Что делать, если стучат клапана на холодном двигателе

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Двигатель внутреннего сгорания состоит из двух основных частей – металлического блока цилиндров и головки блока. Обе эти части являются защитой для рабочих агрегатов двигателя. Внутри двигателя находится распределительный вал, поршневая группа, коленчатый вал, цилиндры и клапана. Все эти детали приводят в движение маховик, который, в свою очередь, приводит в движение механизмы коробки передач автомобиля. Представьте, что весь этот сложный механизм при высоких температурах, а также в условиях естественной вибрации вращается и двигается в поступательном ритме с огромнейшей частотой. Напряжение на каждую деталь двигателя невероятное, поэтому не удивительно, что в этом агрегате со временем начинают появляться посторонние шумы. В нашей статье мы поговорим о том, почему возникают непонятные звуки и что делать, если стучат клапана на холодном двигателе.

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Простые автолюбители, которые не сильно разбираются в сущности работы автомобильных агрегатов, но имеют «большой» водительский стаж, услышав стук в двигателе, сразу же делают вывод, что это застучали клапана. В действительности не все так просто как кажется.

На самом же деле в двигателе внутреннего сгорания стук может возникнуть по таким причинам:

1. Стучат коренные подшипники коленвала. Звук металлический, глухой. Проявляется на холостых оборотах и при резкой подаче газа.

2. Стучат шатунные подшипники. Резкий звук, проявляющийся также на холостых оборотах. Диагностируется эта неисправность путем поочередного выкручивания свеч зажигания при заведенном двигателе.

3.Стук в поршнях. Звук не звонкий и приглушенный. Помогает лишь замена колец и поршней.

4. Стук в клапанах. Звонкий шум средней частоты.

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Стук в клапанах может появиться по одной из следующих причин:

- вышла из строя пружина клапана – устанавливаем новую пружину;

- увеличились размеры имеющихся зазоров – возможно, стоит провести регулировку направляющей втулки или же ее заменить;

- износились кулачки на распределительном валу – в этом случае нужно лишь менять распредвал.

Подробнее разберемся в причинах появления стука в клапанах. Одной из самых распространенных причин является увеличенный зазор между кулачками распредвала и рычагами. Устранить эту проблему весьма просто – нужно лишь провести регулировку клапанов. Отмечу, что автомобилист должен регулировать клапана своего автомобиля через каждые пятнадцать тысяч километров пробега. Если об этом важном правиле забывать и приезжать на регулировку через 50-70 тысяч пробега, то ни один мастер вам уже не поможет.

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Часто водителей беспокоит стук клапанов на холодном двигателе. Другими словами, стук проявляется при запуске двигателе, а после прогрева мотора он пропадает. Специалисты объясняют этот эффект достаточно просто. По их словам, в автомобиле с большим пробегом все детали достаточно изношенные, особенно это касается деталей силовой установки. Из-за большого износа между деталями появляются критические зазоры, которые проявляют себя в виде стука при работе в холодном двигателе. При нагреве силового агрегата все внутренние детали расширяются, тем самым уменьшая зазоры и заставляя неприятный стук исчезнуть.

Тем не менее, это не говорит о том, что на посторонние звуки, появляющиеся в холодном двигателе можно не обращать внимания. На холостом ходу холодного двигателя также стучат шатунные и коренные подшипники коленчатого вала. Такая неисправность весьма серьезная, с ней нужно разбираться без промедлений.

На «горячую» также могут стучать клапана. Особенно их хорошо слышно при резком наборе оборотов. Часто причиной такого звука является некачественный бензин или, к примеру, отказ детонационного датчика.

Кроме вышеописанных причин, к стуку клапанов может привести плохо натянутый ремень ГРМ или же отсутствие масляной смазки из-за забитости смазочных каналов.

Определить на слух источник стука в двигателе обычному автомобилисту очень трудно. Но специалисты все же предлагают использовать в диагностике некоторые особенности работы мотора и народные методы:

- распределительный вал вращается в два раза медленнее коленвала и, соответственно, стук не будет частить;

- для лучшего прослушивания стука советуют использовать металлическую кружку (ставят на капот и прислоняются к ней ухом).

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