Mercedes-Benz B-Class Quiz
Diesel engines

Cylinder head

In this manual: Diesel engines
Operator's Manual - Mercedes-Benz B-Class — 194Airbags and belt tensioners — 9Diesel engines — 22Electrical equipment — 6Automatic transmission — 5Manual gearbox — 5Brakes — 12Heating - air conditioning — 13Suspension - axles - geometry — 7Vehicle specifications and identification — 7Driveshafts — 4Steering — 6Clutch — 4Body — 18
~1min read

Aluminium alloy cylinder head.

Maximum distortion of the lower sealing face: 0.05 mm.

est supérieur à la valeur préconisée, remplacer la culasse.If distortion exceeds the specified value, replace the cylinder head.

CYLINDER HEAD BOLTS

10 external Torx head bolts (M12) and 2 M8 bolts.

Tightening sequence: in a crisscross pattern, starting with the centre bolts.

Length under head of M12 bolts (Fig.1):

  • new bolt: 118.5 mm.
  • bolt to be replaced: 120.5 mm.

Culasse
Fig. 1

Before each reassembly, clean the bolts with a wire brush and coat the threads and underhead surfaces with engine oil.

d'une vis est hors tolérance, remplacer toutes les vis de culasse.If the length of any bolt is out of tolerance, replace all cylinder head bolts.

VALVES

Valve clearance

No adjustment; clearance is compensated by hydraulic lash adjusters.

HYDRAULIC LASH ADJUSTERS

Lash adjusters support the roller rocker arms that actuate the valves. They automatically compensate for operating clearance between the roller rocker arms, camshafts and valves.

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