2015 RAM 2500 6.7L Cummins - Valve Lash Adjustment?
Hello friends!
I have adjusted the valve lash to the factory spec of .010 on the intake and .026 on the exhaust on my 6.7L.
This is a controversial question because I see it all over the internet where people are returning to the original 5.9L specs of .010 intake and .020 exhaust after the parts fall off.
Should I stick with the factory 6.7 spec or move to the older pre-emissions spec?
Most of the arguments I see are that once "certain parts" are no longer present, the exhaust valve doesn't "grow" per se because there is no longer a Regen cycle, and it runs cooler.
My build will only go higher in performance as time goes on.
My argument, I guess, is that even though there is no heat from Regen cycles anymore, wouldn't fueling mods, heavy tuning, and possibly high EGTs from running a truck harder than normal put the truck back into a state to where the factory lash of .026 would still work considerably well in the event of high EGTs from performance mods and running the truck through its paces?
I'm curious to know and am still trying to learn, so any and all knowledge on this subject would be greatly appreciated!
Thank you.
2015 RAM 2500 6.7L Cummins - Valve Lash Adjustment?
After putting studs in, I set mine to the standard settings of .010 and .026.
The truck was quiet and has been running fantastically for the last year.
Mine has undergone significant weight loss.
2015 RAM 2500 6.7L Cummins - Valve Lash Adjustment?
You are overthinking it a little bit.
10 and 26 will be fine.
10 and 20 are quieter and idles a tad smoother.
I set them at 8 and 18 for stock trucks with deletes to trucks over 900hp.
Sent from my iPhone using Tapatalk
1 Attachment(s)
Re: 2015 RAM 2500 6.7L Cummins - Valve Lash Adjustment?
I have noticed that I run mine at the 5.9L specs, and it's considerably quieter at idle.
The 6.7L uses alot of the 5.9L parts; it has a more significant displacement than the 5.9L.
As you can see from the chart below from Fleece Performance, a wide range is acceptable when doing valve lash.
I am sticking with 5.9L specs.
I forgot the percentage of parts carried over from the 5.9L, but it's enormous.
Attachment 15523
Re: 2015 RAM 2500 6.7L Cummins - Valve Lash Adjustment?
How often do you need to adjust the valve lash?
I'm close to 90k now.
Re: 2015 RAM 2500 6.7L Cummins - Valve Lash Adjustment?
Quote:
Originally Posted by
northstarfire0693
How often do you need to adjust the valve lash?
I'm close to 90k now.
Per FCA, valve lash adjustment is required at 150k miles or 120 months.
Re: 2015 RAM 2500 6.7L Cummins - Valve Lash Adjustment?
Quote:
Originally Posted by
AK Bob
Per FCA, valve lash adjustment is required at 150k miles or 120 months.
Not there yet, but where is a good source for me to figure out how to do it?
Re: 2015 RAM 2500 6.7L Cummins - Valve Lash Adjustment?
Quote:
Originally Posted by
northstarfire0693
Not there yet, but where is a good source for me to figure out how to do it?
There are a couple of good videos on YouTube on how to do it.
It's very easy just more time-consuming than anything else.
Here is a guy who is really knowledgeable on YouTube named Dark Iron Diesel, and he explains perfectly how to do it.
https://www.youtube.com/watch?v=BLNu...ature=youtu.be[/URL]
1 Attachment(s)
Re: 2015 RAM 2500 6.7L Cummins - Valve Lash Adjustment?
These will also help you out if you are OCD like me when it comes to getting the right feel of the gauge you use.
I used angled regular ones when I did mine originally.
But another member told me about these, so when I do my head studs, I am going over everything with these.
Attachment 15525
1 Attachment(s)
Re: 2015 RAM 2500 6.7L Cummins - Valve Lash Adjustment?
Quote:
Originally Posted by
northstarfire0693
Not there yet, but where is a good source for me to figure out how to do it?
Quite a few videos on YouTube.
See attached from Mopar Tech Authority for the official information.
