Renault Clio: Camshaft dephaser: Function
Renault Clio III (2005-2013) Service Manual / Engine And Peripherals / Top And Front Of Engine / Camshaft dephaser:
Function
I - SPECIAL NOTES
Its role is to modify the valve timing.
To improve cylinder filling at all engine speeds, the engine is fitted with an inlet camshaft dephaser (1).
Dephasing at the moment when the inlet valves close optimises filling according to engine speed. Torque at midrange engine speed and output at high engine speed are improved.
Leaving the inlet valves open for longer at high engine speed allows the mixture to be continually admitted thanks to its high speed.
However, at lower engine speeds the gases do not have a high level of inertia. It is therefore preferable to close the inlet valves earlier to avoid incorrect filling and a loss of torque due to the reflux of fresh gases.
The higher the engine speed, the later the inlet valves must be closed.
II - OPERATION AND PROGRAMMING
The oil is supplied to the dephaser by a solenoid valve (2) located on the cylinder head.
The supply by a variable OCR signal (amplitude 12 V, frequency 250 Hz) enables oil to be distributed to the mechanism and the dephaser angle to be adjusted.
The operation of the camshaft dephaser varies continuously.
The computer supplies the solenoid valve (2) with a variable opening cyclic ratio proportional to the desired dephasing.
Dephasing is varied continuously from 0 to 43
READ NEXT:
Camshaft dephaser:
Removal - Refitting
M4R
The engine and gearbox assembly must be removed
to remove/refit the camshaft dephaser (see
10A, Engine and cylinder block assembly, Engine
- gearbox assembly: Removal - Refitting, 10A-112).
Camshaft: Removal -
Refitting
D4F, and 740 or 742 or 764
REMOVAL
I - REMOVAL PREPARATION OPERATION
Position the vehicle on a two-post lift (see Vehicle:
Towing and lifting) (MR 392, 02A, Lifting equipment).
Disconnect the bat
Camshaft seal, timing end:
Removal - Refitting
K9K
REMOVAL
I - REMOVAL PREPARATION OPERATION
Position the vehicle on a two-post lift (see Vehicle:
Towing and lifting) (MR 392, 02A, Lifting equipment).
Disconnect the battery (see Battery: Remo
SEE MORE:
Air inlet: Description
D4F
D4F, and 740 or 742 or 764
Air inlet
Air inlet trunking
Air filter unit
Motorised throttle valve
Inlet manifold
D4F, and 784
air inlet
Air filter box air inlet pipe
Air filter unit
Air filter box outlet air pipe
Turbocharger air outlet pipe
Intercooler
Intercooler air outlet pip
Side Lower Structure
Sill panel: Description
B85 or K85
To replace this part, also order the expanding inserts
corresponding to each of the following cases.
The options for replacing this part are as follows:
partial replacement of the front end section, order the
exterior A-pillar insert (see 40A, General informat
