Removal and installation of a chain of a drive of camshafts. Nissan Almera (from 1995 to 1999 of release)
Nissan Almera service from 1995 to 2000 in N15 body
1. General information
2. The general requirements to car repairs
3. Operation and car maintenance
4. Petrol engines
4.1. Removal and installation of the power unit
4.2. Dismantling and engine assembly
4.3. Block of cylinders
4.4. Shatunno-porshnevaya group
4.5. Cranked shaft and flywheel
4.6. Gazoraspredeleniye mechanism
4.7. Head of the block of cylinders of GA14DE and GA16DE engines
4.8. Head of the block of cylinders of the SR20DE engine
4.8.1. Removal and installation of a cover of a head of the block of cylinders
4.8.2. Removal and installation of a forward cover of a drive of the mechanism of a gazoraspredeleniye
4.8.3. Removal and installation of a chain of a drive of camshafts
4.8.4. Removal of a head of the block of cylinders
4.8.5. Check of a technical condition and installation of a head of the block of cylinders
4.8.6. Removal, check of a technical condition and installation of camshafts
4.9. Cooling system
4.10. Greasing system
4.11. System of production of the fulfilled gases
4.12. Power supply system
4.13. Complex control system of the engine (KSUD)
5. Diesel engines
6. Transmission
7. Running gear
8. Steering
9. Brake system
10. Electric equipment
11. Body
12. Appendices
13. Electric equipment schemes
 







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4.8.3. Removal and installation of a chain of a drive of camshafts


Fig. 2.14. Details of a drive of the mechanism of a gazoraspredeleniye of the SR20DE engine: 1 — an asterisk of an inlet camshaft; 2 — a bolt of fastening of the top directing chain; 3 — camshafts; 4 — top directing to a chain; 5 — a sealing ring; 6 — the block of cylinders; 7 — an asterisk of a final camshaft; 8 — a bolt of fastening of an asterisk of a camshaft; 9 — a chain of a drive of camshafts; 10 — a lobby directing to a chain; 11 — an asterisk of a cranked shaft; 12 — a bolt of fastening of a forward directing chain; 13 — the plug of a drive of the oil pump; 14 — a bolt of fastening of a cover of a drive of camshafts; 15 — a pulley of a cranked shaft; 16 — a bolt of fastening of a pulley of a cranked shaft; 17 — a cover of a drive of camshafts; 18 — a pin bolt; 19 — laying; 20 — a sealing ring; 21 — a natyazhitel of a chain; 22 — a bolt and a nut of a natyazhitel of a chain; 23 — a boot of a natyazhitel


The device of a drive of camshafts of the SR20DE engine is shown on fig. 2.14.

Removal
For removal establish the piston of the first cylinder in VMT of a step of compression. Uncover heads of the block of cylinders. Uncover a drive of the mechanism of a gazoraspredeleniye. Remove the oil filter. Turn out fixing bolts and nuts and remove a natyazhitel of a chain of a drive from a back part of a head of the block of cylinders. Remove from a natyazhitel a sealing ring and laying.

Fig. 2.44. Removal of the top directing chain of a drive


Fig. 2.45. Removal of a boot of a natyazhitel


Fig. 2.46. Removal of a forward directing chain of a drive


Fig. 2.47. Blocking from rotation by a camshaft wrench


Turn out bolts of fastening and remove top directing to a drive chain from the top part of a head of the block of cylinders (fig. 2.44). Turn out a pin bolt and remove a boot of a natyazhitel from an engine case (fig. 2.45). Turn out bolts of fastening and remove a lobby directing to a chain of a drive of camshafts (
fig. 2.46). Turn out bolts of fastening of asterisks of camshafts, previously having blocked from rotation camshafts by means of a wrench established on лыски on the right side of each camshaft (fig. 2.47). Take out bolts of fastening of asterisks together with washers. Remove asterisks from the ends of camshafts. Remove a chain of a drive of camshafts from asterisks and take out from the block of cylinders of the engine. If necessary it is possible to remove an asterisk of a cranked shaft.

