mercedesbenz Workshop Repair Guides

Mercedes Benz Workshop Service and Repair Manuals

Valve Seat Grinding Dimensions|Page 2129 > < Engine - Hard Starting, Cuts Out, No Power, Vibrates|Page 2126
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Valve Seat: Specifications
Valve Seat Grinding Dimensions

INTAKE VALVE SEATS

Seat width

1.80 - 2.50mm (0.071 - 0.098in)

Seat angle

45° -15' 

Top correction angle

15°

Bottom correction angle

60°

Radial runout

0.05mm (0.002in)

EXHAUST VALVE SEATS

Seat width

1.50 - 2.50mm (0.059 - 0.098in)

Seat angle

45° -15' 

Top correction angle

15°

Bottom correction angle

60°

Radial runout

0.05mm (0.002in)

VALVE HEAD TO CYLINDER HEAD MATING SURFACE CLEARANCE

Minimum Distance A, With New Valve Seats And New Valves:
Intake Valve 

1.2 mm (0.047 in)

Exaust Valve 

0.5 mm (0.020 in)

Maximum Distance A, With Reworked Valve Seats and Reground Valves:
Intake Valve 

2.1 mm (0.083 in)

Exaust Valve 

1.4 mm (0.055 in)

Valve Seat Grinding Dimensions|Page 2129 > < Engine - Hard Starting, Cuts Out, No Power, Vibrates|Page 2126