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- Cummins Marine Forum Topics
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2002 6BT Running rough ,white smoke too
This topic has 14 replies, has 6 voices, and was last updated by
1 year ago September 17, 2022 at 7:52 pm 1300 hour engine, on the Great Loop for 2 months- running fine until…. We had the aft section of the 5″ exhaust hose in the eng compartment split open while running. Noticed it when I went to throttle up from a 1600 rpm cruise. Engine did not respond. Pouring out black smoke as the diesel was ingesting it’s own exhaust. Shut it down, bandaged up the hose and idled 5 miles to marina. No overheat, good oil pressure through out in…
14 RepliesSeptember 21, 2022 at 4:19 am “given the pictures, do you see space for a better solution here?” Go as high as you can with a dry riser, come down steep into a showerhead and then angle it into your exhaust going aft.Ā A surge tube would be a nice addition.Ā Something very much like this.Last Post by:
posted: 1 year ago
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P7100 throttle lever
This topic has 3 replies, has 3 voices, and was last updated by
1 year ago
September 6, 2022 at 5:15 pm The other day I was out cruising and an engine started slowing down. At one point I could only get 2300 out of the starboard 4BTA-250. Ā I started with the simple stuff while drifting and right away found the throttle lever was loose on the splined shaft, so I took it off to see what happened. Seems like it was mounted to far in on the shaft and stripped out the splines on the shaft itself. I was able to move it out on the shaft and picked up goo…
3 RepliesSeptember 20, 2022 at 3:50 pm āmysterious washerāLast Post by:
posted: 1 year ago
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Mechanical 6CTA magnetic tach sender wiring
This topic has 1 reply, has 1 voices, and was last updated by
1 year ago
September 20, 2022 at 4:58 am Hi. The mechanical B/CĀ wiring diagram in Tony’s Tips doesn’t include the magnetic tach sender wiring. I’ve got cable-driven tachs on the 1969 Chris Craft Roamer 46 I’m doing a complete refit on, but I recently installed throttle cables in preparation for splashing the boat next month (first time since the PO hauled the boat and left it in Purgatory Row back in 1985!). I also installed an Accusync twin engine synchronizer…
1 ReplySeptember 20, 2022 at 5:10 am I tried to edit the post above but when I hit ‘submit’ I got a page telling me “Sorry, you have been blocked You are unable to access sbmar.com” Anyway, the additional info I was going to provide is that my mag tach senders have three wires coming out of them–black, red, and green. Presumably black is ground and red and green are signal. If so, should I use the same wires from each sender? Does it matter which one I…Last Post by:
posted: 1 year ago
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Old block, long block, rebuild block
This topic has 1 reply, has 2 voices, and was last updated by
1 year ago September 9, 2022 at 6:53 pm Hey guys I picked up an old 6bta with āblow byā. Turns out cylinders 1 and 5 are out of round by .15mm. Iām planning to get a long block and swap the parts over but I think itād be a fun winter project to rebuild this original block. Does anyone have any advice on boring out or sleeving an old block? Or is it not worth it and I should just send it in as a core? The last block I found was not eligible for core submission through sbmar, not sure i…
1 ReplySeptember 20, 2022 at 5:10 am A proper engine shop can bore your block and use genuine Cummins oversize pistons–IMO, the right way to goĀ ( NOT sleeves)ĀLast Post by:
posted: 1 year ago
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2001 6CTA wont return to idle
This topic has 1 reply, has 2 voices, and was last updated by
1 year ago August 29, 2022 at 7:10 am Have a 2001 Searay 420 AC with a pair of 6CTA’s.Ā After running up to cruise at 2150 the port motor will not return to idle.Ā It will stay at 1000 rpm.Ā shift to neutral shut down and restart engine will return to idle.Ā If you bring it up past about 1300-1500 it will again not return to idle.Ā All Mechanical controls.Ā Glendinning syncronizer is configured with Starboard motor as slave, though I suspect the syncro is irrelevant in this si…
1 ReplySeptember 20, 2022 at 5:03 am Post real good pictures of the injectionĀ pump showingĀ allĀ ( linkage, fuel solenoid, etc etc..)Last Post by:
