1984 VF500FII carbies and other stuff

Discussion in '1st & 2nd Generation 1983-1989' started by Simon74, Jun 15, 2019.

  1. Simon74

    Simon74 New Member

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    Master cylinder now makes pumpy pumpy squirty squirty. But seeing as we have one end off, and it's full-o-crap, might as well have the other end off, right?

    Slave cylinder stucker than a stuck thing. 8bar of compressed air up the oozit, and it's not shifting in an outward direction. Managed to move it inwards with the help of a couple of teflon cylinders and a vice, but outwards is no go. Best option seems to be to chuck it back on its pipe and push it out with the hydraulics. Which system is now totally empty …
     
  2. Simon74

    Simon74 New Member

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    Grrrrr.

    Master cylinder is now pumping reliably. Unfortunately, all it's pumping is air from where the lever goes in, I suspect the boot not only stops crap getting into the system, but also air. I think I'm after master and slave cylinder rebuild kits.
     
  3. Simon74

    Simon74 New Member

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    So, I have clutch slave and master cylinder rebuild kits winging their way to me at the moment. But I still needed to get the slave cylinder apart, and as the brakes needed a flush / bleed anyway, as well as changing the master cylinder cap screws (mangled to fuck by the previous owner, I actually needed to drill the head of one of them off), I figured "what the hell". Took the slave cylinder off its line (again), removed the line from the front right caliper, connected it to the slave cylinder, bled out the majority of the air, and pushed the piston pretty much out using the brake. Then back on with the caliper, chase the old fluid out with new, and bleed the system. Laaaaarvley. A bit of air to the slave cylinder inlet, a healthy "pop", and I had one disassembled slave cylinder.

    But what, dear reader, did I find in there? Click through to see.

    [​IMG]
    The photo actually makes the inside of the cylinder look way better than it is. But bear in mind that the piston should be shiny, looking like stainless steel Cleanage is certainly required. Total flush of the hoses and lines planned before fitment of the rebuild kits (when they eventually arrive).
     

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  4. Simon74

    Simon74 New Member

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    Slave cylinder and piston now cleaned. Lines flushed, unpleasant crud removed. New rubber mounted on the "go roundy roundy" bits that touch the road (yay tyre machine at work). Right hand exhaust finally unmounted (necessary to remove the rear caliper which latter was necessary for refitting of the rear "go roundy roundy" bit). Rear caliper looked at from a distance, then scrutinised more closely, dismounted, dismantled (Ugh, more or less the same shite as in the clutch slave cylinder), cleaned, drained and refilled. Drum fingers waiting for clutch rebuild kits, currently somewhere between Poland and France.

    Remove tank in order to check the state of the air filter, discover the petcock is pissing fuel out even when in the "off" position. Have a slight sinking feeling. Pull the dipstick. That's overfull, and smells suspiciously petrol-y. Bastard bastard bastard. Drain oil and petrol mixture, refill. Do not refit tank. Add another thing to fix. Bastard bastard bastard.
     
  5. Diving Pete

    Diving Pete Member

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    Don't worry my tank came off 4 times - along with the carbs !!
    Had issues with both on a few of mine.. lol
     
  6. Simon74

    Simon74 New Member

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    The bits are here for the clutch. Took a while, given that it's intra-EU postal services all the way. They look to be correct at first glance, we'll find out when I try to fit them.
     
  7. Simon74

    Simon74 New Member

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    So, clutch is back together. Unfortunately...

    Reverse bleed technique applied to fill up the system, and start pumping the lever. Bubbles start coming out the bottom, yay, lots of bubbles, yay, that should be done - more bubbles - hold on, the level in the MC reservoir isn't dropping, bastard thing should be empty by now. Master cylinder appears to be doing nothing but pump air into the system.

    Any ideas, lads and lasses?

    I'm sure I'm doing something wrong, but buggered if I know what it is.
     
  8. Diving Pete

    Diving Pete Member

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    i generally find that gravity works best on the clutch.. However, sometimes a mix of styles are needed to overcome bubbles. lol
     
  9. NorcalBoy

    NorcalBoy Member

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    Bench bleed the master first, make sure it's building pressure. This is best done without the line attached. Put a temporary bolt in it so you can confirm the master is working properly. If the master isn't building pressure, disassemble and make sure the rubber pistons are going the right direction. Need to confirm this first.
     
    Last edited: Aug 11, 2019
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