I posted other day about a tapping my engine makes before the boost comes on, and some white smoke when idling before the engine is warm. I thought it might be an injector (and it still may be), but someone said his made a tapping sound before he had his valves adjusted. It makes the tapping with or without the Diablosport Predator on. The truck only has 34K on it. Wondering if anyone else has had this problem, and if so how do you adjust the valves.

 

Actually I have an 05 5.9l and would like to know how to adjust the valve as well... I'm comming up on 150k and understand this is something that should be done as a routine maintenance.

 

STANDARD PROCEDURE - VALVE LASH ADJUSTMENT AND VERIFICATION
NOTE: To obtain accurate readings, valve lash measurements AND adjustments should only be performed when the engine coolant temperature is less than 60° C (140° F).

The 24–valve overhead system is a “low-maintenance” design. Routine adjustments are no longer necessary, however, measurement should still take place when trouble-shooting performance problems, or upon completion of a repair that includes removal and installation of the valve train components or injectors.

Disconnect battery negative cables.
Remove cylinder head cover (Refer to 9 - ENGINE/CYLINDER HEAD/CYLINDER HEAD COVER(S) - REMOVAL).
Using the crankshaft barring tool #7471–B, rotate crankshaft to align damper TDC mark to 12:00 o'clock position.
If both number one cylinder rocker levers are loose, continue to next step.
If both number one clylinder rocker levers are not loose, rotate crankshaft 360 degrees.
With the engine in this position, valve lash can be measured at the following rocker arms: INTAKE 1–2–4 / EXHAUST 1–3–5. Measure the valve lash by inserting a feeler gauge between the rocker arm socket and crosshead. Refer to VALVE LASH LIMIT CHART for the correct specifications. If the measurement falls within the limits, adjustment/resetting is not necessary. If measurement finds the lash outside of the limits, adjustment/resetting is required. VALVE LASH LIMIT CHART INTAKE EXHAUST
0.152 mm ( 0.006 in.) MIN. 0.381 mm (0.015 in.) MIN.
0.381 mm (0.015 in.) MAX. 0.762 mm (0.030 in.) MAX.
NOTE: If measured valve lash falls within these specifications, no adjustment/reset is necessary. Engine operation within these ranges has no adverse affect on performance, emissions, fuel economy or level of engine noise.



If adjustment/resetting is required, loosen the lock nut on rocker arms and turn the adjusting screw until the desired lash is obtained:
INTAKE 0.254 mm (0.010 in.)
EXHAUST 0.508 mm (0.020 in.)
Tighten the lock nut to 24 Nm (18 ft. lbs.) and re-check the valve lash.
Using the crankshaft barring tool, rotate the crankshaft one revolution (360°) to align the damper TDC mark to the 12 o'clock position.
With the engine in this position, valve lash can be measured at the remaining rocker arms: INTAKE 3–5–6 / EXHAUST 2–4–6. Use the same method as above for determining whether adjustment is necessary, and adjust those that are found to be outside of the limits.
Install the cylinder head cover (Refer to 9 - ENGINE/CYLINDER HEAD/CYLINDER HEAD COVER(S) - INSTALLATION).
Connect the battery negative cables.

 

Give this a try. Hopefully I don't get in trouble for bringing this over, but it is well written and a good resource.

http://www.dodgeforum.com/m_910497/tm.htm