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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 08-19-2019, 12:24 AM   #1
philfjord
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Join Date: Jul 2011
Location: Ventura Ca
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multiple trans failure after engine swap

Hi Guys
I know there are some sharp people here so I am posting a problem that I am having with an E39.
I installed a m52 engine from an e39 sedan from a manual transmission donor car. The driveshaft is tight. I have to pry it out.
The car is an E39 wagon . It has been through 2 transmissions since I put the engine in. Its been less than 10-15 k miles total .
Both have minimal damage internally, just some burned clutch packs.
Could it be related to the tight driveshaft? Or something to do with the fact that the engine started its life in a car with a manual trans?
Trans is a 5hp19
both failed transmissions were junkyard used units
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Old 08-22-2019, 07:23 AM   #2
Effduration
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What year is the wagon E39 ? Should it properly take an M52Tu engine (‘99 or ‘00) or even an M54 ‘01 or later?

More importantly, Did you remove the pilot bearing in the crank where the trans shaft inserts into?
The manual engine has a pilot bearing, the auto engine would not.

You will ruin an auto transmission if you install a engine with a pilot bearing in it.

Also, the engine and transmission should always go together smooth and flush like butter. If they don’t, or if you have to cinch them together using the bell-housing bolts something is wrong.

The other issue people have is that they install the auto trans with the torque converter NOT fully seated - it’s tricky to fully seat it- and this can cause the failure as well.
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Old 08-22-2019, 09:31 PM   #3
philfjord
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My Ride: 02 323 03 330i 00 ci
[QUOTE=Effduration;18613773]What year is the wagon E39 ? Should it properly take an M52Tu engine (99 or 00) or even an M54 01 or later?

More importantly, Did you remove the pilot bearing in the crank where the trans shaft inserts into?
The manual engine has a pilot bearing, the auto engine would not.

You will ruin an auto transmission if you install a engine with a pilot bearing in it.


I can't remember, I will check.
thanks.
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