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2015 WK2 3.6 4WD, 116,500 miles, valve train issues

4K views 25 replies 11 participants last post by  akuzin1983  
#1 ·
TL;DR:

Just paid to have the left bank valve train rebuilt for the second time (58k and now 116k) since purchasing this vehicle. Gotta say, I'm not too stoked on buying another Stellantis product.

Full-ish story:

So, I'll keep this to the specific issue of failing hydraulic roller lifters as best as possible. I purchased this vehicle used from a local dealer. Vehicle was sold as CPO with 52k miles and I purchased and extended warranty as well. Front pads and rotors were replaced after test drive showed warped rotors.

A few months after purchase the wife and I took a trip to the Blue Ridge Mountains. While on the trip a sound developed. It was an odd sound, more of a thudding sound, like a snare mute pad. I called my sales person and explained the situation, he said as soon as I get back home to call and get it in and they would check it out. When we returned I called and got it in for service. They plugged it in, brought the service manager out and everyone decided that, although they couldn't hear any sound, that the sound I previously heard was the lifters and that there was a TSB for them and that since it's under warranty they'd just go ahead and do it. They also noted a small amount of rot in a weld on the aluminum hood and that they would have it taken care of too.

After the "repairs" were complete, they called me and advised that the vehicle was ready and that I had a balance of $248. I was surprised and asked what for. I was advised that I had a check engine light on and that the reason was a leaking evap system, so the replaced the evap purge line. Well, two things: the check engine light wasn't on when I dropped it off, and additionally, this should be covered under warranty as was the $5k dollars worth of engine and body work that was just done. He put me on hold and after coming back he said, "we'll go ahead and take care of that for you". Lol, thanks guy, 'preciate it.

Fast forward a few months and, there's the thudding sound again... wth? I recorded it and you could definitely hear it on the recording. Brought it back in, they couldn't hear it. I threw my hands up in frustration, because while I could clearly hear it, from inside and outside the vehicle, they could not. I left, went home, as it was getting late and I didn't have the patience or words to deal with them. The next morning I started the engine and could hear the noise. I pulled the cover off and... the freaking evap purge line was cracked at the purge valve connection point, making the noise. I removed the line and repaired it, reinstalled it and the noise went away.

Fast forward four years and almost exactly double the miles that the valve train was completely redone, now, yes, that sound... THAT sound, that is a failing lifter. Of course I know what that sounds like, anyone who's ever owned an LS powered GM knows that sound. So, I called my shop and asked for a quote to rebuild the left bank. Surprised at the price, I verified with a different dealer what the approximate cost was and they confirmed that it would be around $2400. 🤔 wow.

After a few hours I thought, maybe Stellantis Care would help. I spent some time on chat and the rep advised me to take the vehicle to the dealer, get it diagnosed, and let them know the outcome and cost and that possibly Stellantis Care could help. I brought the vehicle in on Black Friday and within a few hours they confirmed that at least one of the hydraulic roller lifters had collapsed and the left bank would need rebuilt. They sent me the quote and I got back on with Stellantis Care and spoke with another individual about the issue. I advised during the second conversation that this is not normal. This type of repair shouldn't have to be done so frequently and that these are not typical maintenance items. I also advised that the front pads and rotors were replaced at 52k miles when the vehicle was purchased and that the dealer advised that the pads still have 40% life left. Let that sink in... this heavy highway driven vehicle's front pads have lasted longer than the previous lifter and cam job... I was advised during the second chat and during a follow-up phone call a few hours later that a specialist would look into this and that I would be sent an email asking for receipts and the final repair order. Four days have passed, and no email or return contact. I contacted Stellantis Care tonight and I was assured that someone was working on my case and that someone would reach out to me.

I have been reading stories for all variations and years of the Pentastar engine series. It seems that this is a common issue which has led to class action lawsuits, of which the 1st gen recieved an extended warranty to 250k miles. Current gen shows a ridiculous amount of complaints for this very issue, specifically with the left bank, along with a few class action suits in progress.

