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E46 Xi Forum
The E46 XI was produced from 01-05 in sedan and touring body styles. Powered by either a 2.5L inline 6 in the 325xi or a 3.0L inline 6 330xi. Discuss all thing about BMW AWD E46 'Xi' here.

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Old 07-15-2019, 09:47 AM   #1
wfx32
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Location: VA USA
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My Ride: AWD
Model: 330XI 08/2004
Transmission: auto
oil pan leak at front diff?

hello i need some advice on how to tackle this oil leak (pic). it seems to be coming from between the oil pan and the front diff.. thinking i should replace the o-ring?

real oem > Front Axle > Final drive (front axle) > Front diff., components, all-wheel (31_0568)

newtis / Repair Manuals / 31 Front axle, front suspension / 31 00 Front axle in general / Overview of front differential/output shafts

Last edited by wfx32; 07-15-2019 at 09:53 AM.
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Old 07-15-2019, 11:04 AM   #2
77'911
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Since you have to pull the front axles to do an oil pan gasket, I'd replace:
1) the 2 o-rings on each side
2) axle input shaft seals
3) check condition of support bearing
4) check condition of front axles
5) check motor mounts (you don't want too much movement up there)
6) check condition of front wheel bearings(easy to change out with axles removed)
Regards
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Old 07-15-2019, 11:15 AM   #3
wfx32
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Model: 330XI 08/2004
Transmission: auto
Quote:
Originally Posted by 77'911 View Post
Since you have to pull the front axles to do an oil pan gasket, I'd replace:
1) the 2 o-rings on each side
2) axle input shaft seals
3) check condition of support bearing
4) check condition of front axles
5) check motor mounts (you don't want too much movement up there)
6) check condition of front wheel bearings(easy to change out with axles removed)
Regards

thanks .. replaced oil pan gasket and engine mounts last year. i guess neither mechanic looked at the o-rings and seals or i wouldn’t have this leak.

front axles and wheel bearings seem ok but i will check again.

driveshaft center support bearing was already on my list because someone here said it had to be replaced before 150k.
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Old 07-15-2019, 11:21 AM   #4
77'911
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I'd check to see if it's not the oil pan gasket. Many people screw it up by not following the factory install procedure (tighten torque sequence). The bearing I mean was the one in the support for the passenger side front axle. Any BMW I pick up, automatically gets drive line mounts, center support bearing assembly, guibo, and exhaust mounts. This, usually gets rid of a load of issues.
regards
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Old 07-15-2019, 01:43 PM   #5
wfx32
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My Ride: AWD
Model: 330XI 08/2004
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Quote:
Originally Posted by 77'911 View Post
The bearing I mean was the one in the support for the passenger side front axle.
ok i think you mean this supporting bracket (31537500850).

Quote:
Originally Posted by 77'911 View Post
Any BMW I pick up, automatically gets drive line mounts, center support bearing assembly, guibo, and exhaust mounts. This, usually gets rid of a load of issues.
regards
on the steptronic auto i guess these are the transmission bearing (22316773125), drive shaft center mount (26121229317), universal joint (26111229360), exhaust support (18301436331) .. let me know if i didn't get those right

Last edited by wfx32; 07-15-2019 at 01:44 PM.
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Old 07-16-2019, 12:03 PM   #6
77'911
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Quote:
Originally Posted by wfx32 View Post
ok i think you mean this supporting bracket (31537500850).



on the steptronic auto i guess these are the transmission bearing (22316773125), drive shaft center mount (26121229317), universal joint (26111229360), exhaust support (18301436331) .. let me know if i didn't get those right
Yep those are about right. Before ordering stuff for the driveshaft, you want to check the condition of the joints in the back. It might be bad enough, were it warrants a reman driveshaft (which usually comes with all the ancillaries).
The exhaust stuff I was talking about were the rubber components(IE #4 in diagram, joint sleeve, 18207546579, etc..). You'll want to see what condition the brackets and hardware are in. Most of the time, at this age/mileage, they will warrant a complete unit, depending.
regards
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