       NOTE
Do not turn a cranked shaft of the engine at the removed chain of a drive of camshafts.


Fig. 2.48. Asterisk installation on a cranked shaft


Examine a teeth of asterisks and camshafts. On them there should not be wear tracks and damages. Examine links of a chain of a drive: on rollers there should not be wear tracks or damages. Degree of wear of a chain is determined by existence of a big lateral gap.

Fig. 2.49. Marking of a chain of a drive of camshafts



Examine directing chains: on them there should not be wear tracks or забоин from chain blows. Before installation be convinced that the cranked shaft of the engine was established in situation at which the piston of the first cylinder is in VMT of a step of compression, and establish a shponka in a groove of a cranked shaft. The Shponochny groove on cranked to a shaft should be in situation «12 hours». Put on an asterisk a sock of a cranked shaft (fig. 2.48). The chain of a drive of camshafts has three links, differing on color from other links: one link is put on an asterisk of a cranked shaft and two links are established on asterisks of camshafts (fig. 2.49).
On some models of the engine links of a chain which are put on asterisks of camshafts, differ on color from a link which is established on an asterisk of a cranked shaft.

Fig. 2.50. Installation of a link of the chain differing on color from other links, opposite to a label on an asterisk of a cranked shaft


Arrange the links differing on color, from outer side; put on a chain an asterisk of a cranked shaft, establishing the corresponding link against a label of initial adjustment of the mechanism of the gazoraspredeleniye, being on an asterisk (fig. 2.50). Turn asterisks of camshafts in situation at which labels of initial adjustment of the mechanism of a gazoraspredeleniye will be outside.

       NOTE
Asterisks of camshafts are interchangeable.


Fig. 2.51. Installation of a link of the chain differing on color from other links, opposite to a label on an asterisk of a camshaft of final valves


Fig. 2.52. Installation of a link of the chain differing on color from other links, opposite to a label on an asterisk of a camshaft of inlet valves


Put on a chain asterisks of camshafts. Establish the links of a chain differing on color, against labels of initial adjustment of the mechanism of a gazoraspredeleniye (fig. 2.51, 2.52). Establish pins (if they acted in film) in openings of camshafts and arrange asterisks so that their grooves coincided with adjusting pins. Be convinced that links of a chain differing on color are opposite to labels of initial adjustment of the mechanism of a gazoraspredeleniye which are located on asterisks. Otherwise remove a chain from an asterisk and rectify mutual situation of labels and links of a chain differing on color.
After the correct installation of labels insert bolts with washers of fastening of asterisks of camshafts and tighten bolts the set moment, blocking a wrench camshafts from rotation. Establish a lobby directing to a chain on a case and tighten bolts of fastening the set moment. Establish a boot of a natyazhitel of a chain and tighten a pin bolt the set moment.
Establish top directing to a chain on the top part of a head of the block of cylinders and tighten bolts of fastening the set moment.

Fig. 2.53. Natyazhitel of a chain: 1 — the lever of release of pressure of a plunzher of a natyazhitel; 2 — a cracker of blocking of a core of a plunzher


Wring out the lever of release of pressure of a plunzher of a natyazhitel, then press on a plunzher so that it entered into the case (fig. 2.53). Hold a plunzher in the pressed situation to enter into gearing a cracker and a core of a plunzher.

Fig. 2.54. Installation of a natyazhitel assembled on a head of the block of cylinders. The arrow should be directed aside from a head of the block of cylinders


Establish a new washer of a natyazhitel and a new sealing ring in a flute on the case of a natyazhitel. Establish into place a natyazhitel. Watch that the arrow was directed aside from a head of the block of cylinders (fig. 2.54). Establish nuts with washers of fastening of a natyazhitel and tighten the set moment. After an inhaling of nuts the cracker automatically leaves gearing with a core and the plunzher is released.
Execute further assembly operations as it should be, the return to removal.

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4.8.2. Removal and installation of a forward cover of a drive of the mechanism of a gazoraspredeleniye
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4.8.4. Removal of a head of the block of cylinders