Originally Posted by clinebarger
Originally Posted by OVERKILL
My dealer has done a few, though none of the tech's I've spoken to refer to it as "common".
Cue burla, as he's all over this.
Also worth mentioning: They've never done one, or heard of it happening on the SRT 6.4L, despite the lifters being the same part #.....
I'm not sold on it being a lifter problem, The surface hardening or lack-of on the Camshaft is where my theory lies. Every Hemi failure I've seen is on a Cast Iron core (Selectively Austempered Ductile Iron) which is a fancy way of saying Cast Iron with hardened work surfaces.
Pre-MDS 5.7L Hemi's used 5150 Billet lobes & journals pressed onto a hollow tube. I had a isolated incident with with one of these on a Mopar Performance Crate engine......Number 3 cam bearing was installed/clocked incorrectly from the factory, Starving the journal of oil. The cam journal seized to the bearing causing the journal to break loose from the tube.....Not before shearing the cam gear locating dowel causing the cam gear to rotate about 30 degrees out of time.
Mopar warrantied the engine!
I wonder where they are sourcing the cam cores? I was reading an article some time ago about companies (I assumed aftermarket) using cheap SADI cores from third world countries. In the lower production higher performance engine they may be using a higher quality domestically produced core. Just a thought.
Originally Posted by OVERKILL
My dealer has done a few, though none of the tech's I've spoken to refer to it as "common".
Cue burla, as he's all over this.
Also worth mentioning: They've never done one, or heard of it happening on the SRT 6.4L, despite the lifters being the same part #.....
I'm not sold on it being a lifter problem, The surface hardening or lack-of on the Camshaft is where my theory lies. Every Hemi failure I've seen is on a Cast Iron core (Selectively Austempered Ductile Iron) which is a fancy way of saying Cast Iron with hardened work surfaces.
Pre-MDS 5.7L Hemi's used 5150 Billet lobes & journals pressed onto a hollow tube. I had a isolated incident with with one of these on a Mopar Performance Crate engine......Number 3 cam bearing was installed/clocked incorrectly from the factory, Starving the journal of oil. The cam journal seized to the bearing causing the journal to break loose from the tube.....Not before shearing the cam gear locating dowel causing the cam gear to rotate about 30 degrees out of time.
Mopar warrantied the engine!
I wonder where they are sourcing the cam cores? I was reading an article some time ago about companies (I assumed aftermarket) using cheap SADI cores from third world countries. In the lower production higher performance engine they may be using a higher quality domestically produced core. Just a thought.