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- Cummins Marine Forum Topics
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qsb 6.7 stalls when it revs up in reverse
This topic has 2 replies, has 2 voices, and was last updated by
1 month ago
April 12, 2024 at 4:22 am Ā I have a Qsb 6.7 . Runs fine in neutral and forward . When I shift into reverse it runs fine , but when I rev up any in reverse it stalls out . ļæ¼ļæ¼starts back up and runs fine . The linkage is properly adjusted . Mechanical shift zf280a gear No neutral safety switch ļæ¼ nothing in the running gear ļæ¼possibly in the throttle pot connection?
2 RepliesApril 12, 2024 at 2:44 pm just started recently engine has about 4k hours. I will take some pics when I go to the boat tomorrow. the throttle pot is not in the best location and has gotten slightly rusty over the years, Ā cleaning the connections is on the priority list.Last Post by:
posted: 1 month ago
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Chronic high pressure fuel pump bearing failure.
This topic has 1 reply, has 2 voices, and was last updated by
1 month ago April 12, 2024 at 3:16 am Has anyone experience unusually high failure rate of front bearing on HP fuel pump part# 3973228? I’m about to put on a 3rd one in the span of a year. The first one lasted a couple of weeks in May 2023. the second one failed this month (11 months later). This last failure caused the gear to drive into time cover case causing serious damage with over a cupful of metal shavings. Going to have to drop oil pan and replace timing cover case. An…
1 ReplyApril 12, 2024 at 12:48 pm Exact model engine & serial number Complete history of theĀ engineĀ Good pictures of the engine & installation From what you posted, I guess you have pictures of the failures?Last Post by:
posted: 1 month ago
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QSC8.3
This topic has 1 reply, has 2 voices, and was last updated by
1 month ago April 11, 2024 at 2:26 pm What size micron filters does Cummins recommend using?
1 ReplyApril 11, 2024 at 4:54 pm PER THE BOOK— ATTACHED ~~~~~~~~~~~~~~~~~~ Practical and long term proven answers areĀ below for marine applications Marine Fuel Filtration āThe Seaboard WayāLast Post by:
posted: 1 month ago
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Qsb 5.9 belt squeak at startup
This topic has 6 replies, has 4 voices, and was last updated by
1 month ago April 8, 2024 at 1:01 pm Iāve read the other posts here on this topic with no luck. Every initial startup, the belt squeaks for 5-10min. Then no noises the rest of the day. Iāve Ā replaced belt, fresh water pump, raw water pump, tensioner, and alternator. Iāve noticed a lot more belt dust on that motor than the other and am at my wits end. Could the alternator be working too hard initially? It shouldnāt, as the batteries are always on the charger. I also could not find t…
6 RepliesApril 11, 2024 at 4:40 am Joe, Glad you sorted out theĀ what belt.Ā Great trick Next–Could the alternator be experiencing an abnormal draw at warmup?Ā 100% yes, but the only simple way to know is if you are monitoring battery terminalĀ voltage just before turning the key and watching it after start-up/warming up Say you are at 12.4-12.6-ish at the battery terminal and your cold alternator regulator set point is 14.0V.Ā The alternator will go t…Last Post by:
posted: 1 month ago
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Qsb 6.7 leaking water out of both check valves on the aftercooler
This topic has 1 reply, has 2 voices, and was last updated by
1 month ago April 4, 2024 at 4:57 pm Hey everyone. I have a water leak coming out of both my aftercoolers. Itās leaking out of the check valve or condensation drain on the bottom of the aftercoolers. Starboard is worst than the port. Port being more like a sprinkle and the starboard more like a constant trickle of water. Could this be a good indicator for a damaged core?
