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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 08-09-2011, 09:15 PM   #1
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Rebuilding a Smog/Air Pump

Hey all. Hoping someone might be able to help me out with my recent project. I got the dreaded check engine code and am headed down the bad smog pump road.

I pulled the pump and plugged my hoses for the meantime, but before I buy a pump I figured I'd try to rebuild the current one. The motor is the culpit. Looks like the brushes are shot after inspecting them through the can. No response at all from the motor when applying 12VDC to the contacts.

Tonight I carefully pulled the pump housing apart and removed the motor. I did some online searching using the markings on the motor (looking for replacement motor or a brush kit) and came up with nothing. Anyone have any idea where you could pick up a motor for this thing?


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Old 04-10-2012, 04:58 PM   #2
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Did you have any luck finding a new motor? I'm working on the same project, I have the housing half-way apart. I'm having trouble getting the fan off the motor/getting the motor out.
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Old 04-10-2012, 05:07 PM   #3
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Take it to a RC Hobby shop. The motor end bell looks like a closed design, however some of the old school guys still run brushed motors and they might be able to find you some brushes and true the comm for you.
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Old 04-10-2012, 05:12 PM   #4
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There's already about 13 threads on this in the past week alone. Search.

Some say his tires are green. Some say he once went 230k miles without a single oil change. All I know is: he's called The DMAX.
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Old 04-10-2012, 07:15 PM   #5
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Originally Posted by E46Mango View Post
There's already about 13 threads on this in the past week alone. Search.

Some say his tires are green. Some say he once went 230k miles without a single oil change. All I know is: he's called The DMAX.

Please, OP, let me know what you figure out...and hth.

Mango...some say my tires are green because they believe what I say. Those who've said my car could go 230K without changing oil are just hoping that there is a magically E46...there might be, but it ain't mine.

I change oil every 100K with my plugs just like it says in the Owner's Manual!
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Old 04-10-2012, 08:14 PM   #6
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tell us how it turned out !!!

You find a motor I have an x5 that has a bad pump and there 380 bucks ,Can they be rebuilt?
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Old 01-22-2014, 09:09 AM   #7
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Just wanted to update this thread for anyone interested.
I too got stuck taking my old SAP apart. The trick to removing the top half is to insert a solid rod (I used a copper rod) inside the cap, grip the cap with something (I used channellock pliers), then hammer rod. It took several hits, but it eventually came free of the motor. Click image for larger version

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Once that's off, your next PITA is to remove the motor from the housing. It's held in by a plastic, cup-like, device that has 6 areas that clip into the inside of the housing. I used a very small screw driver to pull each clip back, then inserted small paperclips to hold clip back while I worked on the 6 areas. You can use anything here that's small enough to hold the clips back.
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Once you have all 6 clips secured back, you can easily slide out the motor.

When you reassemble, just make sure you don't hammer the new motor onto the top half too hard. You want it secured, but not so pressed that the blades can't spin freely. Best to keep some play here as shown in photo. Click image for larger version

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Good luck to anyone attempting this in the future. It's a PITA, but very doable.

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