11 31 052 Replacing both timing chains (N47 D20 O1)

Special tools required:

Necessary preliminary tasks:

Remove ENGINE .
Mount engine on assembly stand. See 11 00 MOUNTING ENGINE ON ASSEMBLY STAND (N47 D20 O1) .
Remove CYLINDER HEAD .
Removing OIL SUMP .
Remove GEAR CASE .
Remove OIL/VACUUM PUMP .

Remove timing chain for the cylinder head.

Remove tensioning rail (1) from cylinder head.

NOTE: Bearing journal (2) does not have to be removed.

Fig 1: Identifying Tensioning Rail And Bearing Pin

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The crankshaft must be blocked in order to release central bolt (1) of the high pressure pump.

Position special tool 11 4 320 with screw (2) at the crankcase.

Release central bolt (1) of high pressure pump.

IMPORTANT: Release central bolt only, do not remove.

Fig 2: Positioning Special Tool (11 4 320) With Screw On Crankcase

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Screw special tool 11 8 740 into sprocket of high pressure pump.

Undo the central bolt (1) of the high pressure pump until the central bolt can rest on the special tool 11 8 740 .

Keep turning the central bolt (1) until the sprocket has come loose from the high pressure pump shaft.

Fig 3: Identifying High Pressure Pump Central Bolt On Special Tool (11 8 740)

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Press chain tensioner in with tensioning rail (1) by hand in the direction of the arrow until the special tool 11 4 120 can be positioned.

Remove chain tensioner.

Fig 4: Pressing Chain Tensioner In Tensioning Rail

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Undo both bearing journals (1).

Remove guide rail (2).

Release bearing journal (4).

Remove tensioning rail (3).

Fig 5: Identifying Guide Rail, Bearing Journal And Tensioning Rail

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Release screw (1).

Remove special tool 11 4 320 .

Fig 6: Identifying Special Tool (11 4 320)

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Remove impeller (1) with timing chain (2) from high pressure pump and crankshaft.

Remove timing chain (2).

Fig 7: Identifying Timing Chain & Impeller

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

Fit timing chain (1).

Position crankshaft with special tool 2 285 671 (crankshaft is in the 11° top dead center).

Fix special tool 2 285 671 via the fitting bush on the crankcase.

Fig 8: Fitting Timing Chain

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Installation note:

To check the 11° after top dead center.

Pistons on cylinders 1 and 4 must be approx. 0.5 to 1 mm below the contact surface.

Fig 9: Measuring Short Length On Cylinder 1 Using Caliper Gauge

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Installation note:

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

Fig 10: Identifying Spline Groove On High Pressure Pump

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Installation note:

The marking on crankcase and groove on the high pressure pump must be in line (graphic N57).

Fig 11: Identifying Crankcase Mark On High Pressure Pump

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Installation note:

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

Fig 12: Identifying Groove Mark On Pinion

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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 13: Identifying Timing Chain And Impeller Mark

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Insert central bolt (1) of high pressure pump.

Fig 14: Identifying Central Bolt Of High Pressure Pump

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IMPORTANT: Clean all the threads of the bearing journals (if necessary with screw tap).

Position slide rail (1).

Screw in bearing journals (2).

Tightening torque: 11 11 3AZ .

Fig 15: Identifying Slide Rail And Bearing Journals Screw

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IMPORTANT: Clean all the threads of the bearing journals (if necessary with screw tap).

Position guide rail (1).

Screw in bearing journals (2).

Tightening torque: 11 11 3AZ .

Position tensioning rail (3).

Screw in bearing journals (4).

Fig 16: Identifying Guide Rail, Bearing Journal And Tensioning Rail

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The crankshaft must be blocked in order to secure the central bolt of the high pressure pump.

Remove special tool 11 3 340 on the chain tensioner.

Position special tool 2 285 671 on the crankcase.

Secure central bolt of high pressure pump.

Tightening torque: 13 52 2AZ .

Fig 17: Securing Central Bolt Of High Pressure Pump

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Position tensioning rail (1) with timing chain for cylinder head.

Fig 18: 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 19: Mounting Flats On Oil Pump Shaft

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IMPORTANT: Left-hand threads.

Insert screw (1).

Tightening torque: 11 41 3AZ .

Fig 20: Identifying Camshaft Sprocket And Screw

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Installation note:

Check fitting sleeves for damage.

Apply SEALING COMPOUND 2.2 along the housing (1) with a thickness of approx. 1.5 to 2 mm.

Fig 21: Identifying Sealing Compound Housing Applying Area

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Mount GEAR CASE COVER .

Mount OIL SUMP with special tool 11 8 780 .

Fig 22: Identifying Screws Of Oil Sump

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Installation note:

Flywheel must be installed to determined TDC.

Position flywheel.

Secure FLYWHEEL with special tool 11 9 260 .

Secure flywheel studs with special tool 11 4 180 .

Fig 23: Securing Flywheel Studs With Special Tool (11 4 180)

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Turn flywheel (1) back.

Block crankshaft with special tool 11 5 320 in TDC firing position for cylinder 1.

Fig 24: Turning Flywheel

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Assemble engine.