Re: Clutch Issue

Posted by HH56 On 2019/5/7 9:16:25

No clue on whether the plate will wear in adequately with time but on the snubber adjustment you want there to be a slight tension on the engine and trans but not so much that the engine mounts or cushions in the snubber are squashed. Service letter 13 #1 provides some guidance.

The purpose of the snubber is to control the fore/aft movement of the engine and trans. The rubber at the ball joints in the snubber needs to be in decent condition so it can provide a constant tension yet also have a bit of cushion for when torque wants to rotate the engine.

When the car starts to move in one direction the large mass of the engine and trans will want to stay still or effectively move in the opposite direction because of inertia. Depending on how tight or good of condition the motor mounts might be determines to a great extent how much movement there is but because the mounts are rubber and flexing there will be some. As the engine moves, because of the way the clutch linkage is connected between the frame and engine that movement would almost be like letting up on the pedal thus causing a decrease in friction and slowing the car. The engine would want to move back in the opposite direction again which in turn would apply the clutch more and cause the car to move again. This movement sets up a rapid jerking or chatter condition as the engine sort of vibrates back and forth for a period until the car movement is steady. The snubber is there to provide a bit of tension to keep the fore/aft movement to a minimum without making it feel like the engine is bolted solid. As the service letters mention, there are also other things that can contribute to the problem.