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IME you should always hear some hissing when putting compressed air into =
a cylinder, ring sealing isn't perfect.
Removing one plug at a time may show which cylinder or cylinders are at =
fault if the pulsing lessens.
Air pulsing out of the rocker cover definitely indicates a major =
compression leak from somewhere, despite your compression readings. =20
Having said that AFAIK an MGA should also have a 'road draught tube' =
hanging down from the front tappet chest cover, which is another route =
for air to pass in and out of the crankcase. Perhaps that is blocked.
PaulH.
----- Original Message ----- kcase ventilation
I have an MGA 1600, under 2,000 miles since the engine rebuild. While =
working on an unrelated issue, I discovered that the front air filter =
was thoroughly soaked in oil. The source was the vent hose between the =
air filter and the valve cover. I found significant (to my lack of =
experience with this system!) pulsing air blowing through the hose at =
idle.
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<DIV><FONT size=3D2>IME you should always hear some hissing when putting =
compressed air into a cylinder, ring sealing isn't perfect.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV>
<DIV><FONT size=3D2>Removing one plug at a time may show which cylinder =
or=20
cylinders are at fault if the pulsing lessens.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV></DIV>
<DIV><FONT size=3D2>Air pulsing out of the rocker cover =
definitely indicates=20
a major compression leak from somewhere, despite your compression=20
readings. </FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV>
<DIV><FONT size=3D2>Having said that AFAIK an MGA should also have a =
'road draught=20
tube' hanging down from the front tappet chest cover, which is another =
route for=20
air to pass in and out of the crankcase. Perhaps that is=20
blocked.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>PaulH.</FONT></DIV></DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; =
PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- kcase=20
ventilation</DIV>
<DIV><FONT size=3D2></FONT><BR></DIV>
<DIV dir=3Dltr>I have an MGA 1600, under 2,000 miles since the engine =
rebuild.=20
While working on an unrelated issue, I discovered that the front air =
filter=20
was thoroughly soaked in oil. The source was the vent hose between the =
air=20
filter and the valve cover. I found significant (to my lack of =
experience with=20
this system!) pulsing air blowing through the hose at=20
idle.</DIV></BLOCKQUOTE></BODY></HTML>
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