07-07-2019, 11:15 AM
Sounds like your low op switch may need replacing. That chirping may be due to a soft spring that is letting the contacts bounce before the cut in level. But that doesn't mean you don't have a low op issue. Not being a Cummins guy I can't say whether that is normal for hot idle op. I would recommend you go onto boatdiesel.com, join and post. It's well worth the $25.00. Before you do however, a couple of things to do:
1) change oil filter to make sure it didn't collapse internally (unlikely but possible)
2) make sure the oil level is below the full line to rule out foaming
3) record Cold OP on each engine
4) record both engine hot OP at RPMs idle, 1000, 1500 and 2000 ideally with mechanical OP gauge. Otherwise note that you swapped senders when posting
5) get/post engine hours and HP rating
6) if possible record coolant temps with IR gun (thermostat housing) Hotter engine will run lower OP especially at idle. Also if you can compare temp readings of oil lines as they enter cooler.
7) any other pertinent info such as if the op suddenly dropped or came down over time.
The counter rotating gear always makes the one engine work a little harder and consequently heats up more so it could simply be hotter oil. No two engines will run the same OP. Never the less there are some really good mechanics on that site who will help you neck down probable causes or put your mind at ease. Best of luck.
1) change oil filter to make sure it didn't collapse internally (unlikely but possible)
2) make sure the oil level is below the full line to rule out foaming
3) record Cold OP on each engine
4) record both engine hot OP at RPMs idle, 1000, 1500 and 2000 ideally with mechanical OP gauge. Otherwise note that you swapped senders when posting
5) get/post engine hours and HP rating
6) if possible record coolant temps with IR gun (thermostat housing) Hotter engine will run lower OP especially at idle. Also if you can compare temp readings of oil lines as they enter cooler.
7) any other pertinent info such as if the op suddenly dropped or came down over time.
The counter rotating gear always makes the one engine work a little harder and consequently heats up more so it could simply be hotter oil. No two engines will run the same OP. Never the less there are some really good mechanics on that site who will help you neck down probable causes or put your mind at ease. Best of luck.