Leak down testing.

General scooter chat, any scooter related non technical info.
psychedelicropcircle
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Sun Feb 04, 2018 6:56 pm

Should the piston be at BDC before the test? also how long should the pressure hold?

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garry inglis
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Sun Feb 04, 2018 8:33 pm

Yes and leave it for 5mins to see if it drops

Muppet
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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
im not a complete idiot
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s me of the piec s are mis i g

psychedelicropcircle
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Main scooter: Series 1 li150 1958
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Sat Apr 07, 2018 7:37 pm

https://imgur.com/gallery/4ocMe

So when you read on the t’interweb “leaked pics” is this wot they are on about!

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garry inglis
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Sat Apr 07, 2018 8:38 pm

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

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HxPaul
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Sun Apr 08, 2018 9:17 am

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

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