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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > N54 Engine Replacement



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      10-31-2016, 05:47 PM   #1
Andrew@SupremePower
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N54 Engine Replacement

So we have a 2007 335i in for an engine replacement.

Cause: Smoking turbos burning lots of oil. Car was driven and after shutting it off indicated +1 Qt. No low oil light beforehand. Damage most likely occurred when there was low oil. Constant cylinder 3 misfires and low timing. Car was driven about a week and half after this incident. After a big misfire the car started smoking profusely and had to be towed to our shop.

Compression test showed cylinder 3 with no compression.


The replacement engine is from a 2010 135i We are also installing an 09+ 8-Bolt DMFW, 335is/550i Clutch, VRSF OEM Location Silicone Inlets, VRSF Charge Pipe, and brand new OEM Replacement Turbos.











ECU Harness disconnected








Engine Removed with Transmission. We used a Floor Jack to guide the transmission up and out of the Engine Bay.










Transmission Bell Housing unbolted from engine






Here is the original dual mass flywheel and the original clutch. 90k Miles on them. The clutch was slipping before the turbos started losing boost through the wastegates causing slow spool.


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      10-31-2016, 06:26 PM   #2
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Waiting on replacement engine to come in. Will update when it does. Should have this completed end of week.
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      10-31-2016, 07:14 PM   #3
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All that time and money and oem turbos. Either way good job.
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      10-31-2016, 07:54 PM   #4
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Any reason you pulled the motor out the front vs. dropping it on the subframe?
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      11-01-2016, 10:54 AM   #5
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Stupid question time; since you're doing a swap, I take it the A/C system will have to be evacuated/charged after installing the new motor. Given that you have to "open" the system, I'm assuming the condenser, drier, etc. are all refreshed as well?

Anything else you guys swap when a new motor goes in?
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      11-01-2016, 11:07 AM   #6
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Looks like it was heavily abused.
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      11-01-2016, 11:13 AM   #7
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Quote:
Originally Posted by mxchris727 View Post
Looks like it was heavily abused.
I agree. Just had my clutch replaced at about 100,000 miles while replacing the rear main and it looked like it could go for another 50,000 miles.

Good luck with the rest of the swap
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      11-01-2016, 12:25 PM   #8
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Quote:
Originally Posted by pits200 View Post
All that time and money and oem turbos. Either way good job.
I agree that this is an unfortunate decision. Although the engine failure wasnt expected after shortly swapping in new turbos.

Quote:
Originally Posted by DirtKurt View Post
Any reason you pulled the motor out the front vs. dropping it on the subframe?
Reason was to be able to move the car in and out while we wait for our engine replacement.

Quote:
Originally Posted by FCobra94 View Post
Stupid question time; since you're doing a swap, I take it the A/C system will have to be evacuated/charged after installing the new motor. Given that you have to "open" the system, I'm assuming the condenser, drier, etc. are all refreshed as well?

Anything else you guys swap when a new motor goes in?
We're replacing all seals and gaskets while the car is out. Anything that may be an issue down the line will be addressed.

Quote:
Originally Posted by mxchris727 View Post
Looks like it was heavily abused.
Clutch has been slipping for some time now. Customer wanted to address his failing turbos prior to clutch replacement

Quote:
Originally Posted by GottWhat View Post
I agree. Just had my clutch replaced at about 100,000 miles while replacing the rear main and it looked like it could go for another 50,000 miles.

Good luck with the rest of the swap
Looks like the previous owner probably abused the clutch. Current owner started having slipping issues after FBO installed
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      11-03-2016, 10:00 PM   #9
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Please update on any info found about turbocharger failure. Bad parts or botched install? thank you
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      11-04-2016, 05:12 AM   #10
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Hi Chris,a quick question since it looks like you've done this before,lol. I'm in the process of removing a n54 from a awd 535 and this is going in place of a n52. Is there and difference in the awd engine compared to the rwd? I want to use my current trans,and noticing there isn't much difference between the two. My car is a 07 525 and the donor car is a 08, late 07. Ty
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      11-04-2016, 05:16 AM   #11
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Andrew ,I'm sorry,lol called you Chris ,it's early.
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      11-04-2016, 05:21 AM   #12
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Quote:
Originally Posted by JuniorB View Post
Hi Chris,a quick question since it looks like you've done this before,lol. I'm in the process of removing a n54 from a awd 535 and this is going in place of a n52. Is there and difference in the awd engine compared to the rwd? I want to use my current trans,and noticing there isn't much difference between the two. My car is a 07 525 and the donor car is a 08, late 07. Ty
I think engines are fairly similar just need a new oil pan.
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      11-04-2016, 10:54 AM   #13
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It does look pretty straight forward,I wrench for a living,looking forward to this. I just need the software taking care of.ty 4 the reply
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      11-04-2016, 12:31 PM   #14
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Quote:
Originally Posted by luckyblack View Post
Please update on any info found about turbocharger failure. Bad parts or botched install? thank you
Turbocharger failure was due to mileage. Turbos held up fine, was just smoking. Engine failure was due to constant misfire on cylinder 3. Eventually taking a crap and blowing up lol

Quote:
Originally Posted by JuniorB View Post
Hi Chris,a quick question since it looks like you've done this before,lol. I'm in the process of removing a n54 from a awd 535 and this is going in place of a n52. Is there and difference in the awd engine compared to the rwd? I want to use my current trans,and noticing there isn't much difference between the two. My car is a 07 525 and the donor car is a 08, late 07. Ty
If youre replacing the n52 with a n54, it should be straight forward. You'll need more than just the motor. The transmission bellhousing is slightly different and you'll need the whole drivetrain. Along with fueling and DME

Quote:
Originally Posted by JuniorB View Post
It does look pretty straight forward,I wrench for a living,looking forward to this. I just need the software taking care of.ty 4 the reply
It is pretty straight forward. If you know how to remove and replace engines, you're more than capable. Coding isn't difficult. You'll only have to code the injectors
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      11-04-2016, 12:59 PM   #15
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Quote:
Originally Posted by Andrew@SupremePower View Post
It is pretty straight forward. If you know how to remove and replace engines, you're more than capable. Coding isn't difficult. You'll only have to code the injectors
Huh? Maybe I misunderstood, but I think he's replacing an N52 with an N54...I imagine that at least a few modules in the car will have to be recoded with the proper VO, no?
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      11-04-2016, 05:10 PM   #16
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Quote:
Originally Posted by FCobra94 View Post
Huh? Maybe I misunderstood, but I think he's replacing an N52 with an N54...I imagine that at least a few modules in the car will have to be recoded with the proper VO, no?
Ahh, I didn't realize the same person commented 3 times. Yes if N52 to N54, there will be a lot of coding involved.
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