clutch break in - BMW M5 Forum and M6 Forums
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post #1 of 19 Old 30th September 2008, 04:42 PM Thread Starter
sbacchus
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clutch break in

just curious, for those of you that have installed a new clutch and followed BMW's break in procedure (800-1000 shifts), how long did it take you? i installed my new clutch yesterday and counted 95 shifts, but i was in traffic much more than i usually am.
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post #2 of 19 Old 30th September 2008, 06:48 PM
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post #3 of 19 Old 30th September 2008, 07:04 PM
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It depends how much you drive. It took me almost 3 months to break in my new LUK clutch I put only 3K mi in a year

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post #4 of 19 Old 30th September 2008, 07:05 PM
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It depends how much you drive. It took me almost 3 months to break in my new LUK clutch I put only 3K mi in a year

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post #5 of 19 Old 30th September 2008, 07:59 PM
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I just had a new LUK clutch and flywheel put in, other than clutch drops and burnouts, there really doesnt seem to be much for a breakin.

Its smooth as butter and pulls so nice.

Charlie
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post #6 of 19 Old 30th September 2008, 08:42 PM
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Quote:
Originally Posted by desaille View Post
I just had a new LUK clutch and flywheel put in, other than clutch drops and burnouts, there really doesnt seem to be much for a breakin.

Its smooth as butter and pulls so nice.

same experience here.

Steve
00 M5
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post #7 of 19 Old 30th September 2008, 09:49 PM
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Quote:
Originally Posted by desaille View Post
I just had a new LUK clutch and flywheel put in, other than clutch drops and burnouts, there really doesnt seem to be much for a breakin.
Its smooth as butter and pulls so nice.
From page 106 of the Owner's Manual:

The clutch will also begin to function
optimally after about 300 miles
(500 km). Engage the gears carefully
during the break-in period.

"The greatest obstacle to discovery is not ignorance; it is the illusion of knowledge."

- Daniel Boorstin
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post #8 of 19 Old 30th September 2008, 09:53 PM
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Quote:
Originally Posted by jclyman View Post
From page 106 of the Owner's Manual:

The clutch will also begin to function
optimally after about 300 miles
(500 km). Engage the gears carefully
during the break-in period.
The shop did a couple of 7K rpm clutch drops so I'm good



Its like anything, let it work in before you start to working it

Charlie
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post #9 of 19 Old 1st October 2008, 12:31 AM Thread Starter
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factory workshop manuals say:

Quote:
Break in SAC clutches moderately to ensure correct operation.
Caution!
Fast sports driving maneuvers destroy new clutches!
Such maneuvers include:

• Driving maneuvers with high speed differentials
• Overlapping gearshifts with high speed differentials (slipping clutch)
• Very high starting speeds (e.g. when driving onto a transporter)

Comply with the following procedure when breaking in the new clutch:
- Break in friction linings with light to medium loads (observe breaking-in program)
- Normal driving with many "moderate" gearshifts
- Starting speeds on the level up to approx. 2000 rpm
- Specific breaking-in program on gentle gradients
- Starting speeds on a medium gradient up to approx. 2500 rpm (e.g. when driving onto a
transporter)

This procedure helps to create a carbon layer between lining and metal friction surface which
generates the required coefficient of friction.
Breaking-in
program:
• At approx. 30 km on roads
(specially for M5
and Z8)
• Shift through gears often Starting speed max.
2000 rpm
• Upshifts 1>2>3>4>5
• Downshifts at 2000 rpm 5>4>3>2>1
• Upshifts and downshifts at 3500-4000 rpm
• 3 to 5 times starting on gentle gradient (up
to approx.
12 %)
Starting speed max.
2500 rpm

Note:
Experience shows that approx. 800 to 1000 gearshifts are required for an optimally
broken-in lining when a car is driven "normally" (advise customer).
i'm at 145 changes today (can't believe i'm actually counting this stuff)

Last edited by sbacchus; 1st October 2008 at 01:00 AM.
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post #10 of 19 Old 1st October 2008, 12:34 AM
desaille
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Quote:
Originally Posted by sbacchus View Post
factory workshop manuals say:



i'm at 145 changes today (can't believe i'm actually counting this stuff)
I lost count at 1

Charlie
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