What year, engine, application is this? Ive seen the same rockers from the 24v 5.9 to the QSL9.

The slight adjustment on the rockers is in no way enough for valve interference. As you torque down the bolt it will actuate the spring. Making some more effort to bolt down then others.

There is no TDC1 and 2, if looking at the view from timing cover. Its marked as TDC and BDC. If the line is at tdc, then its tdc1 compression. Regardless, again just bolt them down, rotate engine full 360, check torque and valve lash.

I-6 is really easy once done a couple times, but doesnt hurt to rotate over once or twice and check work.

 

2013 6.7 cummins 3500 pickup

i have the engine at TDC right now but have not installed rockers yet, was just wondering if there is anything i should be on the look out for before i learn the hard way.
have only set lash once before but never had rockers out of anything so wasnt sure if i should be concerned about anything.
so i shouldnt have to be concerned about the piston hitting any valves?

 

So, even in interference. Like a new big cam install that might be out of time, would need probably 1/2” breaker bar to bend valve when static.

YOU WOULD KNOW

Contact would be heard, base of rocker wouldnt be touching, and be adding 100+ft lbs torque to continue to try tighten.

better practice is lining up the oil holes pedestals where they live, can add some assembly lube on tips but, totally not necessary unless new build.

Id think greatest danger is a pushrod went out of tappet. Pull up and down slightly and feel for its resistance before seating it in and tightening.

 

Heres the mopar1973man valve lash article. Again, unless the pushrods are out of place, I dont see much to this. The older trunions were known for galling issues, but the 6.7s had the new style rocker.

Valve Lash Adjustment

Valve Lash Adjustment For Cummins Valve lash adjustment is suggested to be done at 150K miles which I think is too far down the road. My valve lash were out of adjustment a bit at 92K miles. So this is how I did my valve lash adjustment on my truck. Valve lash adjustment is fairly simple to do an...

mopar1973man.com

 

yeah before i left off i checked my push rods i can feel when it pops out of the tappet i made sure all push rods are seated properly but was unsure if there was any thing else i should be looking out for

 

Should be golden! Send it!

if super anal, can inspect pushrods etc for wear and cracks, bends whatnot. Unlikely to have damaged valvetrain without symptoms, but cant hurt to inspect for practice.

 

i pulled the push rods already and looked over all the valve springs already while i was there figured wouldn't hurt to look. also do you know if these 6.7 have an alignment mark to line up the TDC mark on the dampener or do you just eye ball it and get as close to 12 o'clock?

 

Dampner, no. Can paint/mark one on. Timing case is the official mark.

 

I think Svalin mistyped because there are 2 TDC's in a 4 stroke engine!

TDC on compression stroke and TDC on exhaust stroke.

 

@StealthDiesel for sure. And 2 BDCs. But sounds like the OP hasnt done this too many times, dont want confusion.

Ill help clarify that. When the injector timing mark is straight up lined with TDC that is TDC compression #1.

When you rotate the CRANK shaft 360 degrees, the injector timing mark will be 180 degrees straight down( cam and injector gears 2x as big so complete revolutions half as many as crank). In the BOOK its referred to as BDC. Its actually TDC 6 compression and TDC 1 exhaust.

 

I think I understand the confusion.

There is no injector timing mark on a common rail Cummins engine. There is only a single TDC mark on the harmonic damper.

To determine TDC on the compression stroke on the CR Cummins, you have to watch the valvetrain.

 

?? Really? Its been a bit since ive done a QSB6.7. The intervals are much less or none on some of new engines. I could swear it does have a cover and a mark. I just did a QSL9 that is common rail and for sure had the cover and timing marks.

 

If watching the valvetrain do the companion cylinder over lap method.

When #6 both rockers move, one up one down, thats overlap. The cam on the companion cylinder (#1) will be 180 off the lobes. So adjust 1.

To find companion, divide fireing order in half
153
624

 

For the EFI Common rail 5.9L and 6.7L Cummins in the Dodge/RAM trucks, the ECM controls the injectors using the external crank sensor and the internal camshaft sensor.
There are no external injector timing marks, only a TDC indicator on the harmonic damper.
I'm not familiar with industrial CR Cummins engines or the VP44 trucks..



Back to the OP's questions:

Here are the Fleece Performance CR Valve lash procedures. It's identical to the Cummins service manual.


VALVE LASH PROCEDURE:

NOTE: To obtain accurate readings, valve lash measurement and adjustments should only be performed when the engine
coolant temperature is less than 60 degrees C (140 degrees F).

STEP 1: Disconnect negative battery cables

STEP 2: Remove cylinder head cover.

STEP 3: Using the crank shaft bearing tool [Fleece P/N FPE-CCBT), rotate crankshaft to align damper TDC mark to 12:00o’clock position.
a. If both number 1 cylinder rocker levers are loose, continue to next step.
b. If both number one rocker levers are not loose, rotate crankshaft 360 degrees.

STEP 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 is
required.
VALVE LASH LIMIT CHART
INTAKE EXHAUST
MINIMUM 0.152 mm (0.006 in.) 0.381 mm (0.015 in.)
MAXIMUM 0.381 mm (0.015 in.) 0.762 mm (0.030 in.)
NOTE: If measured valve lash falls within these specifications, no adjustment is necessary. Engine operation within these
ranges has no adverse effect on performance, emissions, fuel economy or level of engine noise.

STEP 5: If adjustment is required, loosen the lock nut on the 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 N.m (212 in-lbs) and recheck the valve lash.

STEP 6: Using the crankshaft barring tool, rotate the crankshaft one revolution to align the damper TDC mark to the
12:00 o’clock position.

STEP 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.

STEP 8: Install the cylinder head cover.

STEP 9: Connect the negative battery cables.

 

@StealthDiesel Thanks for chiming in, I get lost in the different engines sometimes. Want to make sure the most accurate info is posted. I did not check quickserve between the different 6.7s.

The valve overlap method is very effective if understood and utilized properly. If have a strong understanding how 4 strokes work can build on that foundation and work on most anything.