Guy,
A "leak-down" test will tell you exactly where and how much potential
compression is escaping.
WFO Herb
Guy wrote:
> 1978, 1500 Midget. Blown head gasket last week. (between #3 and#4, not
> leaking into either water jacket or oil ways)
> Drove home 4 miles on 2 cylinders, with 2 "lazy" cylinders, firing but no
> power.
> Replaced gasket, torqued and then adjusted valves.
> Re torqued and adjusted again after 200 miles.
>
> Its making a distinct tapping noise when pulling in mid range revs. under
> load.
> Sounds metalic, but could just possibly be a very sharp "tchuff, tchuff,
> tchuff" noise.
> Compression tests (wet) at 185, 175, 155, 180
>
> I have checked the valve clearances again (cold) and still they seem right.
> Do I have a burnt valve on #3 ???
>
> Guy
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