1 ReplyApril 10, 2024 at 4:28 am 1————Taste the water– If salt water, you haveĀ issues that must be dealt with ASAP 2———-Last time your aftercoolers were off the engine and serviced per my protocols?Ā 3— Vintage of the engines– Years in service and total hours 4—-When did you start noticing the leaking? 5——-Post good pics of the overall installation– let me see what y…Last Post by:
posted: 1 month ago
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Feeding 6CTA 8.3 with a backup pump
This topic has 1 reply, has 2 voices, and was last updated by
1 month ago April 3, 2024 at 10:10 am After installing the SBM DD filter system, I want to plum it so I can bypass these filters in the event of an at sea clogged filter. I have a separate filter system using FS1218 and a Morco pump. I can easily plum this system to feed both my engines in case of a failure. This pump is capable of 2.5 GPM and up to 20PSI. Is it OK to have this feeding my engines? My current system is gravity feed, so I don’t know what kind of head pressure is…
1 ReplyApril 10, 2024 at 4:19 am 20 PSI is OK–Ā Be sure youĀ put monitoring gauges on the custom system.Last Post by:
posted: 1 month ago
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Cummins 4BT high idle????
This topic has 1 reply, has 2 voices, and was last updated by
1 month ago March 29, 2024 at 1:41 pm Hello Guys,<br />My 4BT was actually a 4BTA that someone deleted the after cooler and recalibrated the Bosch high pressure pump. That last view weeks when I go to just start and run my engines to exercise them, I noticed my port engine warming up quicker and today I realized it was idling at 1200 rpmās. My starboard engine idles at 800rpms. I was curious if this could be a caused by a build up of some type, since I have only been idling th…
1 ReplyApril 10, 2024 at 4:06 am Post very good pictures of the engine–all of it–especially the area on and aroundĀ the injection pump and all modified plumbingLast Post by:
posted: 1 month ago
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6BTA 330 – What is this tube?
This topic has 1 reply, has 2 voices, and was last updated by
1 month ago April 8, 2024 at 1:52 pm What does this tube do?Ā Noticed it while I had the aftercoolers off for servicing.Ā No issues with it just curious for general knowledge of my engines. 2008 6BTA 330 Thanks!
1 ReplyApril 10, 2024 at 3:57 am Stand back a few feet— I want to see the entire engine– top, sides & front viewsĀ Ā The hose in question– does it stop there,Ā or does it go forward towards the front of the engine ?Last Post by:
posted: 1 month ago
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QSC 8.3 turbo
This topic has 6 replies, has 2 voices, and was last updated by
1 month ago April 8, 2024 at 4:09 am I’m looking for a QSC turbo. Ā Ā The part number on the turbo is 40387490, which doesnt match up to anything listed for that motor on this site. Ā Any ideas?
6 RepliesApril 9, 2024 at 6:57 pm All looks very good to me……..USE the Graphite gasket ( not the OEM SS one) — new hardware with never-seize on the boltsLast Post by:
posted: 1 month ago
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QSB 6.7 Fuel Pump question
This topic has 4 replies, has 3 voices, and was last updated by
1 month ago
April 4, 2024 at 3:58 pm An acquaintance of mine made a mistake. He was changing his fuel filters and started his engine without turning the fuel feed and return lines on. He stated he let it run for about 5 seconds, noticed it sounded rough, and then again for about 10 seconds. He said he ended up with about a pint of diesel in his bilge with spray around the fuel pump. He cleaned it up, and the engine ran fine. However, he noticed a slight diesel residue at the bottom…
4 RepliesApril 8, 2024 at 4:36 pm Thanks Clark, my parts book shows a breakdown of the fuel pump with three o rings, but curiously doesnāt show the shaft seal. His engine is the same as mine. We will see what happens.ĀLast Post by:
