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QSB 6.7 Crank Case Pressure
This topic has 2 replies, has 2 voices, and was last updated by
1 year ago
March 21, 2023 at 11:08 am A recent pre-sale engine survey on a family member’s boat indicated: BLOW BY TEST:<br />Crankcase blow by test was performed using a Cummins Insite program and<br />laptop computer. Port CCP was 5.7 InH20, which is above average and<br />starboard was 4.4 which is also above average. The engines are 2014 (330 hrs) Qsb 6.7 480hp. Engines run good, no smoke, no oil leaks. Turbos intake side appear OK. What should be conside…
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in: Cummins Marine Engines
2 RepliesMarch 23, 2023 at 11:47 am Thanks Tony for the response- we won’t worry about the CCP. Aftercooler housings were no good in 2018 and replaced with new and greased. We added freshwater flush at that time.Ā Just pulled the cores after five years and they came apart easily and look serviceable, pics attached.Ā JoeLast Post by:
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Exhaust Elbow Design
This topic has 4 replies, has 3 voices, and was last updated by
March 21, 2022 at 8:55 am Ā While I had the heat exchanger removed for cleaning, I took some pictures of the exhaust elbow which I think the manufacturer used a wet elbow on the Albin 32+2?? I think it is also bronze as I checked it with a magnet so hopefully not prone to corrosion. This is a 98′ 6BTA Engine with about 1800 hrs and runs good, no issues. It is tight quarters for the exhaust elbow and exit and was wondering if you aware of any known issues on the Albi…
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in: Cummins Marine Engines
4 RepliesMarch 24, 2022 at 11:35 am I have a 1999 32+2 (Yanmar 6LY, but similar enough constraints) and had Tony look at the exhaust when I bought the boat. I replaced the exhaust elbowĀ with a stainless version from Seaboard (they welded on a temp sensor to alarm a loss of raw water flow) and installed a fresh water flush system. The injection height above waterline is more than adequate.Ā I was advised that while the elbow wouldn’t fully self drain the fact that it is heav…Last Post by:
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QSB 6.7 Aftercooler Service-RTV?
This topic has 4 replies, has 4 voices, and was last updated by
October 17, 2018 at 11:47 am We asked a Cummins tech to service the aftercoolers on QSB 6.7s and reinstall with Alco Metalube per the guidance on this site. The tech recommends Cummins PN3164067 (Loctite 5699 Grey RTV silicone sealant) to seal between the brass endcaps and aluminum housing ( to better fill any pitting), with the Metalube on the bolts. Is this an appropriate use for the RTV or should we insist on the Metalube? Coolers haven’t been pulled yet so condit…
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4 RepliesOctober 18, 2018 at 8:12 am Got it, thanks all. JoeLast Post by:
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QSB 6.7 Re-Rating 480 to 550
This topic has 5 replies, has 3 voices, and was last updated by
5 years ago October 2, 2018 at 2:12 pm Hello All, Iām helping a family member in Florida with his boat, a recreational sportfisher with twin QSB 6.7 480HP@3300 (CPL 4191) with ZF 2800 series pods. New it turned 3350 at WOT. Now, with added gear, dirtier bottom, etc it is operating above the Cummins prop demand curve at cruise and only reaching ~3200 WOT. One option is to change props ($$ x 4). Is it feasible to change motor to the intermittent duty rating of 480HP@3000 RPM or HO of …
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5 RepliesOctober 6, 2018 at 7:12 am Steve, I think you are over thinking this, or maybe you are thinking this way ?? Yesāall of the CPL4191ās are the same engine internally so put them all on a dyno at 15 GPH @ 2600 RPM and they will all āwear outā at the same rate.. IMO, the prop curve fuel burn has nothing to do with itā¦ā¦ā¦..But with that said, (another IMO), in general, the higher RPM you pull that HP at (ABOUT 300HP) , the easier it is on the engine ( like on the 3300 RPM v…Last Post by:
posted: 5 years ago
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QSB 6.7 Crank Case Pressure
