Outer Limits 4x4 Board

Gday all

I will start with the technical bits so they can be kept in mind:-
93 GQ TB42 Carby, pirahna timing, duel fuel, head recoed about 3yrs 80,00kms ago, runs valve saver upper lubricant

Just came from changing the oil and plugs in my truck, I found that no. 6 plug was really hard to get out ( the thing was as tight as a proverbial fish) and I know that it was not that tight when I put it in 10, 000 kms ago, the thread looked OK on the plug... BUT I have found that the base of the plug (electrode) was fairly caroded.

I have been loosing abit of coolant with no obvious leaks. The truck has been running Ok with no real discernible loss of power or idle, timing etc seems to be same as usual, Running temp is about the same but very occasinally has been hitting the 2/3 mark usually doesn't go above 1/2, and the oil I just pulled out of her was pristine with nmo water/milkiness.

Any suggestions?? is it simply a head gasket that has gone around no. 6 cylinder or is the head gone again? And any suggestions about the plug being tight the new one was tight to get in

Allother cylinders had no probs with

Thanx any help appreciated

Sounds like the gasket is gone above #6. Same plug symptoms as mine except I was pushing collant out the overflow bottle too.

I just fitted a new head to my TB 42 on gas. From what I can gather the crack usually starts at the front cyl and works its way back. This is what orger engines told me anyway they see a hell of alot of these heads fail, particularly on gas as they get so bloody hard over time.
To identify mine as having a stuffed head i simply pulled the cap off the radiator when still cold and watched for bubbles and sure enough.

An easy way for u to check is to stck the radiator overflow tube into a coke can and cable tie it in your engine bay, if it keeps filling up you are pressurising your cooling system with combustion pressure ie head gasket or head failure.

If you are after a temporary fix try the metal filings crap from Bursons for busted heads it worked fine on mine but I bit the bullet and got a new head eventually. I also used this stuff in a bulldozer years back and it still going strong.

hope you get it sorted
Brunsy