MichaelD
Veteran Member
BL 4588 with twin Hinos about 1800 hours. Well maintained.
Recently this thing happens on port engine only. At about 1400 rpm and above, oil press gauge suddenly either drops to zero or starts flopping around. It does this instantly rather than at pace a change in real oil pressure would occur. When it occurs, the tach also becomes a bit unstable, usually rising a couple hundred rpm, but the engine sound does not indicate a real change. Sometimes changing from 1400 to say 2200 will clear it for awhile. Then it may recur, sometimes not though. Otherwise, the engine runs perfectly.
So, I’m thinking this has all the earmarks of an electrical issue vs oil pressure issue. When I looked I found connection on oil sensor a little loose and tightened it. This seemed to help for a while, but the problem recurred. I’ve found no other obvious connection problems. Maybe the sensor is having an internal failure. But, am I right in thinking it’s electrical? I don’t see how pressure/flow issues could produce the instant on/off indications on the gauge.
I’d appreciate any insights.
Recently this thing happens on port engine only. At about 1400 rpm and above, oil press gauge suddenly either drops to zero or starts flopping around. It does this instantly rather than at pace a change in real oil pressure would occur. When it occurs, the tach also becomes a bit unstable, usually rising a couple hundred rpm, but the engine sound does not indicate a real change. Sometimes changing from 1400 to say 2200 will clear it for awhile. Then it may recur, sometimes not though. Otherwise, the engine runs perfectly.
So, I’m thinking this has all the earmarks of an electrical issue vs oil pressure issue. When I looked I found connection on oil sensor a little loose and tightened it. This seemed to help for a while, but the problem recurred. I’ve found no other obvious connection problems. Maybe the sensor is having an internal failure. But, am I right in thinking it’s electrical? I don’t see how pressure/flow issues could produce the instant on/off indications on the gauge.
I’d appreciate any insights.