I love to know of everything about 530 emgine swap. I've got a 2004 325i I'm prepping for a 2002 530i drop in, and I'm unsure of what all I need.
BMkeinewerke
It is a direct swap, they are the same M54 engine. Only differences are airbox and possiblly oil pan.
Use realoem.com to check parts cross compatibility.
Use realoem.com to check parts cross compatibility.
The wiring harness differs as well.
The parts are easy to swap once the engines are side-by-side. You'll want a fresh oil pan gasket anyway, and that will give you the opportunity to clean the debris from the oil intake screen.
While the engine is out, it is quite easy to change the OFHG, coolant pipes under the intake, and the CCV system.
I suggest not changing the oil filter until after you test a few minutes or hours with the cheapest 10W30 - 15W40 oil. Once you are certain that everything is sealed and operating normally do an oil and filter change.
The parts are easy to swap once the engines are side-by-side. You'll want a fresh oil pan gasket anyway, and that will give you the opportunity to clean the debris from the oil intake screen.
While the engine is out, it is quite easy to change the OFHG, coolant pipes under the intake, and the CCV system.
I suggest not changing the oil filter until after you test a few minutes or hours with the cheapest 10W30 - 15W40 oil. Once you are certain that everything is sealed and operating normally do an oil and filter change.
E39 M54 oil pan is a little bit different but fits in E46 anyway. What does not fit is oil level sensor connector - E46 has a key different to E39 connector. But E46 oil level sensor fits in E39 oil pan anyway, so problem solved. Head/coolant temperature sensor may have different connector, but that differs by year, not by car model. The threaded hole in the head is the same, so simply swap the sensor.
You need E46 engine harness, all 3 parts, because E46 has ECU compartment at opposite side to E39, so cable length is different.
Of course engine mounts are different.
But you can take all these things from your 2.5L engine. It's all same except the 3.0 airbox has larger opening for bigger MAF.
If you have manual gearbox, you need clutch disc with spline count matching your gearbox shaft. 2004 2.5L is likely to have 22 splines. No idea if 2002 3.0 still has 10 splines. You may want to replace clutch anyway if the old one is half way worn out.
If you have auto gearbox, you need entire different gearbox as 3.0 has more friction discs in some clutch packs and also different TC.
If you want to swap entire engine-gearbox combo, you need shorter driveshaft, different shift linkage and gearbox support/mount for manual ZF 320z gearbox. You can't use those from E39 as these are much longer.
You need E46 engine harness, all 3 parts, because E46 has ECU compartment at opposite side to E39, so cable length is different.
Of course engine mounts are different.
But you can take all these things from your 2.5L engine. It's all same except the 3.0 airbox has larger opening for bigger MAF.
If you have manual gearbox, you need clutch disc with spline count matching your gearbox shaft. 2004 2.5L is likely to have 22 splines. No idea if 2002 3.0 still has 10 splines. You may want to replace clutch anyway if the old one is half way worn out.
If you have auto gearbox, you need entire different gearbox as 3.0 has more friction discs in some clutch packs and also different TC.
If you want to swap entire engine-gearbox combo, you need shorter driveshaft, different shift linkage and gearbox support/mount for manual ZF 320z gearbox. You can't use those from E39 as these are much longer.
The M54 engines for E39 and E46 are the same, it is the peripheral parts that are different. All of those can easily be swapped over.
yeah, oddly, the 3.0 parts are mostly larger than the 325- even the schnorkle.
www.realoem.com and open 2 windows for a 325 and 330.
But IIRC, the LOWER part of the filter housing's the same (check me on this!)
From the 530, you can use everything from the throttle body through the exhaust manifolds.
DO use the 325 engine harness, coil harness, and 530 injectors.
Then the 325 parts ought to fit after that. Yeah, there's a flap, but that jus' don' matter!
t
...even though we'd like to?
But seriously, folks, lots of the x3 parts (like the oil pan) are part number compatible for the 3 series xi cars,
and many of them (like the 6- speed transmission) can be pretty easily adapted.
I have yet to use x5 parts- and would consider them last, as the 3L engine was working really hard
to get that pig moving.
t
But seriously, folks, lots of the x3 parts (like the oil pan) are part number compatible for the 3 series xi cars,
and many of them (like the 6- speed transmission) can be pretty easily adapted.
I have yet to use x5 parts- and would consider them last, as the 3L engine was working really hard
to get that pig moving.
t
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