11 31 548 Checking timing chain for elongation and replacing both timing chains (N47D/D/C K/U/O/T 0/1)

Special tools required:

Necessary preliminary tasks:

CHECK TOP TIMING CHAIN .
Remove CYLINDER HEAD COVER .

The marking on exhaust sprocket wheel (A) must be aligned with the marking on intake sprocket wheel (E).

NOTE: See Fig 1.

Fig 1: Identifying Camshaft Sprocket Markings

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Installation note:

It is not permitted to turn the engine back, measured values are distorted.

Special tool 11 5 320 must be exactly in the alignment position.

Remove protective cap of gear case cover.

Turn engine with special tool 11 6 480 .

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

Fig 2: Identifying Special Tool (11 5 320)

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Place special tool 11 8 760 on exhaust camshaft.

Fig 3: Identifying Special Tool (11 8 760)

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Determine gap dimension.

Slide feeler gauge (1) between cylinder head and special tool 11 8 760 without jamming (see arrow).

Fig 4: Sliding Feeler Gauge Between Cylinder Head And Special Tool (11 8 760)

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Follow diagnosis instruction.

Necessary preliminary tasks:

Remove ENGINE .
Mount engine on assembly stand. See 11 00 MOUNTING ENGINE ON ASSEMBLY STAND (N47 D20 O1) .
Remove CYLINDER HEAD .
Remove OIL SUMP .
Remove GEAR CASE COVER .
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 5: 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 6: 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 7: Screwing Special Tool (11 8 740) Into Sprocket Of High Pressure Pump

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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 3 340 can be positioned.

Remove chain tensioner.

Fig 8: Pressing Chain Tensioner In with Tensioning Rail

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Undo both bearing journals (1).

Remove guide rail (2).

Release bearing journal (4).

Remove tensioning rail (3).

Fig 9: Identifying Guide Rail, Bearing Journal And Tensioning Rail

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Release screw (1).

Remove special tool 11 4 320 .

Fig 10: 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 11: Identifying Timing Chain & Impeller

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Installation note:

The check the 11° after top dead center.

Pistons (2) on cylinders 1 and 4 must be approx. 1 mm below the contact surface.

Using a caliper gauge (1), measure the short length on cylinder 1.

Fig 12: 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 13: 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 14: 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 15: 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 16: Identifying Timing Chain And Impeller Mark

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Insert central bolt (1) of high pressure pump.

Fig 17: 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 guide rail (2).

Screw in both bearing journals (1).

Tightening torque: 11 11 3AZ .

Position tensioning rail (3).

Screw in bearing journals (4).

Tightening torque: 11 11 3AZ .

Fig 18: Identifying Guide Rail, Bearing Journal And Tensioning Rail

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Screw in the central bolt (1) of the high pressure pump.

Position crankshaft on crankcase with special tool 11 4 320 .

Secure special tool 11 4 320 with screw (2) on the crankcase.

Secure central bolt (1) of high pressure pump.

Fig 19: Positioning Special Tool (11 4 320) With Screw On Crankcase

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Remove timing chain for the cylinder head.

Install tensioning rail (1) of cylinder head.

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

Fig 20: Identifying Tensioning Rail And Bearing Pin

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