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I’m considering installing EGT gauges with alarms to augment my coolent temp gauges/alarms. I’m thinking this is an overall better heads up that things are heating up. I’ve read that if you lost all coolant (blown hose) you may not get an alarm due to sensors no longer submerged in coolant.
Am I thinking corectly? Is it worth installing these? Any strong opinions?
Thanks! Joe
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Rob,
I mounted the sender units on a bulkhead higher than the motors and ran about four feet of braided fuel vacuum hose to a nipple on the back end of each raw water pump,the sender units come with a nmea 2000 T, the installation of the sender unit,plumbing and the nmea T was about an hour to install for two units.
I don’t think the info is that accurate, but it is consistent, and I’m able to monitor them for changes,the two gauges normally run within very close readings to each other, my alarms are set for 3 to4 KPA minimum from memory.
The MFD can display the info as a traditional analog style,numeric or both,alarms can be set at whatever is desirable.
To answer your question about readings – each engine
Idles at between 6- 7 KPA
2200 RPM both at 40-42 KPA
2400 RPM both at 49-50 KPAThe first time they indicated an issue to me was when an oyster shell growing inside the raw water pickup on one engine dislodged and semi blocked the intake to the strainer,water pressure at speed dropped off and I could clearly see a drop in pressure on the MFD.
On a trip in October running at 2200 RPM’s both gauges where showing similar readings of 40 – 42 KPA,the next day running home at 2200 RPM’s much the same info initially but as time went on I could see pressure falling away on one engine,there was no change in engine temp and water flow out the exhaust seemed normal, I put my hand on the raw water pump and it was cool to touch so I continued on.
For the final 5 minutes of the trip I pushed the engines up to 2400 RPM and thats when I took the attached pic,the two water pressures are indicated in the top of the graph bar as 50.60 and 32.70.I brought the engines back to idle, the water pressure dropped below the alarm trigger point and the alarm sounded on the engine with issues (the alarm is both audible and visual in a pop up window on the screen)…I pulled the pump apart and two veins had come off the impeller,others where in bad shape. Since I reassembled that pump it has consistently run at a slightly higher pressure that the other.
The gauges/alarms performed as needed and alerted me to an imminent failure on one occasion and an issue on another occasion.
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