2016 6.2L #7 Intake & Exhaust Valve & Valve Spring Failures

bjewell350 · May 3, 2019

Just broke a #7 intake valve spring in a 2016 6.2L at 30k miles- valve dropped into piston and cylinder wall. New engine is going in next week. In a quick search, I see broken valve springs aren't that uncommon on the 2014-2018 6.2L. A few questions, though:

1) Why is it so common on the #7? Valve springs and valves broken. Somehow AFM related?

2) Have there been updates since 2016 to the valve springs, or to anything that might be contrubuting to this? I'm wondering if I should expect any different results from the replacement engine.

3) What should I look for in the way of additional warranty or anything else for having to deal with being out a truck for a couple weeks, towing fees, and now having an engine replacement black mark on Carfax, etc., potentially impacting resale? Or maybe the majority see a newer engine as a positive thing??

JONBLARC7 · May 3, 2019

I just broke the valve spring on number 5 about a month ago on my 2014 6.2 with 115K miles. I got lucky an only the valve spring broke. It didn't drop a valve so 5.50 for a new spring and TSP spring compression tool I was back on the road. I think you valve springs are the updated ones. My old valve spring had yellow paint on them and the one the dealership sold me a month ago had blue paint on it like your pic.

smythabear · May 3, 2019

OP's intake valve looks pretty damn clean. Jon, did you get a chance to see how your's looked at 115k?

JONBLARC7 · May 3, 2019

No I never removed the heads. BUT about 2 weeks after I fixed the valve spring I pulled out of a parking lot and hammered it. It spun then all hell broke loose. It sounded like a really loud sewing machine and the check engine light started flashing, it also was running ruff. Not as bad as it was when it broke the valve spring (when that happen it sound like it broke a rod).

I was only a mile from our lake place so I decide just to limp it back. Then a quarter mile from my house I heard a pop and then sewing machine sound went away and the truck started run like normal and the check engine light went off. I parked it and checked the codes. I had a stored #7 miss fire which was different the the #5 miss i had when I broke the valve spring. But the truck started and ran fine, not down on power and gas mileage is still pretty good for 33" and 22x12's.

But it has a much louder tick to it than the normal tick these trucks have and what is sound like before.

I'm 90% sure it stuck a lifter for that short time then freed it's self. I pulled the valve cover again to check and all seems fine except that tick.

So after boating season (if i can hold off that long) I'm going to pull the heads and cam my self and do DOD delete with GPI stage1 cam. And get rid of these crappy AMF lifters.

smythabear · May 3, 2019

Interesting. Thank you Jon.

bjewell350 · May 3, 2019

Yeah Jon, that's what I thought I saw somewhere too- that the blue springs are supposed to be the latest and greatest. Maybe they'll have a whole new color for me to try out for them on the new engine. Might have to pull a valve cover when it's done at dealer.