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 подразд. 3.2.5);

Fig. 3.44. Inlet collector: 1–butterfly valve case; 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 bottom section of an inlet collector; 6–bolt of fastening of the bottom section of an inlet collector; 7–bottom section of an inlet collector; 8–bolt of fastening of the top section of an inlet collector

– unscrew bolts 6 (see fig. 3.44 ) fastenings of the bottom 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 maintenance 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

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

Fig. 3.47. Camshafts and mechanism of a drive of the valve: 1–camshafts; 2–asterisks of camshafts; 3–coupling of a drive of the distributor of ignition; 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-a maslosjemny cap, 11 – a head of the block of cylinders, 12 – inlet and final valves; A–shestigrannik for wrench installation for fixing of camshafts from an otvorachivaniya of bolts of fastening of asterisks

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

Fig. 3.48. Camshafts and covers of bearings of camshafts

– unscrew nuts of fastening of covers of bearings No. 1 and 7 (fig. 3.48) of a camshaft and remove covers;

– unscrew nuts of fastening of covers of bearings No. 3 and 5. Nuts it is necessary to turn on serially cross-wise on a turn half for one pass, until then while they cannot be turned on manually;

– remove covers of bearings No. 3 and 5;

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

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

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

– remove covers of bearings No. 2 and 6;

– remove a camshaft of a 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 a storage place as removal for the subsequent their correct installation on the places;

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

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

– remove the top plate 7 and springs 8 and the 9th 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 in separate plastic bags sets of klapanny mechanisms and mark packages for the subsequent correct installation of valves on the places;

– remove maslosjemny caps 10 by means of special capture.

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

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

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

Operations of fault detection of camshafts and hydraulic pushers are described in подразд. 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 подразд. 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 an end face of a rod of the valve to the top surface of a head of the block of cylinders

Profiles of saddles of valves are shown on 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 klapanny mechanism is carried out in the sequence described in подразд. 3.1.7.

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

– collect klapanny mechanisms (see подразд. 3.1.7);

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

– grease necks of camshafts with pure engine oil and establish camshafts in a head of the block of cylinders;

– turn camshafts so that cams of a 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 should 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 each time serially cross-wise on a turn half;

– 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 tighten fastenings of covers by the moment of 20 N · m, turning them serially cross-wise on a turn half 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 of 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–cover of the bearing of a camshaft; 5–head of the block of cylinders; 6–cover of a drive of GRM; 7–bolt of fastening of a cover of a drive of GRM; 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 hermetic on the cleared interfaced surfaces of a cover 6 (see fig. 3.43 ) a drive of GRM and a head of the block of cylinders, establish a cover 6 and tighten bolts of the 7th fastening of a cover;

– establish the ignition distributor;

– execute other operations in sequence, return to removal.