I was able to get an oil pressure gauge and install it temporarily on the
3GM30F. I definitely have oil pressure, but it was interesting to see the
results. I enclosed some vid links in case anyone was interested in
hearing/seeing these results. At 2500 rpm immediately after start up the
pressure bounced between 40-50 psi. https://youtu.be/Ym6CBjTXG0Q.
At 3000 rpms after 15 min run time, the pressure held steady at 62 psi.
https://youtu.be/vy_7_X626Yo
When backing down throttle to ~800 rpm the pressure bounced around at 20 psi.
https://youtu.be/PPxDKUXHUL8
According to the yanmar service manual, pressure at idle should be 7.2 psi and
at 3,500 rpm should be 42-57 psi. Not sure what the results actually mean, but
I at least know there is pressure and have some form of baseline measurements
to assess.
Sean Conner/Ladyhawke
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