IMO you need the plug. Otherwise the engine will throw oil out the
hole. On blocks with the tube, there is a baffle inside the block, and
then the tube runs about 6" up before turning back down, to prevent the
oil being thrown.
Randall
Jerry Oliver wrote:
>
> Does anyone have an idea what effect not having the breather plug in the
> block on a closed system engine would have? I was under my car (66 TR4A
> nearly finished restoration) this evening, and noticed some oil. The
> hole in the block where the breather would be on an open system car is
> plugged on the closed system. I just have the hole. I haven't driven the
> car yet. The engine was rebuilt several years ago, but the car isn't
> quite finished. I've started the engine periodically and let it warm up,
> and it seems fine. I suppose I should install a plug???
> Jerry Oliver
> Olympia, WA
> 66TR4A 61
> MGA 58
> Jaguar
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