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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Tue, Jul-08-2014, 01:12:09 AM   #131
SliM3
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Default Re: M3 SMG pump reconditioning

Little update fellas:

I managed to strip the SMG pump down to pretty much nothing and wanted to post a few pics for reference.

Aluminum block, pump head & pressure relief valve



Pump head showing the pinions, with a .25 cent piece for size comparison



Block, pump head, & pressure relief valve disassembled



Pressure relief valve:
I don't recall this ever being mentioned in this thread, and if so my apologies. After looking at everything, the pressure relief valve looks to serve a dual purpose.
  • First, this is where the fluid returns to the reservoir by overcoming the spring rate when the shift cylinders are actuated.
  • Second, per the function of a pressure relief valve it serves to regulate system pressure and protect the accumulator in an event where the electric motor might run continuously (for instance).
If the spring inside were to fail or the o-ring deteriorates it's possible fluid will leak back into the reservoir, subsequently slowly bleeding-off system pressure, and causing the electric motor to run continuously. I could also see this being mistaken as a bad accumulator.

Unfortunately this little $0.95 part is non-replaceable and could cost you a pump. Very unlikely, but still worth considering when troubleshooting.




I'm (slowly) working on a Solidworks model of the aluminum block so we can have a clear picture of how fluid flows through it. Stay tuned..
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- Checksum corrections for modified DME partial & full bin files

- CSL SMG Engine Parameters (DME) by Slim

- Fuel adaptations explained

- Checksum Verification
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Old Tue, Jul-08-2014, 05:59:50 AM   #132
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Default Re: M3 SMG pump reconditioning

Are you sure about the pressure relief valve? I'd believed it to be a one way valve with pressure relief such that pressure wouldn't bleed back when the pump stopped, but also that it would prevent over pressuring the system if the pump overran.

There are two drillings in the block, one right next to the valve, which appear to be used for fluid return.

Some more close up photos of the individual parts would be good, as per my first post. Macro time!

Thanks,

Steve
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Old Tue, Jul-08-2014, 11:51:21 AM   #133
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Default Re: M3 SMG pump reconditioning

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Originally Posted by SteveEvans View Post
Are you sure about the pressure relief valve? I'd believed it to be a one way valve with pressure relief such that pressure wouldn't bleed back when the pump stopped, but also that it would prevent over pressuring the system if the pump overran.

There are two drillings in the block, one right next to the valve, which appear to be used for fluid return.

Some more close up photos of the individual parts would be good, as per my first post. Macro time!

Thanks,

Steve


Here's a crude drawing of the pressure/return circuit machined into the aluminum block, verified by snaking safety wire through the various ports. Again, I'll get the Solidworks model done to illustrate it a little better.

If you you look at the top of the block where the outlet ports are you'll see one of the plugs used after drilling (indicated by black dots), and the two located on the side.

I believe there is also a ball/spring type check valve installed in the block right after the pump pressure inlet. Obviously this prevents pressure from surging back into the pump head and destroying the electric motor.

You can see how all the ports intersect in one way or another, with the pressure relief valve as the common return back to the reservoir. Also, that is the only direction of flow through the valve (pressure/return circuit <O----- reservoir).

I have to look at the block again, as it's not in front of me, but I meticulously looked over this thing and didn't see any other ports intersected other than the ones I identified.

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DEMOCRACY is two wolves and a lamb voting on what to have for lunch.
LIBERTY is a well-armed lamb contesting the vote.
-Benjamin Franklin


- Checksum corrections for modified DME partial & full bin files

- CSL SMG Engine Parameters (DME) by Slim

- Fuel adaptations explained

- Checksum Verification

Last edited by SliM3; Tue, Jul-08-2014 at 11:55:04 AM.
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Old Tue, Jul-08-2014, 07:57:55 PM   #134
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Default Re: M3 SMG pump reconditioning

I stand corrected.



Edit: Just realised I posted this very image on the previous page! Doh!

Steve
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Old Tue, Jul-08-2014, 09:32:05 PM   #135
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Default Re: M3 SMG pump reconditioning

No sir!! Actually I stand corrected. Didn't notice it before but it looks like they machined inside two of the solenoid ports, where the holes are drilled, for return.

Definitely good to know what pressure the relief valve opens.


Sent from my Stenograph.
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///M3 '06 Carbon Black

DEMOCRACY is two wolves and a lamb voting on what to have for lunch.
LIBERTY is a well-armed lamb contesting the vote.
-Benjamin Franklin


- Checksum corrections for modified DME partial & full bin files

- CSL SMG Engine Parameters (DME) by Slim

- Fuel adaptations explained

- Checksum Verification
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Old Tue, Jul-08-2014, 09:43:49 PM   #136
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Default Re: M3 SMG pump reconditioning

Loving this thread And yes I do think it should be a 'sticky', not sure if here in the E46 section or DIY section.

I know there's places to replace or rewind the motor but are there any i.d. markings to compare if the SMG pump motor is the same as the DSC motor or even the ABS motor from a few Ford cars as mentioned on this forum? The Ford motors are way cheaper.
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Old Tue, Jul-08-2014, 09:54:11 PM   #137
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Default Re: M3 SMG pump reconditioning

Quote:
Originally Posted by SliM3 View Post
No sir!! Actually I stand corrected. Didn't notice it before but it looks like they machined inside two of the solenoid ports, where the holes are drilled, for return.

Definitely good to know what pressure the relief valve opens.


Sent from my Stenograph.
We're all learning!

Interesting SMG 2 manual HERE if you've not seen it before.

Steve
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Old Tue, Jul-15-2014, 05:31:13 PM   #138
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Default Re: M3 SMG pump reconditioning

I just bought a used smg pump but it came with a broken red snap ring ( anyone have a spare ?? I would be so greatly thankful! Let me know what you need for it I hope we could work something out! Thank u again
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Old Mon, Jul-21-2014, 03:10:55 PM   #139
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Default Re: M3 SMG pump reconditioning

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Originally Posted by jdamore44 View Post
I just bought a used smg pump but it came with a broken red snap ring ( anyone have a spare ?? I would be so greatly thankful! Let me know what you need for it I hope we could work something out! Thank u again
Which snap ring are you talking about? Send me a picture. I have a bunch of spare stuff at home but not sure if I have one of those. I'll be home later today to look.
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Old Mon, Jul-21-2014, 03:37:36 PM   #140
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Default Re: M3 SMG pump reconditioning

Quote:
Originally Posted by SouthTexasE46 View Post
Which snap ring are you talking about? Send me a picture. I have a bunch of spare stuff at home but not sure if I have one of those. I'll be home later today to look.
Here is a link and a picture. Its a sensitive lil guy.. most people break them because you have to push the red rim down and pull up on tube. I would be forever grateful if I could find a good one
http://www.m3forum.net/m3forum/showthread.php?t=250333
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Discussing M3 SMG pump reconditioning in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)