Tech Info: Variable Camshaft Adjustment

VAICO offers a wide range of camshaft adjustment components in guaranteed best quality. Practical repair kits in the Expert Kits+ category, e.g. camshaft repair kits, complete our product range.

VAICO | 4. January 2018 | Moritz Helms

Available languages:

TECH-INFO

How variable camshaft adjustment works

The variable camshaft adjustment means that engine idling is improved and the response of the engine is optimised. Fuel consumption and emission values are also reduced. This improves power delivery and therefore also results in enhanced performance. Depending on the engine design, it is possible to implement cylinder deactivation. Better internal cooling of the engine leads to less wear and tear. Depending on the engine, the adjustment may act as a form of internal exhaust gas recirculation and significantly reduce NO_xvalues.

In the case of a short valve overlap in the full load range, the inlet valve closes very late. Subsequent inflow of fresh gases despite the piston moving upwards increases the boost effect of filling as well as the torque, which is particularly common indirect injection engines.

In the case of a longer valve overlap in the partial load range, the inlet valve closes earlier, briefly after being below dead centre. Fresh gases remain in the combustion chamber, whilst the combustion temperature and nitrogen oxide (NONO_x) falls.

Various designs are offered depending on the manufacturer.

Symptoms

Higher fuel consumption
Loss of performance
Irregular engine function
Rattling timing chain
Engine warning light flashes, engine fail-safe

Failure Causes

Dirt in the oil chambers
Thermal issues due to the engine overheating
Contact issues due to cable breakage or oxidation

Consequential Damages

Engine runs poorly
Increased fuel consumption
Thermal issues
Poor emission values
Greater wear and tear in the engine
The timing chain tears (engine damage) depending on the design
Locked engine warning light for EURO 5 and higher (reduction of engine performance)

Expert Kits+ – practical repair kits for workshop requirements

VAICO recommends replacing the timing chain set (V10-10010-BEK) together with the camshaft adjuster (V10-4408). Both items are also available together as Expert Kit+ (V10-10010). In addition to the timing chain kit and camshaft adjuster, this kit also includes a gasket, accessories and a suitable amount of engine oil.

Camshaft Adjuster