This vehicle's mileage is about 85/15 highway/city. Oil changes are done ahead of schedule using only the recommended 5w20 in either Mobil1 or Royal Purple. It is very well cared for, and honestly, this issue aside, has been my favorite vehicle to date. After this, I'm positive I will never buy another Stellantis product again. I'm glad this happened when it did though, I was a few months away from trading in one of my other vehicles for a new 2023 JGC Summit, which as previously noted, will not happen.

Thanks for reading. Any input or advice us welcome. This story will be cross-posted on various sites and social media platforms over the next few days.
 
#2 ·
They built millions of these engines. Any low probability failure will seem common.

You can thank the EPA for forcing aggressive lift cams and roller lifters/rockers. These type cams have been eating roller lifters for decades in the race world, now in the transportation appliance world. All manufactures that use roller lifters have the same issue, statistically the FCA V6 is better than most. Cheby has a huge problem with their V8s.

You may ask how to prevent failure, you can't other than being lucky. Unless you suspect poor workmanship at the dealer, you have been very unlucky.

There are several V6s in the 250,000 mile plus club list in the high mileage thread.... High Mileage Owners, Report Your Miles here

You may want to revisit your unrealistic expectations.

.
 
#5 ·
IMHO, it s a low percentage manufacturing defect that causes the rollers to fail over time, regardless of use. I suspect high RPMs hasten the fault occurrence, however. If you were unlucky enough to buy an engine with a defect, the bad lifter is going to fail at some point. If lucky, you will not see a failure until the engine is worn out otherwise. Note that the V8 engine, with 32 lifters, fail more often than the V6 with its 12.
 
#6 ·
so what you are saying is its the luck of the draw.

so is there any after market replacement that does have any chance of surviving

or do you consider the rockers a service item, maybe every 100000 miles??

just swap them out
 
#7 ·
If you drive responsibly and follow the manufacture's service interval:

1) Yes, just like a bunch of other possible mechanical failures

2) No, all have a low failure rate.

3) How do you know you are not replacing good ones with bad ones, and whats the risk of damage to other components by servicing them? Several folks here have reported a bit over 50,000 mile failures, so wouldn't it be closer to a 50,000 mile service interval?

I suppose you could apply some chaos theory and come up with an optimum number, but regardless there is some luck involved. :)

BTW, lifters and cams are high wear parts now days, they will often wear out before the engine starts burning oil.
 
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#10 ·
BTW, lifters and cams are high wear parts now days, they will often wear out before the engine starts burning oil.
I haven't had this experience with any other vehicle I own, and there are 4 others in my driveway. The closest I have come is my 6.0 LS powered TBSS, which had hydraulic roller failures at around 70k. One could argue that it's 700hp is to blame though.
 
#14 ·
James, was the 58K left bank rebuild due to rockers, or was it the dreaded cylinder 2 failure that was a problem with the early production Pentastar engines? I am thinking this could be two different issues. The first should have been covered by warranty/recall. The rockers will not be unless you have a Max Care warranty. If the cams are still good you can replace the rockers without removing the cams. If the cams are torn up it's a much bigger job. if it's bad you need to look at your options, you may find it cheaper to buy a remanufactured cylinder head than pay for the individual parts and associated labor. You also need to consider dropping the oil pan and giving it a good clean because all that metal from the cams and rockers is likely to be circulating with the oil. Some mechanics install a magnetic drain plug to try and capture any metal fragments and perform a few oil changes every 500 miles until there are no fragments on the mag plug.
 
#20 · (Edited)
Are you sure it's not the rocker arm needle bearing issue? The Pentastar is a OHC engine and as such does not have hydraulic roller lifters like Hemi V8s and Chevy V8s both of which have a single cam in the block, and lifters and pushrods to actuate the valves. The Pentastar has 2 overhead cams on each side with roller rocker arms and hydraulic lash adjusters. The more common failure is the roller bearings on the rocker arms. This if left too long can also damage the cams, which might be why you had a repeated failure, if the first repair didn't include updated parts. Supposedly the rocker arms after '16 have improved roller bearings.
Try posting this up over at:
www.allpar.com
there are a couple of people who are familiar with this failure and the right way to repair.
 
