Removal
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THE NOTE
At removal and installation of camshafts it is necessary to use 2 additional technological bolts М6х1 in length of 16-20 mm
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Removal make in a following order:
– Uncover heads of the block of cylinders;
– Remove the ignition distributor;
– Remove a gear belt, a pulley of a camshaft and a back casing of a gear belt;
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Fig. 3.25. Installation of the indicator of hour type for measurement of an axial backlash of a camshaft
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– Check up an axial backlash of a camshaft. 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 (
fig. 3.25);
– 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 backlash size exceeds admissible size, it is necessary to replace a camshaft and / or a head of the block of cylinders;
Camshaft of final valves
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Fig. 3.26. Position of a camshaft of inlet valves in position at which the adjusting pin (1) settles down at the left at an angle 10–45 from a vertical axis
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– Turn a camshaft of inlet valves so that the adjusting pin 1 (
fig. 3.26) settled down at the left at an angle 10–45 from a vertical axis. In this case the camshaft of final valves will turn in position at which pressure
клапанных springs on all cams of a camshaft will be uniform;
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Fig. 3.27. An arrangement of a bolt of fastening of an auxiliary gear wheel of a camshaft of final valves to the basic gear wheel
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– Additional technological bolt М6х1 attach an auxiliary gear wheel of a camshaft of final valves to the basic gear wheel (
fig. 3.27);
– Turn out 2 bolts and remove a back cover of the bearing of a camshaft;
– By turns, turning on 1/4 turns, loosen the, then turn out completely bolts of fastening of covers 1, 2 and 4 fastenings of bearings of a camshaft. Remove 1, 2 and 4 covers of bearings of a camshaft;
– By turns, turning on 1/4 turns, loosen the, then turn out completely bolts of fastening of a cover 3 bearings of a camshaft. Uncover 3 bearings of a camshaft;
– Remove a camshaft;
– For removal of a gear wheel from a camshaft of final valves fix a camshaft for шестигранник in a vice with soft sponges;
– Establish the second additional bolt М6х1 in a technological aperture of an auxiliary gear wheel of a camshaft. A screw-driver inserted between a camshaft and the second auxiliary bolt, turn an auxiliary gear wheel clockwise and turn out the first auxiliary bolt;
– Remove a spring lock ring of fastening of an auxiliary gear wheel;
– Remove a spring washer, an auxiliary gear wheel and a spring ring of a gear wheel of a camshaft.
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THE PREVENTION
At easing and a reversing of bolts of fastening of covers of bearings of a camshaft be convinced that the camshaft in regular intervals, without a warp separates from a head of the block of cylinders. Otherwise establish to the place of a cover of bearings and turn a camshaft of inlet valves so that the adjusting pin settled down at the left at an angle 10–45 from a vertical axis (fig. 3.26 see).
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Camshaft of inlet valves
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Fig. 3.28. Position of a camshaft of inlet valves in position at which the adjusting pin (1) settles down at the left at an angle 80–115 from a vertical axis
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– Turn a camshaft of inlet valves so that the adjusting pin 1 (
fig. 3.28) settled down at the left at an angle 80–115 from a vertical axis;
– Turn out bolts and remove a forward cover of bearings of a camshaft of inlet valves and a sealing ring;
– By turns, turning on 1/4 turns, loosen the, then turn out completely bolts of fastening of covers 1, 3 and 4 fastenings of bearings of a camshaft. Remove 1, 3 and 4 covers of bearings of a camshaft;
– By turns, turning on 1/4 turns, loosen the, then turn out completely bolts of fastening of a cover 2 bearings of a camshaft. Uncover 2 bearings of a camshaft;
– Remove a camshaft.
Check
Check make in a following order:
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Fig. 3.29. A place of measurement of distance between the ends of a spring of a gear wheel of a camshaft: Х = 22,5–22,9 mm
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1) measure distance between the ends of a spring of a gear wheel of a camshaft which should make 22,5–22,9 mm (
fig. 3.29). Otherwise replace a spring;
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THE PREVENTION
Do not uncover, using levers. If the cover does not act in film, leave it on a place.
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2) wipe from oil and mark adjusting washers and pushers, the magnetised tool remove them from a head of the block of cylinders and arrange them so that at installation they were established on the places;
3) check up each pusher on absence of deterioration and задиров;
4) 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 a pusher of 0,024-0,052 mm, maximum permissible value – 0,07 mm. If the backlash exceeds maximum permissible value, replace pushers;
5) visually investigate cams and necks of bearings of camshafts on absence of development, corrosion traces, наволакивание metal and presence of colours побежалости, testifying to a local overheat;
6) a micrometer measure height by a camshaft cam. Rating value of height of cams of a camshaft of inlet valves of 42,01-42,11 mm, maximum permissible value – 41,9 mm. Rating value of height of cams of a camshaft of final valves of 40,06-40,16 mm, maximum permissible value – 39,95 mm. If height of cams less than maximum permissible value, replace a camshaft.
7) by a micrometer measure diameter of each neck of bearings of a camshaft. 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 of 26,959-26,975 mm. If diameter of any neck is less than rating value, replace a camshaft;
8) check up backlashes in camshaft bearings as follows;
9) the check method consists in using a product known as Plastigage. It is the round calibrated plastic core which is compressed between a cover of the bearing and a camshaft neck. After removal of a cover of the bearing the deformed plastic core is measured by a special template which is available in complete set Plastigage.
