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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > Replacing crankcase breather hose, anything else while intake manifold is removed?



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      05-03-2020, 06:29 PM   #1
AoS810
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Replacing crankcase breather hose, anything else while intake manifold is removed?

Hi e90post,

I'm still chasing a slight rough idle and figured I'd change out the Crankcase Breather Hose 11157559528 just to rule that out as mine is original 2008 N51 with 157K miles.

https://www.fcpeuro.com/products/bmw...se-11157559528

This process involves removing the intake manifold so I figured is there anything else besides the starter motor that I should replace while I have this removed? I'm not having any issues starting the car so I will be leaving that alone.

I'm planning to check the two disa valves to see if they're broken.. and also replace the below?

https://www.fcpeuro.com/products/bmw...ch-12611710509 Oil Pressure Switch
https://www.fcpeuro.com/products/bmw...ng-11617547242 Intake Manifold Gasket Set
https://www.fcpeuro.com/products/bmw...al-13547522361 Throttle Body Gasket

Debating on the throttle body gasket.. don't have a good reason to replace and I haven't read on here that it's a preventative maintenance item. I'm not getting any codes but the idle just is rough occasionally and I do see the foam on the hose is broken off, probably from when the dealership performed the PCV recall.

Thanks,

- James

Last edited by AoS810; 05-03-2020 at 07:01 PM..
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      05-04-2020, 09:04 AM   #2
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Heater hoses are easier to change with the manifold off. Check their condition under your airbox. They can get soft when oil from the OFHG leaks onto them.
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      05-04-2020, 10:05 AM   #3
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I took the time to clean the intake runners on the head with brake clean and a microfiber wrapped on a dowel. Be careful deep in there, don’t want to damage the valve stems.
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      05-04-2020, 03:43 PM   #4
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At 160k miles, I would reconsider replacing the starter as a precaution while you're in there. A new Bosch OE starter (SR0492N) can be had for only $130-150. A ratcheting E14 wrench makes it a breeze.

Intake manifold gaskets are a must. You could probably get away with reusing the throttle body gasket but it's cheap enough to replace. Oil pressure sensor can be done without removing the manifold so I would leave that unless you have a reason to replace it

Last edited by freedomfries; 05-04-2020 at 03:49 PM..
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      05-04-2020, 06:21 PM   #5
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Quote:
Originally Posted by freedomfries View Post
At 160k miles, I would reconsider replacing the starter as a precaution while you're in there. A new Bosch OE starter (SR0492N) can be had for only $130-150. A ratcheting E14 wrench makes it a breeze.

Intake manifold gaskets are a must. You could probably get away with reusing the throttle body gasket but it's cheap enough to replace. Oil pressure sensor can be done without removing the manifold so I would leave that unless you have a reason to replace it
Sounds good, always appreciate your input freedomfries!

For those planning to do this, I found an awesome video for a starter replacement that involves removing the intake manifold that I've found to be very helpful. There's a bunch of DIYs to reference on e90post and pelicanparts but having a detailed video to reference has definitely helped my nerves.


Last edited by AoS810; 05-05-2020 at 12:27 AM..
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      05-05-2020, 02:17 PM   #6
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That's a great video - I believe I referenced it as well when I did my 3IM and starter. Another tip is to flag everything you disconnect/unplug with tape so that you don't miss anything during reinstallation.

The biggest pain was reinstalling the junction box screws due to their short length
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      05-05-2020, 05:47 PM   #7
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Quote:
Originally Posted by freedomfries View Post
The biggest pain was reinstalling the junction box screws due to their short length
I imagine my biggest pain will be disconnecting the crankcase breather hose at the back of the valve cover.. not looking forward to that from what I've read.
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      05-06-2020, 06:57 AM   #8
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Quote:
Originally Posted by AoS810 View Post

Debating on the throttle body gasket..
It is green silicone, not likely will need replacement.

If your starter once in a while not turning for a second but then starting to turn then it is starting to die. Mine did that for a year intermittently, especially when engine was already warm and then one day it didn't start at all and that was it. You don't have the '06 year N52 so manifold removal is easier, you can wait on that.
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      05-06-2020, 11:05 AM   #9
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Quote:
Originally Posted by PhaseP View Post
It is green silicone, not likely will need replacement.

If your starter once in a while not turning for a second but then starting to turn then it is starting to die. Mine did that for a year intermittently, especially when engine was already warm and then one day it didn't start at all and that was it. You don't have the '06 year N52 so manifold removal is easier, you can wait on that.
Unfortunately I just ordered all the parts last night including the throttle gasket! I figured if I have to remove the throttle body to remove the intake manifold I might as well clean up the throttle body with some CRC spray and replace the gasket.

I was looking at intake manifold videos and checked my car, it seems like my E90 2008 N51 has an extra little hose coming out from the little plastic elbow that connects the metal throttle body to the airbox silencer connection pictured here:

"Working at throttle body intake air duct, pull off vacuum hose. (green arrow)"
https://www.pelicanparts.com/BMW/tec...mall/pic10.jpg.

Is that hose usually difficult to remove? I'm afraid of breaking off the nipple thing if it's become brittle at 157K miles.
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      05-06-2020, 08:30 PM   #10
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I would be very surprised if you have that hose. As far as I know only very early build like up to December 2005 N52's had that hose. Later ones don't have it. The throttle body connector hose is nylon or some sort of plastic like it, it is not brittle.
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      05-06-2020, 08:36 PM   #11
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Interesting, looked at realoem.com, the N51's have that hose (besides very early build N52). It must be related to N51 SULEV.

Don't know about that hose becoming brittle or not, from pictures looks like regular rubber vacuum hose. I wrote the nipple it connects to is not brittle. On my car the nipple is molded closed since it doesn't use it.
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      05-11-2020, 02:14 AM   #12
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For anyone with an N51, that extra hose on the throttle body plastic piece (mentioned above), is very easy to remove by simply twisting the hose side to side gently a couple times to loosen and then pull it straight out slowly. This is with 157K miles so the age didn't cause it to get stuck or brittle.

freedomfries was right that the junction box screws are going to be absolute suckage to get back on. It wasn't easy just taking them off so I can only imagine how fun it'll be to put it back together.

The part I'm stuck on at the moment is the "pinch" hose that's kind of in between the inner part and outer part of the manifold. It's the same kind of connection as the two pinch hoses that need to be disconnected on the inside of the manifold (crankcase breather hose). I'm not sure if it's because of my car's age, but it's stuck on there really good. Any tips would be appreciated.
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