2.2.9. Cleaning and check of a condition of a head of cylinders and components
Careful cleaning of a head (heads) of cylinders and the related components of the valve with the subsequent detailed check of a state will allow to define what amount of works with valves should be executed at capital repairs of the engine.
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If the engine tested a strong overheat, then the head of cylinders is probably bent (watch item 4).
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Cleaning
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- Remove with a scraper from the condensed surfaces of a head of cylinders, the inlet pipeline and a final collector all remains of old laying and a sealing compound. Observe extra care not to damage a head of cylinders. In shops of auto parts it is possible to buy special solvents for removal of laying.
- Remove from channels of cooling everything sedimentation.
- Rigid brush clean various openings to remove sedimentation which could appear in them.
- For removal of corrosion and carving sealant which can be present at carving openings clean them taps of the corresponding size. If compressed air is available, after this operation clear with its help openings of garbage.
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When using compressed air apply goggles. |
- Clear solvent a head of cylinders and carefully dry. Compressed air will accelerate process of drying and will provide purity of openings and deepenings.
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There are chemical means for removal of a deposit and they can be very useful when cleaning heads of cylinders and components of knots of valves. However, these means very aggressive and them should be applied with care. Follow instructions on their packings. |
- Clear solvent shaft yokes/yokes/pushers, springs, springs of valves, holders and crackers, and then carefully dry them. Not to mix components of valves, clear valves in turn.
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Do not clear M40 engine hydropushers; leave them completely shipped in oil. |
- Remove a scraper from valves everything sedimentation, and then remove with an electric brush from heads and cores of valves a deposit. Again track that components of valves were not mixed.
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Check of a state
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Before making decision on need of works for a mechanical workshop be convinced that all specified checks of a state are executed. Make the list of checks. |
Head of cylinders
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- Carefully examine a head regarding cracks, traces of leakage of a cooler and other damages. At detection of cracks address for consultation in a mechanical workshop. If repair is impossible, it is necessary to get a new head of cylinders.
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- By means of the measuring instrument of planeness and probes check existence of a curvature the condensed laying of a surface of a head. If curvature exceeds the limit given in the Size table and adjusting data at the end of the Management, then it is possible to grind it in a mechanical workshop provided that thickness of a head will not be less admissible.
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- Examine saddles of valves of each combustion chamber. If they have considerable dents, cracks or progara, then the head will demand the service which is going beyond opportunities of a house workshop.
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- Check a gap between a core of the valve and a guide, having measured by the dial indicator a side deviation of a core. The valve has to be in a guide and at the height about 2 mm over a saddle.
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