B5100E Oil pressure and charging issues

[twostep]

Wow, I completely forgot to follow up to this thread. So I figured that before I tear the engine down I better check it with an actual gauge and sure enough there is no problem with the oil pressure.

Cold 1400rpm: 55psi
Cold 4000rpm: 60psi
Operating Temp 1400rpm: 30psi
Operating Temp 4000rpm: 50psi

The lowest I could get the pressure was at warm idle when I hit the 3pt lift to pick up the 500 pound finish mower... then it only dropped to about 23psi. Service manual says the pressure should be 28 - 64 psi.

I believe that the oil pressure sensor is 1/8" BSPT --- British pipe thread. If you buy that fitting --- should work. The 1/8" NPT fitting that you get with most all oil pressure gauges will also work --- just wrap it well with tread tape but, ---- it will cross thread so I wouldn't plan to go back to the stock fitting.

Here is the option I went with and it has worked awesome. I installed one on my Mitsubishi L3E also.

https://www.mcmaster.com/#4860k141/=15v88w9