Guarantee void if removed tag on head?

jp928 · Postby **jp928** » Fri May 13, 2016 11:47 am

Recently bought an almost complete engine - NA8, 94-95 I think, off ebay. Plan is to build a replacement for current poor oil pressure unit. Possibly a grey import unit.
Just noticed an oddity on the back of the head (BP05) - round ally disc ~12mm dia, with a bit of grey non-hardening gasket around it, with the words 'Guarantee Void if removed' around the edge.

Anybody ever seen anything like this before?

jp 92 NA6, 96 na8 in a clubbie with turbo.

Postby **NitroDann** » Fri May 13, 2016 12:29 pm

It lets the reconditioner know if the engine overheated.

Dann

jp928 · Postby **jp928** » Fri May 13, 2016 1:10 pm

Ok, good. What changes if it has overheated?

jp

Postby **NitroDann** » Fri May 13, 2016 1:18 pm

Colour I think. Maybe the glue fails a X degrees, not sure. But that's what its for.

sailaholic · Postby **sailaholic** » Sun May 15, 2016 6:50 pm

Side note is your low oil pressure unit based of the stock gauge. They are notoriously inaccurate.

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pie5 · Postby **pie5** » Sun May 15, 2016 11:48 pm

It's called a heat tab. The center will melt if the head gets too hot. In case there is a failure of the head. Lots of engine reconditioners use them.