Oil pressure drop, bad case half??????

[surfly]

Upon motoring my new built engine with the starter, no prop, or spark plugs inserted, my oil pressure immediately rose to 80 psi and then dropped to 0 psi while still motoring. Tried three times with the same result. No exterior oil leaks noted.Could this indicate that I have one of those case halves that had bad machine work resulting in open oil pressure galleys. If this is indicative of a bad case half I would like to know now before I proceed any further.
Sherm

[Bryan Cotton]

Bummer Sherm. I am about to start my build and will inspect the case carefully. The SB does list the procedure, and suspected date range.
http://www.aeroconversions.com/support/aerovee_sb.html

For an assembled engine you need to pull a head and one cylinder. Good luck!

[Sonex1517]

Sherm

Just my two cents, but are you sure the oil pump is still primed? I had to prime it again after the first spin to get oil pressure to stay up.

Robbie


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[kmacht]

Are you sure the gage or sensor didn't go bad? I had the oil pressure sensor fail on my aerovee during ground running testing. Check it with a manual gage before tearing the engine enables back down. I also second the suggestion to reprime.

Keith
#554

[wlarson861]

I only use my manual gauge. I'm on my 3rd electronic and they have all been inaccurate. Put in a manual that only cost under $30,be assured you have the right oil pressure