posted: 1 month ago
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6CTA Air Filters – 2 part question
This topic has 5 replies, has 5 voices, and was last updated by
1 month ago
April 5, 2024 at 9:32 am Looking to either service or replace my air filters… SN 46309849 SBMar store states S&B Air Filters DO NOT replace Walker Air-Sep filter elements. I don’t know what a Walker Air Sep filter is.Ā Current one has a metal end cap and some holder springs..Ā Second part – I highly doubt the air filter has ever been changed in the life of the boat.Ā How much of a service item is this really for people?Ā Is this a regular se…
5 RepliesApril 8, 2024 at 2:40 pm The Walker Air Sep is intended to separate the oily vapour ejected from the crankcase from the actual air flow so the oil can be discarded without fouling the air filters s0Ā quickly. Seaboards’Ā crankcase venting is another way to do the same thing.Ā Ā Look it up.Last Post by:
posted: 1 month ago
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Intake Manifold Temp alarm
This topic has 2 replies, has 2 voices, and was last updated by
1 month ago
July 1, 2020 at 8:25 am I have a 540 QSC and just recently started to experience the IMT alarm. The DieselView display shows 160-170 degrees, which, from what I understand, is too hot. The other day, I pulled the endcaps on the cooler and found the water side to be rather clean. I did chip some calcium buildup out, but everything seemed to be in the ordinary. After putting everything back together, I went for a test ride. The temp stayed at 145 throughout all spectrums…
2 RepliesApril 8, 2024 at 1:10 pm Sorry I didnāt reply to this 3 yrs ago. lol. It ended up being a faulty sensor.ĀLast Post by:
posted: 1 month ago
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Rust in Coolant pipe
This topic has 2 replies, has 3 voices, and was last updated by
April 4, 2024 at 10:12 am Took the heat exchanger off my 6bta to get cleaned. Going to reinstall it with all new hoses and found the pipe leading to the thermostat to be extremely rusted. Anything I should do for this issue? Or just flush remaining coolant as much as possible and fill with new?
2 RepliesApril 8, 2024 at 11:57 am If you can, take a sample of the so called coolant and send it to an oil testingĀ lab.Ā Yes, they do coolant testing also. Heavy rust like that says you have had seawater enter the engine which could do interior damage. Pressure test the system for leaks. Remove as much rust as you can.Ā Ā Then use a product such as Cummins cleaner,Ā RESTORE, following directions for treatment AND removal/flushing.Ā Ā Be prepared to do it a couple of times.Ā Ā Ā R…Last Post by:
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Sharing QSB 5.9 Freshwater Flush Zincs
This topic has 3 replies, has 3 voices, and was last updated by
1 month ago April 3, 2024 at 11:17 am Hello forum members, I figured I’d share the pictures of the three zincs removed from the QSB 5.9 480 after a five month summer season up here in Kittery Maine. I was diligent in freshwater flushing the engine after each use. Total hours on the season was +- 150 hrs. burning 4 gal/hr on the season. From L to Right: Bottom of after cooler…..Top of aftercooler….Heat exchanger. Note the degradation in the bottom aftercooler zinc&#…
3 RepliesApril 5, 2024 at 8:36 am 100% freshwater hose blasting away through the T adaptor with engine seacock “closed in the video” and engine running. About halfway through the season I flushed with seacock “open”. It was a bugger reaching down and closing the 2″ seacock and then re-opening. I also think the zincs look normal. Prop shaft & rudder zincs (Godfrey brand, not cheap Camps) about 70% consumed, no complaints. The proof of the results…Last Post by:
posted: 1 month ago
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Aneriod Adjustment?
