Valve adjustment on a 3rd gen?

[JaMan]

I have done a few valve adjustments on 2nd gens but what is the process on a 3rd gen? The truck is a 04. 5 and how do you find TDC?



Thanks Jared

 

[jwilliams3]

There is a marking on the damper "TDC".

 

[tkerrigan]

Use alternator nut to turn engine until timing mark is pointed down, paint mark white, adjust valves with mark pointed straight up 12 o'clock. Half of valves, then turn engine one turn for rest.

 

[jwilliams3]

Tom on the crankshaft the TDC mark with show itself up at true TDC and at 180* out.

 

[tkerrigan]

Doesn't make any difference, half gets done at TDC, the other half gets done at 180° out.



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.

1. Disconnect battery negative cables.

2. Remove cylinder head cover (Refer to 9 - ENGINE/

CYLINDER HEAD/CYLINDER HEAD COVER(S) -

REMOVAL).

3. Using the crankshaft barring tool #7471–B, rotate crankshaft to align damper TDC mark to 12:00 o’clock position.

a. If both number one cylinder rocker levers are loose, continue to next step.

b. If both number one clylinder rocker levers are not loose, rotate crankshaft 360 degrees.

9 - 2578 ENGINE - 5. 9L DIESEL - SERVICE INFORMATION DR/DH

4. 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.

5. If adjustment/resetting is required, loosen the lock

nut on rocker arms and turn the adjusting screw

until the desired lash is obtained:

² INTAKE 0. 254 mm (0. 010 in. )

² EXHAUST 0. 508 mm (0. 020 in. ) Tighten the lock

nut to 24 Nm (18 ft. lbs. ) and re-check the valve

lash.

6. Using the crankshaft barring tool, rotate the crankshaft

one revolution (360°) to align the damper

TDC mark to the 12 o’clock position.

7. 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.

 

[Matt400]

Doesn't make any difference, half gets done at TDC, the other half gets done at 180° out.

6. Using the crankshaft barring tool, rotate the crankshaft

one revolution (360°) to align the damper

TDC mark to the 12 o’clock position.

180 out on the cam gear but 360 on the crank gear

 

[MLee]

How does this barring tool 7471-B differ from the one used on the 12 valve trucks?

Got to do my sons 04. 5.

Marv.

 

[tkerrigan]

Don't use the barring tool, use a 3/8" dr ratchet and socket to fit the alternator nut. Paint the timing mark white so you can see it hit the 12 Oclock position from the top while turning the nut.

 

[RPolidora]

How is the timing mark on there? is it an actual line cut into the damper like most? just one line?



thanks

 

[RankRam]

How is the timing mark on there? is it an actual line cut into the damper like most? just one line?



thanks

Yes it is an actual line cut into the damper and it's just one line with a TDC scribed in there too.

 

[rbattelle]

This is a great thready by JSteiger on the subject.



-Ryan