Oil pressure
zaverin1
Member Posts: 1,672 ✭✭✭
I have twin 4.3 mercs.
i had the engines running at the dock yesterday and noticed something weird.
cold start at idle oil shows 40 on port and star Gages.
if I increase the Rpms on the star engine oil jumps to 55 - 60 and stays there never falling to 40. If I keep giving it throttle it does move from 55 to higher reading and then back to 55.
if I shut the engine down and restart it still shows higher then port. Only on cold starts it reads identical
bad gage or sending unit?
i might check the wires to make sure there are not loose.
all other readings are indebtic all to each other and idle and sync is spot on
i had the engines running at the dock yesterday and noticed something weird.
cold start at idle oil shows 40 on port and star Gages.
if I increase the Rpms on the star engine oil jumps to 55 - 60 and stays there never falling to 40. If I keep giving it throttle it does move from 55 to higher reading and then back to 55.
if I shut the engine down and restart it still shows higher then port. Only on cold starts it reads identical
bad gage or sending unit?
i might check the wires to make sure there are not loose.
all other readings are indebtic all to each other and idle and sync is spot on
Comments
PC BYC, Holland, MI
i will start checking
during original startup Gages read 40 at idle
star engine jumps to 55 or 60 at rev but then never really falls. If you restart sometimes it goes back to 40 or reads high.
could be the wiring or pressure switch or gage lol.
the sensor is just beyond the filter... flow doesn't create pressure, pressure can be a measurement of flow, though.... your filter may be compromised and your pressure off. it may be bypassing the filter altogether.
i know I have remote filters and I replaced them this year.
i will check the wire on top and bottom sensors
If you used mercruiser high efficiency filters they are very well constructed and likely to have similar tolerances. I replaced them a number of times on twin engines with Vessel View systems. Oil pressures were always very similar although they can change a bit between engines and even between engines after an oil and filter change.
But, IMO wild swings look like wiring (ground always the first culprit to look for) then the oil pressure sender.
As far as gauges, if you have Faria gauges well.......