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How did the coolant get onto the outside of the cylinder head?

Did you test the glow plugs you removed? Have you confirmed that the glow timer is work? (test lamp on the glow rail when you turn...

Make sure you replace it with a genuine Toyota part not some POS from China! Might as well use a genuine head set as well.
It's been a few years since I worked on the L series engines but they are...