Valve lash adjustment
08-16-2010, 06:28 PM
#1
Registered User
Thread Starter
Valve lash adjustment
Hay Boys
I'm getting ready to adjust the valves on my truck. Searching through the threads I see people rotate the engine backwards with the alternator, I have no barring tool so this would be my method also. For reassurance My question is do you still adjust the valves in the same order. I.E. intake and exhaust.
Thanks is advance
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 0.660 mm (0.026 in.) Tighten the lock
nut to 24 N·m (18 ft. lbs.) and recheck 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.
8. Install the cylinder head cover (Refer to 9 - ENGINE/CYLINDER HEAD/CYLINDER HEAD COVER(S) - INSTALLATION).
9. Connect the battery negative cables.
I'm getting ready to adjust the valves on my truck. Searching through the threads I see people rotate the engine backwards with the alternator, I have no barring tool so this would be my method also. For reassurance My question is do you still adjust the valves in the same order. I.E. intake and exhaust.
Thanks is advance
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 0.660 mm (0.026 in.) Tighten the lock
nut to 24 N·m (18 ft. lbs.) and recheck 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.
8. Install the cylinder head cover (Refer to 9 - ENGINE/CYLINDER HEAD/CYLINDER HEAD COVER(S) - INSTALLATION).
9. Connect the battery negative cables.
08-16-2010, 10:09 PM
#2
Registered User
I have it written down in the garage but that sounds right. Adjust them so there is only slight drag on the feeler gauge. These are wimpy valve springs and hard drag on the gauge will be pushing the valve open. Craig
08-16-2010, 10:29 PM
#3
Registered User
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.
(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 (Fig. 32). 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:
˛ 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.
(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.
(8) Install the cylinder head cover (Refer to 9 -
ENGINE/CYLINDER HEAD/CYLINDER HEAD
COVER(S) - INSTALLATION).
(9) Connect the battery negative cables.
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.
(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 (Fig. 32). 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:
˛ 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.
(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.
(8) Install the cylinder head cover (Refer to 9 -
ENGINE/CYLINDER HEAD/CYLINDER HEAD
COVER(S) - INSTALLATION).
(9) Connect the battery negative cables.
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spoolinup (11-23-2021)
08-18-2010, 09:57 PM
#6
Registered User
I did mine at about 30k and most of them weren't much more than .001 loose. One might have been close to .002. I was hardly worth the time and it made it quieter but the comfort of knowing was worth it. Craig
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08-19-2010, 11:46 AM
#8
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loose lifters
Quicksilver, I had a ticking at about 50k and took it to 2 different Dodge service managers--both said its normal and just drive and dont worry. I know my trucks sound and wasnt satisfied. Took it to a local repair shop and they said the valve clearance should be checked. Results----most rocker arm bolts were loose and a couple were out 3+ turns. Back to the dealer and same service manager said I screwed up by taking it to an independent garage and keep my mouth shut to protect my warr. Now I was ticked. Not only would Dodge not pay for the adj., they said I did the wrong thing. My faith in Dodge and cummins has been severely impaired. Just my experience..... 04 2500 qcab--85k, love it but its just not as dependable as my toyotas..
08-20-2010, 07:09 AM
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Hey guys i'm interested in doing now after reading this thread. i got 25K on mine and i like to do this just to have that piece of mind. My question is my dad is a race engine builder and he has prob adjusted thousands of valves on gas engines. is this process the same with diesel engines and would he use the same tools? I ask cuz he has never touched a diesel engine and doesnt want hurt anything.
08-20-2010, 12:38 PM
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08-20-2010, 01:06 PM
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07BigHorn, yes it is dirt simple and same type of tappet adjustment as on a gasser. I wouldn't even bother doing it at 25K though. I did mine for the first time at 100K and they were all in spec. I adjusted a few anyway just to be **** and get them all even (hey if you already have the valve cover off its a disappointment to put it back together without adjusting a single valve right? you feel like you just HAVE TO adjust something before buttoning it back up! 
). Dodge doesn't even call for the first valve adjustment until 150K miles.
). Dodge doesn't even call for the first valve adjustment until 150K miles.
08-20-2010, 01:17 PM
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The reason why i'm curious about this is because after reading this thread i got in the truck and drove home from work. On the way think my ears started to get **** and started hearing a tick that seemed random and not insync with the engine. i dont know if it was just the echo of the engine off of something or a out of spec valve. thank you the info tho sdaly.