How to remove and install the differential seal and pinion flange on the BMW 325i?

This procedure applies to both the front (AWD models) and rear differential. Removal: Remove the driveshaft and the exhaust system. Remove the retaining plate and make alignment marks between the driveshaft flange nut, the differential pinion flange, and pinion. Discard the retaining plate; a new one must be used during installation. Hold the differential pinion flange stationary by bolting a length of metal bar to it. Unscrew the nut, noting the exact number of turns necessary to remove it. Using a suitable puller, draw the differential pinion flange from the pinion and remove the dust cover. If the dust cover shows signs of wear, replace it. Pry the oil seal from the differential case with a screwdriver. Wipe the oil-seal seating surface clean. Installation: Smear a little differential oil on the sealing lip of the new oil seal, then press it squarely into the differential case until it is flush with the outer face. If necessary, tap the seal into position using a metal tube that only bears on its hard outer edge. Install the dust cover and place the differential pinion flange on the pinion, aligning the marks made during removal. Replace the flange nut, screwing it on by the exact number of turns counted during removal, so that all alignment marks align. Caution: Do not overtighten the flange nut. If the nut is overtightened, the collapsible spacer behind the flange will be deformed, requiring its replacement. This is a complex operation that requires the rear differential to be disassembled. Secure the nut in position with the new retaining plate, tapping it squarely into position.

Genuine BMW 325i Differential Seal

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7 Differential Seals found

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BMW 325i Shaft Seal
Part Number: 31507609535
$14.45 MSRP: $18.20
You Save: $3.75 (21%)
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Product Specifications
- Replaces: 33-10-1-214-099, 33-12-1-203-811, 33-12-1-212-461
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2001-2006 BMW 325i | Sedan M54 Engine(E46), Sedan M56 Engine(E46), Sedan(E46), Sedan(E90), Wagon M54 Engine(E46), Wagon M56 Engine(E46), Wagon(E46)
- 1987-1995 BMW 325i | Convertible(E30), Convertible(E36), Coupe(E30), Sedan(E30), Sedan(E36)
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BMW 325i Shaft Seal With Lock Ring
Part Number: 33107505604
$14.45 MSRP: $18.20
You Save: $3.75 (21%)
Ships in 1-3 Business Days
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Product Specifications
- Replaces: 33-13-1-214-322
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2001-2006 BMW 325i | Sedan M54 Engine(E46), Sedan M56 Engine(E46), Sedan(E46), Sedan(E90), Wagon M54 Engine(E46), Wagon M56 Engine(E46), Wagon(E46)
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BMW 325i Shaft Seal With Lock Ring
Part Number: 33107505602
$17.11 MSRP: $18.65
You Save: $1.54 (9%)
Ships in 1-3 Business Days
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Product Specifications
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 1987-1995 BMW 325i | Convertible(E30), Convertible(E36), Coupe(E30), Sedan(E30), Sedan(E36)
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BMW 325i Gasket Set Differential
Part Number: 33101210518
$129.63 MSRP: $148.70
You Save: $19.07 (13%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Gasket Kit
- Replaces: 33-10-1-210-046
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 1987-1992 BMW 325i | Convertible(E30), Coupe(E30), Sedan(E30)
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BMW 325i Shaft Seal
Part Number: 33101214099
$14.45 MSRP: $18.20
You Save: $3.75 (21%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Replaced by: 31507609535
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 1987-1995 BMW 325i | Convertible(E30), Convertible(E36), Coupe(E30), Sedan(E30), Sedan(E36)
View related parts
BMW 325i Gasket Set Differential
Part Number: 33101211823
$129.63 MSRP: $148.70
You Save: $19.07 (13%)
Product Specifications
- Other Name: Gasket Kit
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 1992-1995 BMW 325i | Convertible(E36), Sedan(E36)
View related parts
BMW 325i Gasket Set Differential
Part Number: 33107530427
Product Specifications
- Other Name: Gasket Kit
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2006 BMW 325i | Sedan(E90)

BMW 325i Differential Seal

The BMW 325i Differential Seal keeps the differential oil in and the grit out. It protects your smooth cornering and extends the life of your gears. Mounted around pinion and axle flanges on both open and limited slip units applied in many BMW 325i cars, each Differential Seal uses heat-resistant synthetic rubber to create a tight, leak-proof barrier. If there is a leak of lubricant, the gears run hot. A tight Differential Seal will maintain the fine balance between both left and right wheels, allowing them to spin at different speeds when turning. While an open diff divides torque evenly, the LSD sends more power to the tire that has grip. The same style Differential Seal serves both layouts, but the variation is mostly in diameter to suit their housings. Various compounds, such as nitrile or fluoroelastomer, allow the Differential Seal to shrug off pressure, heat, and moisture. However, it has to rest flush on a smooth shaft lip and be periodically checked about every 3,000 miles. Drivers of the rear-drive 325i are advised to listen closely for clunks or rattles that indicate the need to replace a worn seal, as it is much cheaper to replace this small part than to replace the entire differential. This is a fact BMW has shown by sticking with the idea year after year.

If you are looking for OEM BMW 325i Differential Seal, we highly recommend to shop with us. Not only do we offer budget friendly prices, but we also provide fast delivery. In addition, we have a hassle-free return policy on all genuine BMW 325i Differential Seal that come backed by the manufacturer's warranty.

BMW 325i Differential Seal Parts Questions & Experts Answers

Shaft Seal
31507609535
Q:
How to remove and install the differential seal and pinion flange on the BMW 325i?
Posted by Zhiheng L.
A:
This procedure applies to both the front (AWD models) and rear differential. Removal: Remove the driveshaft and the exhaust system. Remove the retaining plate and make alignment marks between the driveshaft flange nut, the differential pinion flange, and pinion. Discard the retaining plate; a new one must be used during installation. Hold the differential pinion flange stationary by bolting a length of metal bar to it. Unscrew the nut, noting the exact number of turns necessary to remove it. Using a suitable puller, draw the differential pinion flange from the pinion and remove the dust cover. If the dust cover shows signs of wear, replace it. Pry the oil seal from the differential case with a screwdriver. Wipe the oil-seal seating surface clean. Installation: Smear a little differential oil on the sealing lip of the new oil seal, then press it squarely into the differential case until it is flush with the outer face. If necessary, tap the seal into position using a metal tube that only bears on its hard outer edge. Install the dust cover and place the differential pinion flange on the pinion, aligning the marks made during removal. Replace the flange nut, screwing it on by the exact number of turns counted during removal, so that all alignment marks align. Caution: Do not overtighten the flange nut. If the nut is overtightened, the collapsible spacer behind the flange will be deformed, requiring its replacement. This is a complex operation that requires the rear differential to be disassembled. Secure the nut in position with the new retaining plate, tapping it squarely into position.
Answered by BMW Parts Specialist Noah / Dec 31, 2025