What Causes Shaking When Starting After Replacing the Clutch Plate?
3 Answers
Car shaking during startup is mostly related to the clutch. The specific reasons include: 1. Weak spring tension: When a car has been used for too long, the tension of the clutch pressure spring weakens, or cracks appear in the diaphragm spring, both of which can cause shaking when the clutch engages. The solution in this case is to replace the spring. 2. Engine idling: Engage a low gear, slowly release the clutch pedal and increase the throttle to start. If the car body shakes at this point, it indicates clutch shaking. 3. Uneven tension of the clutch pressure spring: Inconsistent adjustment of the release levers and/or uneven ends of the diaphragm spring fingers can lead to unsynchronized pressure application times, causing uneven force on the pressure plate and resulting in clutch shaking.
I just replaced the clutch disc and noticed severe shaking during takeoff, a situation I've encountered several times. Typically, the issue lies in the installation process, such as the new clutch disc not being aligned properly, leading to uneven engagement; or the flywheel surface having scratches or wear, becoming uneven, and not being addressed, causing uneven friction when the clutch is pressed down, resulting in shaking. Additionally, installing a new disc but having insufficient pressure from the pressure plate or loose screws can also cause this. Sometimes, poor-quality aftermarket parts that are too cheap and have uneven materials can cause problems right after installation. I recommend checking the condition of the flywheel—if its surface is uneven, it should be resurfaced. Also, ensure all installation bolts are torqued to the specified values. Don't forget to inspect the transmission mounts for looseness, as worn or poorly secured rubber mounts can worsen shaking during takeoff. It's not a major issue but should be fixed promptly to avoid long-term damage to the transmission and increased fuel consumption.
Buddy, after I DIY replaced the clutch disc, the car shook badly during takeoff - it was really annoying. Most issues come from improper installation. DIYers often make small mistakes like misaligning the new disc, not fully tightening bolts, or installing without properly cleaning indented flywheel surfaces. If the diaphragm spring on the pressure plate loses elasticity, it can also cause unstable starts. Sometimes it's a parts quality issue - buying cheap knockoffs with uneven friction materials that shake immediately. I once replaced the pressure plate springs too, and the situation improved significantly. Remember to check for oil leaks in the clutch assembly or air in the slave cylinder - often overlooked details that make a big difference. Takeoff is fundamental driving - if it shakes badly, don't tough it out. Get a trusted mechanic to recheck the installation for peace of mind.
