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Cylinder head core plug


Roley94

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  • Member For: 11y 19d
  • Gender: Male
  • Location: Perth

Does anyone know what the big plug at the back of the cylinder head is called? It’s kind of like a core plug but It seems to be made of zinc or magnesium and is 10mm thick, I’d say acts as a sacrificial anode and is meant to corrode before your head does.

 

Mine has just corroded through which I have never heard of happening and I can’t find any info about it. 

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  • Member For: 9y 1m 27d
  • Gender: Male
  • Location: South Australia

There are two oil plugs and one coolant plug on each end of the head.

 

Plugs like that are in place for casting or core removal reasons from the foundry and in other cases oil galleries etc needing to be machined but then closed up again.

 

More then likely you can just fit a welsh plug, tap it and fit a bung, get a machine shop to make a new plug for you or weld a disc to it to close it up.

 

I doubt that it is made from anything special or has any other purpose other than to close the hole.

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  • Member For: 11y 19d
  • Gender: Male
  • Location: Perth

It’s definitely not made of steel or aluminium, I just thought it might have a purpose. I’ll machine a new plug out of aluminium and press it in. 

 

Thanks 

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