ВАЗ-2109: почему стучат пальцы в двигателе?

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Бывает так, что из-под капота раздаются неприятные и даже настораживающие звуки, а автовладелец, в принципе, понимая причину, не знает, почему стучат пальцы в двигателе. В основном, шум из движка является следствием неисправных клапанов. Стучать они могут после длительной эксплуатации и если за ними долго не ухаживать.

Специалисты считают, что стук клапанов чаще всего происходит из-за слишком большого зазора между кулаками распределительного вала и рычагами устройства. Такой зазор провоцирует задевание кулачков за рокер, что и создает сильный шум. Происходит интенсивное истирание кулачков из-за их постоянного ударения об рокер, и вскоре и сам движок может придти в негодность. Поэтому важно всегда контролировать размер данного зазора. Необходимые параметры данного значения указаны в заводской инструкции к машине.

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Кстати, зазор может быть не только больше, но и меньше положенного значения. В итоге клапаны слишком сильно зажимаются, а иногда могут и совсем прекратить закрываться. Поездка с такими клапанами быстро провоцирует перегрев системы, что чревато пониженной компрессией, выходом из строя цилиндра. Конечный итог всего этого – погибший от перегрева и неправильной работы двигатель. Чтобы всего этого избежать, достаточно как минимум раз в два месяца (это где-то 10 тыс. км пробега) проверять состояние клапанов и при необходимости производить их регулировку.

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Иногда может быть так, что стук клапанов слышен  при активации еще холодного движка. А после прогрева стук пропадает. В этом случае стоит винить поршень, в котором появился дефект. Либо же увеличился зазор между цилиндром и поршнем.

Итак…почему же могут стучать пальцы в двигателе? Тут уже причиной может быть детонация в движке. Особенно часто это случается при сильной нагрузке силового агрегата. Есть вероятность того, что на фоне этой проблемы «погиб» также датчик детонации. Самый эффективный метод предотвращения подобной неприятности – использовать горючее хорошего качества и постоянно следить за уровнем масла в системе. Также такое случается при сломанных гидрокомпенсаторах.

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Причина появления стука на холостых оборотах – вышедшие из строя пальцы для поршневой группы и дефект в шатунной втулке. Стук в этом случае чаще всего наблюдается при торможении движком. А при возрастающей нагрузке звук исчезает.

Стук также может возникать из-за загрязненных клапанов. Ведь со временем на них образуется нагар, и он мешает им занимать нужное положение при работе. Поэтому ответственный водитель никогда не ленится производить очистку клапанов. Просто время от времени надо проверять их состояние. Если опыта для этого не хватает, то можно обратиться в сервисный центр, где за небольшую плату можно получить комплексную чистку внутренних устройств автомобиля.

В некоторых случаях стук может появляться после ремонта движка. Это значит, что во время починки была задета какая-то важная деталь. Самыми чувствительными в этом плане являются гидрокомпрессоры. Если их замена не поменяла положение в лучшую сторону, то нужно грешить на масло. Смотрим на его состояние. Если оно имеет темный оттенок, то есть вероятность, что гидроопоры уже не функционируют должным образом из-за такой смазки. Меняем масло и снова проверяем, исчез ли стук в двигателе.

Головка блока цилиндров – еще одна причина шума в силовом агрегате. Менять ее следует сразу вместе с клапанами и колпачками. Специалисты рекомендуют проводить эту процедуру в автосервисе, так как новичок вряд ли осилит подобный вид ремонтных работ. Перед тем, как оставлять машину на ремонт, стоит описать мастеру характер и тональность стука, а также рассказать, в каких случаях и при каких дорожных условиях он чаще всего возникает. Это позволит ему быстрее диагностировать проблему и решить ее.

 

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