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Looks like its over charging. I think around 14.8v is the max they should be putting out....Voltage regulator is stuff by the looks of it. Hopefully one of the more knowledgeable members will see...

Maybe something to do with one having a clutch pulley, the other having a fixed pulley....... just guessing

http://www.nissanpatrol.com.au/forums/showthread.php?479-3-0lt-GU-Patrols-Grenade-Facts&highlight=grenading

Just by chance found an old thread on "grenading". Maybe some useful links there...
It's the last one on the General Discussions page.

Hi Magician. From what I've seen elsewhere on forum...
EGT = exhaust gas temperature
NADS = Nissan Anti Detonation System(?) - see other threads...
Apparently 3.0s are famous for eng failure, but...

Install NADS and EGT gauge and boost gauge as you go. That way you will be ably to see how your rebuilt engine is going from the get go.