posted: 1 year ago
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6BT5.9 Electric Fuel Pump
This topic has 3 replies, has 2 voices, and was last updated by
1 year ago September 17, 2022 at 9:09 am I would like to replace the std lift pump with an electric version. Suggestions on which one to purchase and install would be appreciated. Thanks
3 RepliesSeptember 18, 2022 at 9:24 am Post a picture(s) like this.Ā Ā Ā Let the forum see what we are trying to work with. Your pictures make no sense to meĀ Genuine Cummins pump?Last Post by:
posted: 1 year ago
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2002 6CTA (720 hours) Alum. in Oil Samples
This topic has 1 reply, has 1 voices, and was last updated by
1 year ago
September 18, 2022 at 4:35 am I am looking at a 2002Ā 42′ Silverton with twin 6CTA engines.Ā Ā The oil sample came back with high levels of aluminum present in both motors.Ā The oil has approx. 40 hours of run time on it but we also do not know what brand was used during the last change.Ā I also find it odd that both engines samples came back so identical to one another.Ā Both engines turn over without any hesitation from a cold start.Ā There is no smoke when running, t…
1 ReplySeptember 18, 2022 at 7:47 am Test ResultsLast Post by:
posted: 1 year ago
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Not boosting
This topic has 7 replies, has 4 voices, and was last updated by
1 year ago August 8, 2022 at 4:01 am My port cummins 6cta 450 diamond would not boost on the way home last night.Ā Little history first.Ā The entire salt water cooling side was removed and cleaned last winter.Ā Antifreeze flush and new put in. Fresh belts and less then 25 hours on the new fuel filters. Also new gear case and gear case cooler in April.Ā Last Saturday I did a quick dive and cleaned the bottom which was very minimal but I did have to tighten the port prop a bit but I …
7 RepliesSeptember 18, 2022 at 6:30 am At this point,Ā only reallyĀ good pictures of of the engine ( especially of the fuel injection pump) may give the forum a clue so we can all see what we are trying to deal with.Last Post by:
posted: 1 year ago
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Can't start 6BTA5.9-M2 300 – Gremlins
This topic has 4 replies, has 5 voices, and was last updated by
1 year ago August 16, 2017 at 11:50 am Hi All, last weekend I tried to start my 6BTA5.9-M2 300’s (CPL1613) but couldn’t start the starboard engine. I began by turning both switches to the ON position to check the warning alarms and let the Aetna digital tachs ‘boot’. Everything looked and sounded normal, so I started the port engine. A couple of seconds later, before I tried to start it, the starboard warning horn went silent and the starboard instruments a…
4 RepliesSeptember 17, 2022 at 12:36 pm Hereās the dealā¦ā¦ā¦ā¦ā¦ā¦..Look for the harness 10 pin plug on top or near the bellhousing / gear areaā¦ā¦.On the<strong class=”gdbbx-bbcode-bold”>Ā engine sideĀ of the plug, youāll see a BULGE in the harness/some heat shrinkā¦ā¦ā¦.Get a razor blade and start cuttingā¦ You figure out what the couch engineers did and when you come back and post, youāll still be shaking your head as to āwhat were they thinkingāā¦ā¦..Maybe what they smoked back…Last Post by:
posted: 1 year ago
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Nippon Denso Throttle Tightness
This topic has 1 reply, has 2 voices, and was last updated by
1 year ago September 16, 2022 at 8:16 am I have an older Cummins 6BTA5.9 CPL 1928, ESN 45129316 with the Nippon Denso Injector pump. The throttle cable has always been pretty tight (i.e. hard/harder to move) than I felt it should, so, I decided to do a little investigation and replace what I thought would be a Teleflex/Seastar cable that was bad.Ā I was fairly sure the culprit was going to be the cable from the upper helm (fly bridge) to the lower helm since it was the longer cable and…
1 ReplySeptember 17, 2022 at 7:02 am The pic attached is what Cummins came up with to balance or assist the internal workings on the EP9 pump.. Best to take it apart, lube all, figure out how it works and then you can decide where the issue is.. It’s just about always related to linkage rust, an old cable/binding, etc.Ā Ā Nothing scary when working on it.Last Post by:
posted: 1 year ago
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Sensor on Combo Block?
