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4.3.9.3. Repair of a head of the block of cylinders

Head of the block of cylinders



1 – valve,
2 – head of the block of cylinders,
3 – spring support,
4 – maslootrazhatelny cap,
5 – spring,
6 – top plate of a spring,
7 – crackers,
8 – hydraulic pusher,
9 – washer,		 10 – bolt,
11 – the directing plug,
12 – hairpin,
13 – washer,
14 – nut,
15 – branch pipe,
16 – laying of a head of the block of cylinders,
17 – cap,
18 – the directing plug

Dismantling

PERFORMANCE ORDER
1. Remove a head of the block of cylinders from the engine and clear its external surface of dirt.
2. Remove collectors from a head of the block of cylinders.
3. Unscrew spark plugs and remove the ignition distributor.
4. Remove camshafts.
5. Using a rubber sucker, remove hydraulic pushers of valves. Do not overturn a head of the block of cylinders for extraction of hydraulic pushers at all. You store hydraulic pushers in a container with engine oil in vertical position. At the same time the flute for supply of oil in a hydraulic pusher has to be located from below (it is specified by an arrow).
6. Remove yokes, blocks of axial pressure and hydraulic pushers from a head of the block of cylinders. Using the device for compression of a spring of the valve, squeeze each spring and remove crackers from a valve end face. Remove the device for compression of a spring and take a plate springs and a spring. Flat-nose pliers, being careful, take a maslootrazhatelny cap from a valve rod. Take the lower plate of a spring.
7. When the spring of the valve is compressed and the cup of a spring is not removed from crackers, it is necessary to strike with the hammer through wooden whetstone a spring cup that will lead to release of crackers.
8. Take the valve via the combustion chamber. Each valve you store in a separate plastic bag together with a plate springs, a spring, a nest of a spring and crackers for their further installation on the places.

Check

PERFORMANCE ORDER
1. Remove the remains of old laying from a head of the block of cylinders.
2. Clear a deposit from combustion chambers, then wash up a head in the corresponding solvent.
3. Clear of carbonaceous deposits valves, perhaps, even with application of a wire brush.
4. Carefully examine a head of the block of cylinders on existence of cracks and other damages. In the presence of cracks the head is subject to replacement.
5. Using a metal ruler and the probe, check planeness of the interfaced surface of a head of the block of cylinders. At not planeness of more than 0,1 mm it is necessary to pereshlifovat a head, at the same time its height has to conform to requirements.
6. Check a condition of saddles of valves. If they are burned, worn-out or have defects, they need to be replaced. If wear of a saddle of the valve is insignificant, they need to be ground in. Check the directing plugs of valves for wear, inserting into them a core of the valve and moving it aside. Movement has to be insignificant. If movement is excessive, take the valve and measure diameter of a core of the valve. If necessary replace the valve. If the core of the valve is not worn-out, so the directing plug which needs to be replaced is worn-out. Replacement of the directing plugs of valves should be made at service station.
7. If saddles of valves have to be pereshlifovana, this operation needs to be executed after installation of new guides of valves.

Assembly

PERFORMANCE ORDER
1. Oil cores of valves engine and insert them on the places. Install the valve on those places where they were ground in.
2. Install the lower cup of a spring.
3. In a set of new maslootrazhatelny caps there is an adjusting plug which is installed on a core of the valve and protects working edges of maslootrazhatelny caps at their installation. Install the adjusting plug on a valve core, lower a maslootrazhatelny cap in fresh engine oil and establish it on a valve core into place, being careful not to damage its working edges. For installation of maslootrazhatelny caps use a special metal mandrel.
4. Establish a valvate spring and the top cup of a spring.
5. Special adaptation squeeze a valvate spring and establish crackers in dredging of a core of the valve and grease them. Remove the device for compression of a spring. Repeat this operation on other valves.
6. Knock with a hammer through wooden whetstone on a valve core end face in order that all elements of the valve accurately were established on the places.
7. Establish hydraulic pushers of valves in a head of the block of cylinders on the same places where they faced removal. Before installation of pushers grease nests in a head of the block of cylinders with pure engine oil. At installation of new hydraulic pushers lower them in a container with pure engine oil and several times manually squeeze them to fill them with oil.
8. Install camshafts.
9. Screw in spark plugs and install the ignition distributor.
10. Establish collectors, the thermostat and a casing of the thermostat.
11. Establish a head of the block of cylinders.