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Leak down testing.
Posted: Sun Feb 04, 2018 6:56 pm
by psychedelicropcircle
Should the piston be at BDC before the test? also how long should the pressure hold?
Re: Leak down testing.
Posted: Sun Feb 04, 2018 8:33 pm
by garry inglis
Yes and leave it for 5mins to see if it drops
Re: Leak down testing.
Posted: Sun Feb 04, 2018 8:58 pm
by Muppet
piston at bdc before the test: see if it holds pressure if it does then as a better test slowly rotate crank wait till pressure settles check for pressure drops; then spin again: do it slowly through one full rotation in stages it’ll give a thorough test of seals and crank under rotation; the gauge will fluctuate as you turn the crank itll settle back when you stop; max air loss 1psi per min; try to get lower than that; test at between 5psi min and 7psi max
Re: Leak down testing.
Posted: Sat Apr 07, 2018 7:37 pm
by psychedelicropcircle
https://imgur.com/gallery/4ocMe
So when you read on the t’interweb “leaked pics” is this wot they are on about!
Re: Leak down testing.
Posted: Sat Apr 07, 2018 8:38 pm
by garry inglis
Yes if you have suspected leak spray with soapy water find leaks fix and retest around mag housing or base gasket can be common areas
Re: Leak down testing.
Posted: Sun Apr 08, 2018 9:17 am
by HxPaul
Muppet wrote: ↑Sun Feb 04, 2018 8:58 pm
piston at bdc before the test: see if it holds pressure if it does then as a better test slowly rotate crank wait till pressure settles check for pressure drops; then spin again: do it slowly through one full rotation in stages it’ll give a thorough test of seals and crank under rotation; the gauge will fluctuate as you turn the crank itll settle back when you stop; max air loss 1psi per min; try to get lower than that; test at between 5psi min and 7psi max
+1