<div dir="ltr"><div class="gmail_default" style="font-family:arial,sans-serif;font-size:small">Well Simon, that explanation, although a bit weird, is possibly correct.</div><div class="gmail_default" style="font-family:arial,sans-serif;font-size:small">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. <br></div><div class="gmail_default" style="font-family:arial,sans-serif;font-size:small">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. <br></div><div class="gmail_default" style="font-family:arial,sans-serif;font-size:small">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.</div><div class="gmail_default" style="font-family:arial,sans-serif;font-size:small">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. <br></div><div class="gmail_default" style="font-family:arial,sans-serif;font-size:small">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. </div><div class="gmail_default" style="font-family:arial,sans-serif;font-size:small">This scenario is actually more common in braking systems. </div><div class="gmail_default" style="font-family:arial,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 incorrect adjustment can result in the brakes eventually locking up completely.</div><div class="gmail_default" style="font-family:arial,sans-serif;font-size:small">The same applies in the BJ8 where the master cylinder push rod is also "adjustable".</div><div class="gmail_default" style="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 return fully to its "rest" position resulting in the "valve" within the servo not opening.</div><div class="gmail_default" style="font-family:arial,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:arial,sans-serif;font-size:small">M<br></div><div class="gmail_default" style="font-family:arial,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:arial,sans-serif;font-size:small"><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Jun 23, 2024 at 8:57 AM Simon Lachlan via Healeys <<a href="mailto:healeys@autox.team.net" target="_blank">healeys@autox.team.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><u></u>
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<p dir="LTR"><span lang="en-gb"><font face="Times New Roman">With reference to the slipping clutch &/or over</font></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"><font face="Times New Roman">drive, I do believe that</font></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"> <font face="Times New Roman">it</font></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"> <font face="Times New Roman">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’d ne</font></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"><font face="Times New Roman">ver used before. </font></span></p>
<p dir="LTR"><span lang="en-gb"><font face="Times New Roman">Anyhow, after my wasting a lot of time and some money checking everything and getting nowhere, these guys said that</font></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"> <font face="Times New Roman">the rod in the clutch master cylinder was too long and they’d had to reduce it’s length. (Non-standard rod. Long story). So,</font></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"><font face="Times New Roman"> apparently the pressure wasn’t being allow</font></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"><font face="Times New Roman">ed</font></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"><font face="Times New Roman"> to bleed back/out and the slave cylinder remained pressurized etcetc.</font></span></p>
<p dir="LTR"><span lang="en-gb"><font face="Times New Roman">Now, if that sounds like a</font></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"> <font face="Times New Roman">muddle, it is and that’s because I’ve never delved into or fully understood the workings of the clutch master cylinder.</font></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"><font face="Times New Roman"> (Which is wh</font></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"><font face="Times New Roman">y I never thought of it during the whole affair. But nor did anyone else).</font></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"><font face="Times New Roman"> I know it’s not just a s</font></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"><font face="Times New Roman">imple pusher, like a bicycle pump, but that’s really all. I googled it and looked into my years</font></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"><font face="Times New Roman">’</font></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"><font face="Times New Roman"> worth of</font></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"><font face="Times New Roman"> collected files of advice and wisdom. But nothing found.</font></span></p>
<p dir="LTR"><span lang="en-gb"><font face="Times New Roman">Can someone just explain how the thing works so I can understand what was going on?</font></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"><font face="Times New Roman"></font></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"> <font face="Times New Roman">I should like to close the whole chapter and move on………..</font></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span></p>
<p dir="LTR"><span lang="en-gb"><font face="Times New Roman">Tha</font></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"><font face="Times New Roman">nks,</font></span></p>
<p dir="LTR"><span lang="en-gb"><font face="Times New Roman">Simon</font></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span><span lang="en-gb"></span></p>
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