#21 ·
Are you sure it's not the rocker arm needle bearing issue? The Pentastar is a OHC engine and as such does not have hydraulic roller lifters like Hemi V8s and Chevy V8s both of which have a single cam in the block, and lifters and pushrods to actuate the valve. The Pentastar has 2 overhead cams on each side with roller rocker arms and hydraulic lash adjusters. The more common failure is the roller bearings on the rocker arms. This if left too long can also damage the cams, which might be why you had a repeated failure, if the first repair didn't include updated parts. Supposedly the rocker arms after '16 have improved roller bearings.
Try posting this up over at:
www.allpar.com
there are a couple of people who are familiar with this failure and the right way to repair.
Are you sure it's not the rocker arm needle bearing issue? The Pentastar is a OHC engine and as such does not have hydraulic roller lifters like Hemi V8s and Chevy V8s both of which have a single cam in the block, and lifters and pushrods to actuate the valve. The Pentastar has 2 overhead cams on each side with roller rocker arms and hydraulic lash adjusters. The more common failure is the roller bearings on the rocker arms. This if left too long can also damage the cams, which might be why you had a repeated failure, if the first repair didn't include updated parts. Supposedly the rocker arms after '16 have improved roller bearings.
Try posting this up over at:
www.allpar.com
there are a couple of people who are familiar with this failure and the right way to repair.
 
#23 ·
The problem with dying rockers in my opinion is rooted in several things:
1) incorrect oil change interval. The oil change interval should be strictly based on the condition of the oil. Not the slightest hint of oil coking is allowed. The change interval is cut in half as soon as you go off-road. Pentastar is very sensitive to oil. Change the oil less than 5000 miles, if you go off-road, then more often. This is the reality and peculiarity of this engine.
2) incorrectly selected oil. Oil with Chrysler approval is required. The viscosity of the oil should be exactly the same as on the oil filler cap. The peculiarities of rocker lubrication do not tolerate the wrong oil
3) weak lubrication system. Chrysler came up with a very fragile cylinder head lubrication system. Rockers and cams are lubricated by a jet under pressure. Oil from the oil gallery goes to the hydraulic compensator and to the rocker arm part, then through the oil nozzle the stream tries to get to the cam and the rocker arm. This fragile system has weak points:
a) loose oil gallery bolts do not provide the required pressure and the stream does not reach the lubrication point
b) the hydraulic compensator (lifter) valve does not work. The oil pressure is enough to fill the lifter, but it is not enough for the rocker nozzle to do its job and the oil does not get to the camshaft.
c) the connection of the lifter head and the rocker is not tight. there is oil loss between the lifter head and the rocker part and the stream is not formed from the rocker nozzle, the camshaft runs dry.
All these reasons are related to the cleanliness of the engine, the quality of the oil and its condition at the time of engine operation. If there is even the slightest suspicion that there is dirt and debris in the engine, you must immediately flush the oil system very thoroughly. The channels in the lifters and the rocker nozzle have very small holes. If there is even the slightest deposit of burnt oil, everything must be disassembled and washed. If there are darkened areas on the metal of the cylinder head, everything must be disassembled, washed and the lifters MUST be changed (ALL!!!). If you hear even the slightest deviation from the normal purring of the engine in your engine, replace all the lifters. The engine is very capricious about the quality of the oil. Good luck to everyone
Sorry for my English
 
#24 ·
That may help keep a defective roller bearing spinning a bit longer, but 99.99% of these issues start out as bad bearings. World wide EPA type standards forces manufactures to choose between low stress engines that run like dogs (e.g. most Toyotas), or higher stress engines that have some pep. The high stress engines have sharp cam profiles that create higher valve train stresses than the performance cams of years ago.

These are low rate failures and statistically you can easily run 1000s of cars into the ground before you have a roller bearing fail.

Manufactures can choose to spend a lot of money on quality control and pass it on to the customers, or take some chances. Manufactures make different compromises.

The roller bearing story hasn't changed much over the years. There have been a couple well know aftermarket cam suppliers surprised by a bad batch of vendor supplied roller bearings, and brought the manufacture back in house to better control quality.
 
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#25 ·
Agreed. While short oil change intervals and the best oils can help, nothing fixes a bad part other than replacing it.