Attention! We carry out work on a viewing ditch or a lift.
To replace the head gasket or connecting rod and piston group of the engine, remove the cylinder head from the engine assembly with the receiver, intake pipe and exhaust manifold.
To remove the cylinder head:
- disconnect the negative battery cable;
- drain coolant (see Coolant replacement);
- remove throttle assembly (see Removing the throttle assembly);
- disconnect the hoses from the outlet pipe of the cooling jacket;
- disconnect the hose from the inlet pipe of the heater radiator;
- disconnect the fuel rail injector wire connector (see Removing the fuel rail);
- disconnect the connectors from the coolant temperature sensor of the injection system and the coolant temperature indicator sensor;
- remove the tips of high-voltage wires from the spark plugs;
- disconnect the fuel inlet and outlet pipes from the fuel rail;
- disconnect the exhaust pipe from the exhaust manifold (see Removing the downpipe), starter heat shield and heater radiator outlet tube bracket (see Replacing the gasket of the intake pipe and exhaust manifold of the injection engine);
- remove the camshaft and valve levers (see Removal of a camshaft and levers of a drive of valves of an injection engine);
- remove the camshaft sprocket, and tie the chain with wire.
head «at 13» unscrew the cylinder head bolt located next to the ignition module bracket.
head «at 12» unscrew the ten bolts securing the head to the cylinder block.
We take out the bolts.
We remove the cylinder head assembly with the exhaust manifold, receiver and intake pipe with the fuel rail.
The cylinder head can also be removed from the engine by first dismantling the receiver (see Removing the injection engine reservoir), intake pipe and exhaust manifold (see Replacing the gasket of the intake pipe and exhaust manifold of the injection engine).
Remove the cylinder head without the exhaust manifold and intake pipe.
Remove the cylinder head gasket.
Install the cylinder head on the workbench.
head «on 10» unscrew the two nuts that fasten to the head of the block of the inlet pipe of the heater radiator...
...and take it off.
Remove the sealing gasket.
head «at 13» unscrew the two nuts securing the outlet pipe of the cooling system jacket...
... and remove the pipe with the coolant temperature sensor of the injection system.
Remove the pipe seal.
When disassembling the valve train...
... we put an emphasis under the plate of the valve being dried out - a wooden block.
Dry the valve (see Replacing the valve stem seals of the gas distribution mechanism)...
... and remove the valve from the guide sleeve of the cylinder head.
In the same way we dismantle other valves.
We assemble and install the cylinder head in the reverse order.
Before installing the valves, we clean them of soot and lubricate the valve stems with engine oil.
Having assembled the valve mechanism,...
... we apply a hammer with a plastic striker to the ends of the valves for a more reliable fixation of crackers (in this case, the wooden stop must be removed from under the valve plate).
Before installing the pipes of the cooling system, we clean the mating surfaces of the pipes and the head of the block from the remnants of old gaskets.
We install new pipe gaskets, applying a thin layer of sealant to them.
We clean the mating surfaces of the head and cylinder block from the remnants of the old gasket, dirt and oil.
With a syringe with a needle or a rubber bulb, we remove oil and coolant from the mounting holes of the cylinder block.
We install the gasket and the cylinder head along two centering bushings.
Installing the head on the cylinder block, we pass the chain by the wire through the hole in the head.
After installing the cylinder head bolts, tighten them in the order shown in the figure.
To ensure reliable sealing and eliminate the need to tighten the bolts during vehicle maintenance, we tighten the bolts in four steps:
1st reception - tighten the bolts 1–10 with a torque of 20 N·m (2.0 kgf·m);
2nd reception - tighten bolts 1–10 with a torque of 69.4–85.7 N·m (7.1–8.7 kgf·m), and bolt 11 - with a torque of 31.4–39.1 N·m (3.2–4.60 kgf·m).
Then turn bolts 1–10 by 90° (3rd reception) and another 90° (4th reception).