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Good to clean out the threads in the block with a thread tap if you've got one. Surprising how cruddy they get.
Remember to make sure there is nothing (grease. oil, crud, gasket debris) in the...

Simply smarter! Love it when a cunning plan comes together.

Impressive!

Way to go man!

i've used hylomar before, if the head is machined properly and the top of the block is nice and clean, theres not much point, not with these if u use a quality head gasket.
i would also suggest a...

Dunno about the Hylomar. Patrolapart do heads. Click on the Patrol Parts button at the top of the page. Type in Tb42 head in their search bar and you will see a few options.

If the spark is uneven such as a lead breaking down you would probably not see anything. But if the plug is faulty or gapped too close you could see a metal deposition, not only from one terminal to...

Thats handy Phil. I would think if there was corrsion on all plugs, whats on that guide would be it. But only on one plug, gotta be something else.

Would a dodgy lead possibly cause this? Or help...

Have a look here
https://www.onallcylinders.com/2012/12/20/reading-101-how-to-read-your-spark-plugs/

It could just be leaking into that pot when the engine cools, then the warmth in the pot "steams' away the coolant giving the spark plug a corroded coating. Corrosion needs moisture to happen.

I would pull the plug and simply replace it and monitor. I seem to remember build up can occur from the 'corona' of the spark itself if the plug gap or plug itself are faulty, gap usually being too...

Cracked head or gasket letting a little coolant into that pot?

Looking at the images for the mechanical pump, it is basically the same oil splash lube as my ol' Fairmont. I just made a metal plate that matched the hole to blank it off. But I hope someone who has...

A friend of mine had an early navara diesel non-turbo. It was very heavy on fuel and didn't go very fast.

Fair enough. 90% of Ebay parts like starters and alternators are cheap rubbish sold by the same people who just want to flood the market with rubbish. Expect to get what you pay for...