Core plugs

[S Garrod <S.Garrod@sheffield.ac.uk>]

Has anyone relaced the front core plugs on a 1300 engine.
The water in my engine is flowing out of a small hole in the front of the 
block at the top left of the timing chain cover (and partially obscured 
by it). I must admit to not knowing what is going on but a look at an 
exploded diagram of the engine seems to indicate that this is the 
position of a core plug. Can this be replaced in situ. Can it be sealed 
in some way?

Thanks.

Simon Garrod - 79 Spitfire (with mk4 engine)