Clutch issues...

[seanmcr6]

2004 996 C4S 6 speed

So I am experiencing 2 issues with my transmission....

1. at precisely 3200 RPM...under part throttle..a slight mis/slip/hickup...at full throttle, it's not there.

2. I'm having difficulty to shift down. Slowly to a red light, for example, clutch fully depressed...it does not want to go into second (from third) and it will NOT go into first unless I am completely and utterly stopped. I can be doing 3 kph...and it won't engage. If I let the clutch out while in neutral and then re-engage...this sometimes helps, but not always. So it almost feels like the clutch is not fully dis-engaging when I have the pedal all the way to the floor. It also seems to get worst as the car heats up. Thinking the clutch actuation point might be set too close to the floor(?)

Any feedback would be appreciated.

Cheers,

sean

[dammad]

The first issue is likely the common lag/glitch in the VarioCam system. What is happening is the cam positions are in change over at that point and result in a slight loss of power at that point. This is normal for 996s and is likely not related at all to your transmission.

Second issue sounds like your clutch is binding. (I have a Tip so don't know the 996 clutch well.). How easily does the car roll when the clutch is depressed (for example if you were to have a friend push it). Have you checked the clutch hydraulic fluid level?

[seanmcr6]

The first issue is likely the common lag/glitch in the VarioCam system. What is happening is the cam positions are in change over at that point and result in a slight loss of power at that point. This is normal for 996s and is likely not related at all to your transmission.

Second issue sounds like your clutch is binding. (I have a Tip so don't know the 996 clutch well.). How easily does the car roll when the clutch is depressed (for example if you were to have a friend push it). Have you checked the clutch hydraulic fluid level?

ok, that sounds good about the variocam....

It seems to roll down hills pretty good with the clutch in....haven't tried to have anyone push it. The clutch does seem to grab very close to the floor....100% engaged within 2 inches of movement from fully depressed.

No, I haven't checked the fluid yet, I don't have a garage....or even a paved driveway...so getting it up on jack stands means driving it to a friend's house :| (I know, I know)

Thanks for the feedback!

sean

[fpb111]

Quick way to see if the clutch is dragging is to start car in neutral.

Let the clutch pedal up to start the trans spinning, then depress the clutch wait 2-3 seconds and slowly ease the trans into reverse. If it grinds the clutch is probably dragging. If it is dragging you can actually feel the gear teeth ratcheting past each other if you engage slowly.

Use reverse because it has no syncro.

Edited October 1, 2010 by fpb111

[whall]

Sean,

I'm not sure this has any relevance to your situation or not; but, the other day I was talking to a technician at my dealership and he showed me a Carrera that was in for clutch service. The bell housing had been a storage point for a squirrel or other small rodent. The nuts, acorns, ?, had been ground into a dry, coarse powder that "gummed up" the fingers on the pressure plate. The clutch was rendered unable to completely engage or disengage. The car owner had to have the car trailered to the dealer.

The technician showed me two vent holes through which the animal could enter the bell housing. Incidentally, The car was an MY07 with 2,000 miles on the odometer....probably stored where small animals abound.

Bill

[seanmcr6]

Sean,

I'm not sure this has any relevance to your situation or not; but, the other day I was talking to a technician at my dealership and he showed me a Carrera that was in for clutch service. The bell housing had been a storage point for a squirrel or other small rodent. The nuts, acorns, ?, had been ground into a dry, coarse powder that "gummed up" the fingers on the pressure plate. The clutch was rendered unable to completely engage or disengage. The car owner had to have the car trailered to the dealer.

The technician showed me two vent holes through which the animal could enter the bell housing. Incidentally, The car was an MY07 with 2,000 miles on the odometer....probably stored where small animals abound.

Bill

Best story ever! LOL

There is only one vent hole on my bell housing that has a small, downward facing, tube attached. At least that's all I can see/find on mine. Only looked at the tranny once....while on my back. However, if there were any small rodents around my place, there are a few very large Rottweilers that would have eaten them by now ;)

[seanmcr6]

Quick way to see if the clutch is dragging is to start car in neutral.

Let the clutch pedal up to start the trans spinning, then depress the clutch wait 2-3 seconds and slowly ease the trans into reverse. If it grinds the clutch is probably dragging. If it is dragging you can actually feel the gear teeth ratcheting past each other if you engage slowly.

Use reverse because it has no syncro.

hmmm, I'll try this at lunch today...thanks

sean

[seanmcr6]

Quick way to see if the clutch is dragging is to start car in neutral.

Let the clutch pedal up to start the trans spinning, then depress the clutch wait 2-3 seconds and slowly ease the trans into reverse. If it grinds the clutch is probably dragging. If it is dragging you can actually feel the gear teeth ratcheting past each other if you engage slowly.

Use reverse because it has no syncro.

hmmm, I'll try this at lunch today...thanks

sean

ok, tried this at lunch....3 times....doesn't seem to be binding as far as I can tell. So I guess that's good news, but the search continues...

sean