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Well Simon, that explanation, although a bit weird, is possibly correct.
With a master cylinder, when the piston reaches the top of its stroke, a
"valve" opens to connect the fluid in the bore of the cylinder to the
reservoir.
This ensures that the system is filled with fluid before the pedal is
pressed to operate the clutch or brake and that any expansion of the fluid
in the system can be relieved with the fluid being returned to the
reservoir.
If an incorrect push rod is used which is too long the pedal can reach the
top of its travel (limited by a some mechanical stop other than the circlip
in the master cylinder) such that the piston of the master cylinder does
not reach the top end of its stroke thus preventing the "valve" from
opening.
This scenario results in the fluid in the system remaining under pressure
and, probably in your case, holding the clutch in a partially released
condition.
As the fluid warms up it expands and, having nowhere else to go, this
effectively depresses the clutch release bearing further which eventually
causes the clutch to slip.
This scenario is actually more common in braking systems.
In the case of the master cylinder of the 100 for example the length of the
brake master cylinder is adjustable and incorrect adjustment can result in
the brakes eventually locking up completely.
The same applies in the BJ8 where the master cylinder push rod is also
"adjustable".
A more common and very similar situation with BJ8's is caused when the
brake servo does not return fully to its "rest" position resulting in the
"valve" within the servo not opening.
M
On Sun, Jun 23, 2024 at 8:57=E2=80=AFAM Simon Lachlan via Healeys <
healeys@autox.team.net> wrote:
> With reference to the slipping clutch &/or overdrive, I do believe that i=
t is
> fixed. Said that before and it let me down again. But, this time, I had i=
t
> done professionally by a local team that I=E2=80=99d never used before.
>
> Anyhow, after my wasting a lot of time and some money checking everything
> and getting nowhere, these guys said that the rod in the clutch master
> cylinder was too long and they=E2=80=99d had to reduce it=E2=80=99s lengt=
h. (Non-standard
> rod. Long story). So, apparently the pressure wasn=E2=80=99t being allowe=
d to
> bleed back/out and the slave cylinder remained pressurized etcetc.
>
> Now, if that sounds like a muddle, it is and that=E2=80=99s because I=E2=
=80=99ve never
> delved into or fully understood the workings of the clutch master cylinde=
r.
> (Which is why I never thought of it during the whole affair. But nor did
> anyone else). I know it=E2=80=99s not just a simple pusher, like a bicycl=
e pump,
> but that=E2=80=99s really all. I googled it and looked into my years=E2=
=80=99 worth of
> collected files of advice and wisdom. But nothing found.
>
> Can someone just explain how the thing works so I can understand what was
> going on? I should like to close the whole chapter and move on=E2=80=A6=
=E2=80=A6=E2=80=A6..
>
> Thanks,
>
> Simon
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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:arial,sa=
ns-serif;font-size:small">Well Simon, that explanation, although a bit weir=
d, is possibly correct.</div><div class=3D"gmail_default" style=3D"font-fam=
ily:arial,sans-serif;font-size:small">With a master cylinder, when the pist=
on reaches the top of its stroke, a "valve" opens to connect the =
fluid in the bore of the cylinder to the reservoir. <br></div><div class=3D=
"gmail_default" style=3D"font-family:arial,sans-serif;font-size:small">This=
ensures that the system is filled with fluid before the pedal is pressed t=
o operate the clutch or brake and that any expansion of the fluid in the sy=
stem can be relieved with the fluid being returned to the reservoir. <br></=
div><div class=3D"gmail_default" style=3D"font-family:arial,sans-serif;font=
-size:small">If an incorrect push rod is used which is too long the pedal c=
an reach the top of its travel (limited by a some mechanical stop other tha=
n the circlip in the master cylinder) such that the piston of the master cy=
linder does not reach the top end of its stroke thus preventing the "v=
alve" from opening.</div><div class=3D"gmail_default" style=3D"font-fa=
mily:arial,sans-serif;font-size:small">This scenario results in the fluid i=
n the system remaining under pressure and, probably in your case, holding t=
he clutch in a partially released condition. <br></div><div class=3D"gmail_=
default" style=3D"font-family:arial,sans-serif;font-size:small">As the flui=
d warms up it expands and, having nowhere else to go, this effectively depr=
esses the clutch release bearing further which eventually causes the clutch=
to slip.=C2=A0</div><div class=3D"gmail_default" style=3D"font-family:aria=
l,sans-serif;font-size:small">This scenario is actually more common in brak=
ing systems.=C2=A0</div><div class=3D"gmail_default" style=3D"font-family:a=
rial,sans-serif;font-size:small">In the case of the master cylinder of the =
100 for example the length of the brake master cylinder is adjustable and i=
ncorrect adjustment can result in the brakes eventually locking up complete=
ly.</div><div class=3D"gmail_default" style=3D"font-family:arial,sans-serif=
;font-size:small">The same applies in the BJ8 where the master cylinder pus=
h rod is also "adjustable".</div><div class=3D"gmail_default" sty=
le=3D"font-family:arial,sans-serif;font-size:small">A more common and very =
similar situation with BJ8's is caused when the brake servo does not re=
turn fully to its "rest" position resulting in the "valve&qu=
ot; within the servo not opening.</div><div class=3D"gmail_default" style=
=3D"font-family:arial,sans-serif;font-size:small"><br></div><div class=3D"g=
mail_default" style=3D"font-family:arial,sans-serif;font-size:small">M<br><=
