BMW 5 series E39

Since 1996-2001 of release

Repair and car operation

+ Introduction
+ The maintenance instruction
+ Current leaving and service
+ The engine
+ Systems of cooling, heating
+ The power supply system and release
- Engine electric equipment
   - Ignition system
      Security measures at work with ignition system
      Removal and installation of the coil of ignition
      Removal and installation of the gauge of a detonation
      Check and replacement of the gauge of impulses
      Removal and installation of the tip of a spark plug
      Removal and installation of the block of management DME
      Spark plugs
   + System of preheat of the diesel engine
   + Charge and start systems
+ Manual transmission
+ Automatic transmission
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ Electric equipment schemes
+ System of onboard diagnostics

Spark plugs

The general description and parametres

Spark plugs have the size on a turn-key basis 16 mm. Manufacturers recommend candles of certain type, however it is possible to use suitable candles with corresponding калильным number of other manufacturers. It is necessary to replace spark plugs through each 20 000 km or 2 years. Before вывинчиванием candles check up, that in niches of candles there were no extraneous subjects. Got to apertures of candles of a washer, bolts or stones will destroy valves, saddles of valves or a head of cylinders at the first start of the engine.

The spark plug consists of the central electrode, an insulator with the case and a lateral electrode. The central electrode is tightly connected with an insulator, the insulator is strongly connected with the case. The spark is formed between central and lateral electrodes. Idling characteristics depend on a spark plug, acceleration and the maximum speed of the car starting readiness. Thereof it is not necessary to apply the candles which are distinct from what are recommended by manufacturer. Spark plug key parametre is калильное number. It characterises thermal loading ability of a candle under certain conditions operation. Candles are chosen in such a manner that they at all possible service conditions reach self-cleaning temperatures. The more low калильное candle number, the above its resistance in relation to калильному to ignition and those above resistance to pollution.

The kalilnoe number is underlined in a candle code. The code has the following structure:

For example

Candles Bosch

F 8 L


1 2 3

4 5 6

1 — W - a carving of M 14 х 1.25 with flat consolidation, on a turn-key basis 21; F - a carving of M 14 х 1.25 with flat consolidation, on a turn-key basis 16; H - a carving of M 14 х 1.25 with конусным consolidation, on a turn-key basis 16.

2 — Kalilnoe number. Can be from 06 ("a cold" candle) to 13 ("a warm" candle). Thus number 8 corresponds калильному to number 150 (a former designation), 7 - 175, 6 - 200 etc.

3 — B - length of a carving of 12.7 mm, выступание a thermal cone of an insulator for a case end face; With - length of a carving of 19 mm, normal position of a thermal cone; D - length of a carving of 19 mm, выступание a thermal cone of an insulator; L - length of a carving of 19 mm, raised выступание a thermal cone.
Data about length of a carving concerns candles with flat consolidation. In addition “T” (for example, “DT”) - 3 electrodes of weight.

4 — electrode Execution

5 — the Material of the central electrode: without the data - хромоникелевый an alloy, With - a medno-nickel alloy, S - silver, З - platinum.

6 — With помехоподавляющим resistance.

Applied for BMW 5th series of a spark plug are resulted in Specifications.

In the course of technical development there can be new types of candles. Consultation about characteristics of candles can be received in specialised workshops.

Condition of candles as the characteristic of quality of work of the engine

On appearance of a candle it is possible to draw a conclusion on work of candles, adjustment of system of injection, quality of a mix and deterioration of the engine (pistons, piston rings etc.) Address to photographic inserts.

At ввинчивании candles watch, that they have not been drawn, as the sealing washer can be damaged. Do not exceed the moment of an inhaling of 25 Nanometers.


Coal adjournment

Symptoms: soot Presence specifies in reenrichment of a toplivno-air mix or weak intensity of a spark. Causes ignition admissions, complicates start and leads to instability of work of the engine.
Recommendations: whether Check up the air cleaner is hammered, whether fuel level in поплавковой to the chamber is not too high, whether is jammed air заслонка and whether contacts are not too worn out. Try to use candles with longer insulator that raises resistibility


Symptoms: zamaslivanie candles it is caused by deterioration маслоотражательных caps. Oil gets to the combustion chamber through worn out directing valves or piston rings. Causes ignition admissions, complicates start and leads to instability of work of the engine.
Recommendations: Make a mechanical recovery work and replace candles.


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

Too early ignition

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

Electrospending luster

Symptoms: the Insulator has yellowish colour and the polished kind. Speaks about sudden rise in temperature in combustion chambers at sharp acceleration. Usual adjournment 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: the Waste of products of combustion gets to interelectrode space. Firm adjournment accumulate, forming a crosspiece between electrodes. Leads to ignition refusal in the cylinder.
Recommendations: Remove adjournment from interelectrode space.

Candle normal state

Symptoms: Gray-brown colour and easy deterioration of electrodes. The kalilnoe number of candles corresponds to type of the engine and its general condition.
Recommendations: At replacement of candles establish candles of the same type.


Symptoms: Soft brownish colour of adjournment on one or both electrodes of a candle. A source of their formation are applied additives to oil and-or fuel. Excessive accumulation can lead to isolation of electrodes and cause admissions of ignition and astable work of the engine at acceleration.
Recommendations: At fast accumulation of adjournment change маслоотражательные caps that will prevent oil hit in combustion chambers. Try to replace fuel mark.


Symptoms: the Rounding off of electrodes with a small congestion of adjournment on the working end. Colour normal. Leads to difficulty of start of the engine in cold damp weather and to increase of the expense of fuel.
Recommendations: Change candles on new, the same type.


Symptoms: Insulators can appear chopped off or треснутыми. The inaccurate technics of adjustment of a candle backlash can result In insulator damage also. Can lead to damage of pistons.


Symptoms: After admissions of ignition during a long time interval 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 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
As service life of candles usually makes 15 000 km, it is enough to clear of them through each 8000 km of run.