Valve lash adjustment

**Polaraco** · 11-06-2014

Originally Posted by 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.)

Same spec

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**ywgbandit** · 11-06-2014

Not quite .060 - .021 on the 6.7 and .060 - .015 on the 5.9 for the intake
.015 - .034 on the 6.7 and .015 - .030 on the 5.9 for the exhaust.

I think they run the 5.9 tighter because it runs cooler, the 6.7 with all the crap removed should also run cooler....do you agree?
I was thinking .012 intake and maybe .025 exhaust....or do you think that's too wide when running full delete?
I am running an economy tune in my RaceMe for now, but will run the tow tune with my 6500# trailer.
I appreciate your opinion as you have been doing this much longer than I have.....my background is in helicopters not diesels.

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**Polaraco** · 11-07-2014

Originally Posted by ywgbandit

Not quite .060 - .021 on the 6.7 and .060 - .015 on the 5.9 for the intake
.015 - .034 on the 6.7 and .015 - .030 on the 5.9 for the exhaust.

I think they run the 5.9 tighter because it runs cooler, the 6.7 with all the crap removed should also run cooler....do you agree?
YES IT WILL

I was thinking .012 intake and maybe .025 exhaust....or do you think that's too wide when running full delete?
THE MAX SPECS ARE THE SAME. JUST ADD A COUPLE OF THOU ON EACH. LEAVING THEM A TAD LOSE WILL HELP FUEL ECONOMY.

I am running an economy tune in my RaceMe for now, but will run the tow tune with my 6500# trailer.
DON'T KNOW THE RACEME SO YOU'LL HAVE TO PUNT

I appreciate your opinion as you have been doing this much longer than I have.....my background is in helicopters not diesels.
THAT EXPLAINS WHEY WE'RE GOING ROUND AND ROUND WITH THIS. I'M A FIXED WING GUY.
DID YOU KNOW CONTINENTAL HAS A DIESEL AIRCRAFT ENGINE? JUST SAYING.

DID YOU KNOW CONTINENTAL HAS A DIESEL AIRCRAFT ENGINE? JUST SAYING.

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**DRD** · 11-07-2014

Most folks will say that Cummins says .010 intake and .026 exhaust valve lash on a 6.7. That will work fine. However some folks go by the 5.9 said specs of .010 intake and .020 exhaust lash. I use the 5.9 spec on deleted 6.7s. It usually will be a tad quieter when the engine is cold. It does seem logical for a deleted 6.7 to use a tighter spec on the exhaust side since the heat generating Regen cycle is no longer present.
Going back to the tapping noise on some newer trucks...some folks say the CP3 will tick ever so slightly due to its own harmonics in relation to the gear drive on the front of the engine.

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**ywgbandit** · 11-07-2014

Originally Posted by Double R Diesel

Most folks will say that Cummins says .010 intake and .026 exhaust valve lash on a 6.7. That will work fine. However some folks go by the 5.9 said specs of .010 intake and .020 exhaust lash. I use the 5.9 spec on deleted 6.7s. It usually will be a tad quieter when the engine is cold. It does seem logical for a deleted 6.7 to use a tighter spec on the exhaust side since the heat generating Regen cycle is no longer present.
Going back to the tapping noise on some newer trucks...some folks say the CP3 will tick ever so slightly due to its own harmonics in relation to the gear drive on the front of the engine.

You'll have to excuse my ignorance, but what is a CP3? This may be what I'm hearing.

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**ywgbandit** · 11-07-2014

Originally Posted by Polaraco

DID YOU KNOW CONTINENTAL HAS A DIESEL AIRCRAFT ENGINE? JUST SAYING.

Yes there have been a number of diesel engines over the years. I worked on turbines myself, a slightly different animal.

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**DRD** · 11-07-2014

Originally Posted by ywgbandit

You'll have to excuse my ignorance, but what is a CP3? This may be what I'm hearing.

The CP3 is the high pressure fuel pump on the driver's side front of your engine. It is the heart of our 6.7 engine's fuel injection system.

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**ywgbandit** · 11-07-2014

So this can make a noise that sounds similar to an out of adjustment tappet? Is it anything to worry about, or is it normal? And thanks for the help bye way.....it's appreciated?

I think I will still do a valve lash adjustment because of the engine being deleted and I will probably do .010" and .022", that should be safe and a little quieter than it is now.
Any comments or observations?

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**Wildkarrd RRD** · 11-07-2014

I'm running 5.9 spec on my deleted 09. And have that CP3 tick. Easy way to tell is just to listen. If it's valves it'll be same sound up by drivers door walking around the front to passenger door. With CP3 it's loudest next to it up by drivers headlight. Mine can only really be heard right there.
And it is normal some are just louder than others. Mine was a lot quieter until I opened up the valves inside.

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**ywgbandit** · 11-07-2014

Then I'm pretty sure it's the CP3, but I'm going get the stethoscope out and locate the exact source. I'm still going to do the valve lash, just for peace of mind.

Thanks to all for the good information, this is a great forum with lots of experience!!

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