Valve lash adjustment

[ywgbandit]

Just got a new to me Ram 3500, 6.7 and the truck only has 13K miles on it. I have a moderately loud noise in my engine, that I'm pretty sure is a tappet noise, (it's not a rod or bearing knock) and I figure it has been out of spec since new but I have done a full EGT & DPF delete and don't want to go to the "Stealer". I also am really enjoying the fact that I can actually work on this engine as opposed to the 6.0 Ford Power Stroke I had. I'd rather do it myself and know it was done right! Can anyone give me advice as to any potential issues or preparation for adjusting the valve lash? Will I need a new valve cover gasket? Will I be able to turn the engine with a bar on the crank end? Comments & observations are appreciated.

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[Polaraco]

Didn't you ask us this already? There's a thread running with all kinds of answers

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[ywgbandit]

Yes I asked about this in the wrong section, just thought I'd ask in the correct section and get more information. I have decided to do a valve adjustment and wanted to know more about the procedure itself, never having done one on this engine. Will I need to purchase a valve cover gasket in advance, or does this engine use an "O" ring type rubber gasket? I read that most are adjusting the intake to .010" and exhaust to .020" when cold, but the post wasn't specific to the 2012, 6.7, so is this accurate?

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[Polaraco]

Instead of hashing this again, go look at the other thread. We answered the questions.

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[ywgbandit]

My apologies. I just re-read that post and nobody mentioned if the gaskets are a permanent O-ring type or if they are a one use type. I don't want to get started and find out I need to drive 75 miles to the dealer to buy gaskets. Just trying to be prepared. Again...I apologize the the duplication.

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[Polaraco]

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
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.
(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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[Polaraco]

Now that said, the valve lash shown is for a 5.9. But guys say they use them on 6.7's.

Yes the gasket is integral with the injector wires and is reusable.

We asked you if you had a warranty on the truck and suggested a trip to the dealer. Now it soumds like you are way out there and a run for a gal of milk is a safari. I got it now.

Adjustments are made cold

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[ywgbandit]

That is the exact information I was looking for...thank you kindly. And yep, I'm in the middle of nowhere as far as a Dodge dealer goes, and the closest one does not have a good reputation.

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[Polaraco]

That is the exact information I was looking for...thank you kindly. And yep, I'm in the middle of nowhere as far as a Dodge dealer goes, and the closest one does not have a good reputation.

You're Velcom.

You'll have to get the correct valve specs though. The 6.7 is bigger. The procedure is the same

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[ywgbandit]

These are the specs I found online, I thought I would adjust to average of the spec, except that with out the erg and erg cooler I may be safe going tighter on the exhaust...what do you think?
VALVE LASH LIMIT CHART
INTAKE
0.152 mm ( 0.006 in.) MIN.
0.533 mm (0.021 in.) MIN. (13.5 Avg.)
EXHAUST
0.381 mm (0.015 in.) MAX.
0.863 mm (0.034 in.) MAX. (24.5 Avg.)

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