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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > DIY Guides > DIY - N54, 335i Serpentine Belt, Tensioner, Upper and Lower Pulley Replacement



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      11-20-2017, 05:27 PM   #67
BashShah
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Quote:
Originally Posted by SoILBMW View Post
The fan and shroud are two pieces, however it has to be removed to separate them.

The intercooler was very easy to remove 2 torx screws and 2 line clips and it dropped right out.

That gave me the clearance it needed, and it lifted right out after that.

Thanks!
OK, now there is something I didn't know.
did I ever tell you that I am a Realtor......lol
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      06-10-2018, 11:53 PM   #68
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Thanks for the DIY. I gave myself a few issues when doing this. I saw in the pictures that you had the coolant hose disconnected from the Oil Filter Housing so I did so(not necessary for this job), i had to drain coolant anyway but i didn't expect all that coolant to be in the upper part of the system so i made a huge mess. Popping out my expansion tank lines from the fan shroud clips I discovered that my lines were completely brittle and trash, they broke in 3 places upon removal. Including the bung breaking off the upper rad hose so the line wouldn't even sit on it anymore. Had to order those two things. Dropped my intercooler to get to my drain bolt to find it was stripped. While down there I noticed my trans cooler return hose was leaking. Remove the skid plate and the shroud fan guys its impossible if you dont. Even squeezing my ratchet between the air duct and the two pulley was a massive pain but can be done.

I need help finding this part please guys. It's circled. I'm looking for just that hose. It's leaking on the connector at the atf cooler end. I can find the part number for the connector but i'm not sure that would do it. This part does not go directly into the rad it's next to the t25 that goes in the fan shroud assembly. Please help, had to next day parts from FCP Euro but I couldnt find this one!
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      06-11-2018, 11:27 AM   #69
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It's just a hose? Right?
If so, buy any hose, have shop pre shape it, and install with C clamps.

Plastic will become brittle in time.
I don't recall stating anywhere in the DIY to do disconnect any coolant lines.

I think part you are looking for Number 12 on this diagram.
I recommend call the dealer's part dept. and email the person you spoke to this picture and ask what part it is to be sure.

Good Luck

Last edited by BashShah; 06-11-2018 at 12:46 PM..
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      08-22-2018, 10:42 PM   #70
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Thank you
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      09-02-2018, 11:05 AM   #71
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Thank you for the DIY. I couldn't find a good one for the N55 but fortunately the engines are very similar in the front. Did this yesterday at 84k. The bulk of the work is getting the radiator fan out - even after you release the grommet/clip on the drivers side it feels like it is still connected.

Definitely replace the plastic drinking straw portion of the coolant vent hose when you're doing this. It's simple - 1/4" fuel line - 1 foot long, two hose clamps, two 1/4" barbed fittings for both ends of the hose that will replace the "straw"
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      09-03-2018, 07:28 AM   #72
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Quote:
Originally Posted by edl View Post
Thank you for the DIY. I couldn't find a good one for the N55 but fortunately the engines are very similar in the front. Did this yesterday at 84k. The bulk of the work is getting the radiator fan out - even after you release the grommet/clip on the drivers side it feels like it is still connected.

Definitely replace the plastic drinking straw portion of the coolant vent hose when you're doing this. It's simple - 1/4" fuel line - 1 foot long, two hose clamps, two 1/4" barbed fittings for both ends of the hose that will replace the "straw"
Post some pictures of the hoses and there placement. I now have a f30 with a n55 so going to be doing some work on it in 2 weeks time.
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      08-08-2019, 10:22 AM   #73
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      12-19-2019, 01:43 AM   #74
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How long does it take to do this?
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      12-21-2019, 12:12 AM   #75
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How long does it take to do this?
if you know your way around, 30 min or less.
newbie, 1 hour with proper tools.
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      12-23-2019, 01:16 AM   #76
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I took me 3 hrs to do this. The fan came out easy,but I had a hard time routing the belt. Not too bad. My car had 102k miles. Everything looked good just did it for preventative maintenance. This dyi helped a lot, thank you.
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      01-02-2020, 03:38 AM   #77
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Just did this on a N55 w/Oil Cooler, but I did not remove the fan.

It was a little tricky and I had to get creative. With 1/4 and 3/8 ratchets, socket extensions, 1/2 Breaker bar and "Jack Handle" Breaker bar.

Was able to use a Harbor Freight Pittsburgh 3/8 torque wrench with Neiko 10073A Torx Bits to torque everything to spec.

Routing the belt was pretty easy, starting with the crank pulley, left and right sides and leaving the alternator last, which mine slipped on without even touching the tensioner.

Tensioner wasn't bad easy to get from top.
Bottom pulley the torque wrench had like 1mm of space from the fan shroud to slip in, but it worked.
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      01-11-2020, 10:21 PM   #78
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Thanks a lot I was able to tackle this today without removing the radiator, it was easier since I do not have a factory oil cooler. I swapped it out at 137k which was really pushing it.
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