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2-1-11-snyatie-i-ustanovka-golovki-cilindrov.html
2.1.11. Removal and installation of a head of cylinders Removal
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- Dump pressure of fuel on all engines with system of injection of fuel (see. Head Power supply system).
- Disconnect a negative wire of the battery. Where the battery is located in an impellent compartment, it can be removed completely from the car (see. Head ignition System).
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If the radio receiver of your car is equipped with system of protection against theft, make sure that you gathered the correct code before a battery detachment. |
- Remove air purifier assembly (see. Head Power supply system).
- Disconnect conducting from the ignition distributor (if necessary at first mark an arrangement of all wires) and VV a wire from the ignition coil (see. Head ignition System).
- Disconnect a wire from the block of the sensor of temperature of a cooler (see. Head cooling System).
- Disconnect lines of supply of fuel from the fuel highway or the carburetor that is provided (see. Head Power supply system).
- Merge cooling system (see. Head cooling System).
- Accurately mark and then disconnect all other hoses from the case of a butterfly valve, the inlet pipeline, the carburetor and a head of cylinders that is provided.
- Disconnect a final collector from a head of cylinders (see. Section Removal and installation of a final collector). Depending on engine type, probably, you should not disconnect a collector from an exhaust pipe; however, on models with right-hand management an intermediate shaft the helmsman of a column can close access to screws of adjustment of gaps on a head of cylinders.
- Disconnect all remained hoses and tubes from the inlet pipeline, including vacuum tubes of an advancing of ignition, and also hoses of a heater and cooling system.
- On early carburetor models disconnect conducting from the generator and a starter.
- Remove the inlet pipeline (see. Section Removal and installation of the inlet pipeline). Do not assort and do not remove any components of system of injection of fuel without emergency.
- Remove a driving belt of the fan and the fan (see. Head cooling System).
- Uncover heads of cylinders and its laying (see. Section Removal and installation of a cover of a head of cylinders). Remove semicircular rubber consolidation from a forward part of a head of cylinders where it is not built in cover laying.
- Bring the piston No. 1 into the provision VMT of a step of compression (see. The section Reduction of the piston of the first cylinder in the provision of the top dead point (VMT)).
- Remove a distributive belt or a chain (see. Section Removal, survey and installation of a distributive chain and asterisks of its natyazhitel or Replacement of forward epiploons).
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If you want to save time on removal and installation of a distributive belt or a chain and engine redistribution, you can disconnect an asterisk of a cam-shaft and suspend it aside on a piece of a rope, without removing a chain or a belt. The rope should leave a chain or a belt strong tense that they could not come off asterisks. |
- Weaken bolts of a head of cylinders gradually, each time on a turn quarter, as it should be, the return to a tightening order (see a photo 6, 7, 8, or 9). On engines M10, М20 and М30 this time do not assort and do not remove yoke assembly.
- Remove a head of cylinders, having lifted it directly up from the block of cylinders. Do not push anything between a head of cylinders and the block of cylinders since it is possible to damage condensing surfaces of laying. Instead place a stupid core in an entrance opening softly to liberate a head.
- Remove from a head all remained external components to have possibility carefully to clean it and to examine. Procedure of service of a head of cylinders is described regarding Procedure of major maintenance of components of the engine. On M40 engines remove a rubber sealing ring from a flute in the top part of a casing oil a cover pump/lobby.
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Installation
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- At installation of a head of cylinders interfaced surfaces of a head and the block of cylinders should be absolutely pure.
- Use a scraper to remove all traces of coal and a material of old laying, then clear interfaced surfaces suitable solvent. If at head installation on interfaced surfaces there will be an oil, laying will not carry out properly consolidation function, and there can be leaks. Working with the block of cylinders, fill cylinders pure rags to prevent dirt hit in them. Delete the remains of the materials which have got to cylinders, by means of the vacuum cleaner.
- Check interfaced surfaces of a head and the block on existence of jags, deep scratches and other damages. If insignificant, them it is possible to liquidate damages by means of a file; if they are rather serious, correct them machining can only.
- Tap of the suitable size walk on a carving in openings of bolts of a head, then clean openings the compressed air - make sure that in openings remained nothing (including oil, water, etc.).
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- Experts of BMW recommend to replace head bolts but if all of you use old bolts, clamp everyone them them in a vice and walk on it a lerka. To remove traces of corrosion and to restore a carving. Dirt, corrosion, traces of hermetic and the damaged carving influences indications of effort of a tightening of bolts.
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- If bolts or their carving are damaged, use new bolts.
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- Establish all components which have been removed from a head before its cleaning and survey. On M40 engines establish a new sealing ring in a flute in the top part of a casing oil to a cover pump/lobby.
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- Make sure that sealing surfaces of laying between the block of cylinders and a head pure and fat-free. Establish head laying on the block up the party specified by the producer (usually on it «UP» is written, to "OPEN" or something similar). Use adjusting pins in the top part of the block correctly to place laying.
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- Carefully establish a head of cylinders on the block. Use directing pins for the correct alignment.
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- On models, where the engine is slightly inclined (for example, the M40 engine), can help you installation of directing cores for more exact alignment of provision of a head on the block. Use for this purpose two old bolts of the head, screwed in there and back the block. Cut off heads of bolts and a hacksaw make cuts in their tops that after installation of a head of cylinders they could be removed.
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- Get bolts of a head of cylinders.
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- Tighten head bolts in specified below sequence with demanded effort.
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Sequence of the TIGHTENING of bolts of a head of cylinders for four-cylinder M10 engines. |
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Sequence of the TIGHTENING of bolts of a head of cylinders for six-cylinder M20 engines. |
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Sequence of the TIGHTENING of bolts of a head of cylinders for six-cylinder M30 engines. |
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Sequence of the TIGHTENING of bolts of a head of cylinders for four-cylinder M40 engines. |
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- Pay attention that on some engines the final stage of a tightening occurs after engine run.
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- The rest of installation make as it should be, the return to removal. On engines M10, М20 and М30 before installation of a cover of a head of cylinders adjust gaps of valves (see. Head Routine maintenance of the car) - check them once again after engine warming up. Start the engine and check, whether there are no leaks.
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