I visited the 80 MGB at question again today.
After I researched, then Lawrie pointed out, it
does indeed have the vented filler cap where it
shouldn't.
This car has a Weber DGV carb. I don't know much
about the Weber (I have dual SUs on my 76 with a
working ventilation system). The rocker cover
vent pipe (stock rocker cover) goes to one of the
canisters (80 Bs have two). The side cover
(tappet chest) goes to a plastic elbow on the
bottom of the carb.
On the canister closest to the drivers side on the
front port, there is a broken off connection. It
went to a hose that was plugged up. If you run
the car w/the vented cap, smoke comes out of the
cap and out of that hole in the canister. If I
install my non vented cap, no smoke comes from the
cap, but more comes from the canister hole.
This is an 80 w/untouched engine, 77000 miles,
engine seemingly in good shape (good oil pressure,
and no smoke from the exhast ever that I could
tell from driving it).
My job was to try to tackle some of the oil
leaks. I fixed the rocker cover gasket leak, but
the manifold gasket leaks, the sump gasket leaks,
and the side covers leak. I'm afraid that if I
fix the leaks and install the non vented cap, it
may leak oil again due to pressures?
Any thoughts on how the Weber is plumbed?
Thanks,
--
Tyson Sherman
76 MGB undergoing heart transplant / engine
blockectomy
mts3@ra.msstate.edu
ICQ# 10494960
http://www.tecinfo.com/~tsherman
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