This topic has 1 reply, has 2 voices, and was last updated by
1 year ago September 16, 2022 at 2:21 pm Prepping for my fuel cooler removal and noticed a sensor/sender mounted to the left of my oil pressure sending unit down on the combo block.Ā Has white wires coming out of it.Ā Traced them into a bundle and not sure what this sensor or sending unit is for?Ā 2008 6BTA 330 Remans.Ā Ā Item is circled in red in one of my photos.Ā Thanks.Ā Ā
1 ReplySeptember 17, 2022 at 6:43 am OIL PRESSURE alarm switch–Was Not Cummins supplied..Ā Not sure how it is wired, but usually you have a oil pressure alarm come on before you start the engine (key on) . Once the OP rises to above 8-10 PSI, the alarm goes away.Ā The largerĀ “other one”, is the sender for the oil pressure gauge.Last Post by:
posted: 1 year ago
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6BTA Timing Cover, Oil Pan, and general sealing
This topic has 12 replies, has 2 voices, and was last updated by
1 year ago
April 23, 2022 at 7:53 pm Hi everyone,Ā I’m getting ready to do out of boat maintenance on my 6BTAs and was wondering, what works best based on SBMAR and others experience for sealing components. Area of interest for this post are basically the timing cover and oil pan, and others as may be suggested. I would not like to find an oil pan leak (or any other leaks) after engines are reinstalled. Which is the tested leak proof method for sealing the timing cover and oi…
12 RepliesSeptember 16, 2022 at 11:22 am Hi, Another question within this thread just to keep the topic were it belongs. When sealing the oil pan to the block without the paper gasket and only using Ultra Black RTV: Is there any concern on using rtv around the oil pickup port hole on the pan/to block? Oil pan is the aluminum type (3348911) where the pickup tube bolts to the pan and then the pan bolts and aligns the oil port hole to the block.Ā Thank youLast Post by:
posted: 1 year ago
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Engine Flush Question
This topic has 3 replies, has 3 voices, and was last updated by
1 year ago September 6, 2022 at 5:33 am I now flush my twin QSB6.7 425 units after each run…5-7 minutes each. SB flush caps on the sea strainers. I have noticed that the cool fresh water really cools the heat exchanger and after cooler.Ā Is there any chance this quick swing from hot to cold can stress/damage/crack these components?
3 RepliesSeptember 16, 2022 at 7:16 am I freshwater flush my QSB 5.9 480 after each use. The engine is generally shutdown 20-30 mins before flushing. I cannot see in my mind’s eye why a 30 degree difference in water temp coursing through the SWAC side of the engine could be create a thermal issue. I can’t sleep if I don’t freshwater flush after each use. šLast Post by:
posted: 1 year ago
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Still chasing fuel issue…4bta
This topic has 11 replies, has 5 voices, and was last updated by
1 year ago
September 12, 2022 at 4:13 pm Evening, I have been having a lag in the port engine spooling. Ive done all the low power checks that i am able to. Replaced the lift pump and the return check valve as the pressures were on the lower side. Still having a 40 sec lag of it spooling. Boost pressures are same as the starboard and egt are about the same. Port runs about 916 wot and starboard is 890. The port losses prime when sitting for 48+hrs but cant find it. Attached are the num…
11 RepliesSeptember 15, 2022 at 11:37 pm Or you could blow in the return line, if it bubbles, itās submerged.Last Post by:
posted: 1 year ago
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Reading hours on a QSB w no gauges
This topic has 1 reply, has 2 voices, and was last updated by
1 year ago September 15, 2022 at 9:33 am What scan tool can plug in and read QSB hours with no gauges? Thx
1 ReplySeptember 15, 2022 at 5:01 pm Try google.. You need a scanner compatible with a ISB 5.9 “common rail”Ā in a dodge truck vintage about 2002-2005-ishĀ The typical Truck forum guys have got that down, I’m sure.Last Post by:
posted: 1 year ago
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1st Oil Change QSB 5.9 480 Questions
This topic has 5 replies, has 3 voices, and was last updated by
1 year ago September 11, 2022 at 2:10 pm Questions Is the oil pan front drain plug/magnet removal going to take a considerable amount of oooomph? Think a 1/2″ hand rachet with a 3/8’s male suffice or will I need something more like a short breaker bar? Thanks Bill D
