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I dont know your engine specificly, but all engines that I have ever timmed, you use cyl #1 at top dead center as timming ref. point. does you info say to use #2? if say its a 4 cyl. #1 would be front of engine, near belts and aternator, water pump not near where engine mounts to transmission.
1. Ensure locking bolts located correctly  &  in the picture below:
CS = Crankshaft CA = Camshaft IP = Injection Pump
2. Ensure timing marks aligned . 3. Fit timing belt in clockwise direction, starting at crankshaft sprocket.
NOTE: "ISUZU" lettering on belt should be readable from front of engine.
4. Slacken tensioner pulley bolt . Push tensioner pulley against belt. 5. Ensure belt is taut between injection pump sprocket and tensioner pulley as well as crankshaft sprocket and camshaft sprocket. 6. Position tensioner lever  against tensioner pulley housing. 7. Remove locking bolts from sprockets  & . 8. Apply a load of 10 ... 12 kg to tensioner lever. Use spring balance . 9. Tighten tensioner pulley bolt to 80 Nm. 10. Turn crankshaft slowly 45 degrees anti-clockwise. Use spring balance to tension belt. 11. Repeat tensioning procedure at 45 degrees intervals for one anti-clockwise turn of the crankshaft.
NOTE: DO NOT turn crankshaft clockwise during tensioning procedure!
12. Fit tensioner lever to original position. Tighten nuts . 13. Install: Injection Pump flange , Camshaft sprocket flange , and water pump pulley. 14. Install components in reverse order of removal & refill coolant.
Drain the cooling system. Refer to Section 03-03 for the procedure.
Disconnect the battery ground cable (14301) .
Remove the generator drive belt, water pump and power steering pump drive belt, and the A/C compressor drive belt (if equipped). Refer to Section 03-05 for the removal procedure.
If equipped, remove the three A/C compressor drive belt idler pulley bolts and the A/C compressor drive belt idler pulley.
Remove the upper radiator hose bracket bolt.
Loosen the two upper radiator hose clamps and remove the radiator hose bracket bolt. Remove the upper radiator hose (8260) and the upper radiator hose bracket from the vehicle.
Remove the water bypass hose (8597) from between the thermostat housing and the water hose connection (8592) .
Remove the main wiring harness from the upper engine front cover (6019) .
Remove the eight upper engine front cover bolts and the upper engine front cover .
Raise and support the vehicle.
Remove the RH front wheel and tire assembly.
Remove the four RH outer engine and transmission splash shield bolts and two screws and remove the RH outer engine and transmission splash shield (6775) .
Use Strap Wrench 303-D055 (D85L-6000-A) or equivalent to hold the water pump pulley (8509) while removing the four water pump pulley bolts.
Remove the water pump pulley from the water pump (8501) .
Remove the crankshaft pulley (6312) . Refer to the procedure in this section.
Remove the five lower engine front cover bolts and the lower engine front cover .
Ensure that the timing marks between the crankshaft sprocket (6306) and the oil pump housing line up.
NOTE: The directional arrow is necessary to ensure that the timing chain/belt (6268) can be reinstalled in the same direction.
Loosen the timing chain/belt tensioner nut.
Remove the timing chain/belt .
Installation NOTE: Ensure that the timing marks on the camshaft sprockets (6256) and the seal plate are properly aligned. Ensure that the timing marks on the crankshaft sprocket and the oil pump housing are still aligned.
NOTE: A new timing chain/belt has three white timing marks that indicate the correct timing positions of the camshafts (6250) and the crankshaft (6303) . These marks will help ensure that the engine (6007) is timed properly. When the engine is properly timed each white timing mark on the timing chain/belt will be aligned with the corresponding camshaft and crankshaft timing mark on the sprocket. Because the white timing marks are not evenly spaced you will need to refer to the following illustration for proper timing chain/belt placement. There should be 40 timing belt teeth between the timing marks of the front and rear camshaft sprockets and 43 teeth between the timing mark on the front camshaft sprocket and the timing mark on the crankshaft sprocket .
NOTE: Verify that the camshaft timing marks are aligned with the timing marks on the seal plate, and that the crankshaft sprocket timing mark is aligned with the timing mark on the oil pump (6600) .
Install the timing chain/belt starting at the crankshaft sprocket and moving around to the camshaft sprocket following a counterclockwise path. Do not allow any slack in the timing chain/belt between the timing sprockets. After all of the timing marks are matched up with the timing chain/belt installed, slip the timing chain/belt onto the timing chain/belt tensioner .
Remember how engine crankshaft has to work with camshaft.
Normally both rollers should have notches. Painted mark could be correct (but is not original notches should point to each other. check this after tensioning. also crank camshaft without belt to see what it does when. That will assure
Sorry for the severe delay. I am personally going back to answer your unanswered question. I do not know if you still need the answer, but I am going to answer it in case you still do.
Click on the following direct Link. It has the Timing Belt Diagrams and Photos with Marks for the Camshaft and Crankshaft that you will need. It also has numerous other helpful diagrams, instructions and photo's for use.
Again my apologies... Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.com!