Should the leak down test be done on a cold or warm engine? Is this a test most
mechanics do or can do? Seems like a good test to routinely do.
thanks,
Linda
RacerY@comcast.net wrote:
>Graeme's right about the leakdown test, and his diagnosis chart's right on.
>A few further observations;
>
>> Over time (a couple of minutes) you then observe whether and how much the
>> compressed air leaks away.
>
>Usually, we use a gauge with a small orifice in it, and supply compressed air
>at 100 psi. Then, measuring the pressure on the piston side, you get a
>straight percentage: if the supply side holds 100psi, and the cylinder holds
>92, then you have "92% leakdown". But either method works.
>
>If you really do have good leakdown and compression (the leakdown test really
>can't tell you the condition of the cylinder walls, and the compression test
>can do that) I'd suggest that the head gasket's NOT blown.
>
>fwiw,
>Toby
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