Posted by CenTex Farmall on February 12, 2018 at 10:59:25 from (107.77.173.11):
In Reply to: Re: Zinc Additives posted by Gambles on February 12, 2018 at 07:39:30:
I agree with this post.
Also the older engines have a lot of bearing surface area compared with the loads. On an old tractor you can open the valves with a good shove; only one spring. Try doing that on an LS-7 with triple valve springs. Not hard to see that one generates much much higher loads per square inch on moving parts.
Another thing to keep in mind before freaking about reduced zinc in diesel oils and others is that there is other additive technology being developed and in use. Oil technology is not standing still.
Poor quality parts from overseas vendors are a problem. Even some "name brands" are using overseas vendors for parts. Some of the factories are state of the art and have good QC. Others do not.
A problem I often see is people who "rebuild" engines in a breezy dirt floor shed or people who can't or won't pay attention to properly cleaning out dirty blocks and cleaning new and re-manned parts before they put the thing together. I use a separate parts washing tank to clean new parts out of the box. There's a surprising amount of glitter and debris that accumulates in the bottom. The cleaning solvent runs through a late model fuel filter after it comes out of the pump on its way to the hose.
A friend of mine once had a valve job done by a local shop with a decent reputation that had been in business for a long time. They did the valve job, surfaced, and reassembled the head. Ready to intall.....right? Nope! We ended up tearing it back down and cleaning out an embarrasing amount of grit and dirt from this supposedly ready to go head. That shop has since gone out of business.
I'm not trying to pick on anyone who is doing their best with the facilities that they have; my grandparents certainly had to. But there is a difference.
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