Volvo B5254T3 Manual page 12

Cylinder head, camshafts
Cooling is more effective due to larger coolant ducts and a more directed flow between the exhaust
ports and around the spark plug wells.
Multi Layer Steel (MLS) gasket for the cylinder head.
Cylinder head with CVVT on the intake and exhaust camshafts.
Change over angle CVVT:
- Intake = 50 crankshaft degrees
-
Exhaust = 30 crankshaft degrees
The engine mounting bracket is located on the cylinder head and secured with 5 bolts that must be
tightened in three stages. See VADIS.
Oil Filter / Oil Trap
The filter and trap are integrated into one unit.
The filter has been moved from the oil pan to the intake side of the engine. This causes less oil spillage
when replacing the filter than on previous engines.
The filter and cover are the same as those used on Volvo's own diesel engine (D5244T/T2).
Oil flows from the outside in through the filter.
To ensure that oil flows even if the filter is clogged, there is an overflow valve in the cover that opens at
11kPa and when starting the vehicle from cold (-20°C to -25°C).
Oil Separation
The same as in B524454. In addition, in the turbocharged engines the gases go from the diaphragm to
a T-coupling and from there, either to reed valves in the intake gasket or to the turbocharger, depending
on engine load and engine speed.
Spark Plugs
To reduce carbon deposits when starting the vehicle from cold, the ceramic is thinner at the tip of the
spark plug. This is called Quick Heat.
The spark plugs have a longer thread = 26.5 mm (previously 19.0 mm).
The spark plug has one electrode.
The diameter of the center electrode is now 1.1 mm (previously 0.8 mm).
The tightening torque is 28 N •m •m
(+ l- 3 N ).