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Help with oil leak from behind E225-8 data plate

I have an annoyingly excessive oil leak coming from what appears to be beneath my engine data plate. Then engine has about 650 hours on it and it appears to have oversized data plate screws. My biggest fear would be a crack beneath the plate but it seems unlikely. Does anyone know how deep those data plate screw holes are intended to be drilled into the case. Before I pull the plate, I thought I would gather some information from you all. I bet the engine was overhauled the case was drilled through all the way and one of the data plates attaching screws is not making a oil tight seal. If this is the case what would be your recommended solution? Any help is greatly appreciated. Please see below for link to the video.

https://photos.app.goo.gl/DDadsZuGkrtvKDs79

Model: Bonanza D35
Posted 11/9/2023 - 3 months ago
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A well trained E-series will always mark its spot...

I don't see it accumulating from above, so the source must be under. Those are drive screws, page 2 of the attached Continental document discusses installation and removal of the data plate.

Mike
ABS Technical Advisor

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SIL00-9A data plates.pdf - 176.3 KB

Posted 11/9/2023 - 3 months ago
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659 hours is very low time for an engine that was last built in the 1960’s. I wonder if someone replaced that data plate and drilled through the crankcase. As previously mentioned, these should be drive screws. Not slotted or phillips. Not sure about other FAA offices, but the Atlanta FSDO has told me they like to be present when an aircraft or engine data plate is replaced.

Posted 11/9/2023 - 3 months ago
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Michael Thanks for the SIL that has become extremely valuable. Thanks for the help guys!

Posted 11/13/2023 - 3 months ago
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If the screws are removable I would remove them one at a time and probe the hole with some wire to see if the hole goes through the case into the crankcase interior. If so, put some Permatex gasket sealer on the screw threads and replace the screw. Then do the other three screws using that process. The Permatex will stop the oil leak. Having the fastener hole go through into the crankcase interior should not be any problem for the engine except for the oil leak.

Regards, Lew Gage

Posted 1/2/2024 - 1 month ago
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Help with oil leak from behind E225-8 data plate