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    • Cummins Marine Forum Topics
    • Belt rotor bearing 3970139

      This topic has 5 replies, has 4 voices, and was last updated byTony Athens 6 years ago

      August 1, 2017 at 2:49 am The bearing on the starboard engine decided to give way. The original bearings from Cummins cost $176 per piece and there are those available for Dodge costing about $50. Are the 2 bearings of the same quality? Is it super critical to replace it with original parts? From reliability stand point. Secondly, since the starboard bearing is busted, should the port be replaced at the same time? Is there some kind of life span? Thanks James

      Started by: Teck Foo James in: Cummins Marine Engines


      5 Replies
      August 1, 2017 at 7:21 am https://www.sbmar.com/articles/qsb-screaming-fan-hub-bearing-failure/

      Last Post by: Tony Athens posted: 6 years ago

    • Cummins QSB 5.9 fuel flow calibration

      This topic has 5 replies, has 3 voices, and was last updated byTeck Foo James 6 years ago

      December 7, 2016 at 1:38 am I have a pair of QSB 5.9 355 hp. 476 hours. Both engines have different consumption figures at same RPM. Both props were recently de pitched because the previous owner’s log recorded WOT at 2650 RPM 26.5 knots. Had the prop pitched reduced by 1.5 inch (could be a mistake) and now WOT 2890 RPM 26.5 knots. Props are 4 bladed 21 x 24.5. At 2600RPM 24 knots. With the great difference in fuel consumption, it is difficult to determine which is c…

      Started by: Teck Foo James in: Cummins Marine Engines


      5 Replies
      May 18, 2017 at 1:16 am Installed the vacuum gauges, reading normal Check engine rpm reading on Smartcraft with handheld tachometer – results 2 rpm difference. Check gearbox output shaft rpm with handheld tachometer -less than 0.3% difference. Pulled out the prop to check the pitch by the prop shop that re pitched the prop – result – both prop has same pitch reading Not happy with the prop shop, went to another prop shop – pitch the same but the…

      Last Post by: Teck Foo James posted: 6 years ago

Viewing 2 topics - 1 through 2 (of 2 total)