New features
48
Service information
Introduction of New Generation of 4-Cylinder Inline Engines, OM 651
q
Dual stage turbocharging
The vacuum units of the turbocharger can be replaced
individually with the turbocharger installed.
Attention must be paid to t
he following important
points:
• The color coding on the control lines
• The nuts secured with temperature-resistant paint
Oil spray nozzles
The oil spray nozzles can be replaced individually. The
exact seating is defined by a positioning screw.
Crankshaft
The vibration damper (TSD) has a fourfold threaded
connection. This means that the forces acting on the
damper are distributed across four bolts, which
reduces the stress on each specific bolt. A special tool
is available for easy installation.
The signal from the camshaft sensor is used by the
CDI control unit
as a substitute value for engine
control. If the sensor for the crankshaft fails, the
engine can be operated and started in emergency
operation mode using the camshaft sensor.
Seals
The seals in the exhaust area are equipped with pins
and polygonal curves. The seals are prefixed and the
screws are conveniently secured against falling out,
which simplifies installation. In addition, the seals are
equipped with an installation checking pin. This makes
it possible to check whether the seal is installed after
assembly.
Seal with installation checking pin (arrow) on charge air manifold
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