Q adjustable clutch pushrod.

General Chat with an emphasis on BMC Minis & Other iconic cars of the 1960's.
rolesyboy
1275 Cooper S
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Re: Q adjustable clutch pushrod.

Post by rolesyboy »

Polarsilver wrote: Mon Sep 04, 2023 9:44 pm i purchased from Minisport their adjustable Pushrod ( well made item) but had to cut the Slave Cyl; Boot to enable the new "thicker" adjustable rod to pass through..( why dont Miniport also sell me a suitable bore rubber boot with their adjustable push rod ? ) spent some time checking the clutch stops settings & swearing at my slave cyl; pull back Spring .. have no idea why that Spring needs to be that strong.. then fine tuned the adjustable push rod to trim the clutch pedal bite point.
Now Clutch is sorted.. However the 1st Gear car stationary selection is often baulked there is a need to select 2nd Gear to then be able to get into First Gear to pull away.. Gearbox is a professional built 1128 gearbox back in 2019 & now only just driven 25 miles in total .,so hope 1st Gear selection will loosen up as gearbox gets some miles .. any suggestions why 1st gear is difficult to select ?
Not quite as bad as yours sounded but I built an 1128 box 15 years ago. The box was/is lovely but from the get go I had to force first gear and reverse with a firm 'push'. Otherwise it was perfect. To counter this I usually selected second gear on start up, keeping my foot on the clutch then moved to first or reverse immediately. Everything else throughout the box was crisp and clean. No graunching while on the move etc so I lived with it.
It still niggled me though but feared the worst. I really couldn't be arsed stripping the gearbox as I always presumed it was going to be an internal fault.

12 years later curiosity got the better of me. When I stripped it down it turns out I had made the mistake of fitting what I thought was a new clutch lever arm on to my fresh built engine at the time. On closer inspection I had fitted a zinc plated 'used' arm. The bobble on the clutch arm was worn.

I fitted a brand new standard Minispares arm and pushrod assembly with no real expectation but this was an easy job by comparison to an engine gearbox out job. Cured the whole problem inside an hour. Gearbox is now perfect. Couldn't believe the transformation for what effectively looked such a marginal amount of wear on the clutch arm
I only wish I had realised this sooner.

Hope that helps.
Rolesyboy
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Peter Laidler
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Re: Q adjustable clutch pushrod.

Post by Peter Laidler »

More words of pure wisdom from Mark...... But mark my words Mark and Tim, the same 'adjustable push-rod' querie will raise its head again within a year.

Remember also that if you do build-up the ball on the lever arm with weld, then it's got to be case hardened afterwards. And that ball don't wear on its own. It takes with it the axis hole, the pushrod axis hole and the pins too. Bore and sleeve them too to eliminate ALL accumulative error. Levers are ALWAYS loaded unevenly at their fulcrum or axis points....... that's why they are levers!

You can bent the arm until the cows come home but bending it.......... Anyway, rant over for today. (Maybe I've been listening to that James O'Brien LBC bloke too much!)
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