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Old 06-03-2014, 12:20 AM   #1
AustinTurner
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Questions about the m3 smg

So I have owned a 2003 m3 for 2 weeks. It has a smg trans that has been working flawlessly, but for the past two days it has been going into nuetural at red lights/ stop and go traffic. This worried me, but after some reaserch and testing I am 90% sure that it is the HVU temp sensor, no problem. Now what I wanted to ask is, has anybody ripped a failed pump apart to see what went wrong? It seems to me that they have trouble around 80,000 miles. If( or more likely when) my pump fails I might try to add more cooling and filtration on the new one to see if it has more longevity. Has anybody attempted this? Also it seems to me that bmw should have caught the problem after the first or second year of using this smg model, but I guess not. I have some experience with hydraulic pumps on heavy machinery( farmer) and they typically have a much longer life, I would expect a bmw to be built better than my freaking tractor. Anyway all constructive answers are highly appreciated!
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Old 06-03-2014, 12:38 AM   #2
Cavi Mike
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Most likely the pump on this is a vane pump. They're quieter than the gear pumps on your tractors but they're obviously not as robust.
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Old 06-03-2014, 12:40 AM   #3
Cavi Mike
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Oh and you should prolly ask this in the M3 subforum.

http://forum.e46fanatics.com/forumdisplay.php?f=65
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Old 06-03-2014, 10:43 AM   #4
jcns
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How much does your tractor pump weigh?
It's a M3 and that's why they did not want to fit in a 30+lb pump.
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Old 06-03-2014, 12:08 PM   #5
Hobohunter
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In case you haven't looked into it, the hood not being fully closed or hood sensor(s) not sensing the hood fully closed will cause the SMG to go to neutral if stopped for more than a few seconds.
This happened to me within the first week of getting the 02 M3 SMG I used to have. It also causes the gear selected indicator to flash the whole time you are driving.
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Old 06-03-2014, 03:43 PM   #6
AustinTurner
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Originally Posted by jcns View Post
How much does your tractor pump weigh?
It's a M3 and that's why they did not want to fit in a 30+lb pump.
I would agree. Except for the fact that the amount of pressure and stress on my tractors pump is MUCH greater hence the size. I'm guessing that the smg's pump is proportionate to the amount of work it is required to do. bmw engineers aren't stupid.
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Old 06-03-2014, 03:48 PM   #7
AustinTurner
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Originally Posted by Cavi Mike View Post
Most likely the pump on this is a vane pump. They're quieter than the gear pumps on your tractors but they're obviously not as robust.
The truck I use to haul my grain uses vane pumps. I have never needed to repair one because(IMO) they are much more efficient(like 35%) leading to longer life's due to less work.
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