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Inspecting and machining valves - RA05001192800X(05-2800)

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Preceding work:

Cylinder head removed (01-4150) .

Valve springs removed (05-2500) .

Valves removed

Operation no. of operation texts and work units or standard texts and flat rates 05-4201

Fig 1: Inspecting Valve
G04677659Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Valves clean, inspect visually.
Valve stem inspect for runout (max. 0.03 mm).
Valve seat inspect for runout (max. 0.05 mm), grind.
Dimensions and angle inspect (table).
DIMENSIONS AND ANGLE DATA

Engine up to 119.960 12 011 930 as of 119.960 12 011 931
  Inlet valve Exh. valve Inlet valve Exh. valve
Valve disc Ø (D) 37.90  32.90  37.90  32.90 
38.10 33.10 38.10 33.10
Height (h) of valve disc when new 1.15-1.45 1.55-1.65 1.15-1.45 1.4-1.7
limit val. 1.05 1.3 1.05 1.3
Setting angle (α) for machining valve 45° + 15' 45° + 15' 45° + 15' 45° + 15'
Valve stem Ø (D 1) 7.970  8.960  6.975  6.970 
7.955 8.938 6.960 6.950
Sodium filling without with without with
Valve length (L) 95.8 102.6 95.8 102.6
Width of valve seat min. 1.4 min. 1.4 min. 1.4 min. 1.4
max. 2.0 max. 2.0 max. 2.0 max. 2.0
Maximum permissible runout at valve stem and valve seat 0.05 0.05 0.05 0.05
Grooves for wedges on stem 1 1 3 3
VALVE STEM AND VALVE SEAT DATA

Engine up to 119.970 12 049 738 as of 119.970 12 049 739
up to 119.972 12 010 751 as of 119.972 12 010 752
up to 119.974 12 009 281 as of 119.974 12 009 282
  Inlet valve Exh. valve Inlet valve Exh. valve
Valve disc Ø (D) 37.90  32.90  37.90  32.90 
38.10 33.10 38.10 33.10
Height (h) of valve disc when new 1.15-1.45 1.4-1.7 1.05-1.35 1.4-1.7
limit val. 1.05 1.3 0.95 1.3
Setting angle (α) for machining valve 45° + 15' 45° + 15' 45° + 15' 45° + 15'
Valve stem Ø (D 1) 6.975  6.970  6.970  6.970 
6.960 6.950 6.950 6.950
Sodium filling without with without with
Valve length (L) 95.8 102.6 95.7 102.6
Width of valve seat min. 1.4 min. 1.4 min. 1.4 min. 1.4
max. 2.0 max. 2.0 max. 2.0 max. 2.0
Maximum permissible runout at valve stem and valve seat 0.05 0.05 0.05 0.05
Grooves for wedges on stem 3 3 1 1
VALVE STEM AND VALVE SEAT DATA

Engine up to 119.971 12 023 158 as of 119.971 12 023 159
up to 119.975 12 018 412 as of 119.975 12 018 413
as of 119.98 start of prod.
  Inlet valve Exh. valve Inlet valve Exh. valve
Valve disc Ø (D) 34.90  32.90  34.90  32.90 
35.10 33.10 35.10 33.10
Height (h) of valve disc when new 1.15-1.45 1.4-1.7 1.05-1.35 1.4-1.7
limit val. 1.05 1.3 0.95 1.3
Setting angle (α) for machining valve 45° + 15' 45° + 15' 45° + 15' 45° + 15'
Valve stem Ø (D 1) 6.975  6.970  6.970  6.970 
6.960 6.950 6.950 6.950
Sodium filling without with without with
Valve length (L) 95.8 102.6 95.8 102.6
Width of valve seat min. 1.4 min. 1.4 min. 1.4 min. 1.4
max. 2.0 max. 2.0 max. 2.0 max. 2.0
Maximum permissible runout at valve stem and valve seat 0.05 0.05 0.05 0.05
Grooves for wedges on stem 3 3 1 1
NOTE: The stem of the exhaust valve is filled with sodium.

IMPORTANT

Unusable valves filled with sodium should be neutralized before scrapping. They should therefore be gathered by the relevant workshop sector foreman and returned to:

Mercedes-Benz AG

Werk Marienfelde

Daimlerstraβe 145

Anlieferstelle KST 3153

Arbeitsvorbereitung TAI

Fig 2: Identifying Valve
G04677660Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Special tools 

Fig 3: Identifying Special Tool (001 589 53 21 00)
G04677661Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
COMMERCIALLY AVAILABLE TOOLS AND TESTERS

Designation e.g. make Order no.
Valve cone grinding machine or valve cone turning tool Hunger, D-81375 Munchen
Graflingerstr.		 Type VKM 1 A
Order no. 146 231 00 001

Inspecting and machining 

  1. Clean valves and conduct a visual inspection.

    Valves with scorched valve disc, insufficient height (h) of valve disc or with worn or scored valve stem should be replaced.

    Fig 4: Inspecting Scorched Valve Disc And Insufficient Height
    G04677662Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
  2. Measure runout at valve stem. If a runout of more than 0.03 mm is measured, replace valve.
    Fig 5: Measuring Runout At Valve Stem
    G04677663Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
  3. Machine valve seat.

    Pay attention to operating instructions of machining equipment and setting angle (α) 45°+15'.

    IMPORTANT

    If conducting facing work on cylinder head and re-setting of valve seats, always replace valves.

    The valve seats of valves as of model designation M119.98 must not be remachined; these should be replaced when performing repairs.

  4. Measure runout at valve seat and height (h) of the valve disc.

    If the runout is greater than 0.05 mm or the height (h) is less than the specification in the table, replace the valve.

    Fig 6: Measuring Runout At Valve Seat And Height Of Valve Disc
    G04677664Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
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