I am having the same problem on my 2100D. I've had fluctuations on my Oil Pressure EMS indicator from a normal (temp) oil pressure of 30PSI dropping down to 12PSI which sets off bitching Betty. I connected a mechanical pressure gauge on a tee where the oil line comes off the engine, one branch of the tee goes to the VDO sending unit mounted on the firewall (braided SS line) and the gauge is mounted on the engine coming off of the engine case. This is only for testing purposes with the top cowling off.. The mechanical gauge has recorded pressures as high as 45-50 when the engine is cold and 23-30 when engine is at normal temperature (approx. 140deg F). On the contrary, I have recorded pressures as low as 12 PSI on the EMS during the same test. I have replaced my oil pressure sending unit three time. My latest one is a VDO unit. The other two previous units were bought on the internet from China. My oil line is a SS braided flex line from the engine to a header on the fire wall which connects to a test port for a mechanical gauge and a secondary port for my sending unit. I was wondering if the line has an air pocket in it that acts like a hydraulic hammer and causes the fluctuations. My second thought was to rebuild the oil pump. Sorry that at this time I have no solution, but I am working on the problem. Luis
Sent from Yahoo Mail for iPhone On Sunday, September 8, 2024, 4:25 PM, Larry Flesner via KRnet <krnet@list.krnet.org> wrote: On 9/8/2024 10:50 AM, K W via KRnet wrote: > Hello to everyone. > I have a very erratic oil pressure gauge reading in the cockpit. > Installed a connector T at the oil pressure port on my 2100 D and > attached a direct reading gauge for verification. Direct reading gauge > is very steady oil pressure while cockpit > instrumentation is sporadic fluctuating from 0 to 40. my question, > assuming I need to replace the sending unit, does a sending unit have > to match the happi gauge or can I buy an off the shelf sending unit? > > Cheers TIA > Keith > +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Keith, Not seeing a response I'll throw in my non-mechanic opinion. Buy an off the shelf gauge and see if it matches the direct reading test gauge. I can't imagine that it wouldn't. My only concern is that any gauge used have a very tiny orifice in line in case of a leak in the gauge it doesn't dump all your oil before you can get down safely. Larry Flesner -- KRnet mailing list KRnet@list.krnet.org https://list.krnet.org/mailman/listinfo/krnet
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