/div><div class=3D"gmail_default" style=3D"font-family:arial,sans-serif;fon=
t-size:small"><br></div><div class=3D"gmail_default" style=3D"font-family:a=
rial,sans-serif;font-size:small"><br></div></div><br><div class=3D"gmail_qu=
ote"><div dir=3D"ltr" class=3D"gmail_attr">On Sun, Jun 23, 2024 at 8:57=E2=
=80=AFAM Simon Lachlan via Healeys <<a href=3D"mailto:healeys@autox.team=
.net" target=3D"_blank">healeys@autox.team.net</a>> wrote:<br></div><blo=
ckquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left=
:1px solid rgb(204,204,204);padding-left:1ex"><u></u>
<div>
<p dir=3D"LTR"><span lang=3D"en-gb"><font face=3D"Times New Roman">With ref=
erence to the slipping clutch &/or over</font></span><span lang=3D"en-g=
b"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lan=
g=3D"en-gb"></span><span lang=3D"en-gb"><font face=3D"Times New Roman">driv=
e, I do believe that</font></span><span lang=3D"en-gb"></span><span lang=3D=
"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><spa=
n lang=3D"en-gb"> <font face=3D"Times New Roman">it</font></span><span lang=
=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><=
span lang=3D"en-gb"></span><span lang=3D"en-gb"> <font face=3D"Times New Ro=
man">is fixed. Said that before and it let me down again. But, this time, I=
had it done professionally by a local team that I=E2=80=99d ne</font></spa=
n><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-=
gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"><font face=3D"T=
imes New Roman">ver used before. </font></span></p>
<p dir=3D"LTR"><span lang=3D"en-gb"><font face=3D"Times New Roman">Anyhow, =
after my wasting a lot of time and some money checking everything and getti=
ng nowhere, these guys said that</font></span><span lang=3D"en-gb"></span><=
span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"=
></span><span lang=3D"en-gb"> <font face=3D"Times New Roman">the rod in the=
clutch master cylinder was too long and they=E2=80=99d had to reduce it=E2=
=80=99s length. (Non-standard rod. Long story). So,</font></span><span lang=
=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><=
span lang=3D"en-gb"></span><span lang=3D"en-gb"><font face=3D"Times New Rom=
an"> apparently the pressure wasn=E2=80=99t being allow</font></span><span =
lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></sp=
an><span lang=3D"en-gb"></span><span lang=3D"en-gb"><font face=3D"Times New=
Roman">ed</font></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></=
span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"=
en-gb"><font face=3D"Times New Roman"> to bleed back/out and the slave cyli=
nder remained pressurized etcetc.</font></span></p>
<p dir=3D"LTR"><span lang=3D"en-gb"><font face=3D"Times New Roman">Now, if =
that sounds like a</font></span><span lang=3D"en-gb"></span><span lang=3D"e=
n-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span =
lang=3D"en-gb"> <font face=3D"Times New Roman">muddle, it is and that=E2=80=
=99s because I=E2=80=99ve never delved into or fully understood the working=
s of the clutch master cylinder.</font></span><span lang=3D"en-gb"></span><=
span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"=
></span><span lang=3D"en-gb"><font face=3D"Times New Roman"> (Which is wh</=
font></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span l=
ang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"><font=
face=3D"Times New Roman">y I never thought of it during the whole affair. =
But nor did anyone else).</font></span><span lang=3D"en-gb"></span><span la=
ng=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span=
><span lang=3D"en-gb"><font face=3D"Times New Roman"> I know it=E2=80=99s n=
ot just a s</font></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"><=
/span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D=
"en-gb"><font face=3D"Times New Roman">imple pusher, like a bicycle pump, b=
ut that=E2=80=99s really all. I googled it and looked into my years</font><=
/span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D=
"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"><font face=
=3D"Times New Roman">=E2=80=99</font></span><span lang=3D"en-gb"></span><sp=
an lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"><=
/span><span lang=3D"en-gb"><font face=3D"Times New Roman"> worth of</font><=
/span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D=
"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"><font face=
=3D"Times New Roman"> collected files of advice and wisdom. But nothing fou=
nd.</font></span></p>
<p dir=3D"LTR"><span lang=3D"en-gb"><font face=3D"Times New Roman">Can some=
one just explain how the thing works so I can understand what was going on?=
</font></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span=
lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"><fo=
nt face=3D"Times New Roman"></font></span><span lang=3D"en-gb"></span><span=
lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></s=
pan><span lang=3D"en-gb"> <font face=3D"Times New Roman">I should like to c=
lose the whole chapter and move on=E2=80=A6=E2=80=A6=E2=80=A6..</font></spa=
n><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-=
gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span></p>
<p dir=3D"LTR"><span lang=3D"en-gb"><font face=3D"Times New Roman">Tha</fon=
t></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=
=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"><font fa=
ce=3D"Times New Roman">nks,</font></span></p>
<p dir=3D"LTR"><span lang=3D"en-gb"><font face=3D"Times New Roman">Simon</f=
ont></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span la=
ng=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span=
></p>
</div>
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</blockquote></div>
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