3.3.15. Head of the block of cylinders
Prevention
At installation of a head of the block of cylinders it is necessary to use new bolts.
Head of the block of cylinders
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1 – cap;
2 – hairpin;
3 – nut;
4 – covers of bearings of the camshaft;
5 – rubber cap;
6 – head of the block of cylinders;
7 – guides of valves;
8 – saddles of valves;
9 – laying
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Removal
Sequence of tightening of bolts of fastening of a head of the block of cylinders
| PERFORMANCE ORDER |
| 1. Merge cooling liquid from the cooling system. |
| 2. Remove inlet and final collectors. |
| 3. Remove a camshaft pulley. |
| 4. Unscrew bolts of fastening of a back casing of a gear belt to a head of the block of cylinders. |
| 5. Weaken collars and disconnect hoses of supply of cooling liquid to a casing of the thermostat and a head of the block of cylinders. |
| 6. Unscrew nuts and remove wires from incandescence candles. |
| 7. Disconnect the socket from the sensor of temperature of cooling liquid. |
| 8. Disconnect pipelines of supply of fuel from fuel nozzles and the fuel pump of high pressure and remove pipelines. |
| 9. Gradually unscrew bolts of fastening of a head of the block of cylinders as it should be, the return shown in the drawing Sequence of Tightening of Bolts of Fastening of a Head of the Block of Cylinders. |
| 10. Take bolts together with washers. |
| 11. Remove a head from the block of cylinders and laying. |
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Preparation for installation
Arrangement of openings for identification of thickness of laying of a head of the block of cylinders
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And – the opening is absent – 1,4 mm; In – one opening – 1,45 mm;
With – two openings – 1,5 mm
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Points of measurement of a vystupaniye of the piston
| PERFORMANCE ORDER |
| 1. The interfaced surfaces of a head and the block of cylinders of the engine need to be cleared carefully of the remains of laying and a deposit, using a plastic or wooden scraper. It is also necessary to clear the top parts of pistons. When cleaning exclude a possibility of hit of products of cleaning to oil canals of the cooling system. |
| 2. Check the surfaces of interface of a head and the block of cylinders of the engine for existence of defects. Insignificant damages are eliminated with machining. Also using a metal ruler and the probe, check planeness of a prileganiye of surfaces. |
| 3. Clear openings under bolts in the block. Screwing up of a bolt in the opening filled with oil can break off the block because of hydraulic pressure. |
| 4. Depending on the size of a vystupaniye of pistons from the block of cylinders it is necessary to use laying of a head of strictly certain thickness. Thickness of laying is identified by the openings punched in the left forward angle of laying (see rice. An arrangement of openings for identification of thickness of laying of a head of the block of cylinders). |
| 5. Check that the bent shaft is in the provision of the top dead point of the piston of the first cylinder. Install the indicator of hour type on an arm on the block of cylinders. Install a measuring tip on the block of cylinders and establish an indicator scale on 0. Install a measuring tip on the piston of the first cylinder and slightly turn a bent shaft in both parties and note the highest value on the indicator. Write down this value. Check a piston vystupaniye in three points (see rice. Points of measurement of a vystupaniye of the piston and tab. 1). |
| 6. Similarly measure a piston vystupaniye on the cylinder No. 4. Then turn the camshaft on 180 ° and repeat measurement of a vystupaniye of pistons on cylinders 2 and 3. Turn the camshaft on 540 ° and install it in a starting position. |
| 7. Define an average vystupaniye of the piston, putting 12 sizes of a vystupaniye of pistons and having divided total number on 12. Using the size of an average vystupaniye of the piston, pick up laying of a head of the block of cylinders (see tab. 2). |
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Table 1
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Quantity of openings
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Laying thickness
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Without opening
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1,40 mm
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1 opening
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1,45 mm
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2 openings
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1,50 mm
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Table 2
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Vystupaniye
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Laying piston thickness
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0,58 – 0,64 mm
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1,40 mm
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0,65 – 0,70 mm
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1,45 mm
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0,71 – 0,78 mm
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1,50 mm
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REPAIR OF THE HEAD OF THE BLOCK OF CYLINDERS
The main operations on repair of a head of the block of cylinders see
subsection 2.21.
Special drift for a vypressovka of candles of an incandescence
Vypressovka of incandescence candles with use of a special drift
| PERFORMANCE ORDER |
| 1. For a vypressovka of vortex cameras use a special drift (see rice. A special drift for a vypressovka of candles of an incandescence), inserted through an opening for a glow plug. |
| 2. At installation of vortex cameras, combine an adjusting pin with a groove in a head of the block of cylinders. Press vortex cameras with effort no more than 28 000 N. Proverte a vystupaniye of the vortex camera. |
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Installation
Installation of laying on the block of cylinders of the engine
Tightening of bolts of fastening of a head of the block of cylinders
| PERFORMANCE ORDER |
| 1. Wipe the interfaced surfaces of the block of cylinders and a head of the block of cylinders. |
| 2. Check that two directing pins are established in a head of the block of cylinders and establish laying of a head of the block of cylinders (see rice. Installation of laying on the block of cylinders of the engine). |
| 3. Check that the tag of a pulley of a bent shaft is combined with the index, and the camshaft is installed in a head of the block of cylinders so that cams of the first cylinder were directed up. |
| 4. Establish a head of the block of cylinders. |
| 5. Grease bolts of fastening of a head of the block of cylinders with engine oil and, being careful, insert them into nests. Screw up bolts of fastening of a head by hand. |
| 6. In the sequence shown in the drawing Sequence of Tightening of Bolts of Fastening of a Head of the Block of Cylinders tighten bolts of fastening of a head of the block of cylinders in several stages. |
| 7. Further installation is made in the sequence, the return to removal. Fill in cooling liquid in the cooling system. |
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