Spi Head Plugs
Posted 16 May 2018 - 04:47 PM
Posted 16 May 2018 - 07:43 PM
are you on about the brass plugs in the head? they are not all present and they are not all the same size.
pictures of your perceived problem.
Posted 16 May 2018 - 08:05 PM
Some heads had solid plugs and the later ones use a miniature freeze style plug and I'd guess here that your friend has the latter.
When these type need replacing as there is a shoulder in the head, I turn up solid brass plugs and fit them proud with sealant, then a light skim of the deck. This way, you can be sure they won't move, which was an issue in the earlier heads and can be in these if there's room for them to move.
In the earlier heads that don't have the shoulder, I have threaded cast iron plugs that I fit and again, skim the head deck. Brass plugs in these heads is asking for trouble, I'd say around 50- 60% of these I've come across have shifted and caused problems.
Posted 16 May 2018 - 09:37 PM
I've attached a picture of my spare head, showing the 3 plugs circled.
The top left one is the one that has about a 3mm hole in it.
I'm hoping that there is a part number for these as that would be the ideal fix, just to replace it.
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