Removal, check of a technical condition and installation 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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4.8.6. Removal, check of a technical condition and installation of camshafts

For removal of camshafts it is necessary to execute operations on removal of a chain and asterisks of a drive of camshafts (see above).
Further it is necessary to start removal of covers of support of camshafts. Be convinced available labels on chains of a drive and asterisks. In the absence of such labels establish the piston of the first cylinder in VMT of a step of compression and put with label paint for combination of a link of a chain and a point on an asterisk. For big reliability it is possible to adhere each asterisk a wire to a chain.

Fig. 2.57. An arrow on a cover of a support of a camshaft


Mark covers of support before their removal. The arrow not to a cover of a support should be turned towards a chain of a drive of camshafts (fig. 2.57).
The letter "I" (INLET) is put on surfaces of covers of support of a shaft of inlet valves.

Fig. 2.58. Order of an inhaling of bolts of fastening of support of camshafts


In sequence, return shown on fig. 2.58, weaken on one turn bolts of fastening of covers of camshafts, gradually reducing these pressure of springs of valves. Completely turn out and take out fastening bolts. Mark each bolt as they have different length.
Remove the maslootrazhayushchy screen and an oil pipeline. Remove covers of support and take out camshafts.
Check a condition of details. On a surface of contact of a head of the block of cylinders with covers of support risks, teases and so forth are not allowed.
Examine camshafts. On cams there should not be a facet, step and non-uniform wear, overheat traces (color of a pobezhalost) and other defects of a surface. Measure height of cams and diameter of necks of shaft. Measure radial palpation of camshafts, having established them on prisms.
Gap measurement in support of shaft is carried out by means of the special plastic calibrated wire as it is described for definition of gaps in bearings of a cranked shaft.
Results of measurements compare to the values given in the main specifications.

Fig. 2.59. Extraction of the lever of the valve


Fig. 2.60. Extraction of hydropushers from a head of the block of cylinders


At the removed camshafts it is desirable to check a technical condition of hydraulic pushers. For this purpose remove the valve lever from a head of the block of cylinders (fig. 2.59) and take out (without resorting to the help of a magnet) a hydropusher from an opening in a head of the block of cylinders (fig. 2.60).
Lay details according to their arrangement in boxes (cells). Remove a washer and directing plug from a core of the valve and put them together with the lever of the valve. Repeat these operations for all levers of valves, the hydropushers, directing plugs and washers.
Check basic surfaces of levers of valves, the hydropushers, directing plugs and a head of the block of cylinders; on them there should not be wear tracks and damages (задиров, scratches, забоин). Worn-out details replace.
Before installation of hydropushers check size of wear of the washers established on an end face of valves. For this purpose establish directing plug on an end face of that valve from which it was removed.

Fig. 2.61. Installation of the indicator of hour type on a basic surface of the directing plug


Fig. 2.62. Turn of the indicator and installation of its head on an end face of a core of the valve


Fix the indicator of hour type on a head of the block of cylinders and bring its measuring core to a basic surface of the directing plug (fig. 2.61), i.e. in a cut of the directing. Establish in this situation an indicator scale on a zero. Turn the indicator (having raised a measuring core) so that the measuring core rested against an end face of a core of the next valve of the same cylinder (fig. 2.62). Watch that the indicator support at measurement did not move. Calculate a difference of heights between an end face of a core of the valve and a basic surface of the directing plug and write down result. Return the indicator to initial situation and establish a measuring core on a basic surface of the directing plug. The arrow of the indicator should show a zero.
Execute measurements for each pair of inlet and final valves of each cylinder and write down results. On the basis of results of the specified measurements pick up washers of the necessary thickness for each pair of valves. The admission for thickness of a washer makes ±0,025 mm. Washers let out in the thickness from 2,800 to 3,200 mm with an interval of 0,025 mm. The size is specified on a reverse side of a washer (so, «2875» designates that thickness of a washer of 2,875 mm). For measurement of thickness of the removed washer and determination of its wear it is possible to use a micrometer.

Fig. 2.63. Installation of washers and directing plugs on valves


Put on washers valves (fig. 2.63). Watch that the marked parties of washers were turned down.
Before installation of hydropushers it is necessary to check them on availability of air in a cavity. Establish a hydropusher vertically and press it. Moving of a plunzher on size more than 1 mm means availability of air in a hydropusher. In this case, and also at installation of a new hydropusher it is necessary to pump over it.

Fig. 2.64. Hydropusher pumping: 1 — a valve ball; 2 — a core; 3 — a plunzher


Insert into an opening of a plunzher of a hydropusher a metal core of suitable diameter. Place a hydropusher in vertical situation in a vessel filled with pure engine oil (fig. 2.64). Having pressed a core, drown a valve ball then slowly several times press on a plunzher before the termination of an exit of vials of air. Repeat this operation several times and be convinced of lack of air in a hydropusher. Establish hydropushers in openings in a head of the block of cylinders. Establish washers and directing plugs on valves. Establish levers of valves.

Fig. 2.65. Installation of camshafts in a head of the block of cylinders. Shooters showed adjusting pins


Fig. 2.66. Hermetic drawing on a cover of a support of a camshaft of final valves (the shaded area)


Grease with pure engine oil of a support of camshafts and establish camshafts. Be convinced that the piston of the first cylinder of the engine is in VMT of a step of compression. Establish camshafts so that ledges of cams of the first cylinder were directed up. The adjusting pin on distributive to a shaft of inlet valves should be in situation «10 hours», whereas an adjusting pin of a camshaft of final valves — in situation «12 hours» (fig. 2.65). To put a hermetic layer on a surface of interface of a cover of a support on the back end of a camshaft of final valves (fig. 2.66). On the labels made before removal, establish covers of support on the places. Be convinced that shooters on covers are directed towards a drive chain. Establish the screen on a cover of the No. bearing 2 camshafts of final valves. Establish on the places an oil pipeline and bolts of fastening of covers of support and tighten them by hand. Tighten on one turn bolts of fastening of covers of support of a camshaft of inlet valves in the sequence specified fig. 2.58. Thus covers should concern a surface of a head of the block of cylinders. Tighten the set moment all bolts of fastening of covers. In the same way tighten bolts of fastening of covers of a camshaft of final valves. Establish a chain of a drive of camshafts and an asterisk. Be convinced of the correct arrangement of labels on asterisks and a drive chain. Establish bolts and washers of fastening of asterisks and tighten bolts the set moment. Establish the ignition distributor. Attach to the storage battery a "minus" wire.

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4.8.5. Check of a technical condition and installation of a head of the block of cylinders
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4.9. Cooling system