renewal of the clutch cylinders

deQuincey · Jan 20, 2012

problem: leaks from the master cylinder inwards the pedals area

my car was made in 1971, so this is the old system:
.

removed, out from the car:

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got the replacements in bmw

deQuincey · Jan 20, 2012

i found that the actuators were different
.

the new one is too short

.

so i swaped the old and the new, maintaining the dimmension from the plate to the pedal attachement: 140mm
.

.

done

deQuincey · Jan 20, 2012

slave cylinder

take care of the anti-rotating plate, it is no more available, so re-use it

.

.

deQuincey · Jan 20, 2012

renewal of the existing parts

by the way, there is no really need of buying new parts, you can renew the old ones using appropriate kits from walloth&nesch:

master cylinder:

.

here right-top you can see the w&n kit

correct posi

tion

.

deQuincey · Jan 20, 2012

slave cyl

w&n kit right-top of the pic

this one is difficult to introduce in the cylinder, so this tip will help

.

the renewed old set, prepared for a friend:

deQuincey · Jan 20, 2012

assembly in the car

master cylinder:

deQuincey · Jan 20, 2012

slave cyl

Stevehose · Jan 20, 2012

Very nice - do you have the clutch slave rebuild kit part number from W&N?

deQuincey · Jan 20, 2012

Stevehose said:
Very nice - do you have the clutch slave rebuild kit part number from W&N?

of course: (the last figure is the price in EUR)

the rebuild kit parts are:

A 21 52 1 102 625 repair kit master cylinder 19,50

A 21 52 1 113 880 Repair kit for slave cylinder

15,00

Stefan · Jan 21, 2012

Most famous E9 thumb?

Great to see your thumb again in a well documented "how to to it" picture serie

I've done the master cylinder as described a few years back. Next to come is the slave cylinder. A lot of thank you for the source of rebuild kit to the slave.

Keep up your by all of us appreciated photo documentation.

Cheers!

CRJ Driver · Jan 21, 2012

Awesome...Nice work.

Stevehose · Jan 21, 2012

On Penske and Maximillian the 880 part number repair kit is listed for the other style "inside" slave cylinder - this kit also fits the old style "outside" cylinder too? I have same setup as you.

deQuincey said:
of course: (the last figure is the price in EUR)

the rebuild kit parts are:

A 21 52 1 102 625 repair kit master cylinder 19,50

A 21 52 1 113 880 Repair kit for slave cylinder
15,00

deQuincey · Jan 21, 2012

Stevehose said:
On Penske and Maximillian the 880 part number repair kit is listed for the other style "inside" slave cylinder - this kit also fits the old style "outside" cylinder too? I have same setup as you.

well, yes, i have used this 880 kit in the old style slave cylinder, and the result was good, the only drawback, is that i do not know how to install the flexible cover that comes with the kit (the one that should go in the push rod), fortunately my old flexible cover was quite usable, so i didn´t replace it

regards

deQuincey · Jan 21, 2012

Stefan said:
Great to see your thumb again in a well documented "how to to it" picture serie

ha, ha, ...the thumb always gives you the scale of the working place (easier than the odd mm to inches conversion), and also somehow a social-humanistic approach of this kind of mechanical work, it tells you the story of the hard, and dirty job that is needed to reach the target of a well maintained coupe
thanks for your comment

by the way, it is really hard to clean my nails after this kind of work, so i ended up telling the story to the people when I attend those endless boring serious dressing code meetings, then I become the king of the coffe-breaks ;-)

matphill · Jan 21, 2012

Great write-up and photos! Some comments to assist others giving it a go. The condition of the bores in both the master and slave cylinder should be inspected closely. Typically very minor pitting can be removed with a hone attached to a power drill. Anything deep enough to catch with your finger nail will require a specialist to re-sleeve. This is common and shouldn't cost too much. Stainless steel sleeves will resist further pitting from the moisture in old fluid.

There is also a two piece nylon bush that goes in the pedal pivot bolt hole. Costs only a few cents and should be replaced as a matter of course.

Repair kits are available from ATE directly or BMW dealers. Prices vary so W&N can be a good bet.

deQuincey · Jan 22, 2012

matphill said:
There is also a two piece nylon bush that goes in the pedal pivot bolt hole. Costs only a few cents and should be replaced as a matter of course.
bet.

+1, thanks for remembering this,

yeah, the nylon bushes are unexpensive, available at your favourite bmw dealer, and really necessary to complete a good renewal of this key system

together with a new self locking nut, and the correct torque setting, 25 to 30 N.m

do not forget to pour a little long term grease in the points specified in the blue manuals too

regards

deQuincey · Feb 1, 2012

adding some info on the rigid hose that goes from the brake fluid reservoir to the master cyl

difficult to assembly, lubricate a bit with brake fluid to insert the hose into the master cyl

renewal of the clutch cylinders

deQuincey

Quousque tandem...?

deQuincey

Quousque tandem...?

deQuincey

Quousque tandem...?

deQuincey

Quousque tandem...?

deQuincey

Quousque tandem...?

deQuincey

Quousque tandem...?

deQuincey

Quousque tandem...?

Stevehose

Well-Known Member

deQuincey

Quousque tandem...?

Stefan

Well-Known Member

CRJ Driver

Active Member

Stevehose

Well-Known Member

deQuincey

Quousque tandem...?

deQuincey

Quousque tandem...?

matphill

Member

deQuincey

Quousque tandem...?

deQuincey

Quousque tandem...?