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5w-40 is a good range, looks like from -30 to 122F, cat has a good chart for the temps to run. I end up running 15w-40 in my 3126. I wonder if the HUEI system puts more stain on the oil pump? My oil pressure seems to be around 20-30 at temp at idle, and about 60-70 in cruise. I have the 6pz just...

Give it a search on Google, it is a TM for a yard tractor that has a 3126

If you need any tech data I use TM 9-2320-312-24-2, it has been a good reference. I used it for my overhead valve adjustment and wiring in my cruise control, and diagnosing my fuel feed issue.

Based on your diagnostics you prob think it may be the last 5 bullet points?

Not yet, oil PX is about 60 at cruise and 30 at idle when up to temp. I run 15w-40

Hey my 6pz is the same year as yours just a couple thousand off.

The data plate is good info to determine if the crank was machined down and the bearings are oversized. The problem with oversized is that it removes a possible repair in the future if the crank has to be machined again. Most likely when it was overhauled, the crank was found to have a pit or...