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2-2-8-razborka-golovki-cilindrov.html
2.2.8. Dismantling of a head of cylinders
Engines M10, М20 and М30
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- Adjust all valves on the maximum gap, rotating the clown on the klapanny party of a yoke towards the head center (if necessary address to Head Routine maintenance of the car).
- Before removal of a persistent plate measure axial люфт a camshaft, having established the tsiferblatny indicator on the forward party of a head of cylinders, and щуп having arranged on a camshaft. Move a camshaft in a cylinder head forward - back. The indicator indication also will be axial lyufty.
- Compare indications to the values given in the Size table and adjusting data at the end of the Management.
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- Unscrew bolts and remove a persistent plate of a camshaft.
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There are two various provisions of a persistent plate. On engines M10 and М30 it is fixed in a forward part of a head of cylinders to a flange of a cogwheel of a gazoraspredeleniye. On engines M20 and М40 the persistent plate is located in a head near shaft of yokes in a forward part of a head of cylinders. |
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- Remove from a back surface of a head of cylinders a cover - at removal of a cover remember an arrangement of all laying, washers and epiploons.
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- Remove from yokes lock clips.
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There are some types of clips. Wire clips are established from both parties of a yoke; the spring clip is established on a yoke and covers it on the one hand. |
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- Before removal of shaft of yokes measure radial gaps of yokes, using the tsiferblatny indicator, and compare results to the values given in the Size table and adjusting data at the end of the Management. Turn in both parties a yoke on a shaft without its sliding along a shaft. Full scope on the end of a yoke turned to a camshaft, will be a radial gap. If a gap too big, that is necessary to replace the plug of a yoke or a shaft of yokes, or and another.
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- Remove in a forward part of a head of cylinders lock rubber or carving caps, depending on application. In a forward part of each shaft of yokes there is a cap.
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If on the engine in a forward part of shaft of yokes the made caps are established, for their removal send a head of cylinders in a mechanical workshop to avoid damage of a head of cylinders or shaft of yokes. |
- Rotate a camshaft before situation at which the possible majority of yokes will be free (will not compress the corresponding springs of valves).
- For other yokes which remained compressing springs of valves, BMW for pressing of yokes on springs suggests to use the special tool in the form of a fork (thereby having removed effort of a spring from a camshaft cam). If this tool is inaccessible, insert into gaps over ekstsentrikovy regulators from the klapanny party of yokes standard screw-drivers. By means of screw-drivers press yokes on springs of valves and hold them at camshaft extraction in such situation (look the following paragraph). This operation will need, at least, one assistant as it is usually necessary to compress three or four springs of valves. If the assistant is inaccessible, it is possible to try to fix a strong wire screw-drivers which compress springs of valves, on a board.
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Be convinced that the wire is reliably fixed on a board and on screw-drivers, differently screw-drivers can jump out of a head of cylinders and injure. |
- When all yokes left contact with camshaft cams, slowly and carefully take from a forward part of a head of cylinders a camshaft.
- At extraction it can be demanded to turn a camshaft.
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Be very careful, that at extraction not to scratch a neck of bearings of a camshaft. |
- After camshaft removal carefully remove shaft of yokes. On models without carving openings from the forward party of shaft take shaft through the back party of a head of cylinders, having applied a hammer and a core from a strong tree which should have diameter a little less, than a shaft of yokes.
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- For shaft of yokes with carving openings from the forward party for extraction of a shaft wrap a sliding hammer.
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- After removal from a head of cylinders of all shaft of yokes remove one behind another yokes.
- Put each yoke in the marked package that at assembly they were established on former places. At removal of shaft of yokes remember their situation. Directing flat cuts and small maslovodny openings are directed inside; big maslovodny openings are turned down towards directing valves. Also mark shaft of yokes that it was possible to establish them in a head of cylinders in former situation.
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M40 engines
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Keep a head of cylinders in vertical situation, all hydropushers will not be removed yet. If it not to execute, oil from hydropushers can flow out and they become disabled. |
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- Check, that covers of bearings of a camshaft were numbered or their situation was marked.
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- Therefore turn on and remove bolts of fastening of covers of bearings of a camshaft.
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... then remove covers of a camshaft of the M40 engine
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- Lift a camshaft from top of a head of cylinders and remove from the end turned to a gear wheel of a drive of the gas-distributing mechanism, an epiploon.
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- Prepare a box with the offices filled with impellent oil, for placement of hydropushers so that to keep them according to their arrangement. Also prepare one more box for pushers.
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... and persistent disks.
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... then take from wells in a head of cylinders hydropushers.
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All engines
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- Before removal of valves organize marking and their storage, together with the related components so that they could be stored separately and would be again established in the same directing.
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- Compress a szhimatel of a spring of the first valve and remove crackers. Carefully release a szhimatel of a spring of the valve and remove the holder, a spring and a spring saddle (if it is applied).
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- Take from a valve head, then remove with directing a maslootrazhatelny cap.
- Repeat operation for other valves. Do not forget to store all parts of one valve together that they were again established on former places.
- When valves and the related components are removed and laid in a demanded order, the head of cylinders should be cleared and examined carefully. If complete major maintenance is made, before cleaning and survey of a head finish engine dismantling.
- If the valve gets stuck in the directing (is not taken), insert it back into a head and a small file or an abrasive stone remove in a flute zone under agnail crackers.
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