Andrew,
Apply air at a regulated air pressure of 100 psi to a spark plug adaptor
with the piston on TDC on compression stroke. When pressurised the cylinder
will leak a small amount of air and the gauge pressure will drop below 100
Psi. An engine in good condition will have 2-3% leakdown, and will get down
to 15% leakdown on a very worn engine needing a rebuild. The plug adaptor
is made using an old spark plug and an air fitting. Valve leakage can be
heard in the exhaust pipe or inlet tract. Ring leakage causes crankcase
noises and air flow from breathers.
Cheers
Feral Errol
----------
From: Andrew Robert GREENBURY <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
Subject: Re: Engine wear
Date: Monday, September 18, 2000 11:11
errol,
sorry for my ignorance, but could you please describe the process of a
leakdown test, is it DIY?!
thanks
andrew
On Sat, 16 Sep 2000, Errol Smith wrote:
> Tom,
> If there is only smoke during the changes it may just be a bit of guide
> wear and stems seal on the valves. As you back of the throttle to change
> gear, oil is sucked down the guide into the inlet tract. At partial
> throttle or better there is insufficient vacuum to pull the oil into the
> inlet tract. I would do a leakdown test on the engine to check rings etc
> and if that was OK dont worry about it unless the smoke is more than a
> slight tinge of blue as it is just a symptom of an older engine with a
bit
> of wear. It also provide some upper cylinder lube!
> Cheers
> Feral Errol
>
> ----------
> From: Tom Richardson <[EMAIL PROTECTED]>
> To: [EMAIL PROTECTED]
> Subject: Engine wear
> Date: Friday, September 15, 2000 11:12
>
> Hi list
>
> Could somebody please offer a diagnosis on my L18? It blows a decent
puff
> of smoke during gearchanges if driven hard-ish (changing at 5000rpm).
> Otherwise not smokey at all. What is likely to be wrong and what would
it
> cost to fix?
>
> Thanks!
>
> - Tom
>
>
>
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