In this guide you will learn how to adjust the valve clearance. The guide is aimed at the most common engine mounted on Felicia, 1.3 MPI. The procedure is similar for other engine types, but check the Service manual for specific clearance values.
Prerequisites
The engine must be cold and the air temperature must be below 20 C.
Remove all spark plugs.
Remove the valve cover.
In order to be able to rotate the engine, jack up the front right wheel and shift in 4th gear. By rotating the front right wheel clockwise by hand, the crankshaft of the engine will rotate easily.
Tools needed
Flat screwdriver
11 mm ring wrench
Feeler gauge set
Torque wrench (optional)
The "5" method
We will apply the method known as the "5" method for reasons described below.
Definition: Valve overlap - we say that the valves overlap when, for a short time, both valves (intake and exhaust) are open. This moment occurs when the exhaust stroke ends and the intake stroke begins. In terms of crankshaft angle of rotation for all Felicia 1.3 engines, the valves overlap for 20 - 39 degrees. We can assess that moment fairly precise for each cylinder by watching the movement of respective rockers. We look for the precise moment when the exhaust rocker is ending to move up and the intake rocker is starting to move down simultaneously.
So let's do it!
Rotate the crankshaft until:
Cylinder 4 valves overlap --> Adjust valves clearance on cylinder 1
Rotate the crankshaft 180 degrees until:
Cylinder 2 valves overlap --> Adjust valves clearance on cylinder 3
Rotate the crankshaft 180 degrees until:
Cylinder 1 valves overlap --> Adjust valves clearance on cylinder 4
Rotate the crankshaft 180 degrees until:
Cylinder 3 valves overlap --> Adjust valves clearance on cylinder 2
We see now why the method is called the "5" method. The sum of the cylinder numbers for overlapping and adjusting is always 5 (4+1, 2+3, 1+4, 3+2).
The process is shown in detail in the figure below.
Adjustment
Insert the ring wrench over the locking nut of the rocker and unscrew it half a turn. Insert the corresponding feeler gauge between the rocker and the valve stem (see photo below). Rotate the screw with the screwdriver until the feeler gauge moves with a slight drag. Keep the screwdriver still and lock the nut with the ring wrench. Optionally torque the nut at 15 Nm with a torque wrench. Repeat the process to all eight valves. Then rotate the engine two turns and recheck all eight valves again.
Assemble everything in reverse order.