Originally Posted by fomenter
“Green” clutch break-in period
New, replacement, and reset clutches are “green” and require a break in period before shift event quality is maximized. During the break-in period, green clutches may exhibit:
• A rattle noise similar to a loose catalytic converter shield. This noise is commonly heard after light throttle 1-2, 2-3 or 3-4 upshifts. This rattle noise will diminish greatly as the clutch completes the break-in.
• A take-off shudder/launch judder (shaky vs. smooth).
• A harsh-shift feel during the first few cold shifts before the transmission reaches operating temperature.
All of the above conditions will diminish and the customer will notice progressively better launch and smoother shifting within the first few hundred miles of mixed driving as clutch break-in occurs. Note: The break-in process may take longer for highway driving, where the clutch is not shifting.
The transmission will automatically learn and make adaptations during shifting events, so it is important to evaluate after allowing sufficient driving time for adaptations to occur. This green clutch feel may reappear if the clutch touch points are reset and/or the clutch is removed and/or replaced. The condition may last longer for a clutch replacement than a reset. A reset may take up to 100 miles to get the new touch points learned to the point of not making
any of the out-of-adjustment noise. A clutch replacement may take up to 1000 miles to reach break-in dependent on the customer style of driving.
The break-in period can be minimized by performing the adaptive drive cycle exactly as described in the Workshop Manual, Section 307-11 (Fiesta) and 307-01 (Focus)
So the problems that a lot of us have ( 2012 Focus SE Transmission Grinding
) are accurately described here. All of our cars have over 1,000 miles, but the dealers still use this as ammo to claim that it's normal despite the fact that plenty of time was given for the clutches to break in. It should have read "If these "green" clutch problems persist after 1000 miles, the clutch internals should be inspected."