11 31 052 Replacing both timing chains (N57 Diesel)

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Special tools required:

Necessary preliminary work:

Remove ENGINE .
Mount engine on ASSEMBLY STAND .
Remove CYLINDER HEAD .
Remove OIL SUMP .
Remove GEAR CASE .

Secure crankshaft with special tool 11 4 320 for bracing.

IMPORTANT: Left-hand threads.

Release central bolt (1).

Remove camshaft sprocket (2) with timing chain of oil pump.

Fig 1: Identifying Central Bolt And Camshaft Sprocket

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Lock chain tensioner (1) at bottom with special tool 11 3 340 .

Remove chain tensioner (1).

Fig 2: Identifying Chain Tensioner And Special Tool (11 3 340)

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Remove tensioning rail (1) from bearing pin (2).

Remove timing chain for the cylinder head.

(Picture shows N47).

Fig 3: Identifying Tensioning Rail And Bearing Pin

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Unfasten screws (2).

Remove slide rail (1).

Installation note:

Tightening torque: 11 11 3AZ .

(Picture shows N47).

Fig 4: Identifying Screws And Slide Rail

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Release screw (1).

Remove tensioning rail (2).

Fig 5: Identifying Tensioning Rail And Screw

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NOTE: To release high pressure pump central bolt (2), use special tool 11 4 320 to secure crankshaft from rotating.

Position special tool 11 4 320 and secure to crankcase with bolt (1).

Fig 6: Releasing High Pressure Pump Central Bolt

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Installation note:

Pay attention to dowel pin on crankshaft (1).

Secure special tool 11 4 320 to the crankcase with a screw M6.

Fig 7: Identifying Dowel Pin And Special Tool (11 4 320)

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Hand-tighten special tool 11 8 740 in secondary sprocket wheel of high-pressure pump.

Fig 8: Identifying Special Tool (11 8 740)

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Twist out central bolt (1) of high pressure pump in direction of arrow until impeller has detached from taper of high pressure pump.

Fig 9: Removing Central Bolt Of High Pressure Pump

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Remove special tool 11 8 740 .

Remove central bolt (1).

Remove special tool 11 4 320 .

Remove secondary sprocket wheel (2) with timing chain.

Fig 10: Identifying Central Bolt And Secondary Sprocket Wheel

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Installation note:

Pay attention to spline groove on high pressure pump (1).

Fig 11: Locating Spline Groove On High Pressure Pump

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Installation note:

Pay attention to lug for spline groove on camshaft sprocket (1) of high pressure pump.

Fig 12: Locating Lug For Spline Groove On Camshaft Sprocket

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Installation note:

Marking on crankcase (cast lug) and groove on high pressure pump must be in line.

Fig 13: Aligning Marking And Groove

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Installation note:

Groove and marking (0) on pinion are on a single plane.

Fig 14: Identifying Groove And Marking On Pinion

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Place timing chain with impeller (1) on crankshaft gear.

Fig 15: Identifying Timing Chain On Crankshaft Gear

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IMPORTANT: High pressure pump and crankshaft must be positioned towards each other.

Secure crankshaft (1) to crankcase at firing TDC, cylinder no. 1, with special tool 11 4 320 .

Fig 16: Identifying Dowel Pin And Special Tool (11 4 320)

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Position impeller (1) with timing chain (2) on high pressure pump.

Marking (0) and cast lug must be in line.

Fig 17: Aligning Marking And Cast Lug

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Secure special tool 11 4 320 with a M6x15 screw (1).

Screw in central bolt (2) of high pressure pump.

Fig 18: Releasing High Pressure Pump Central Bolt

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Secure central bolt (1) of high pressure pump.

Tightening torque: 13 52 1AZ .

Remove special tool 11 4 320 .

Fig 19: Identifying Central Bolt Of High Pressure Pump

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IMPORTANT: Clean all threads of bearing journals.

Position tensioning rail (2).

Screw in bearing journals (1).

Tightening torque: 11 11 3AZ .

Fig 20: Identifying Tensioning Rail And Screw

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IMPORTANT: Clean all threads of bearing journals.

Position guide rail (1).

Screw in bearing journals (2).

Tightening torque: 11 11 3AZ .

(Picture shows N47).

Fig 21: Identifying Screws And Slide Rail

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IMPORTANT: Clean sealing surfaces (1) with compressed air.

Fig 22: Identifying Sealing Surfaces

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Secure hydraulic chain tensioner (1) at bottom with two screws.

Tightening torque: 11 11 4AZ .

Remove special tool 11 3 340 .

Fig 23: Identifying Chain Tensioner And Special Tool (11 3 340)

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Position tensioning rail (1) for cylinder head.

Screw in bearing journals (2).

Tightening torque: 11 11 3AZ .

(Picture shows N47).

Fig 24: Identifying Tensioning Rail And Bearing Pin

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Position timing chain with secondary sprocket wheel for oil pump.

Installation note:

Pay attention to mounting flats on oil pump shaft (1) (see arrow).

Fit special tool 11 4 320 .

Fig 25: Identifying Mounting Flats On Oil Pump Shaft

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IMPORTANT: Left-hand threads.

Insert screw (1).

Tightening torque: 11 41 2AZ .

Remove special tool 11 4 320 .

Fig 26: Identifying Central Bolt And Camshaft Sprocket

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Installation note:

Check fitting sleeves (2) for damage.

Position beaded metal gasket (1).

Fig 27: Identifying Beaded Metal Gasket And Fitting Sleeves

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Installation note:

Flywheel must be installed to determined TDC.

Position flywheel.

Secure FLYWHEEL with special tool 11 9 260 .

(Picture shows automatic transmission).

Fig 28: Flywheel Bolts Tightening/Loosening Sequence (N57)

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Turn flywheel (1) back.

Use special tool 11 5 320 to block the crankshaft in the TDC firing position Cylinder 1

Fig 29: Locking Crankshaft In TDC Position Using Special Tool (11 5 320)

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Assemble engine.