Yes, it has to be timed or it will shake the engine all to pieces.
See section 9 - page 246 in the 05 Factory Service Manual.
As Geordi stated, it involves using a pin punch to index the balance shafts for proper alignment.
You can view the Factory Service Manual online at:> http://www.colorado4wheel.com/manuals/Jeep/KJ/
05 FSM:> http://www.colorado4wheel.com/manuals/J ... Manual.pdf
Review the FSM for the full procedure and information!
This is part of what it says:
NOTE: Before installation of the balance shaft assembly, the # 1 cylinder must be brought to TDC, or the 12 O’clock position. There is a line on the front of the crankshaft hub, next to the front crankshaft bolt, that may assist the alignment.
(1) Remove the vibration damper and roll engine over by hand until the witness line on the front of the crankshaft hub is at the 12 O’clock, or TDC position. Once the # 1 cylinder is brought to TDC, the balance shaft assembly can be installed.
CAUTION: CARE MUST BE TAKEN DURING THE INSTALLATION OF THE DRIFT OR PUNCH. THE BACK SIDE OF THE COUNTER WEIGHTS ON THE BALANCE SHAFTS MUST BE IN THE UP POSITION BEFORE INSERTING THE TOOL INTO THE HOUSING.
(2) With balance shaft assembly on work bench. Insert a drift of a punch into balance shaft assembly alignment hole. This will ensure proper balance shaft to crankshaft timing after assembly (Fig. 156).
(3) Install the new crankshaft carrier pin O-rings, balance shaft assembly and retaining bolts. Torque bolts to 32.4N·m (24 ft. lbs.), and remove the punch from the alignment hole.
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