We remove the cylinder head for repair, to replace the gasket under the head and for a complete engine overhaul.
We conditionally describe all operations on the engine, which has already been removed from the car.
Remove the wire ends from the spark plugs.
Unscrew and remove the spark plugs
Disconnect the crankcase exhaust pipe
Disconnect the vacuum regulator hose of the ignition distributor sensor.
Remove the air filter housing and carburetor
With a socket wrench or a 10 head, we unscrew the six bolts of the block head cover
Remove the cylinder head cover
Remove the cylinder head cover gasket
Using a 13 wrench, unscrew the two nuts of the side pillars of the rocker axis
Using a key or a 17 head, we unscrew four nuts of the racks of the rocker axis in succession.
Remove the axis of the rocker arms from the studs (you can gently pry with a screwdriver).
We take out eight push rods in turn.
In this case, you need to mark the rods or put them in a row and remember the position in order to install all the rods in their places during assembly.
With a head of 17, we unscrew ten nuts securing the head in succession.
It is advisable to unscrew in the reverse tightening sequence (see the figure for tightening the nuts).
We take out the cylinder head (When removing, do not pry the head with a screwdriver or other tool in the mating plane)
Removing the cylinder head gasket
The cylinder head nut tightening sequence is shown in the figure.
We install the head in the reverse order, having previously lubricated the cylinder head gasket with graphite grease and putting it on the block studs.
We tighten the block head nuts in two stages:
- 1st stage - 40–60 Nm (4.0–6.0 kgf m);
- 2nd stage - 83-9.0 Nm (8.3-9.0 kgf m).