1968 Mk 2 Cooper S
Discussion
I am in the process of putting back the hydrolastic suspension on my Mk 2 Cooper S for which I have all of the parts. I have been told that the hydrolastic displacers cannot be checked before being fitted - does anyone know if this is true or if there is in fact a way of testing them ?
easy.
screw a valve into the end. pump it up to about 100 odd psi.
check the big end for splits etc.
check the end with the pipe for de-laminiations.
check the pipe for splits, cuts and abrasions.
leave it pressured overnight, then compare the psi to make sure it hasnt dropped (it may drop a little due to trapped air.
pump it up to 200 psi.
repeat above, but dont leave overnight (about 10 min should do it)
if posh, make a small test rig with a sping in it so you can 'pre-load' the displacer.
then you can leave it at 200 - 250 psi overnight.
any bad ones will look nasty at the 'big end' once presurised, i once had one blow the entire pipe clean out by its root. which was a surprise!
hydro
screw a valve into the end. pump it up to about 100 odd psi.
check the big end for splits etc.
check the end with the pipe for de-laminiations.
check the pipe for splits, cuts and abrasions.
leave it pressured overnight, then compare the psi to make sure it hasnt dropped (it may drop a little due to trapped air.
pump it up to 200 psi.
repeat above, but dont leave overnight (about 10 min should do it)
if posh, make a small test rig with a sping in it so you can 'pre-load' the displacer.
then you can leave it at 200 - 250 psi overnight.
any bad ones will look nasty at the 'big end' once presurised, i once had one blow the entire pipe clean out by its root. which was a surprise!
hydro
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