Overhauls continued

[ArtVandelay]

If it doesn’t have roller tappets, you could still potentially have DLC coated lifters which are rumored to solve the corrosion problem and cam issues as well as roller tappets.
I’m wondering if the DLC is the standard for overhauls now or if you have to specify and pay a premium for them?

Do they even manufacture non-DLC lifters anymore?

[jaylw314]

6 hours ago, jetdriven said:

Roller tappets have been standard on most factory overhauls since 2005. That’s 15 years and millions of hours of service. 

But has any of that data been put together in any useful way?  I mean, think about it 15 years is only about one typical TBO if you go by years, so that's not actually much to go on, but I don't know anything about how many rebuilds and new motors have been built since 2005.

[jetdriven]

16 hours ago, jaylw314 said:

I assume they are not an overhaul specification, so think it would almost certainly be a premium.

Granted, I also suspect neither the roller tappets or other modified lifters have accumulated sufficient time to build up any usable data on any difference in reliability or maintenance benefit.

In all those 15 years we haven’t read about anyone who had roller lifters that aused an engine tear down and rebuild, but just this board alone has maybe a hundred stories of that with flat lifters.  DLC lifters excluded.  

[Ragsf15e]

9 hours ago, ArtVandelay said:

Do they even manufacture non-DLC lifters anymore?

I guess that’s exactly my question?  If not, it’s definitely worth asking during overhaul.

[jetdriven]

Just now, Ragsf15e said:

I guess that’s exactly my question?  If not, it’s definitely worth asking during overhaul.

Shops often use reground lifters which are cheaper than new.   Then you end up tearing it down for lifter failure 600 hours later and pay for a whole nother rebuild.  

[Ragsf15e]

38 minutes ago, jetdriven said:

Shops often use reground lifters which are cheaper than new.   Then you end up tearing it down for lifter failure 600 hours later and pay for a whole nother rebuild.  

This is good information for those of us going through the overhaul process for the first time!  Thanks!

[Ragsf15e]

3 hours ago, jetdriven said:

Shops often use reground lifters which are cheaper than new.   Then you end up tearing it down for lifter failure 600 hours later and pay for a whole nother rebuild.  

And maybe a new cam too!

[ArtVandelay]

Shops often use reground lifters which are cheaper than new.   Then you end up tearing it down for lifter failure 600 hours later and pay for a whole nother rebuild.  

But if they overhaul to new limits I don’t think they will do that.

[jetdriven]

Reground lifters meet new limits and they certainly do that, they save 100$ in parts and it will last the year warranty. . But I don’t think a reground iron lifter is the same as a new one that’s been nitrided nor a DLC coated  one.