WWDiesel wrote:
This is the engine oil flow path.
Thanks WWDiesel, for sharing this oil flow diagram on June 14, 2021. I edited it a bit for a better view of the Hydraulic Lash Adjusters lubrication path.
The lash adjusters are at the end of two oil circuits so the only way for debris to exit is through the lash adjusters with their tiny ports. In examining my lash adjusters (some people call them lifters, but they're not), I have found several of them clogged. Most of them had some "spring" in them such that I could push-down on the tops and the unit would compress a little. The ones marked with big red arrows would not compress. This would explain the clacking noise my engine has been making.
This is a lash adjuster in it's normal state with spring tension pushing the rocker arm upward.
This is the same lash adjuster with a couple pounds pressure pushing downward. The spring compresses. Some of the lash adjusters would not push down. Engine oil pressure pushes the lash adjuster upward to someplace between fully extended and fully compressed.
These adjusters have very small ports for oil to come in and out, about 1/32" each. So they collected bits of carbon that I "cleaned" when I overhauled my engine. Clearly I didn't clean the oil galleys enough.
Here is yet another example of 'no one else to blame but myself'. The lesson here is to have the block professionally boiled to avoid situations like this.
I do have a full set of brand new hydraulic lash adjusters that I'll be putting in. They are soaking in some light engine oil to assure they are already full of oil. This is feeling like it will be a good fix.
Dean.
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