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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-17-2018, 04:12:48 AM   #1
vollosso
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Default Smg motor

For those of you contemplating a smg motor replacement, here is what happened to me.

Test your base pressure and leakdown if these are good but your still getting codes 53/56. Check your time to max pressure, for me it took about 1 minute to build up from 50-85bar.

When I would shift a couple times pressure would drop below 50 and it would drop to neutral.

Temperature had no effect on the cars ability to build pressure, but instead how long it took to build it. Probably the drop in viscosity. This would result in more neutral drops more often.

Today I pulled the smg motor and checked the “consumables.” Ie brushes and commutator.

The commutator was totally worn out. Wear like this will drop motor power and would lead to slow pressure buildup. I ordered a replacement motor and will post the results but this is as much of a smoking gun as I ever get.




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Last edited by vollosso; Tue, Jul-17-2018 at 02:32:12 PM.
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Old Tue, Jul-17-2018, 04:48:42 AM   #2
Texaz3
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Default Re: Smg motor

Brushes look fine to me. Still plenty of life left. Its very dirty and that might affect its performance.
But motor, and pressure accumulator, are components that fail faster than a pump would, and are much cheaper to replace than entire unit.
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Old Tue, Jul-17-2018, 04:49:22 AM   #3
vollosso
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Default Re: Smg motor

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Originally Posted by Texaz3 View Post
Brushes look fine to me. Still plenty of life left.
But motor, and pressure accumulator, are components that fail faster than a pup would, and are much cheaper to replace than entire unit.


Brushes fine commutator very not fine


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Old Tue, Jul-17-2018, 05:07:47 AM   #4
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Default Re: Smg motor

agreed, it's toast.

Here's an updated link to a company that sells new OE motors with temp sensor (I expect the sensor is normally not needed).

https://www.ebay.com/sch/i.html?_fro...04641&_sacat=0

I've communicated with the seller this week, and I'd save this off as actual sale links go stale.
Ebay seller Userid is: egcmpgrp

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Old Tue, Jul-17-2018, 01:49:24 PM   #5
Texaz3
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Default Re: Smg motor

Interesting. Might be a good option for those with failed/failing motors.
I have not researched, but I assume motors are not available separately from BMW?
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Old Tue, Jul-17-2018, 02:08:14 PM   #6
vollosso
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Default Re: Smg motor

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Originally Posted by Texaz3 View Post
Interesting. Might be a good option for those with failed/failing motors.
I have not researched, but I assume motors are not available separately from BMW?


Not available separately but any dc motor shop should be able to fix you up. Or there’s a few companies offering rebuilt/new motors.


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Old Tue, Jul-17-2018, 02:30:29 PM   #7
Texaz3
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Default Re: Smg motor

I'm yet to have any problems with my SMG on my M3, but I had a hell of a time with my M6, where I replaced pretty much everything, including SMG pump motor, so very familiar with the situation. M6 SMG motor is available as a separate part from BMW, though.
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Old Tue, Jul-17-2018, 02:42:50 PM   #8
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Default Re: Smg motor

Just did the pump relocation to the drug bin on mine (did it during a pump rebuild) and hopefully by moving it away from the headers, heat won't continue killing the motor. There are lots of good sources out there for all sorts of SMG parts:

http://www.smgsociety.com/
https://mlreng.com/
https://blunttech.com/ (burkhart engineering US distributor)
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Old Tue, Jul-17-2018, 03:28:18 PM   #9
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Default Re: Smg motor

Didn't know Burkhart had US distributor. Cool, thanks.
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Old Tue, Jul-17-2018, 03:41:59 PM   #10
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Default Re: Smg motor

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Discussing E46 M3 Market Sales Tracker: Please Report Your Purchase or Sale! 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)