Installing rear crankshaft radial sealing ring - AR03.20-P-3063-01MMA

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ENGINE 276

MODIFICATION NOTES

16.3.11

Special tool 271 589 00 43 00 replaced by special tool 273 589 00 43 00

CRANKCASE, TIMING CASE COVER, END COVER

Number	Designation		Engine 276
BA01.40-P-1002-01K	Bolt, rear end cover to crankcase	Nm	9

OIL PAN

Number	Designation			Engine 276
BA01.45-P-1001-01E	Bolt, oil pan to cylinder crankcase/timing case cover/rear end cover	M6	Nm	9

Fig 1: Identifying Insertion Tool (273 589 00 43 00)

Courtesy of MERCEDES-BENZ USA

REPAIR MATERIALS

Number	Designation	Order number
BR00.45-Z-1013-01A	Loctite 5970 sealant	A 003 989 98 20
BR00.45-Z-1028-04A	Cleaner from package	Adolf Wurth GmbH & Co. KG
BR00.45-Z-1038-04A	Loctite 7200	Henkel Loctite Deutschland GmbH

The crankshaft radial sealing ring (1) is vulcanized into the end cover (2) and can only, therefore, be replaced together with the end cover (2). Do not reuse the end cover (2) with the rear crankshaft radial sealing ring (1) after removal.

The crankshaft radial sealing ring (1) has a protective lip (1s) in addition to the sealing lip (1d). The sealing lip (1d), protective lip (1s) and contact surface (3a) at the crankshaft flange (3) must not be lubricated for assembly!

Fig 2: Crankshaft Flange Contact Surface And End Cover Sealing Surface

Courtesy of MERCEDES-BENZ USA

Clean and degrease crankcase (4) and oil pan in the area of the applied sealant as well as contact surface (3a) on the crankshaft flange (3).
Clean and degrease sealing surface of new end cover (2).
Apply sealant in the form of a bead with a height and width of 2.0 mm (± 0.5 mm) to the crankcase (4) and oil pan.
Use exclusively approved sealants. Do not spread bead. Mount end cover (2) within 5 minutes after applying sealant.

Fig 3: Sealant Application To Crankcase And Oil Pan
Courtesy of MERCEDES-BENZ USA
Mount end cover (2) with crankshaft radial sealing ring (1) on insertion tool (6).
Make sure that protective lip (1s) faces towards the side applying the force and sealing lip (1d) faces in the direction of the crankcase (4). Leakage could occur otherwise at rear crankshaft radial sealing ring (1).

The crankshaft radial sealing ring (1) can only be mounted on the insertion tool (6), if insertion tool (6) is fitted together with insertion tool (7).

Fig 4: Sealing Lip & Insertion Tools
Courtesy of MERCEDES-BENZ USA
Separate insertion tool (7) from insertion tool (6).
Mount end cover (2) with crankshaft radial shaft sealing ring (1) and insertion tool (6) onto contact surface (3a) on crankshaft flange (3).
The contact surface (3a) must not be removed with emery board as this can destroy the surface of the crankshaft and render the crankshaft unusable.

Fig 5: Insertion Tool Contact Surface On Crankshaft Flange
Courtesy of MERCEDES-BENZ USA

Fig 6: Checking Protective Lip For Correct Installation Position
Courtesy of MERCEDES-BENZ USA
Tighten bolts (2a) gradually in crosswise pattern, then tighten the bolts (2b). Observe tightening torque.
Detach insertion tool (6) from crankshaft flange (3).
Carefully lift protective lip (1s) and check the correct installation position of sealing lip (1d).
A wrong installation position leads to leakage.

The sealing lip (1d) must point towards crankcase (4) all around its circumference.
Check for correct installation position of the protective lip (1s).
An incorrect installation position leads to premature wear of crankshaft radial sealing ring (1).

The protective lip (1s) must point towards transmission housing around its entire circumference.