Dismantling of a head of the block of cylinders is carried out in the following order:

– remove a head of the block of cylinders from the engine (see subsection 3.2.5);

Fig. 3.44. Inlet collector: 1 – case of a butterfly valve; 2 – laying of the case of a butterfly valve; 3 – top section of an inlet collector; 4 – laying of the top section of an inlet collector; 5 – laying of the lower section of an inlet collector; 6 – bolt of fastening of the lower section of an inlet collector; 7 – lower section of an inlet collector; 8 – bolt of fastening of the top section of an inlet collector

– turn off bolts 6 (see fig. 3.44 ) fastenings of the lower section of an inlet collector and remove section 7;

Fig. 3.45. Final collector: 1 – nut of fastening of a casing of a final collector; 2 – casing of a final collector; 3 – a tube of removal of the fulfilled gases for verification of the contents of CO; 4 – sections of a final collector; 5 – nut of fastening of section of a final collector; 6 – laying of a final collector; 7 – hairpin of fastening of a casing of a final collector

– turn off nuts 5 (see fig. 3.45 ) fastenings of sections of a final collector and remove section 4;

Fig. 3.47. Camshafts and mechanism of the drive of the valve: 1 – camshafts; 2 – asterisks of camshafts; 3 – ignition distributor drive coupling; 4 – bolts of fastening of asterisks of camshafts; 5 – hydraulic pusher; 6 – valve crackers; 7 – top plate of a spring; 8 – external spring; 9 – internal spring; 10 – an oil scraper cap, 11 – a head of the block of cylinders, 12 – inlet and final valves; A – hexagons for installation of a wrench for fixing of camshafts from an otvorachivaniya of bolts of fastening of asterisks

– turn off bolts of 4 (fig. 3.47) of fastening of asterisks of camshafts, keeping them from a provorachivaniye a nut key for hexagons of A, vyfrezerovanny on them, and remove asterisks 2;

Fig. 3.48. Camshafts and covers of bearings of camshafts

– turn off nuts of fastening of covers of bearings No. 1 and 7 (fig. 3.48) of the camshaft and uncover;

– turn off nuts of fastening of covers of bearings No. 3 and 5. Nuts need to be turned off serially cross-wise on a half of a turn for one pass until they cannot be turned off manually;

– uncover bearings No. 3 and 5;

– remove the camshaft of the drive of valves of cylinders No. 1, 3 and 5;

– turn off nuts of fastening of a cover of the bearing No. 4 and uncover;

– turn off nuts of fastening of covers of bearings No. 2 and 6. Nuts need to be turned off serially cross-wise on a half of a turn for one pass until they cannot be turned off manually;

– uncover bearings No. 2 and 6;

– remove the camshaft of the drive of valves of cylinders No. 2, 4 and 6;

– take hydraulic pushers 5 (see fig. 3.47 ) from a head of the block of cylinders, put pushers in the place of storage as removal for the subsequent their correct installation on the places;

Fig. 3.15. Compression of springs of the valve special adaptation and removal of crackers of the valve

– squeeze a valve spring special adaptation (see fig. 3.15 ) and take crackers 6 (see fig. 3.47 ) the valve;

– remove the top plate 7 and springs of the 8 and 9 valve;

– take the valve 12 of a head of the block of cylinders from the combustion chamber;

– remove other valves, clear valves of a deposit a wire brush, wash out them in kerosene and dry;

– place sets of valvate mechanisms in separate plastic bags and mark packages for the subsequent correct installation of valves on the places;

– remove oil scraper caps 10 by means of special capture.

– clear and blow compressed air all threaded connections of a head of the block of cylinders;

– clear and wash out crackers, springs and nests in kerosene, then carefully dry up them.

Recommendations about cleaning and sink of details of a head of the block of cylinders are provided in subsection 3.1.7.

Operations of fault detection of camshafts and hydraulic pushers are described in subsection 3.1.5.

Fault detection of a head of the block of cylinders of the AAA engine is carried out in the sequence described in subsection 3.1.7.

Fig. 3.49. Profile of a saddle of the inlet valve: Z — the privalochny plane of a head of the block of cylinders; a = 38,3 mm; c = 1,4–2,0 mm; a = 45 °; b = 30 °; g = 75 °

Fig. 3.50. Profile of a saddle of the final valve: z — the privalochny plane of a head of the block of cylinders; a = 33,5 mm; c = 2,0–2,5 mm; a = 45 °; b = 30 °; g = ° ° °

Fig. 3.19. Distance from a valve rod end face to the top surface of a head of the block of cylinders

Profiles of saddles of valves are shown in fig. 3.49 and 3.50 .

Minimum admissible distance of A (see fig. 3.19 ) from an end face of a rod of the inlet valve to the top plane of a head of the block of cylinders makes 33,9 mm, the final valve – 34,1 mm.

Fault detection of details of the valvate mechanism is carried out in the sequence described in subsection 3.1.7.

Assembly of a head of the block of cylinders is carried out in the following order:

– collect valvate mechanisms (see subsection 3.1.7);

– establish previously greased hydraulic pushers on the places in a head of the block of cylinders;

– oil necks of camshafts pure engine and install camshafts in a head of the block of cylinders;

– turn camshafts so that cams of the drive of valves of cylinders No. 1 and 2 were directed up;

– grease working surfaces of covers of bearings of camshafts with pure engine oil;

– establish covers of bearings No. 3 and 5 (see fig. 3.48 );

NOTE Shooters on all established covers have to be directed to a forward part of the engine.

– tighten nuts of fastening of covers of bearings No. 3 and 5 the moment of 20 N · m, turning their every time serially cross-wise on a half of a turn;

– establish covers of bearings No. 1 and 7 and tighten nuts of fastening of covers the moment of 20 N · m;

– establish covers of bearings No. 2 and 6 and delay fastenings of covers the moment of 20 N · m, turning them serially cross-wise on a half of a turn for one pass;

– establish a cover of the bearing No. 4 and tighten nuts of fastening of a cover the moment of 20 N · m;

– establish asterisks 2 (see fig. 3.47 ) camshafts on the places tighten bolts 4 fastenings of asterisks the moment of 100 N · m, holding camshafts from a provorachivaniye a wrench;

Fig. 3.43. Head of the block of cylinders of the AAA engine: 1 – cover of a head of the block of cylinders; 2 – nut of fastening of a cover of a head of the block of cylinders; 3 – laying of a cover of a head of the block of cylinders; 4 – camshaft bearing cover; 5 – head of the block of cylinders; 6 – GRM drive cover; 7 – bolt of fastening of a cover of the GRM drive; 8 – laying of a head of the block of cylinders; 9 – bolts of fastening of a head of the block of cylinders

– apply a thin film of sealant on the cleared interfaced surfaces of a cover 6 (see fig. 3.43 ) the GRM drive and a head of the block of cylinders, establish a cover 6 and tighten bolts of the 7th fastening of a cover;

– install the ignition distributor;

– execute other operations in the sequence, the return to removal.