10) procedure for use Plastigage the following:
– Clear necks of a camshaft, a cover of bearings and a camshaft installation site in a head of the block of cylinders;
– Establish camshafts in a head of the block of cylinders without greasing and pushers;
– Cut off some slices of plastic core Plastigage (they should be slightly shorter, than width of bearings) and establish them on each neck of a camshaft;
– Establish covers of the bearings which identification arrows should be directed towards a gear belt and tighten bolts of fastening by the demanded moment. A tightening of bolts spend by turns, consistently turning each bolt on 1/4 turns;
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Fig. 3.30. Measurement of width of deformed core Plastigage with use of a scale ruler
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– Turn out bolts and remove covers of bearings of camshafts. To the deformed plastic core put the scale ruler printed on packing. Comparing width of the deformed plastic core with control width on a scale ruler, define backlash size (
fig. 3.30). If a backlash more than maximum permissible value, replace a camshaft and / or a head of the block of cylinders;
– In end carefully clear traces of material Plastigage from covers of bearings and camshafts;
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Fig. 3.31. Use of the indicator of hour type (1) for measurement люфта in gear gearing of gear wheels of camshafts
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11) measure
люфт in gear gearing of gear wheels of camshafts. Establish camshafts, without establishing pushers and an auxiliary gear wheel. Establish on a head the block of cylinders an arm with the indicator of hour type 1 (
fig. 3.31) so that the measuring tip of the indicator rested in one their teeths of a gear wheel of a camshaft.
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THE PREVENTION
In the course of measurement of a backlash by method Plastigage do not rotate camshafts.
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Turn a camshaft gear wheel in one party against the stop in teeths of the second gear wheel and establish the indicator on 0. Turn a gear wheel in other party in limits люфта and fix value on the indicator. If the size люфта exceeds admissible size, it is necessary to replace camshafts.
Installation
Camshaft of inlet valves
Installation make in a following order:
– Grease with engine oil pushers and establish them on places in which they were before removal. Be convinced that adjusting washers are established on pushers;
– Grease with engine oil of a neck and camshaft cams;
– Establish a camshaft of inlet valves so that the adjusting pin settled down at the left at an angle 80 from a vertical axis (
fig. 3.28 see
);
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Fig. 3.32. Places of drawing of hermetic (1) on привалочную a surface of a forward cover of the bearing of a camshaft
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– Apply a thin film hermetic RTV 1 (
fig. 3.32) width 2–3 mm on external edges
привалочной surfaces of a forward cover of the bearing of a camshaft and immediately establish a cover;
– Establish other covers of bearings of a camshaft according to their numbering, thus the arrows put on covers, should be directed towards a gear belt;
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Fig. 3.33. Sequence of a tightening of bolts of fastening of covers of bearings of a camshaft of inlet valves
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– In sequence shown in drawing
3.33, turning for one pass on 1/4 turns, screw bolts of fastening of covers and tighten their moment 19
Nm;
– Grease with engine oil an external surface and a working edge of a new sealing ring of a camshaft. Tubular оправкой, with external diameter a bit smaller external diameter of a ring, establish a sealing ring into place.
Camshaft of final valves
Installation make in a following order:
– Repeatedly establish an auxiliary gear wheel on a camshaft of final valves. Establish a spring, an auxiliary gear wheel, a spring washer and fix their lock ring;
– Establish the first additional bolt М6х1 in a technological aperture of an auxiliary gear wheel of a camshaft. A screw-driver inserted between a camshaft and the first auxiliary bolt, turn an auxiliary gear wheel clockwise and screw and tighten the second auxiliary bolt to press an auxiliary gear wheel to a camshaft gear wheel. Remove the first auxiliary bolt;
– Grease with engine oil pushers and establish them on places in which they were before removal. Be convinced that adjusting washers are established on pushers;
– Grease with engine oil of a neck and camshaft cams;
– Establish a camshaft of inlet valves over a head of the block of cylinders so that the adjusting pin settled down at the left at an angle 10 from a vertical axis (
fig. 3.26 see
);
– Combine adjusting labels on gear wheels of camshafts of inlet and final valves and establish a camshaft of final valves in a head of the block of cylinders. For simplification of installation slightly turn a camshaft in one or other party;
– Establish covers of bearings of a camshaft according to their numbering, thus the arrows put on covers, should be directed towards a gear belt;
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Fig. 3.34. Sequence of a tightening of bolts of fastening of covers of bearings of a camshaft of final valves
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– In sequence shown in drawing
3.34, turning for one pass on 1/4 turns, screw bolts of fastening of covers and tighten their moment 19
Nm;
– Turn out the additional bolt compressing gear wheels of a camshaft of final valves;
– Establish semicircular заглушки in a head of the block of cylinders;
– Establish a back casing of a gear belt;
– Combine an adjusting pin with dredging and establish a pulley of a gear belt on a camshaft and fix a bolt, having tightened its moment 54 Nm. At a tightening of a bolt of fastening of a pulley the second key established on шестигранник, keep a camshaft from проворачивания;
– Establish a gear belt.
The further installation spend to sequences, return to removal.