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    • Cummins Marine Forum Topics
    • cooling water pressure

      This topic has 2 replies, has 3 voices, and was last updated byEdwin Harvie 2 years ago

      May 26, 2021 at 3:57 pm QSB 380 always 176 Deg. @2,000RPM. I have Borel exhaust alarms but I was wondering if itā€™s a good idea to have an actual water pressure gauge. I always had them on my outboard and they were a great way of seeing trouble before itā€™s costly. I am 150 hours on my impeller and will change it out this week. I put a gauge on the 1/4ā€ npt outlet port on the top of my Sherwood pump for testing. I got 4lb at idle and 13lb at 1,800 rpm. I donā€™t know if th…

      Started by: Fireisland1 in: Cummins Marine Engines

      2 Replies
      May 27, 2021 at 11:05 am yes. details here: raw water alarm options I see 6-7 psi at 2300rpm cruise on a Sherwood GC5 pump. Barely registers at idle

      Last Post by: Edwin Harvie posted: 2 years ago

    • 160Ā° Thermostats in a 6B: What is normal behavior?

      This topic has 17 replies, has 8 voices, and was last updated byTony Athens 2 years ago

      May 24, 2021 at 5:56 am Twin 6bta 370’s, 1996 manufacture date, 1600 hours. I was battling engine temps that were creeping to 195Ā°F last season. So this offseason I took off heat exchangers, aftercoolers, gear coolers (fuel coolers were deep-sixed), rodded, acid washed, new gaskets/orings etc. There was some significant blockages in the heat exchangers around the zincs. I also decided to swap to 160Ā°F thermostats so I wouldn’t spend 50% of my time starin…

      Started by: JimmyK in: Cummins Marine Engines

      17 Replies
      May 25, 2021 at 7:04 pm For JimmyK, My thoughts on all of this go like this….. We spent a coupe of years trying to come up with a thermostat that gave the B more protection & time to respond to any over heat issue….This is what we came up with as a best compromise .. Sure, I’d like the engine to heat to 180F at fast as possible and then have thermostat that was so “variable” that if the temp went to 181-185f it world bring the tem…

      Last Post by: Tony Athens posted: 2 years ago

    • Hose ballooning at aftercooler

      This topic has 11 replies, has 6 voices, and was last updated byEdwin Harvie 3 years ago

      March 20, 2021 at 8:21 am Went for a 2nd sea trial after completeing a aftercooler, heat exchanger , impeller service, Port engine hose at aftercooler looked like it was going to explode at 2000 rpm starboard side perfect… Does that hose have pressure, i know mechanic used a regular radiator hose

      Started by: Jeff Lewin in: Cummins Marine Engines

      11 Replies
      March 22, 2021 at 6:51 am I installed an outboard-style water pressure gauge to monitor impeller condition, but should also indicate any plugging trends in the system. Runs about 5-6 psi at cruise. raw water alarm options

      Last Post by: Edwin Harvie posted: 3 years ago

    • 1995 Cummins raw water pump

      This topic has 5 replies, has 3 voices, and was last updated byTony Athens 3 years ago

      September 25, 2020 at 5:11 pm Hello, I’m a Cummins newbie. Just bought a 1996 Bayliner 3587 with 2 6BTA 250 Hp engines. I am trying to get to a zero standpoint for all maintenance items that have not been done. The raw water pump impellers are about 2-1/2 years old, so I want to throw some new ones in there and carry some spares. None of the pumps that I see for sale here look like ones on my boat. They have 4 bolts that hold the plate on, and all the ones I see h…

      Started by: Kurt Luebs in: Cummins Marine Engines

      5 Replies
      September 30, 2020 at 7:28 am These are Sherwood 1730’s (99%)–you are up too close .. Get back a few feet and let me “SEE” the entire side of the engine and the plumbing that goes from the pump to ??..

      Last Post by: Tony Athens posted: 3 years ago

    • raw water alarm options

      This topic has 6 replies, has 6 voices, and was last updated byDan 3 years ago

      August 20, 2020 at 7:22 am whats the best sensor? water loss at mixer or paddle type? are there advantages one over the other?

      Started by: eddie in: Cummins Marine Engines

      6 Replies
      August 22, 2020 at 4:33 am I have outboard water pressure sensors that network through NMEA to my Simrad MFDā€™s,water pressures are displayed on screen continuously. They have adjustable alarm settings that generate an audible alarm and a flashing popup warning on screen when pressures drop below the setpoint, connected directly to the output side of the water pump. Pressures on screen in the pic shown as 71.00 and 72.10 KPA. https://www.lowrance.com/lowrance/type/sensors-…

      Last Post by: Dan posted: 3 years ago

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Viewing 5 topics - 1 through 5 (of 5 total)