Removal
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THE NOTE
Axial люфт camshafts check before their removal.
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Removal make in a following order:
– Switch off ignition and disconnect a wire of "weight" from the storage battery;
– Uncover heads of the block of cylinders;
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Fig. 3.52. Label combination on гасителе fluctuations with sign ВМТ or 0 on a forward cover of a chain
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Fig. 3.55. Combination of labels on asterisks of camshafts with labels on covers of bearings of camshafts (on distributive the knot of a pulley / of a drive of system VVT is visible to a shaft of inlet valves)
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– Establish the piston of the first cylinder in
ВМТ in a compression step, thus the label on
гасителе fluctuations should be combined with sign
ВМТ or 0 on a forward cover of a chain (sm
fig. 3.52), and labels on asterisks of camshafts should be combined with labels on covers of bearings of camshafts (
fig. 3.55 see
);
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Fig. 3.70. Places of drawing of adjusting labels on a chain, opposite to labels on asterisks of camshafts
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– A paint put on a chain the adjusting labels located opposite to labels on asterisks of camshafts (
fig. 3.70);
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THE NOTE
On asterisks of camshafts are available on two labels. One labels are intended for installation of camshafts in ВМТ the piston of the first cylinder, and others for combination with colour labels of a chain.
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Fig. 3.61. Use of keys for deduction of a camshaft from проворачивания and отворачивания a bolt of fastening of an asterisk
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– Keeping a wrench, a camshaft from
проворачивания for
шестигранник, turn out on some turns a bolt of fastening of an asterisk to a camshaft (
fig. 3.61 see
);
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Fig. 3.56. An arrangement of bolts of fastening of the mechanism of a tension of a chain
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– Remove the mechanism of a tension of a chain and the gauge of an angle of rotation of a cranked shaft from a forward cover of a chain (
fig. 3.56 see
);
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Fig. 3.57. An arrangement of nuts of fastening натяжителя chains
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– Turn out nuts and remove
натяжитель chains from the back party of a cover (
fig. 3.57 see
);
– Turn out bolts of fastening of asterisks to camshafts. Remove a chain from asterisks of camshafts and remove asterisks;
– Check up an axial backlash of camshafts. Establish on the block of cylinders of the engine an arm with the indicator of hour type so that the measuring tip of the indicator rested against a camshaft end face;
– Move a camshaft along an axis to one party against the stop and establish the indicator on 0. Move a camshaft along an axis to other party against the stop and fix value on the indicator. If the size of a backlash of a camshaft of inlet valves exceeds admissible size, check up a condition of the bearing №1 camshafts. If the working surface of the bearing is worn out, replace the bearing. If the size of a backlash of a camshaft of final valves exceeds admissible size, it is necessary to replace a camshaft and / or a head of the block of cylinders;
– Check up, whether there is a valve of system of change of phases timing (VVT) on a back part of a camshaft of inlet valves;
– After removal of asterisks extend, on as much as possible, a chain, and a soft wire fix it on a partition of a motor compartment. It will exclude chain falling in the engine at performance of following operations. Also put pure rags from above in a chain cover;
– Check up presence of labels on covers of bearings of camshafts. Covers are numbered by figures from 1 to 5 and letters I and E.Bukva I (Intake) specifies that the cover is established on a camshaft of inlet valves, and Е (Exhaust) – final valves. Also on covers there are arrows who at installation of covers should be directed to a chain;
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Fig. 3.75. Sequence of a tightening of bolts of fastening of covers of bearings of camshafts
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– In sequence, return to a tightening, gradually
loosen the, and then for some passes turn out completely bolts of fastening of covers of bearings of camshafts (
fig. 3.75 see
);
– Remove covers of bearings and camshafts from a head of the block of cylinders. Note position of camshafts as at installation they should be in the same positions;
– Wipe from oil and mark pushers, the magnetised tool remove them from a head of the block of cylinders and arrange so that at installation they were established on the places.
Check
Visually investigate cams and necks of bearings of camshafts on absence of development, corrosion traces, наволакивания metal and colours побежалости, testifying to a local overheat.
