We replace the cylinder head gaskets when there is a leak of coolant and oil in the connection between the cylinder head and the cylinder block.
To do the job, we need a tool: wrenches 8x10, 12x13, 17x19, 22x24, 27x30, interchangeable heads for 13, 14, 17, 19 mm, knob, blade, knob, screwdriver, chisel, hammer, flat scraper, jack, stand , dishes for fuel, oil and coolant, torque wrench.
First of all, we disconnect the electrical wires from the batteries.
Drain the coolant.
We turn out the bolts and remove the cover of the front hatch of the clutch housing.
Raise the front of the car and place a stand under the first cross member of the frame.
With a 14 head and a key, we unscrew the drainage pipeline (return), Figure 1.
Unscrew the high pressure pipes from the engine injectors.
Unscrew the high pressure pipes from the injection pump, Figure 3.
Loosen the exhaust manifold bolts (Fig. 4).
Remove the intake manifolds.
With a head of 13, we unscrew the bolts and disconnect the flange of the thermostat box.
We unscrew the bolts of the water pipes and separate the pipes from the cylinder heads with a mounting spatula.
We turn out the bolts 1 (Fig. 5), fastening the cylinder head covers and remove the covers 2 with gaskets 3.
On the heads of the fourth and eighth cylinders, you need to unscrew the nuts securing the rocker arms and remove the racks as an assembly with the rocker arms and the rocker arm retainers and push rods.
Using a 19 head, loosen the cylinder head bolts in the sequence shown in Figure 6, then turn them out, remove the heads and mark their numbers.
It is impossible to put the head with the mating plane, so as not to damage the injector nozzles.
We take out the pusher rods and stack them in accordance with the numbers of the cylinder heads.
Remove the cylinder head gaskets: sealing and steel for the gas joint.
We clean the mating surfaces of the cylinder heads and cylinder block from carbon deposits and scale.
Installing cylinder head gaskets
We install gaskets on the cylinder block.
We install new steel cylinder head gaskets on the upper end of the sleeves (lubricate the steel gaskets with engine oil before installation).
We install the pusher rods, screw in the adjusting screws.
Blow out the threaded holes, clean them of dirt and blow with compressed air.
We install the cylinder heads, centering them on the pins of the block, while making sure that the adjusting screws for thermal gaps enter the tips of the rods.
Before screwing in the head bolts, lubricate the threaded part of the bolts with graphite grease mixed with engine oil.
We tighten the head bolts in three steps in the sequence shown in Figure 6:
- - first pass - 39.2 ÷ 49.1 Nm (4 - 5 kgcm);
- - second step - 117.7 ÷ 147.2 Nm (12 - 15 kgcm);
- - third step - 156.9 ÷ 176.5 Nm (16 - 18 kgcm).
We adjust the thermal gaps in the valve mechanism. The clearance for intake valves is 0.25 - 0.30, for exhaust valves 0.35 - 0.40 mm.
Installing the front clutch housing cover.
We screw in the bolts of the exhaust manifolds.
We install the head covers with gaskets and fasten them with bolts and flat washers.
We install water pipe gaskets, water pipes assembled with a connecting pipe, tighten with bolts with flat and spring washers.
We attach the flange of the thermostat box with bolts with flat and spring washers.
Mouth we fill the intake manifolds and connect the pipelines to the heads.
Remove the stand from under the front of the car and fill in the coolant.
Connect the electrical wires to the battery.
We start the engine and check the operation of the gas distribution mechanism.