Posted by Jeff NWOH on August 13, 2021 at 05:25:40 from (107.11.13.249):
I have a Jinma 254 tractor here that needs split for an oil leak. When the owner dropped it off, he also told me that the last time he used it he got the oil light after warmed up at idle. He had assumed it was out of oil, but when he checked it to load it and bring it to me that was not the case.
So, before I split it, I put a gauge in the port to verify what was going on. The needle on the gauge flutters very quickly, probably coinciding with engine rpm. Cold idle it swings between 40 and 60 psi. Warm is between 10 and 30. The higher the rpm, the faster the flutter. I assume the drop in overall pressure is most likely general wear, but am a bit lost on what would cause the flutter. It almost seems like an oil port on the crank is exposed for a portion of revolution and just dumping oil, but I'm not sure how that would be possible. I did pull the pressure relief valve and it looks fine.
Any ideas what would cause this? I'd like to have some idea what I'm looking for or if there's anything else I can check/test before I pull the engine. The parts breakdowns are pretty crude drawings, so not much help there.
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