BMW 7_ая the E38 series from 1994 to 2002
1. Introduction
2. Governing bodies and operation receptions
3. Settings and routine maintenance of the car
3.1. General information
3.2. General information about settings and adjustments
3.3. Schedule of routine maintenance
3.4. Check of levels of liquids, control of leaks
3.5. Check of a condition and replacement of hoses and tubes in an impellent compartment, localization of leaks
3.6. Replacement of impellent oil and oil filter
3.7. Pro-cleaning and replacement of the fuel filter
3.8. Check of brake system and coupling
3.9. Check of a condition of system of production of the fulfilled gases
3.10. Check of a condition of components of a suspension bracket and steering
3.11. Check of a condition of protective covers of CV JOINTS of power shafts
3.12. AT transmission oil replacement
3.13. Replacement of brake liquid and pumping of brake system
3.14. Replacement of spark plugs
3.15. Replacement of the salonny filter (ventilation system)
3.16. Replacement of a filtering element of an air purifier
3.17. Replacement of cooling liquid
3.18. Check of a condition of tires and pressure of their rating
3.19. Check of a condition of the battery and care of it
3.20. Check of a condition of a belt of a drive of auxiliary units
3.21. Check of a condition of brushes of screen wipers and adjustment of nozzles of washers
3.22. Replacement of oil of the main transfer
3.23. Check of thickness of a conducted disk of coupling
4. Engine
5. Systems of cooling of the engine, heating, ventilation and air conditioning
6. A power supply system and production of the fulfilled gases
7. Systems of electric equipment of the engine
8. Manual box of gear shifting and coupling
9. Automatic transmission
10. Kardanny and power shafts, reducer, differential and stupichny assemblies
11. Brake system
12. Suspension bracket and steering
13. Body
14. Onboard electric equipment
15. Electric equipment schemes


3-14-zamena-svechejj-zazhiganiya.html

3.14. Replacement of spark plugs

It is necessary to replace spark plugs only on cold or slightly warm engine. The reversing of candles on the hot engine can entail damage of a carving to a head of cylinders.


 PERFORMANCE ORDER

  1. Switch off ignition and remove the corresponding coil of ignition (see. Head of System of electric equipment of the engine).
  2. Turn out a spark plug by means of a long face key, trying not to incline it.
  3. Estimate a condition of spark plugs (see illustrations the Condition of spark plugs). If necessary correct possible malfunctions which it is possible to judge on a condition of candles. On electrodes it is possible to remove coal deposits with the compressed air under pressure, do not use for this purpose a wire brush. Check and adjustment of an interelectrode gap in intervals between replacement of candles is not required.
  4. Establish new spark plugs and tighten them with demanded effort.
  5. Establish ignition coils.

Condition of spark plugs

Coal deposits

Symptoms: Availability of soot indicates reenrichment of a fuel and air mix or weak intensity of a spark. Causes ignition admissions, complicates start and results in instability of operation of the engine.
Recommendations: Whether check the air purifier is hammered, whether fuel level in the poplavkovy chamber is not too high, whether the air zaslonka is jammed and whether contacts are not too worn-out. Try to use candles with longer insulator that increases resilience to pollution.

Zamaslivaniye

Symptoms: Zamaslivaniye of a candle is called by wear of maslootrazhatelny caps. Oil gets to the combustion chamber through worn-out directing valves or piston rings. Causes ignition admissions, complicates start and results in instability of operation of the engine.
Recommendations: Perform mechanical recovery works and replace candles.

Overheat

Symptoms: Porous, white insulator, erosion of electrodes and absence of any deposits. Leads to reduction of service life of a candle.
Recommendations: Whether check there corresponds to requirements of Specifications kalilny number of the established candles, whether the corner of an advancing of ignition is correctly exposed, whether too poor fuel and air mix moves, whether there are no leakages of vacuum of the inlet pipeline and whether valves are jammed. Check as level of a cooler and whether the radiator is corked.

Too early ignition

Symptoms: Electrodes are melted off. The insulator has white color, but can be and is polluted owing to ignition or hit admissions in chambers of combustion of extraneous particles. Can lead to an engine exit out of operation.
Recommendations: Check kalilny number of the established candles, a corner of an advancing of ignition, quality of a mix (whether it is not too grown poor), whether the system of cooling is corked and whether the greasing system normally functions.

Electrocarrying-out luster

Symptoms: The insulator has yellowish color and the polished appearance. Speaks about sudden temperature increase in combustion chambers at sharp acceleration. Usual deposits are thus melted off, taking a form of a varnish covering. Leads to ignition admissions at high speeds of movement.
Recommendations: Replace candles (colder, at preservation of a manner of driving).

Short circuit of electrodes

Symptoms: A waste of products of combustion gets to interelectrode space. Firm deposits accumulate, forming a crossing point between electrodes. Leads to ignition refusal in the cylinder.
Recommendations: Remove deposits from interelectrode space.

Normal state of a candle

Symptoms: Gray-brown color and easy wear of electrodes. Kalilnoye number of candles corresponds to type of the engine and its general condition.
Recommendations: At replacement of candles establish candles of the same type.

Peploobrazovaniye

Symptoms: Soft brownish color of adjournment on one or both electrodes of a candle. A source of their education are applied additives to oil and/or fuel. Excessive accumulation can lead to isolation of electrodes and cause admissions of ignition and unstable operation of the engine at acceleration.
Recommendations: At fast accumulation of deposits change maslootrazhatelny caps that will prevent oil hit in combustion chambers. Try to replace fuel brand.

Wear

Symptoms: A rounding off of electrodes with a small congestion of deposits on the working end. Color normal. Leads to difficulty of start of the engine in cold damp weather and to fuel consumption increase.
Recommendations: Change candles on new, the same type.

Detonation

Symptoms: Insulators can appear chopped off or burst. Also inaccurate equipment of adjustment of a candle gap can lead to damage of an insulator. Can lead to damage of pistons.

Zabryzgivaniye

Symptoms: After ignition admissions during a long period of adjournment can be loosened at preservation of working temperature in the combustion chamber. At high speeds of adjournment in flakes come off the piston and stick to a hot insulator, causing ignition admissions.
Recommendations: Replace candles or smooth out and establish into place the old.

Mechanical damages

Symptoms: Can be caused by hit of extraneous materials in the chamber of combustion or arise at piston blow about too long candle. Lead to refusal of functioning of the cylinder and to piston damage.
Recommendations: Remove from the engine extraneous particles and/or replace свеяи.


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