18th November 2018 at 4:46 pm #44772AnonymousInactive
Does anyone know what these are for (see attached picture) ? I’ve always assumed one is the engine oil pressure, but not sure why there would be two. The numeric dial also seems to serve no purpose ?
Attachments:18th November 2018 at 5:00 pm #45114David BabskyParticipant
Going from memory – as I’m not on the boat just now – the left-hand one (with greater range, up to 150 psi, is the ENGINE OIL pressure gauge, and the right-hand one should be the GEARBOX OIL pressure gauge.
I’ve marked mine with a little white chinagraph-pencil mark on the black surround at the optimum pressure readings, so that I can see at a glance if all’s well (..or if oil’s well). Ditto with the temperature gauge ..so that I can see if the engine’s getting anywhere near its 99-degree TOO HOT mark.
(..And I ALWAYS check the oil level of both the engine AND the gearbox before setting off anywhere ..in Dover, the other year, I found that the gearbox was full of margarine: cracked gearbox oil cooler, so I had it replaced by those very nice engineering men just outside the marina gates, having replaced our ENGINE OIL cooler a year or two before. Now they should both last another 30 years.)
(..Wow, this great on white is almost impossible to read while I’m typing!..)
Yours, David.18th November 2018 at 5:03 pm #45117David BabskyParticipant
P.S: The upper scale is units in PSI (pounds per square inch), and the scale beneath that is the same thing but in ‘bar’ ..like vehicle tyre-pressure scales.18th November 2018 at 5:04 pm #45120AnonymousInactive
Thanks David.18th November 2018 at 5:12 pm #45123Alasdair WoodfieldParticipant
Engine oil pressure, and temperature.
The 3rd ?? How about hydraulic steering, water pressure, or perhaps ‘steam pressure’ when the skipper ‘loses it’ !?? The two pressure gauges have different scales, I don’t think engine oil pressure would go to 10Bar without something going bang. On my 331 the 3rd gauge is engine revs.
I guess the answer lies in tracing the wiring/tubing back to a sensor ?
Alasdair18th November 2018 at 5:16 pm #4512639SchussParticipant
Think the third one may be oil/ coolant temperature , usually around 90 centrigade after warming up. The sensor is in the water side, but really monitors all the engine fluids. If you suspect the impellor has lost a vane, that’s the gauge that will give you a clue, stop the engine before it boils the coolant
Graham18th November 2018 at 5:50 pm #45130Gordon PatersonParticipant
On my boat (Nauticat 40) I have two gauges one shows engine oil pressure the othe shows gearbox pressure as it is a hydraulic box.
Graham – I thought that you no longer had a Nauticat?
Gordon18th November 2018 at 6:58 pm #45133Rose-Anne BriggsParticipant
I agree, engine oil pressure and gearbox oil pressure18th November 2018 at 9:32 pm #45136Mark Ashley-MillerParticipant
Just to add – engine temp gauge (the bottom dial I guess) – I inadvertently ran my engine at 3500 rpm for 30 minutes recently and it went well over 100C – as soon as I dropped reves below 3000 it came back down to 80/90. No damage done I hope!24th November 2018 at 3:46 pm #45146AnonymousInactive
Just adding on here. On my NC33 the gauges represent Engine Oil Pressure, Gearbox oil pressure and engine coolant temperature. The reference to “bar” is the alternative pressure units (like bars or barometric pressure)2nd February 2019 at 3:08 pm #49465IngvarParticipant
On my N38 with a Ford Lehman 80 its the other way around.
The left is Gearbox oil pressure and the right one is the engine oil pressure.
According to the Nauticat manual the normal engine oil pressure is between 50-57 PSI and
the normal gearbox pressure is 106-136 PSI. So it makes sense that the left is gearbox oil because the right one can’t show the high gearbox pressure.
Ingvar in Sweden
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