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MDS roller lifter failure update!!! #3080051
09/23/22 03:45 PM
09/23/22 03:45 PM
Joined: Jan 2005
Posts: 11,745
Kalispell Mt.
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HotRodDave Offline OP
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HotRodDave  Offline OP
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Kalispell Mt.
This is just for yall's information from my personal experience since I have mentioned before I have never seen a bad roller on an MDS lifter and never seen a bad one in a 6.4. I have replaced a mountain of cams in these hemis from 09-14 model years.


I just found my first MDS lifter roller failure and resulting destroyed cam, it is in a 2014 6.4 I bought. I have done tons of cam lifter replacements in 5.7s from 09 - 13 This is the ONLY roller and cam failure I have seen in a 6.4, it is the latest model year roller failure I have seen. It is the early small needle roller just like all the other failed roller I have seen (since I noticed the difference). My personal 6.4 I put in my 2011 came with the larger needles from a 2014 that the truck burned to the ground and did not have a failed roller. Oddly enough this is also the only truck engine I have seen built in the SRT block and everything has 2013 casting dates so my guess is they started "BGE" production for 2014 MY before they had enough BGE blocks. This gives me confidence the change over to the bigger needle bearings and the end of mass roller lifter failure as the middle or early 2014 MY production. I have replaced a couple of lifters in later year engines because they did not pump up but this is the latest roller and subsequent cam failure I have seen. All other lifters I have seen eat a cam were a failed roller on NON MDS cylinders. The cylinders and bearings in this engine look like new, very well cared for engine..


I am not causing global warming, I am just trying to hold off a impending Ice Age!



Re: MDS roller lifter failure update!!! [Re: HotRodDave] #3080231
09/24/22 10:21 AM
09/24/22 10:21 AM
Joined: Jan 2011
Posts: 12,440
Central Florida
larrymopar360 Offline
I'm tired...Very tired.
larrymopar360  Offline
I'm tired...Very tired.

Joined: Jan 2011
Posts: 12,440
Central Florida
Thank you Dave for the information. I'm always interested in what you have for us, knowing how many of these engines you have torn apart up


Facts are stubborn things.
Re: MDS roller lifter failure update!!! [Re: larrymopar360] #3096536
11/23/22 11:31 AM
11/23/22 11:31 AM
Joined: Apr 2007
Posts: 2,824
Calgary, Alberta Canada
a12rag Offline
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a12rag  Offline
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Joined: Apr 2007
Posts: 2,824
Calgary, Alberta Canada
When you have found this issue in 5.7 with MDS, have you only replaced the cam & lifters ??? Or did you totally go through the engine ?

Re: MDS roller lifter failure update!!! [Re: a12rag] #3096574
11/23/22 01:39 PM
11/23/22 01:39 PM
Joined: Jan 2005
Posts: 11,745
Kalispell Mt.
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HotRodDave Offline OP
I Live Here
HotRodDave  Offline OP
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Joined: Jan 2005
Posts: 11,745
Kalispell Mt.
I have never seen an MDS lifter in a 5.7 go bad, only the NON mds lifter... since the 6.4 and 5.7 use the same lifters I would say it is possible but very unlikely as the non mds lifters usually go bad first. As for your question I have torn a couple engines apart after lifter failure and there is never any bearing damage so now I just put a cam in, dump a couple gallons of diesel fuel thru it with the oil drain plug removed to try and clean out the pan a little and send em.


I am not causing global warming, I am just trying to hold off a impending Ice Age!



Re: MDS roller lifter failure update!!! [Re: HotRodDave] #3096668
11/23/22 09:27 PM
11/23/22 09:27 PM
Joined: Jan 2003
Posts: 5,592
Hot Rod Ridge
FastmOp Offline
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FastmOp  Offline
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Joined: Jan 2003
Posts: 5,592
Hot Rod Ridge
What about a 6.1 lifter ? How they hold up

Re: MDS roller lifter failure update!!! [Re: FastmOp] #3097091
11/25/22 04:17 PM
11/25/22 04:17 PM
Joined: Jan 2005
Posts: 11,745
Kalispell Mt.
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HotRodDave Offline OP
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HotRodDave  Offline OP
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Joined: Jan 2005
Posts: 11,745
Kalispell Mt.
I have never personally seen a 6.1 lifter take a dump.


I am not causing global warming, I am just trying to hold off a impending Ice Age!









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