On 05/10/13 17:58, Nigel Graham wrote:
Ferg,
I had an experience similar to Nigel. My unit had been stored for a
similar time.
After soaking in various fluids for several weeks, using heat and
compressed air to no avail, I borrowed the hand pump from a hydraulic
press which finally shifted to piston.
The piston was dry and so badly corroded I turned up a new one, also
adding concentric grooves to the rear face to allow fluid easier access
to the piston when fully retracted. The bore of the cylinder I was able
to salvage.
Regards
Lance Sandford
> Hi Ferg,
>
> I was about to respond when Nev replied with the same suggestion.
> I have recently worked on two XS Mono kits that have been well stored
> (warm and dry) for the last twelve years.
> As a matter of course, I strip and inspect all components before
> assembling and on both I found that the brake slave cylinder pistons
> were stuck fast.
> Using a compressed air line to pop them out, I discovered that both
> were covered in a glutinous substance (see Picture).
> I am not sure what this is but would hazard a guess that it is old
> hydraulic fluid that would have been used to lubricate the piston
> during manufacture and being hygroscopic, has absorbed water over the
> years and degraded.
>
> I would suggest dismantling all of your hydraulic components and
> carefully cleaning and reassembling with fresh hydraulic fluid. I
> pretty sure that you will then be able to bleed the system as
> described by others.
> As an aside, I am certain that this is the cause of high brake disc
> and pad wear with associated hot discs that other mono pilots have
> complained about over the years.
>
> If you intend to keep the aircraft and have a desire to reduce
> subsequent maintenance, I would also highly recommend having all the
> components anodised. I have done this to mine and can send picture
> offline if you are interested.
>
> Nigel
>
> On 04/10/2013 04:29, f.kyle@sympatico.ca wrote:
>>
>> Cheers,
>>
>> I am having the worst time trying to force the fluid up into the
>> brake system from the bleed valve on the main wheel. We opened the
>>
>> upper fill plug to relieve what we thought to be any resistance and
>> with a syringe attempted to fill the various parts.
>>
>> First of all the syringes leaked somewhat and we did our best to
>> press fluid into the wheel portion but after 250 ml, and much huffing
>> and puffing, have seen little result above, even though we induced a
>> vacuum from the top to expedite matters..
>>
>> Any hints or kinks as to a more perfect procedure? All ideas accepted
>> at par.
>>
>> Thanks, Ferg
>>
>> *
>>
>>
>> *
>
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