mk1-forum.net

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!

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.

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

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

[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

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

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?

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.