5 RepliesSeptember 15, 2022 at 2:21 pm Thanks for the replies gentlemen ! The QSB 5.9 in my boat has a Wolverine oil pan heater pad plugged in 24/7 when the boat is in the water. The engine also has a factory drain hose on the bottom aft of the oil pan. My engine install is about dead flat level at the dock. Very little oil came out of the front magnet plug as expected.Ā Ā I have used a Jabsco Water puppy with neoprene impeller for years pumping oil. Makes a real quick pump out…Last Post by:
posted: 1 year ago
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QSB 5.9 380 rpm derate
This topic has 4 replies, has 1 voices, and was last updated by
1 year ago
September 4, 2022 at 6:16 pm Used engine new install, SMX digital display, raw water pump, double filters and 6″shower/exhaust. Runs fine up to 1800 then sudden drop to 800 or so. It does not hesitate or stumble like lack of fuel just like a shudder and drop in rpm no smoke. Runs fine up till then sounds normal IMHO. I did notice real quick rise in engine temp as i power up from 172 to 185 before sudden drop and back to 173 at lower rpm. I could only fit a 1 1/2 sea c…
4 RepliesSeptember 15, 2022 at 1:01 pm 4 injectors out of torque causing excessive return IE low pressure after 2500RPM but fine below that. Full RPM and need more wheel!!Last Post by:
posted: 1 year ago
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Operating with bad alternator?
This topic has 3 replies, has 2 voices, and was last updated by
1 year ago
August 19, 2022 at 8:35 am Just went thru a survey for a 2007 Sea Ray 40 Sundancer with Cummins QSB 380 motors. Appears to be no voltage coming from port alternator (readings on gauges). Stayed at 12.8 when initially running, but went down when operating longer during seat trial. (Starboard alternator is charging fine and stayed at about 13.7vdc). Anyway, I need to get the boat south about 50 miles out of the marina it is currently at to my marina. I have the option of re…
3 RepliesSeptember 15, 2022 at 7:38 am Just a quick follow-up on this. Had to connect both battery banks together to get the boat home in order to inspect/troubleshoot. Did not want to run with battery charger. Turned out the sense/excite wire was sitting in the plug on that alternator but was broke. Casual observation during the survey would not show a broken wire. A new connector fixed that issue. No rebuild or new alternator needed. Just wanted to close this out.Last Post by:
posted: 1 year ago
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CPL 1613 & CPL 1928
This topic has 5 replies, has 2 voices, and was last updated by
1 year ago September 11, 2022 at 1:35 am Hello guys I am rely hoping for someone to shed some light on this issue. I am in the process of rebuilding my cummins 6bta 5.9 M2 engines and since I need to get the correct parts I would like to ask the difference in CPL 1613 and CPL 1928. Would I be correct in understanding that CPL 1613 is referring to an engine with 250 Hp while CPL 1928 is referring to 315 Hp? My engines were uprated from 250 Hp to 315 Hp by changing the injectors and re-c…
5 RepliesSeptember 13, 2022 at 4:48 am If the parts are available, we’ll get it sorted out. If you have sleeve damage,Ā you maybe be looking at a complete genuine Cummins long block..Last Post by:
posted: 1 year ago
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Upon impeller implosion, elbow temp got to 250f
This topic has 1 reply, has 2 voices, and was last updated by
1 year ago September 12, 2022 at 11:50 am 210 6BT, impeller failed and I noticed 210f on the engine temp gauge, checked temp at the mixing elbow and it was 250f. Not sure if big exhaust hose got damaged getting that high? Engine runs fine and all temps are good, upon new super 71 impeller installation. Not sure if I should be replacing the exhaust hose as well, its like 5 or 6in diameter and about 6ft long. Thanks for the advice
1 ReplySeptember 12, 2022 at 12:54 pm If silicon the hose would be fine but if EPDM rubber it would be worth removing for inspection as I have seen them range anywhere from 200F to 280F max temp….Last Post by:
posted: 1 year ago
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2002 6BT Running rough ,white smoke too
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