air filter

[jddevel]

Intrigued as to why the rocker cover breather is only connected to the front carb on a td/tf? Wont any oil that does find its way into said pipe affect carbs performance?

[Steve Simmons]

It was common practice on many cars of the era. On M.G.s it was used through early MGB. I think the amount of oil vapor getting into the air filter is pretty minimal.

[Richard Michell]

As Steve says, it was quite common practice - e.g.Porsche 912 - but I have never understood it. Although the amount of oil should be small it is still blow-by - combustion products. It will surely reduce the amount of oxygen in the inlet air on that carburettor.

[jddevel]

O.K. so this is my problem. According to local MG specialist when fitting the rear crank modification the 1250cc engine appears to have had a major overhaul from crank up. The bores viewed with my camera still have the bore marks indicating recent attention. Virtually no carbon deposit on the piston tops. The problem I`m having is that the "breather " referred to above is sending a good deal of oil into the front carb air filter. So much so that after a shortish journey (10 miles) it`s dripping from the bottom of the air filter cover. Carbs rebuilt and problem was noticed before doing so. Where would you start looking. I`m thinking a pressurized rocker cover but if so why? Any advice or help appreciated.

[Steve Simmons]

It may be a simple case of the rings not being seated yet. They will seal better once the car has been driven a bit. Also ensure the crankcase breather is unobstructed.

[Duncan M]

Seat rings with regular motor oil in the engine. Not synthetic.