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Much thanks for your insight.
Regards.

Awesome advice. Will do the rest of the plugs. Do I need to remove exhaust manifold to get at welch plugs?

Thanks heaps for all yr info ... yes it is a 30mm plug.

Vehicle is a '99 Patrol. Bought it with a water leak already. Runs smooth and no exhaust or oil in water and no water in oil so no sign of any overheating damage.

Hi There,
Thanks heaps to everyone who posts such awesome information!!!

I thought I had a leaking water pump, but discovered that welch plug near the crank at the front of the engine is...