Check up a condition of teeths on asterisks. Teeths on an asterisk have the symmetric form and in case of development on the one hand asterisk teeths it is necessary to replace together with a chain.
Check up a condition of bearings of camshafts in a head of the block of cylinders on absence of traces of corrosion, scratches and deterioration.
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Fig. 3.71. An arrangement of the bearing №1 camshafts of inlet valves and a place (1) on which marks are put
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If working surfaces of the bearing №1 camshafts of inlet valves are damaged, replace it according to the data resulted in
table 3.28 (fig. 3.71);
By micrometer measure diameter of each neck of bearings of a camshaft and write down values. Necks measure in several points, both on diameter, and on length, it will allow to reveal ovality and конусность at their presence. Rating value of diameter of necks of bearings of a camshaft: the bearing №1–35,971–35,985; the others – 22,959–22,975 mm. If diameter of any neck is less than rating value, replace a camshaft.
Establish covers of bearings of camshafts on a head of the block of cylinders and fix bolts. Measure internal diameter of each corresponding bearing of a camshaft and write down values. For definition of a radial backlash subtract from diameter of the bearing diameter of a corresponding neck of a camshaft. Compare size of a backlash to specifications. If the backlash exceeds maximum permissible value, replace a camshaft and / or a head of the block of cylinders.
By micrometer measure height of cams of a camshaft. Compare height of cams to specifications. If height of cams less than maximum permissible value, replace a camshaft.
Measure radial palpation of a camshaft. Establish a camshaft in a head of the block of cylinders. Establish on a head of the block of cylinders an arm with the indicator of hour type so that the measuring tip of the indicator rested against an average neck of a camshaft, and establish the indicator on 0. Slowly turn a camshaft and note change of indications of the indicator.
Move a camshaft along an axis to other party against the stop and fix value on the indicator. Maximum permissible value of radial palpation of 0,03 mm. If radial palpation more than maximum permissible value, replace a camshaft.
Check up each pusher on absence of deterioration and задиров.
Measure external diameter of each pusher, and corresponding nests of pushers. For backlash definition subtract diameter of a pusher from diameter of a nest. Rating value of a backlash of 0,033-0,059 mm, maximum permissible value – 0,079 mm. If the backlash exceeds maximum permissible value, replace pushers.
Installation
Installation make in a following order:
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Fig. 3.72. Installation of the bearing №1 camshafts of inlet valves in a head of the block of cylinders
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Fig. 3.73. Installation of the bearing №1 camshafts of inlet valves in a bearing cover
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– If acted in film the bearing №1 camshafts of inlet valves, establish it in a head of the block of cylinders (
fig. 3.72) and a bearing cover (
fig. 3.73);
– Grease with engine oil pushers and establish them on places in which they were before removal;
– Grease with engine oil of a neck and camshaft cams;
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Fig. 3.74. Installation of cams of the first cylinder
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– Establish camshafts so that cams of shaft of the first cylinder have been directed every which way from each other, at an angle 30 upwards from a horizontal plane (
fig. 3.74), and adjusting pins have been directed upwards;
– Establish covers of bearings of camshafts and fix their bolts, having tightened them by hand at this stage;
– In the sequence shown in drawing
3.75, turning for one pass on 1/4 turns, screw bolts of fastening of covers and tighten their moments resulted in specifications;
– Combine teeths of an asterisk of camshafts with chain links, having combined the labels put before removal, and establish asterisks on camshafts so that pins of shaft have entered into apertures from an underside of asterisks;
– Check up that the piston of the first cylinder is established in
ВМТ in a compression step, thus the label on
гасителе fluctuations should be combined with sign
ВМТ or 0 on a forward cover of a chain (
fig. 3.52 see
), and labels on asterisks of camshafts should be combined with labels on covers of bearings (
fig. 3.55 see
). Be convinced that adjusting labels on a chain before removal, are located opposite to labels on asterisks of camshafts (
fig. 3.70 see
);
– By turns, keeping a wrench, a camshaft from
проворачивания for
шестигранник, screw bolts of fastening of asterisks to camshafts (
fig. 3.61 see
);
– Establish натяжитель chains.
The further installation spend to sequences, return to removal.