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

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ENGINE 642

CRANKCASE, TIMING CASE COVER, END COVER

Number	Designation			Engine 642
BA01.40-P-1001-01S	Bolt connecting rear end cover to crankcase	Stage 1	Nm	8
BA01.40-P-1001-01S	Bolt connecting rear end cover to crankcase	Stage 2	Nm	10

Fig 1: Identifying Insertion Tool (271 589 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 lips of radial shaft sealing ring (1) must not be touched.

When using the insertion tool always ensure that sealing lip (1d) of radial sealing ring (1) is correctly aligned.

The radial sealing ring (1) and contact surface (3a) on crankshaft flange (3) must not have any oil and grease on them.

Fig 2: Radial Shaft Sealing Ring And Crankshaft Flange

Courtesy of MERCEDES-BENZ USA

Clean and degrease crankcase (4) in area of sealant application as well contact surface (3a) on crankshaft flange (3).
The contact surface (3a) must not be cleaned using abrasive paper since this would damage the surface of the crankshaft.

If manual transmission fitted
Clean and degrease sealing surface of new end cover (2).
Apply sealant in the form of a bead with a diameter of around 2.0 mm on end cover (2) .
Only use approved sealants. Do not spread bead (A). Mount end cover (2) within 5 minutes after applying sealant.

Fig 3: Sealant Application On End Cover
Courtesy of MERCEDES-BENZ USA

If automatic transmission fitted
Clean and degrease sealing surface of new end cover (2).
Apply sealant in the form of a bead with a diameter of around 2.0 mm on crankcase (4) and oil pan.
Only use approved sealants. Do not spread bead (A). Mount end cover (2) within 5 minutes after applying sealant.

Fig 4: Sealant Application On Crankcase And Oil Pan
Courtesy of MERCEDES-BENZ USA
Fit insertion tool (271 ) and insertion tool (271a) together.
Upon subsequent assembly, the conical form of the insertion tool ( 271a) presses the lip (1d) into the correct direction.
Slide end cover (2) with radial sealing ring (1) on insertion tool (271) fitted together.
Ensure that the lip (1d) points towards the output side, that is towards the engine.
Detach insertion tool (271a) from insertion tool (271).

Fig 5: End Cover, Radial Sealing Ring And Insertion Tool
Courtesy of MERCEDES-BENZ USA

Fig 6: Radial Shaft Sealing Ring, Protective Lip And Crankshaft Flange
Courtesy of MERCEDES-BENZ USA
Insert insertion tool (271) with preassembled end cover (2) or radial sealing ring (1) into crankshaft flange (3).
Slide end cover (2) with radial sealing ring (1) carefully onto contact surface (3a) of the crankshaft flange (3).
While doing this, check the correct installation position of the lip (1d).

A wrong installation position leads to leakage.

The lip (1d) must point towards the crankcase (4) all around its circumference.
Detach insertion tool (271) from crankshaft flange (3).
Check for correct installation position of the protective lip (1s).
Incorrect installation position leads to premature wear of the radial shaft sealing ring (1).

The protective lip (1s) must point towards transmission housing around its entire circumference.
Tighten bolts (2a) gradually diagonally.