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E46 Engine Swaps
Replacing your motor? From direct replacements to more exoctic engines, if it's going under the hood of an E46 3 Series this is the forum to discuss it.

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Old 01-07-2017, 01:16 PM   #1
Sean_Cassidy
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Join Date: Mar 2014
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My Ride: 325iT - DD
m54b30 from an e39 to e46 Engine Swap??

Hello all,

Came across an m54b30 with 139k miles out of an e39 (it's a 530i) for real cheap and am looking to swap it into my 2002 325iT which has 270k miles on it. I'm curious if anyone off the bat has any recommendations for doing this swap. I know that I'll need to flash the ECU, but my I'm mainly concerned about the wiring harness. The car this engine is being removed from has an automatic transmission - not sure if this matters.

Just looking for advice or any knowledge from anyone who has swapped motors form a 5 series to a 3 series.

Anything helps, thanks!
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Old 01-07-2017, 06:16 PM   #2
brewster240
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My Ride: 02 325it, 95 m3
i just did same swap.

change over oil pan. ad a pilot bearing to crank. replace seals and gaskets as needed.

the 325 harness goes right on it. you didnt mention what year e39. the 02 325 has square coils, the later engines have round coils. you can just swap your valve cover and coils on.
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miss my zhp :(
looking for e46 m3 with high miles/in need of work.
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