Transmission/clutch clunk.

[Cleft_Asunder]

If I am in first gear with the clutch disengaged, and I quickly engage the clutch, it will make a clunk sound which I can also feel. If I do the exact same thing but slowly engage the clutch, it will be seemless. Is there some sort of slack between the engine and driveshaft which causes this? Because there's definitely slack in mine.

[dehall88]

Is there any noise if you suddenly let of the gas, then get back on it with the car in gear?

[cmgreen50]

its an engine or tranny mount

[transzex]

I agree

[cmgreen50]

bone agrees with me im honored lol

[transzex]

quit hugging your nut sack

[cmgreen50]

im scouring threads no time for self love

[Cleft_Asunder]

I replaced all my mounts 6 months ago with honda OEM. I did fill the rear mount with windo weld (which I've thought about removing). So other than the WW, I can't visualize what could be wrong with my mounts or... mount brackets.

[Cleft_Asunder]

Originally Posted by dehall88

Is there any noise if you suddenly let of the gas, then get back on it with the car in gear?

Yes. Say for example I'm on the freeway in 5th. If I rapidly press the pedal I will feel a thump. If I rapidly let go, I believe there is a thump there to. See it's like the engine has 2 positions through which it oscilated --front and back, resting and accelerating. But if I'm not mistaken, this is how it's supposed to be. Another interesting thing is that in between 1st and 2nd, when I disengage the clutch real fast sometimes I get the thump again. I ran into a guy with a prelude who had the same problem.

I did research before I made this thread and I ran into Land Rovers, Lexus is300's, and Subaru's with the same problem of the clutch thunking rather than engaging seemlessly. It was particularly common on sports bikes.

Yes, it may have something to do with the mounts, but what?

[cmgreen50]

if the REAR mount is filled with whatever the hell window weld is then the positions it would alternate between would be? the ones you think it is which is forward and backward weld your rear mount solid or replace it with a real mount no more window weld

[Cleft_Asunder]

Nah it's normal. The reason I feel a clunk when I press down on the clutch pedal and rapidly engage it again is because the mainshaft is no longer spinning, and when the clutch is rapidly engaged, well it clunks a little because the mainshaft has to go to 700+ RPM from 0 RPM. If I go from neutral > clutch disengaged > quick shift into 1st and clutch engaged > accelerate, the mainshaft doesn't have time to spin down, creating a seemless clutch transition. It should be noted that there is a gap when the mainshaft is spun clockwise and counterclockwise by hand.

This is what I'm feeling, as one guy described it: (Note, this is coming from an 06 Subaru WRX)

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Its probably coming from the transaxle. Is the car in nuetral? When your in nuetral with your foot off the clutch (engaged) the transaxle is being spun by the engine.

When you press the the clutch pedal in (dis-engage) the transaxle is no longer being driven by the engine. So when you dis-engage the clutch for a second then engage it quickly, the transaxle main shaft is accelerated up to engine idle speed as fast as you can drop the clutch. This make a little "clunking" noise.

Mine does the same thing. If you let the clutch out a little slower, the noise should vanish.

[Cleft_Asunder]

Another interesting thing to note is regarding shifting in between gears. For an easy smooth seemless shift, the gas pedal should be pushed in (acceleratation) rather than held still right before the shift. This adds spinning inertia to the mainshaft, therefore when the clutch is disengaged, the mainshaft is still spinning up, therefore when the clutch is engaged for the next gear, it mates with a mainshaft that is still at high RPM.

[NOSAJ]

you should window weld the rest of tha mounts

[Cleft_Asunder]

Originally Posted by NOSAJ

you should window weld the rest of tha mounts

Nah, it would cause too much vibration. Rear mount results in very little, but I wouldn't want any more. And those guys who run solid mounts, they are insane.

[cmgreen50]

i love my solid motor mounts rubbers for vaginas

[dehall88]

mm not to scare you but that sounds an awful like the first signs my trans gave me that the diff pin was going to break. Jack both front wheels off the ground sometime with the car in gear. try to move them both in the same direction. rock them back and forth, see how much play there is. I had my car up on my rack one day and noticed I had about 30 to 45 degrees of play. couple weeks, maybe a month or so later. boom no go no more

[Cleft_Asunder]

Originally Posted by dehall88

mm not to scare you but that sounds an awful like the first signs my trans gave me that the diff pin was going to break. Jack both front wheels off the ground sometime with the car in gear. try to move them both in the same direction. rock them back and forth, see how much play there is. I had my car up on my rack one day and noticed I had about 30 to 45 degrees of play. couple weeks, maybe a month or so later. boom no go no more

Hmmm. Well it's definitely not the mounts because when reving in neutral the engine barely has any movement. It's only when the differential is introduced that I have it. And the car is very touchy to drive, especially in between shifts. It's a real pain in the ass shifting from 1st to 2nd without jerking the vehicle. And I know how to drive stick. I listen to other Honda's on the road, and it's effortless when they shift gears. They don't get any backlash, they just sink in the clutch without even thinking about it..

So again, this all relates to the primary symptom: When coasting, if the gas pedal is pressed quickly or released quickly, the engine/trany backlash due to slack. There's no way it could be the mounts because then it would do it in neutral while reving (I guess). So I'm thinking differential...

[Cleft_Asunder]

Hmmm, I wonder if it's loose suspension. Possible?

[Cleft_Asunder]

I would bet my money that it's the shocks. I took it for a spin and it feels like when accelerating, the front wheels jerk forward, and then when the peddle is depressed, they jerk back. The shocks have 123k on them, originals.

[lilmidget08]

im gonna agree with the guy who said its the diff on its way out. it happened to me 2 months ago. do what he said put it up on a lift and try to spin them both in the same direction and see how much play you have. o and just to let you know i have 135,000 on my stock struts and not a noise outta them.