No they are right handed righty tighty, lefty Lucy threads. The bolt is in there pretty tight though so it can be hard to get out with hand tools. Most of the time when you pull on it hard enough to lossen it you will spin the motor before it comes loose. You will probably need an impact wrench or find some way to keep the motor from rolling over.
Standard rh threads
On Google images, search "diagram of pulley system for 1998 Isuzu trooper"
More than likely it is right hand thread.
The bolt is normal thread, righty tightly, lefty loosely.Using a cordless Impact gun is the easiest way to remove it without having to hold the pulley from turning. It should be a 15/16 or whichever size is equivalent in metric measurements.
on the right side of the engine
92
From the generator over the idle pulley the over the power steering pump pulley then down aound the bottom of the ac compressor, up and over the water pump, around the bottom of the crankshaft then up over the tensioner, ending at the underside of the generator.
injection pump crankshaft camp
No
on a1990 Isuzu 2.6 and 2.3 I thing you mean the main bearing caps for the crankshaft 72.3 (+ or -) 7.2 lb-ft
It is located between the camshafts right behind the camshaft pulley's.
passenger side in the midle of motor behind alternator and front or motor mount