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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E39 (1997 - 2003)

E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 10-06-2015, 06:19 AM
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goosefoot33 goosefoot33 is offline
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Location: Hudson, MA
 
Join Date: Mar 2008
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Mein Auto: 01 330Ci/02 525iT
M54B25 Engine Replacement

I am considering installing a used M54B25 in my 525iT, to replace the current one that is in there. After replacing numerous parts and spending countless hours chasing the cause of my sporadic P1347 code (misfire on cylinder 3 with fuel cutoff), I am assuming that it is an internal engine issue at this point. I have another thread going about all the parts I've replaced, which include: spark plugs, coils, injectors, DISA, cleaned ICV, rebuilt ECU, vacuum lines, intake elbows, O2 sensors, etc, etc, etc.
So I believe the time has come for a replacement engine. I've sourced a few for $300 with about 150K on them. They're from totaled cars with either rear or side damage, so I'm confident that the cars weren't totaled due to the engine being overheated. The swap seems fairly straightforward, but I have a few questions...

Will I need to re-flash my ECU?
I just replaced my clutch - any tricks or precautions on removing and re-installing? Is it a simple procedure of unbolting it and bolting it back up to the "new" engine?
My 2002 525iT is a manual- do I need an engine from a manual car? Will an engine from a 2001 or 2002 325i or 325xi be the exact same?

I'm assuming that this should be as simple as taking my old engine out with all the accessories on it (P/S pump, A/C, etc.), swapping them over to the "new" engine, and re-installing without any software or fitment issues?
I'm very familiar with the M54s, but just want to confirm these details.
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  #2  
Old 10-06-2015, 06:25 AM
Barracuz Barracuz is offline
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Location: Providence, R.I.
 
Join Date: Apr 2015
Posts: 602
Mein Auto: 2001 525i 5 spd
Any m54b25 will drop in.

You shouldn't need to mess with the ecu since all you'll be doing is dropping the engine in. But don't follow me on that.

Only problem I see is the clutch. Since the stock clutch setup uses up some "spring" set up of some. Sort unless you went a luks replacement clutch?
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  #3  
Old 10-06-2015, 06:33 AM
poolman poolman is offline
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Location: martinsville va
 
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Mein Auto: 525i station wagon
If you use another 525 M54 engine, the only thing you would need to do is use your throttle body. If you use the TB off of the newer engine you will have to do some software work. You could also drop in a 3 litre M54 engine and then just have your OBC reflashed and that would work and give you extra HP and Fuel mileage. Wish I had gone that route instead of using another M54 525 engine in my car when I replaced my engine. Good Luck to you.
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  #4  
Old 10-06-2015, 07:27 AM
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goosefoot33 goosefoot33 is offline
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Location: Hudson, MA
 
Join Date: Mar 2008
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Mein Auto: 01 330Ci/02 525iT
I was nervous about the clutch, as it's a self-adjusting one from Sachs and I hear is tricky to remove and re-install.

Are the throttle bodies different on a 525 vs a 325? I was considering replacing my 2.5L with the 3.0L, but I don't really want to mess around with that. I've heard some stories where a simple ECU re-flash didn't take, and it wasn't right from the start.
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(Summer) 2001 330Ci - ZSP
(Winter) 1994 530i "Greenie" - PARTING OUT! (PM for details)

(Grocery Getter) 2002 525iT
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  #5  
Old 10-06-2015, 11:26 AM
poolman poolman is offline
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Mein Auto: 525i station wagon
Same throttle body on both cars,,the only thing to note is, that they are coded to each car and will need some sort of work in the computer set up to get the different TB recognised. On dropping in the 3.0 engine ,,the flash is no big deal and if you have someone who knows what they are doing, it's a snap.
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