This topic has 12 replies, has 5 voices, and was last updated by
1 month ago
February 27, 2024 at 7:05 am I have a pair of ’99 6CTA’s with 2,400 hours.Ā I’ve owned the boat for 13 years and these engines have been great.Ā But, on takeoff, the srtb engine shows some black smoke and needs a little more throttle than port to get the turbo to kick in.Ā It has always done this.Ā Once on plane, all good.Ā Just when getting on plane does this happen. I remember a “lazy Aneroid” discussion here, and thought this might be the ca…
12 RepliesApril 4, 2024 at 11:01 am Finally figured it. Turbo – leaking oil and sent out to Turbo Dave for new cartridge – result – brought boost up 10 lbs Turbo pipe gasket leaking after rebuild – found that and got a little more boost going where it was supposed to go. Rebuilt fuel pump was in the equation also – after confirming boost was back up, had to adjust the AFC a few more clicks to get it just right. Results – engines spool evenly and…Last Post by:
posted: 1 month ago
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6cta slow acceleration and black smoke
This topic has 2 replies, has 3 voices, and was last updated by
1 month ago
April 3, 2024 at 8:16 am I am having slow acceleration and black smoke from 1300 to 2200 rpms. Takes about 15-20 seconds to go through that rpm range. Boat is 40ā Ā just had bottoming done, serviced aftercoolers, heat exchangers, impellers, and fuel. I do not have boost gauges.Ā
2 RepliesApril 3, 2024 at 11:34 am No idea why you’d check your fuel filters w/black smoke, but the air filter isn’t a bad idea.<br /><br />Better than that, navigate to the low power troubleshooting guide on this site and go through it step by step.Last Post by:
posted: 1 month ago
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Constant Torque Hose Clamps
This topic has 7 replies, has 6 voices, and was last updated by
1 month ago March 27, 2024 at 9:14 am Curious if there is any specification or guidance on tightening these hose clamps.Ā My impression is that the spring needs to have some give both to tighten and loosen to allow expansion.Ā Ā Anyone have any advice vs just tightening them ‘tight’ like normal hose clamps.
7 RepliesApril 3, 2024 at 4:53 am The tool that FireIsland1 indicated shows a torque of 60 inch pounds( as pictured on amazon) which is in range favoring the higher end.Ā I will add that tool to my kit.Ā Thank you all for some good ole learning.Last Post by:
posted: 1 month ago
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6CTA Port Cruising Temp 170
This topic has 6 replies, has 5 voices, and was last updated by
1 month ago
July 13, 2023 at 8:57 am 2001 6CTAās on a Tiara 3800 Open I did my aftercoolers last winter (18 months) and was running at 160 on both at cruise. One was horrible corroded ended up getting a new one from you guys.Ā Only at WOT would they go to 170ish. A few days ago my gauge was spiking to 180 for a split second and then dropping back down. Almost looked like a gauge electrical issue because of the speed of the up and down. Then I started paying more attention and at cr…
6 RepliesApril 2, 2024 at 5:57 pm I have the mechanicals so I can’t see my fuel burn but I am WOT at 2600ish RPM at around 30-31kts. I’m pretty confidence I am propped correctly. I think this slightly higher temp is this clogging of the aftercooler as it looks to be wiping out like 20% of the water flow. I don’t know what caused the white buildup, but the rubber impeller parts getting through could definintely have caused this. My issue now is that core is stuc…Last Post by:
posted: 1 month ago
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SMX 1730 Leak
This topic has 3 replies, has 2 voices, and was last updated by
1 month ago
March 29, 2024 at 2:00 pm I purchased the pump for a ReCom 370 B and had my mechanic install 4/22. Launched boat for the season yesterday and noticed what appears to be corrosion below the bottom wrap hole on the pump and salt on the mounts. Pumps has less than 200 hours on it. What are my options? I replaced the Sherwood that came with the engine that lasted 5 years and 1400 hours. Only reason I replaced it was because I was afraid of a failure based on what I was readi…
3 RepliesApril 2, 2024 at 11:50 am Tony, Thanks. I cleaned the area up and ran it for 20 min at idle at various RPMs from low to medium and noticed water on the paper towel I put below the pump so it appears it needs replacement now. Is there any way you can send me an exchange pump so I can have my mechanic remove and install the same day? Iāll give you a credit card number if needed. The issue with sending it back is that I have have to pay my mechanic twice to re…Last Post by:
posted: 1 month ago
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QSC exhaust flange
This topic has 4 replies, has 2 voices, and was last updated by
1 month ago
March 9, 2024 at 1:59 pm I’m looking to the name or part number for the attached flange. Ā It has 6 broken bolts,and i may be better just replacingĀ Thanks
4 RepliesApril 2, 2024 at 11:10 am I may need that flat flange. Ā I think it was being use as a spacer. Ā With it, the mixing elbow lines up perfectly with the muffler input. Ā Please let me know if you have one… ThanksLast Post by:
posted: 1 month ago
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qsb 6.7 stalls when it revs up in reverse
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