Clutch pedal vibration

[Bengy88]

(01-15-2023 )SudsyDiesel Wrote:  

(01-14-2023 )Petegraintrain Wrote:  Just replaced my clutch because I thought that would fix this issue. But it's still there. Basically my clutch pedal vibrates/pulsates when it's pulling. It's the most noticeable when i put my foot on the clutch pedal and remove some freeplay. So it must be coming from the engine. What would cause this? The higher my rpms get the worse it seems to get.

Howdy
First post on the forum so bear with me if its abit rough around the edges.
If its most definitely RPM related and not speed related I'd say you can safely rule out driveline issues, in fact anything post input shaft should be unrelated.

is there really a vibration or is it just something you can feel in your foot on the pedal? mirrors shaking, coffee spilling type vibration would really concern me as a tech whos seen broken cranks and also seen the invoices that go along with them

Did you happen to notice any paint marks on the floater plate between the clutch disks, typically they assemble a clutch, balance it then spray bomb it in one spot in a fashion that gets paint on both the outer clutch housing/pressure plate and the center plate so upon install it goes in the same way, even after us uneducated have it kicked apart on the floor 15 times.

Also verifying your clutch adjustment would be a great idea, when the fork is riding on the throw-out bearing you tend to get some feedback in the pedal, ignoring your pedal free-play ensure you have your 1/2" between your bearing and your clutch brake, and then adjust your linkage till you have 1/8" between your fork and bearing wear pads.

If all those things are good I'd start looking into flywheel and engine related problems. Did you have flywheel turned when you replaced clutch? Do you have a million mile harmonic balancer on it? stuff like that.
Best of luck
Josh

I agree mostly with what your saying but you do realize that the entire main shaft spins in a transmission even in neutral. So with that being post input shaft that would be misleading. But with the transmission and clutch being replaced since the problem occurred then I would safely rule both out.

If it’s got a hydraulic clutch it also always has pressure between the fork and bearing. Also if you have a hydraulic clutch or any clutch for that matter you shouldn’t be riding with your foot resting on the pedal. But hydraulic clutches tend to apply pressure slowly while your foot rest on the pedal.

I guess what we need to know is do you feel it while sitting still and rev the engine? Is resting your foot on the pedal the only way you feel anything? You also need to keep in mind that the clutch spins 2000+ rpm’s just like the engine does and the clutch pedal is a direct line to the clutch with no bushings, isolators…etc. so you are going to feel something when in hard pulls if your foot is resting on it (which it shouldn’t be). So what you are feeling could be normal and it also could be something to worry about.

If it happens sitting still revving it could be anything from a balancer, cracked fan, bad fan hub, injectors, your gear train, flywheel, etc. if it happens only in a pull it could be all of these things including a carrier issue, driveline issue, air bag ride height, and the list goes on. Just remember anything on your truck that spins especially at high speeds has to be balanced. If not it will beat shi#t slap apart. Good luck finding your issue brother.