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Checking timing of camshafts - RA05001192150X(05-2150)

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Preceding work:

Cylinder head covers removed (01-0500) .

Operation no. of operation texts and work units or standard texts and flat rates

05-6010, 6020

Fig 1: Checking Camshafts Timing
G04677578Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Camshaft code numbers check (step 1).
TIMING OF INLET CAMSHAFTS

Position inlet camshaft of cylinder No. 1 or No. 6 so that only the base circles are resting against the bucket tappets (step 2).  
Dial gauge holder (02) install with threaded sleeve (04) at cylinder 1 or 6, special tool 363 589 02 21 00 (step 3).
Dial gauge (01) install in dial gauge holder (02) with tracer pin (03) on left side of camshafts to be checked (step 4).
Preload of 3 mm and angular position of 90° of tracer pin to bucket tappet set (step 5).
Crankshaft rotate with wrench socket in direction of rotation of engine, special tool 001 589 65 09 00.
At 2 mm valve lift, the reading on vibration damper must agree with the reading in table "Inlet valve opens".  
TESTING TIMING OF EXHAUST CAMSHAFTS

Position exhaust camshaft of cylinder No. 1 or No. 6 so that only the base circles are resting against the bucket tappets (Step 7).  
Dial gauge holder (02) 363 589 02 21 00 with threaded sleeve (04) install at cylinder No. 1 or No. 6 (step 8).
Dial gauge (01) with tracer pin (03) install at cylinder No. 1 on left side at cylinder No. 6 on right side of camshaft to be tested.
Preload of 3 mm and angular position of 90° of tracer pin (03) to bucket tappet set (step 9).
Crankshaft crank with wrench socket 001 589 65 09 00 in direction of rotation of engine.
At 2 mm valve lift, the reading on vibration damper must agree with the reading in table "Exhaust valve opens"  
TIMING IN CRANK ANGLE DEGREES (°CA) AT 2 MM VALVE LIFT 1) WITH NEW TIMING CHAIN

Engine Code numbers of camshafts (1) Inlet valve (2) Exhaust valve
  Inlet camshaft Exhaust camshaft opens ATDC closes ABDC opens BBDC closes BTDC
  rt lt rt lt        
119.960 58 56 62(3) 60(3) 25.0° 35.0° 13.0° 13.0°
  59(4) 57(4) 63(4) 61(4)        
119.970 74 72 78(4) 76(4) 30.0° 40.0° 13.0° 13.0°
972/974 75(4) 73(4) 79 (4) 77(4)        
119.971 82 80 86 84 30.0° 35.0° 8.0° 13.0°
  83(4) 81(4) 87(4) 85(4)        
119.970/ 972/974 (5)/ 980/982 98 96 02 00 33.0° 42.0° 10.0° 11.0°
119.971/ 975 (5)/ 981/985 90 88 94 92 30.0° - 8.0° -
1) Permissible variation: ± 2.0°CA. Perform test only when cam ascending (in direction of rotation of engine).
(1) Camshaft code number inscribed on camshaft bearing journal at front.
(2) Camshaft adjuster retarded.
(3) replaced by 78 or 76, respectively
(4) repair camshaft with 0.5 mm larger bearing diameter
(5) as of model year 1993

Special tools 

Fig 2: Identifying Special Tool (363 589 02 21 00)
G04677579Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig 3: Identifying Special Tool (001 589 65 09 00)
G04677580Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig 4: Identifying Special Tool (001 589 53 21 00)
G04677581Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Shop-made tool 

Threaded sleeve (reduction M8 to M6) for attaching dial gauge holder 363 589 02 21 00 to cylinder head cover sealing surface.

Fig 5: Identifying Cylinder Head Cover Sealing Surface Dimensions
G04677582Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
NOTE: If performing installation work, it is sufficient to check the basic setting of the camshafts (see 05-2230).

The timing is measured with the hydraulic bucket tappets.

Check "inlet valve opens" at No. 1 and No. 6 cylinder with 2 mm valve lift and camshaft adjuster retarded.

Check "exhaust valve closes" at No. 1 and No. 6 cylinder at 2 mm valve residual lift.

  1. Check camshaft code numbers. The camshaft code numbers are inscribed on the 3rd camshaft bearing journal (fitted bearing) (arrows) and stamped on the camshaft flange from behind with coloured ink.
    Fig 6: Locating Camshaft Code Numbers
    G04677583Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

    Checking timing of inlet camshafts 

  2. Rotate crankshaft in direction of rotation of engine until the lobes of the inlet cams to be tested are facing up (arrows) and only the base circles are resting against the bucket tappets.
    Fig 7: Identifying Inlet Camshafts Timing
    G04677584Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
  3. Install dial gauge, special tool (02) 363 589 02 21 00 with threaded sleeve (04) at sealing surface of cylinder head cover at the camshaft to be tested.
    Fig 8: Identifying Special Tool And Threaded Sleeve
    G04677585Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
  4. Clamp dial gauge (01) with tracer pin (03) (80 mm) in the dial gauge holder (02) so that the tracer pin (03) is resting vertically on the bucket tappet (arrow) with a preload of 3 mm (small pointer of dial gauge).
    NOTE: Check freedom of movement of tracer pin (03).
  5. Turn scale of dial gauge until large pointer of gauge (01) is at "0".
    Fig 9: Clamping Dial Gauge With Tracer Pin In Dial Gauge Holder
    G04677586Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
  6. Rotate crankshaft in direction of rotation of engine with wrench socket, special tool 001 589 65 09 00 until the dial gauge indicates a valve lift of 2 mm. In this position, the reading obtained at the vibration damper must agree with the reading "inlet valve opens ATDC".

    Testing timing of exhaust camshafts 

  7. Rotate crankshaft in direction of rotation of engine until the lobes of the inlet cams to be tested are facing up (arrows) and only the base circles are resting against the bucket tappets.
    Fig 10: Locating Inlet Cam Lobs
    G04677587Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
  8. Install dial gauge, special tool (02) 363 589 02 21 00 with threaded sleeve (04) at sealing surface of cylinder head cover at the camshaft to be tested.
    Fig 11: Identifying Dial Gauge And Threaded Sleeve
    G04677588Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
  9. Clamp dial gauge (01) with tracer pin (03) (80 mm) in the dial gauge holder (02) so that the tracer pin (03) is resting vertically on the bucket tappet (arrow) with a preload of 3 mm (small pointer of dial gauge).
    NOTE: Check freedom of movement of tracer pin (03). Install tracer pin (03) at No. 6 cylinder on right of camshaft.
    Fig 12: Clamping Dial Gauge With Tracer Pin In Dial Gauge Holder
    G04677589Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
  10. Turn scale of dial gauge until large pointer of gauge (01) is at "0".
  11. Use wrench bit, special tool 001 589 65 09 00, to rotate crankshaft in direction of rotation of engine until dial gauge indicates a valve lift of 2 mm.

    In this position, the reading obtained at the vibration damper must agree with the reading "exhaust valve closes BTDC".

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