Machined core plugs

[Steve Bryant]

Although not original, I thought I would show you the threaded core plugs I made for my '29 cylinder block.
   

The correct plugs are the domed disc plugs you insert and expand with a dent in the center but sometime in the past  the previous owner had elected to tap these holes for 5/8" BPT plugs which had to be drilled out in order to gain access to the corrosion plugged cooling channels in the block. I got about a cup of rust out of the block.
   
I modified two modern plugs to resemble the large core plugs already in the block so that they would not look out of place.
   
   

Fiddly work but I am pleased at how they turned out.
Stephen

[steve davidson]

They look great

[cardiffrob]

Yes, very nice work.

[Zetomagneto]

They look great

Hi Steve, nice work.This is a vintage block and had screw in plugs.Later blocks have the steel disc core plugs.

[Colin Wilks]

They look smart, but I'm wondering how you intend getting a good seal. Are you going to rely on the fibre washer alone, or something else?
I 'm thinking the threads look to be parallel rather than taper, and the face of the block doesn't look like a perfect surface on which to to get a seal.

[Chris KC]

Yes I do think a thread sealant of some description might be a good idea - something with a low shear strength so it can be undone again in the future.

[Tony Press]

Although not original, I thought I would show you the threaded core plugs I made for my '29 cylinder block.


The correct plugs are the domed disc plugs you insert and expand with a dent in the center but sometime in the past  the previous owner had elected to tap these holes for 5/8" BPT plugs which had to be drilled out in order to gain access to the corrosion plugged cooling channels in the block. I got about a cup of rust out of the block.

I modified two modern plugs to resemble the large core plugs already in the block so that they would not look out of place.



Fiddly work but I am pleased at how they turned out.
Stephen

Nice job- originally there were no plugs fitted here and this modification is very useful in keeping the block clean in this area.

Mine are fitted with square  head taper plugs - hopefully easier to remove.

Cheers Tony.

[Steve Bryant]

They look smart, but I'm wondering how you intend getting a good seal. Are you going to rely on the fibre washer alone, or something else?
I 'm thinking the threads look to be parallel rather than taper, and the face of the block doesn't look like a perfect surface on which to to get a seal.

Hi Colin,
i can assure you that the treads are tapered. It took me ages to find two  5/8 BPT x 19 (I  think) TPI plugs locally.   There will be thread seal applied to the threads on installation. So the fiber washer is a secondary seal. The sealing surface on the block is better than it looks too by the way.

Stephen

[Zetomagneto]

Although not original, I thought I would show you the threaded core plugs I made for my '29 cylinder block.


The correct plugs are the domed disc plugs you insert and expand with a dent in the center but sometime in the past  the previous owner had elected to tap these holes for 5/8" BPT plugs which had to be drilled out in order to gain access to the corrosion plugged cooling channels in the block. I got about a cup of rust out of the block.

I modified two modern plugs to resemble the large core plugs already in the block so that they would not look out of place.



Fiddly work but I am pleased at how they turned out.
Stephen

Nice job- originally there were no plugs fitted here and this modification is very useful in keeping the block clean in this area.

Mine are fitted with square  head taper plugs - hopefully easier to remove.

Cheers Tony.

Tony, surprised at you saying that, I have seen numerous blocks with 2 core plugs at each end

[Tony Press]

Although not original, I thought I would show you the threaded core plugs I made for my '29 cylinder block.


The correct plugs are the domed disc plugs you insert and expand with a dent in the center but sometime in the past  the previous owner had elected to tap these holes for 5/8" BPT plugs which had to be drilled out in order to gain access to the corrosion plugged cooling channels in the block. I got about a cup of rust out of the block.

I modified two modern plugs to resemble the large core plugs already in the block so that they would not look out of place.



Fiddly work but I am pleased at how they turned out.
Stephen

Nice job- originally there were no plugs fitted here and this modification is very useful in keeping the block clean in this area.

Mine are fitted with square  head taper plugs - hopefully easier to remove.

Cheers Tony.

Tony, surprised at you saying that, I have seen numerous blocks with 2 core plugs at each end

Only two (front and back) Cylinder End Plugs BC 14 (with washers BC15) ever listed for the Cylinder monobloc.

The extra plugs are a popular modification  

Cheers, Tony.