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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 08-12-2010, 01:28 PM   #21
carsos
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so what's the reason behind fanatics preferring the stewart water pump? the ECS tuning kit looks convenient and is priced right, but if there's a compelling reason, i'll get the stewart water pump.
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Old 08-12-2010, 05:44 PM   #22
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How long did it take you to do this?
Took me about 6.5 hours with a few short breaks, but it looks like you've got a radiator to do as well. I've never replaced one before but it doesn't seem like it would be that much more work, maybe another 30 mins?

Shortyb aslo had some good comments about the Expansion tank.


Another thing I would like to say is that, after reading this thread, Joe at ECSTuning decided to rectify the fact that there was no kit with the aluminum ECS pulley when I ordered, so he sent one to me free of charge. I think that really says something about ECS as a company and Joe as a service rep, they're awesome! I would definitely recommend them as a vendor
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Old 08-26-2010, 06:59 AM   #23
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when you unscrewed the four bolts on the WP pulley, did the pulley come right off when u pulled it out? I think mine is rusted and i sprayed it with WD40 and nothing happened
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Old 12-03-2010, 05:30 PM   #24
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Nice write up! Just a heads up for wagon owners- if you buy a cooling kit be sure you are getting the correct radiator for the wagon. BMW uses a thicker, extra capacity version in the wagon which I notice is not always listed on vendors web sites.
has anyone ever put a wagon rad into a regular sedan/coupe then? If it fit that would give you a little extra cooling capacity right?
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Old 12-03-2010, 05:33 PM   #25
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Just curious. I think I already know the answer, but does that kit come with all three tensioner rollers? And did you replace those? What about your belts? Props on the cooling system--you did it right. But there's more to the cooling system than whats in the kit.
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Old 12-03-2010, 05:34 PM   #26
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when you unscrewed the four bolts on the WP pulley, did the pulley come right off when u pulled it out? I think mine is rusted and i sprayed it with WD40 and nothing happened
If you're not reusing the pulley or the water pump, just take both out as a unit and toss it. Otherwise put a piece of cloth between the pulley and a screwdriver and just pry it apart.
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Old 12-03-2010, 05:46 PM   #27
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nice DIY! alot of this is already posted on other threads but its good to have all of it in one single post...great job! ECS should hook you up with a discount
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Old 12-03-2010, 08:42 PM   #28
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Great write up OP, but I gotta ask what was wrong with your current parts? Like what was wrong with your hoses or ET?

Also, why did you change your crappy OEM WP for the same crappy one?
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so what's the reason behind fanatics preferring the stewart water pump? the ECS tuning kit looks convenient and is priced right, but if there's a compelling reason, i'll get the stewart water pump.
Reason why many people, including myself, choose Stewart WP, is because of its design and durability. I couldnt care less about the fact that it pumps more volume, I only care that it has a lifetime warranty and the fact that its bearing is tough and will NOT fail. OEM pumps are crap, ALL of them. Plastic ones will desegregate and the metal impeller ones cause the bearing to crap out very prematurely.
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Old 12-04-2010, 07:05 AM   #29
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I second the comment on the metal impellar reducing the life of the WP bearing. Last spring I accomplished a timing belt replacement on my 2003 Ford Focus using a terrific DIY from another site. Of course I did the smart thing and as a precaution replaced all belt tensioners and WP and the new WP had a metal impellar which at the time I was pleased to see. Less than 6 mos. later I was back in replacing that WP with a new one. Not that it was a big deal to replace but I was kinda pissed I took the time to replace a part with no issues as a hedge against future problems and ended redoing the job anyway. Upcoming cooling sys. overhaul on my 2003 330xi will include the stewart pump. I try to learn from any life lesson dished out.
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Old 02-18-2011, 07:14 PM   #30
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This DIY looks GREAT!
I just ordered my Level 2 kit with pulley from ECS Tuning. I also Ordered Dayco pulley for my mechanical tensioner. Everything should arrive by next week and i'll post my results.
Peace.
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Old 02-21-2011, 12:38 PM   #31
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Thanks again for the orders everyone and let us know if you have any questions!
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Old 05-18-2011, 06:47 PM   #32
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when you unscrewed the four bolts on the WP pulley, did the pulley come right off when u pulled it out? I think mine is rusted and i sprayed it with WD40 and nothing happened
mine won't budge either, it looks rusted on. i tried some pb blaster, that didn't seem to help.

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If you're not reusing the pulley or the water pump, just take both out as a unit and toss it. Otherwise put a piece of cloth between the pulley and a screwdriver and just pry it apart.
you can't reach the bolts for removing the water pump without first removing the pulley

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Old 05-19-2011, 03:37 AM   #33
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Good write up
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Old 05-19-2011, 10:26 AM   #34
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I believe this is temperature sensor, not the fan switch.
Fan switch is connected higher up on the side of the fan.

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Old 05-19-2011, 10:31 AM   #35
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Excellent writeup and great job! Thanks for taking the time to help us all out
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Old 05-20-2011, 03:02 PM   #36
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after having learned a nice lesson, i think it might help someone else if this was edited into the OP: ***the bolt in the hydraulic belt tensioner MIGHT be T50, but some are 8mm hex!***

here's what happened to me: since it's in a tight spot and was hard to see, i put the T50 bit into the bolt by feeling around, and it fit right in. turns out, a T50 bit will fit into an 8mm hex socket, but once you apply pressure to detension the belt, the T50 will strip it. so, cautionary tale: visually check which bolt your tensioner has before doing anything! i had to remove the tensioner and extract the stripped bolt. i got a replacement bolt from BMW and the new one is indeed T50.

attaching a bonus picture of my disaster.
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Old 05-20-2011, 06:01 PM   #37
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Is this proven to add HP or any differences?
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Old 10-01-2011, 08:20 AM   #38
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OP did you purchase the aftermarket kit or OEM?

if aftermarket, how was the fitment on everything?
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Old 10-03-2011, 10:26 AM   #39
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OP did you purchase the aftermarket kit or OEM?

if aftermarket, how was the fitment on everything?
In case the OP ordered the OEM, our aftermarket kit fitment is just as nice as the OEM. All parts contained in the kit are quality OEM replacement parts.

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Old 10-03-2011, 10:46 AM   #40
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ECS, I still think you are misleading customers (maybe not on purpose) into a false sense of security with your cooling "kits". I've bought parts from you and generally have received good service, so don't take this the wrong way. Take it as advice.

You guys need to a)bring the price down of these kits just a tad, and b)include the tensioners and belts with the kits. And even the radiator. Until then, replacing two hoses and a water pump really isn't a refresh.

A BMW cooling system is only as strong as its weakest link. And a lot of times, its the belts and tensioners are it. Not to mention fan blade and fan clutch for automatics. Any of the parts *not* included in your kit have a tendency to fail and will bring down the cooling system.
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