll be fine.

If you get stuck mail me the parts and a cup of coffee and i'll reassemble it for you

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post #15 of 18 Old 10th May 2019, 04:30 PM
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Rebuilding my spare SMG Pump

Thanks for the information and thread. I will be rebuilding the one that just came out my car. I saw and item on ebay for the shaft driven off the electric motor. Has anyone replaced that whole doing this? Mine is beat up where the coupler connects.

Cheers
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post #16 of 18 Old 10th May 2019, 04:38 PM Thread Starter
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Quote:
Originally Posted by h8c18 View Post
Thanks for the information and thread. I will be rebuilding the one that just came out my car. I saw and item on ebay for the shaft driven off the electric motor. Has anyone replaced that whole doing this? Mine is beat up where the coupler connects.

Cheers
Post pics I'd like to see a gnarled up shaft, the coupling should've taken all the abuse not the shaft.

I don't think anyone has here replaced the shaft gear, as long as they're manufactured to proper tolerance you should be fine.

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post #17 of 18 Old 18th May 2019, 08:51 PM
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Transmission overhaul is done. Car got new clutch, flywheel, slave cylinder, transmission mounts, SMG-acculator, SMG-electric motor, new o-rings for solenoids (from Fast attack motorsport) and SMG-hydraulic pump internal seals and "unicorn piss" hydraulic fluid (from Burkhart engineering).

Before repairs it took almost 8s to SMG prime in the mornings and got a sqeeking sound when changed gears. Now it takes 1.5s to prime and squeeking sound is gone. Sound was coming from throwout bearing which was original and it was sticking. Old SMG-hydraulic pump internal seals were in good condition.

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Ex. BMW E39 ///M5 -01

Current mods: Short shifter, Custom clutch stop, Alpha-N + Power tuning by Evolve, AP coilovers, HEL brake lines.

Last edited by J.R ///M5; 19th May 2019 at 05:47 AM.
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post #18 of 18 Old 19th May 2019, 02:54 AM
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