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#1 Plugging the two extra cooling holes in an XJ6 head.
Posted: Sat Jul 07, 2018 8:42 pm
by 3edc4rfv
The XJ6 head I've been rebuilding for my E is almost done. Can I tap the two extra holes in the rear (they're pretty close to a 1/4 pipe thread) and use brass setscrews as plugs (with some red Locktite)? While I can machine aluminium plugs, it doesn't seem necessary, unless folks are going to tell me that they've had problems with brass or copper ones (different expansion maybe)?
Thanks.
#2 Re: Plugging the two extra cooling holes in an XJ6 head.
Posted: Sun Jul 08, 2018 1:51 am
by PeterCrespin
That would be fine. Alloy is advocated if the head is to be skimmed when all head work is finished.
#3 Re: Plugging the two extra cooling holes in an XJ6 head.
Posted: Sun Jul 08, 2018 7:31 am
by Tom W
You might get problems with galvanic corrosion using brass plugs.
#4 Re: Plugging the two extra cooling holes in an XJ6 head.
Posted: Sun Jul 08, 2018 10:11 pm
by Series1 Stu
No. There's a very low risk of galvanic corrosion between bread and aluminium.
Regards
#5 Re: Plugging the two extra cooling holes in an XJ6 head.
Posted: Mon Jul 09, 2018 6:18 pm
by Tom W
There’s some risk of corrosion as brass an aluminium are separate on the galvanic scale.
https://www.fastenal.com/content/feds/p ... rosion.pdf
Brass and aluminium together is not ideal, even though they do already exist in together in the cooling circuit. I always find it nerve wracking removing a temperature sender from an aluminium casting if it’s not been removed for a very long time.