排气管冒蓝烟--这是什么意思?

 排气管冒蓝烟--这是什么意思?

Dan Hart

废气中的蓝烟

当你看到排气管冒蓝烟时,说明发动机在烧机油。 问题可能是活塞环磨损、气门导管磨损或气门杆密封圈磨损/破裂。

在老式车辆中(催化器之前的时代),你可以在发动机运行的整个过程中看到排气中的蓝烟。 然而,如果车辆配备了催化器,你可能只在启动时看到蓝烟。 一旦催化器升温到工作温度,它就像一个焚烧炉,烧掉并清理排气。 所以你往往看不到蓝烟。升温后冒烟。

如何诊断是气门环、气门导管还是气门杆密封圈的问题?

- 湿/干压缩试验可以确定 无论烧油问题是与气环还是气门有关--对所有汽缸进行干式压缩试验,并记下读数。 使用泵式油罐,向一个汽缸注入约3泵机油,再进行一次压缩试验。 在其余汽缸上分别重复注油/压缩试验。

如果用油后压缩量增加,问题是活塞环磨损。 如果压缩量不增加,问题是气门导管或气门杆密封。

- 泄漏测试确定哪个(些)气缸 在一个汽缸中安装一个泄漏测试仪,并与压缩空气源连接。

将一只丁腈橡胶或乳胶手套套在排气管上。 如果排气阀漏气,压缩空气会充满排气系统并使手套充气。 如果进气阀漏气,你会听到压缩空气漏进进气歧管的声音。

- 测试气门杆密封圈是否泄漏。 如果气门导管磨损,即使是好的气门杆密封圈也会泄漏。 但由于硬化和开裂,气门杆泄漏在旧车辆上最普遍。

你需要一个开着跟车的帮手来进行这个测试。 气门杆密封圈磨损后,通常在早晨第一时间启动时,排气管会产生蓝烟。 这是因为密封圈磨损后,机油会通过密封圈,顺着气门导管滴落,直到机油积聚在活塞顶部。 这就是为什么启动时有一团蓝烟。

然而,你可以通过这个测试确认更多。 利用当你的脚离开油门踏板时,发动机会产生更多的真空这一事实,使用这个测试方法。 早上第一件事就是启动车辆。 不要让它热起来。

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开车去兜风,让你的助手跟在你后面。 加速,然后松开油门,重复多次。 每次你松开油门,你的助手应该注意到排气管里有一股蓝烟。 这证实了气门杆密封圈已经失效。 你可以尝试安装新的气门杆密封圈,但如果气门导管也磨损了,新密封圈会如果失败,你就会再次出现蓝烟。

修复因活塞环磨损而导致的烧机油问题

- 新的或二手发动机

- 重建目前的发动机

- 较重的机油不会减少因活塞环磨损而引起的机油燃烧,实际上会加速发动机的磨损。

修复因气门导管磨损而导致的烧油问题

- 拆下汽缸盖,让机械厂安装新的导杆或将目前的导杆打结。 安装新的气门杆密封件

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- 使用较重的机油可能会减缓机油的燃烧速度,但也会造成发动机的额外磨损。

修复因阀杆密封圈磨损而导致的烧油问题

- 更换阀杆密封件。

警告:继续在排气管冒蓝烟的情况下行驶,将导致催化器早期故障;更换这种部件的费用很高。

©. 2022

Dan Hart

Dan Hart is an automotive enthusiast and expert in car repair and maintenance. With over 10 years of industry experience, Dan has honed his skills through countless hours of working on various makes and models. His passion for cars started at a young age, and he has since turned it into a successful career.Dan's blog, Tips for Car Repair, is a culmination of his expertise and dedication to helping car owners tackle common and complex repair issues. He believes that everyone should have some basic knowledge of car repair, as it not only saves money but also empowers individuals to take control of their vehicle's maintenance.Through his blog, Dan shares practical and easy-to-follow tips, step-by-step guides, and troubleshooting techniques that break down complex concepts into understandable language. His writing style is approachable, making it suitable for both novice car owners and experienced mechanics seeking additional insights. Dan's goal is to equip his readers with the knowledge and confidence needed to tackle car repair tasks on their own, thus preventing unnecessary trips to the mechanic and expensive repair bills.In addition to maintaining his blog, Dan also runs a successful auto repair shop where he continues to serve his community by providing high-quality repair services. His dedication to customer satisfaction and his unwavering commitment to deliveringexceptional workmanship has earned him a loyal customer base over the years.When he's not under the hood of a car or writing blog posts, you can find Dan enjoying outdoor activities, attending car shows, or spending time with his family. As a true car enthusiast, he is always up-to-date with the latest industry trends and eagerly shares his insights and recommendations with his blog readers.With his vast knowledge and genuine passion for cars, Dan Hart is a trusted authority in the field of car repair and maintenance. His blog is an invaluable resource for anyone looking to keep their vehicle running smoothly and avoid unnecessary headaches.