Repair Manual

10
10 - 39
ENGINE AND LOWER ENGINE UNITS
VA LV E SEATS GRINDING
Dismount the cylinder head from the engine.
Dismount from the cylinder head:
- the water pump;
- the valves;
- the valves shafts sealing rings;
- the tilters platform;
- the cap attachment bolts;
- the spark plugs.
Place the cylinder head on the MOT 121
support plate.
Grind the valve seat by means of the MOT
287 tool for 102 engines and with MOT 501
tool for 106 engines observing the following
order:
- grind the working part (1) by means of the 45º cutter until the surface becomes clean and
shining on the whole circumference;
- take the new or the ground valve,marked on the working surface with paint or carbon
paper and place it on the seat;
- rotate the valve,take it out and check the mark left by the valve;
- according to the mark left,the surface (2) by means of the 15
0
or surface (3) is ground by
means of the 70 º cutter until the working surface is the prescribed one
( 1,1 - 1,4 mm for inlet and 1,4 - 1,7 mm for outlet ) and the mark left on the valve is halfway the
working surface of the latter.
Perform the lapping of the valve or of the valves,then place them in order so that they can be
mounted in the place they have been taken out.
Carefully wash the cylinder head and the valves and air blow them.
Check the valves sealing by means of gasoline.
Mount the following items:
- the tilters platform;
- the cap attachment bolts;
- the valves shafts sealing rings;
- the valves;
- the water pump;
- the spark plugs.
Mount the cylinder head on the engine with a new gasket observing the mounting
prescriptions.
Mount the acceleration cable and adjust the acceleration pedal stroke.
DISMOUNTING – MOUNTING
vnx.su