11 21 505 Sealing crankcase lower section (N55)

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Special tools required:

IMPORTANT:

Aluminium-magnesium materials.

No steel screws/bolts may be used due to the threat of electrochemical corrosion.

A magnesium crankcase requires aluminium screws/bolts exclusively.

Aluminium screws/bolts must be replaced each time they are released .

Aluminium screws/bolts are permitted with and without color coding (blue).

For reliable identification:

Aluminium screws/bolts are not magnetic .

Risk of damage!

Jointing torque and angle of rotation must be observed without fail.

IMPORTANT: Changed procedure.
It is not necessary to remove the cylinder head and the crankshaft.

Necessary preliminary tasks:

Remove ENGINE .
Mount engine on ASSEMBLY STAND .
Remove ENGINE SUPPORT ARM on left and right.
Unscrew oil sump.

Release screws (1).

Pull out oil pump intake pipe (2).

Fig 1: Removing Oil Pump Intake Pipe

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Release screws (1).

Tightening torque: 11 13 5AZ .

Installation note:

Replace aluminium screws.

Remove oil deflector (2).

Fig 2: Identifying Oil Deflector And Screws

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Secure oil pump sprocket with 6.0 mm dia. steel pin (3) to oil pump.

IMPORTANT: Release central bolt (2) only together with 6.0 mm dia. steel pin (3).
Do not remove sprocket.

Release central bolt (2).

Tightening torque: 11 41 5AZ .

Fig 3: Identifying Crankcase Lower Section Steel Pin And Central Bolt

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Unfasten screws (2).

Tightening torque: 11 41 3AZ .

Installation note:

Replace aluminium screws.

Fig 4: Identifying Crankcase Lower Section Screws

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Remove screw plug (1) from crankcase at front.

NOTE: Replace gasket.

Fig 5: Identifying Crankcase Screw Plug

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Release screw (1) for oil pump triangular drive with special tool 11 8 640 .

NOTE: It is not necessary to remove the triangular drive.

Fig 6: Identifying Oil Pump Triangular Drive Screw

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Version 1:

Attention!

Observe different screw lengths.

Release screws (1).

Tightening torque 11 41 2AZ .

Installation note:

Replace aluminium screws.

Fig 7: Identifying Oil Pump Screws (Version 1)

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Version 2:

Attention!

Observe different screw lengths.

Release oil pump screws (1).

Tightening torque: 11 41 2AZ .

Installation note:

Replace aluminium screws.

Fig 8: Identifying Oil Pump Screws (Version 2)

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Detach sprocket (1) in direction of arrow.

NOTE: The chain tensioner pushes the timing chain (3) of the triangular drive upward.

Do not remove camshaft sprocket.

Remove oil pump (2) in direction of arrow.

Fig 9: Removing Oil Pump

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Installation note:

Check spacer bushings (1) for secure seating and damage; replace if necessary.

Align twin surface (3) on oil pump (2) to sprocket wheel.

Install oil pump (2).

Fig 10: Identifying Oil Pump, Twin Surface And Spacer Bushings

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NOTE: The special dowel hole for the TDC setting is located on the intake side underneath the starter motor.

Rotate engine at central bolt and secure flywheel in position with special tool 11 0 300 .

Fig 11: Sliding Special Tool (11 0 300) Into Dowel Hole

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Secure flywheel with special tool (1) 11 9 260 and special tool (2) 11 9 266.

NOTE: Make sure that the special tool (1) completely engages in the flywheel teeth (see arrow)

Fig 12: Securing Flywheel Using Special Tools (11 9 260) And (11 9 266)

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Automatic transmission:

Release flywheel bolts (1).

Release special tool (2).

Remove flywheel (3).

Fig 13: Removing Flywheel Bolts Using Special Tool

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Manual gearbox:

WARNING: Position crankshaft at TDC.

Remove dual-mass flywheel.

Secure flywheel with special tool 11 9 260 .

Remove VIBRATION DAMPER .

Release flywheel bolts with special tool 11 4 180 /

Fig 14: Locating Manual Gearbox Flywheel Bolts

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Fig 15: Identifying Crankcase Bolts Line

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Release all crankcase bolts (1) along line (2).

Fig 16: Identifying Crankcase Bolts Loosening Sequence (M10)

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Release crankcase bolts M10 in sequence 14 to 1.

Release crankcase lower section (1) from crankcase upper section (2) with suitable tool (3)

Remove crankcase lower section (1) upwards.

WARNING: Do not rotate crankshaft without crankcase lower section (1) (risk of damage) .

Fig 17: Removing Crankcase Lower And Upper Section Using Suitable Tool

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IMPORTANT:

Timing chain is preloaded.

Do not raise crankshaft.

Carefully remove radial shaft seal (1).

Catch escaping engine oil with a cloth (2).

Fig 18: Removing Radial Shaft Seal

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Carefully remove radial shaft seal (1) towards front.

Catch escaping engine oil with a cloth (2).

Fig 19: Catching Escaping Engine Oil Using Cloth

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WARNING: Protect crankcase against sealant residues with a cloth (1).

Fig 20: Protecting Crankcase Using Cloth

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Remove sealing compound residues (1) with special tool 11 4 470 .

Remove injector nozzles (2) for liquid sealing compound on left and right.

