core plugs

[mattyguk1]

hi all,ive brought some new core plugs to fit into my 1962 mk1.after removing the old ones and cleaning everything up the new ones slip in easily...a bit to easily i think? is this correct,am i missing something? any help would be appreciated as its the first time ive done core plugs!

[InimiaD]

Strange. The later A + blocks had different size core plugs.
Have you got the correct ones, just in case.?

They should be 41.4 mm and convex shaped.

[mattyguk1]

the ones i have are the thick dished type not the thin tin ones?how tight are they supposed to be?

[InimiaD]

Not changed one before, but i should imagine it will be an interference fit at least.
The part No is 2K8169.

[1071bob]

[These dished type core plugs are for the small bore engines 850,998 etc.
The correct way to fit them is:-
clean out all the rust and muck from the block
fit the new core plug with dish outwards
hit/dent the centre area of the dish with a hammer and drift, this expands the diameter of the plug until its a tight fit in block. a bit of sealer around the rim would help.
Not the most hi-tech design but fairly common in the sixties

[mattyguk1]

thanks bob,i had an idea that might be the way but thought it a bit primitive!not looking forward to hammering them....

[mattyguk1]

job done,guess ill see if its ok when i refit the engine next weekend! if theres any leaks from them is it possible to spread them a little more when the engines fitted?

[mk1]

Always make sure the seat of the hole in the block is as clean as you can get, & I usually use a bead of Araldite around the edge of the plugs to be on the safe side.