Renault Megane, Scenic

Since 1996 of release

Repair and car operation

Repair of petrol engines of 2.0 l in an impellent compartment

In this Part of the Head repair procedures in an impellent compartment on petrol engines in volume of 2.0 l are considered.
Performance of the majority of the works described in the Part is based on a condition that the engine is established in the car. Therefore, if this information is used at a full partition of the engine when it is already removed, many of these works will not be carried out.

The engine

The engine - 4-cylinder, рядный, with the cam-shafts located from above to one (engine F7R), is established cross-section in a forward part of the car.
The block of cylinders is cast from pig-iron, pistons движутся in the cylinders drilled directly in the block. Коленвал it is supported in five radical bearings. The persistent washers established on radical bearings №2, define an axial backlash коленвала.
Rods are connected with коленвалом шатунными bearings to loose leaves, and with pistons - piston fingers. Piston fingers are fixed by lock rings. Pistons are made of an aluminium alloy and have three rings - two компрессионных and one маслосъемное.
In a head of the block of cylinders from an aluminium alloy one or two top cam-shafts which are fixed in five bearings are established and resulted from коленвала by means of gear drive a belt.
Cam-shafts operate work of valves through pushers. On engines F3R adjustment of a backlash of valves is carried out by washers which are established on pushers. On engines F7R the backlash of valves is automatically adjusted by hydraulic pushers. Inlet and final valves on engines F3R are closed by one spring, and on engines F7R - two springs.
On early engines F3R and all engines F7R, there is an intermediate shaft which is established near to коленвалом and is resulted by a gear belt. It puts in action the oil pump. On later engines F3R (address to Specifications) the oil pump is resulted by a chain from коленвала: on these engines of an intermediate shaft is not present, and the cogwheel carries out roller function.
In engines the half-closed system of ventilation картера is used; картерные gases are taken away from an oil separator on the block of cylinders and pass through a hose to the inlet pipeline.
Greasing moves in the engine under the pressure created by the oil pump, established more low коленвала.
Impellent oil moves through the oil filter established outside to the main lubricant channel serving коленвал, an intermediate shaft (where is available) and a cam-shaft ().

The repair procedures which are carried out without removal of the engine from the car

a) Removal and installation of a head of the block of cylinders.
b) Removal and installation gear drive a belt and cogwheels.
Epiploon Replacement (ов) a cam-shaft.
d) Removal and cam-shaft installation (ов).
f) Removal and installation of rods and поршней.*
g) Removal and installation of the oil pump.
h) Replacement of epiploons коленвала.
i) Replacement of support of the engine.
j) Removal and flywheel installation.

Though the procedures noted by an asterisk can be executed with the engine in the car (after pallet removal), it will be convenient for making on the removed engine.