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post #1 of 12 Old 1st July 2015, 03:24 AM Thread Starter
anatoly14
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SMG Pump Part? (Yeah, another SMG thread)

Ok guys, I just purchased 2006 BMW M5 3 a month ago and I've been reading up on this whole SMG pump failure issue and I'm a little bit confused.
So, the part that fails is the SMG Pump.
Is this the part:
ecstuning.com/BMW-E60-M5-S85_5.0L/Drivetrain/SMG_Transmission/ES42124/

Or is there 2 pumps, one "SMG pump" that costs an arm and a leg and one SMG Electric Pump? Or it's just one pump?

So, if there is only one pump, I assume this one:
ecstuning.com/BMW-E60-M5-S85_5.0L/Drivetrain/SMG_Transmission/ES42124/

Why the parts cost is 3k+? Or you can't just replace the pump, you have to replace the whole hydraulic unit?
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post #2 of 12 Old 1st July 2015, 03:44 AM
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Quote:
Originally Posted by anatoly14 View Post
Ok guys, I just purchased 2006 BMW M5 3 a month ago and I've been reading up on this whole SMG pump failure issue and I'm a little bit confused.
So, the part that fails is the SMG Pump.
Is this the part:
ecstuning.com/BMW-E60-M5-S85_5.0L/Drivetrain/SMG_Transmission/ES42124/

Or is there 2 pumps, one "SMG pump" that costs an arm and a leg and one SMG Electric Pump? Or it's just one pump?

So, if there is only one pump, I assume this one:
ecstuning.com/BMW-E60-M5-S85_5.0L/Drivetrain/SMG_Transmission/ES42124/

Why the parts cost is 3k+? Or you can't just replace the pump, you have to replace the whole hydraulic unit?

Yes that is the electric motor that drives the hydraulic pump in the smg hydraulic block..

What fails is this electric motor you have linked. B767CAPT has an amazing DIY for this pump aswell.

You dont need to replace the whole hydraulic unit...

Most common failures ive seen within the hydraulic system on this board is the slave, electric motor, clutch control solenoid aka the directional control valve above the electric motor (which seems to be rare as well). Everything else doesn't seem to fail often at all.

BMW set up its repair instructions to make it easy on its dealers and techs to just replace the whole hydraulic system that includes the clutch slave, PLCD, e-motor, etc in the wise words of Jcolley; at a shotgun attempt to resolve a issue instead of troubleshooting the wrong items since almost all techs arent aware of how a SMG works.

Last edited by 5soko; 1st July 2015 at 03:44 AM.
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post #3 of 12 Old 1st July 2015, 02:07 PM
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This is the part # for the electric motor - 23017841032.

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post #4 of 12 Old 2nd July 2015, 12:35 AM Thread Starter
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Quote:
Originally Posted by 5soko View Post
Yes that is the electric motor that drives the hydraulic pump in the smg hydraulic block..

What fails is this electric motor you have linked. B767CAPT has an amazing DIY for this pump aswell.

You dont need to replace the whole hydraulic unit...

Most common failures ive seen within the hydraulic system on this board is the slave, electric motor, clutch control solenoid aka the directional control valve above the electric motor (which seems to be rare as well). Everything else doesn't seem to fail often at all.

BMW set up its repair instructions to make it easy on its dealers and techs to just replace the whole hydraulic system that includes the clutch slave, PLCD, e-motor, etc in the wise words of Jcolley; at a shotgun attempt to resolve a issue instead of troubleshooting the wrong items since almost all techs arent aware of how a SMG works.
Got it! Thanks for clarification!
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post #5 of 12 Old 8th June 2016, 07:47 PM
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Quote:
Originally Posted by Cinder View Post
This is the part # for the electric motor - 23017841032.
Any early warning signs of a failing motor before it goes out? Is this issue linked to any specific E60 Model year with SMG? 2006 - 2010? Replacing this pump motor sounds like a good PM item to add to the list...
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post #6 of 12 Old 16th June 2016, 04:49 PM
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You may get yellow/red cogs and undershooting pressure errors logged. The pump may also prime more often due to being unable to maintain stable pressure. It's a good item to change preemptively.

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post #7 of 12 Old 17th June 2016, 04:49 AM
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post #8 of 12 Old 7th July 2016, 06:18 AM
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Quote:
Originally Posted by Cinder View Post
You may get yellow/red cogs and undershooting pressure errors logged. The pump may also prime more often due to being unable to maintain stable pressure. It's a good item to change preemptively.
How often does the hydraulic pump run? Is there a way to measure this or compare to good hydraulic systems?

Mine comes up with a pump runs too frequent fault. I think its a leak rather than the motor?
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post #9 of 12 Old 7th July 2016, 12:56 PM
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Motor brushes wear, carbon dust builds up, motor torque decreases, motor runs longer to build same pressure. Inherent characteristic of brushed DC motors.

Replace the motor on the pump and problem solved.

I am pursuing some options for these including a brushless replacement setup, but still in planning stages.
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post #10 of 12 Old 7th July 2016, 01:13 PM
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Quote:
Originally Posted by jcolley View Post
Motor brushes wear, carbon dust builds up, motor torque decreases, motor runs longer to build same pressure. Inherent characteristic of brushed DC motors.

Replace the motor on the pump and problem solved.

I am pursuing some options for these including a brushless replacement setup, but still in planning stages.
Thank you for the insight - Is there any way to check the motor or run a test in rheingold to check the motor?
I did a test in rheingold for the pressure build up, it goes up to 65 (bar i think) and during the test it seems to bleed off rather quickly down, down, down all the way to 20 bar before i stoped it because i don't like not knowing what is going on lol.
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