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September 29th, 2008

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Q & A: MGB Engine Problem

Wednesday January 04th, 2006
Q & A, MGA, MGB, MGC, MG T-Type, Midget
Hi John, I have a problem with my 71B that I cannot figure out. I have
switched out a motor from my parts car (79B) into my 71. The 71 was leaking
badly and was 15 years old. The new engine's #3 cylinder is dead. There is
fire to the plug as well as the other three. The engine fires right up and
seems to run good (except for the miss). After the engine reaches running
temperature (just above 'N") I am getting quite a bit of grey smoke from the
exhaust especially after coming to a stop and then taking off ( I expect
this is unburnt fuel from the #3 cylinder building up in the exhaust). I
have replaced valve seals, rebuilt the carb (a Weber DGV), installed new
plug wires, plugs, distributor cap and rotor. It is equipped with a new
Petronics Igniter electronic ignition module. I have checked the compression
and it seems to be good (#1 140lb, #2 145lb, #3 155lb and #4 165lb all plugs
out, reading taken after 6 revolutions (needle stopped climbing)). Any
ideas?
Thanks for your help!

Mark
Mark!

Very interesting. If the compression is good then the engine is OK,
unless the cam lobe(s) for #3 are just horrid. Watch the engine run with
the valve cover off. Are the #5 and #6 valves opening the same dist... read more