Installation note:

Replace injector nozzles (2).

Clean all threads with compressed air.

Fig 21: Identifying Injector Nozzle And Sealing Compound Residues

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Position crankcase lower section (1) on crankcase upper section.

Screw in all M10 crankcase bolts.

Joint all M10 crankcase bolts (1) 20 NM from inside outwards.

Fig 22: Securing Crankcase Lower Bolts

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Identify all M10 crankcase bolts with a colored marking (1) for checking.

Fig 23: Identifying Crankcase Bolts Colored Marking

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Fig 24: Identifying Crankcase Bolts Tightening Sequence (M10)

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Secure crankcase bolts M10 in sequence 1 to 14 with special tool 00 9 120 .

Tightening torque: 11 11 1AZ .

Fig 25: Identifying Crankcase Bolts Line

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Insert all crankcase bolts (1).

WARNING: Observe different lengths and sizes of the bolts.

Tightening torque: 11 11 2, 3 AND 4AZ .

Tighten screw (1) for oil pump triangular drive with special tool 11 8 640 .

NOTE: Replace screw.

Tightening torque: 11 41 4 AZ .

Fig 26: Identifying Oil Pump Triangular Drive Screw

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Tighten screw plug on front of crankcase.

Tightening torque: 11 11 9AZ

Installation note:

Replace sealing ring.

Fig 27: Identifying Crankcase Screw Plug

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Prepare radial shaft seal (1) on special tool 11 8 220 .

Fig 28: Identifying Radial Shaft Seal And Special Tool (11 8 220)

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Position radial shaft seal (1) with special tool 11 8 220 on the crankshaft.

Fig 29: Positioning Radial Shaft Seal On Crankshaft Using Special Tool (11 8 220)

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Brush radial shaft seal (1) over the special tool 11 8 220 .

Move radial shaft seal (1) parallel up against the crankcase.

Fig 30: Moving Radial Shaft Seal Parallel Up Against Crankcase

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Screw special tool 11 9 182 with screws (special tool 11 9 184 ) to crankshaft.

Fig 31: Identifying Special Tools (11 9 182) And (11 9 184)

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Installation note:

Prepare special tool 11 9 181 for installation. Connect special tool 11 9 185 onto special tool 11 9 181 .

Fig 32: Connecting Special Tools (11 9 185) And (11 8 181)

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Pull on radial shaft seal with special tool 11 9 181 and 11 9 185 in combination with special tool 11 9 183 .

Fig 33: Removing Radial Shaft Seal Using Special Tools (11 9 181) And (11 9 185)

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Screw on radial shaft seal with special tool 11 9 183 to limit position.

Fig 34: Installing Radial Shaft Seal Using Special Tool (11 9 183)

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Installation note:

Clean sealing surface (1) and degrease thoroughly in area of housing partition.

Apply a light coat of oil to tread (2) of radial seal.

NOTE: Illustration shows N42.

Fig 35: Identifying Crankshaft Sealing And Running Surface

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Push radial shaft seal (1) 11 9 235 carefully in direction of arrow on the special tool.

Fig 36: Pushing Radial Shaft Seal Using Special Tool (11 9 235)

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IMPORTANT: 11 9 235 Special tool can only be fastened with 2 opposite bolts.
Determine hole pattern on special tool.

Screw special tool 11 9 235 with special tool 11 9 234 on crankshaft.

Fig 37: Identifying Special Tools (11 9 234) And (11 9 235)

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Align groove (2) of radial shaft seal (1) centered to the housing partition (3.

WARNING: After installation, the grooves must be filled with sealing compound.

Fig 38: Identifying Radial Shaft Seal, Groove And Housing Partition

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Draw in radial shaft seal with special tool 11 9 231 in conjunction with special tool 11 9 233 until flush.

Fig 39: Identifying Special Tools (11 9 231) And (11 9 233)

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Drive both injector nozzles (1) on left and right with special tool 11 9 360 into crankcase up to stop.

Fig 40: Installing Crankcase Injector Nozzles Using Special Tool (11 9 360)

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After fitting both sealing rings, check both sealing ducts for clearance.

Blow compressed air (1) at max. 6 bar into injector nozzle (2).

Compressed air must emerge at both sealing rings on left and right from the outlet bores.

WARNING: If the compressed air does not flow out of all ducts. the crankcase must again be taken apart and cleaned.

Fig 41: Blowing Compressed Air Into Injector Nozzle

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Installation note:

Use PRIMER 1.3 AND LIQUID SEAL 1.4 .

Prepare liquid sealing compound (1) in special tool 11 4 370 .

Injector nozzles for injecting sealing compound are not required.

Take note of the expiry date!

Fig 42: Identifying Liquid Sealing Compound And Nozzle

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Slowly insert liquid sealing compound (1) with special tool 11 4 370 in direction of arrow.

Liquid sealing compound must emerge at radial shaft seals at front and rear.

Fig 43: Inserting Liquid Sealing Compound Using Special Tool (11 4 370)

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Stop (seal off) escaping liquid sealing compound with primer 1.3.

Fig 44: Sealing Crankcase Lower Section Liquid

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Stop (seal off) escaping liquid sealing compound with primer 1.3.

Fig 45: Coating Front Crankshaft Seal Using Primer

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Assemble engine.