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Failed after cooler core
This topic has 2 replies, has 2 voices, and was last updated by
11 months ago
May 26, 2023 at 10:00 am Twin QSB 5.9, 380 hp.Ā I ran my boat down the east coast to Florida.Ā Near the end of the trip, the starboard engine exhaust showed black smoke above 1800 rpm.Ā Assuming it was a rich condition, I cleaned and replaced the air sep filter and oil separator filter, drain and piping, checked the turbo etc. no improvement.Ā I finally pulled the after cooler and removed the core to find this mess (see pic). The core was destroyed and possibly, probabl…
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in: Cummins Marine Engines
2 RepliesMay 26, 2023 at 11:10 am Tony first off, thanks a for responding, and doing so, so quickly.Ā And yes, from the looks of the aftercooler core, this has been going on for a long time. The boat is a 2005.Ā I bought it in 2017 and had the after coolers serviced at purchase by Cape Cod Marine (a certified Cummins shop).Ā I saw the service work in process, disassembled, cleaned, plenty of the recommended grease.Ā Around three years ago, I serviced them myself using the same p…Last Post by:
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Twin 5.9 QSBs w smart craft – low voltage at key switch
This topic has 1 reply, has 1 voices, and was last updated by
1 year ago February 6, 2023 at 8:52 am I Ā have Ā 11 volts at port key switch in off position and 2 volts in on position. Ā Ā I have 13 Ā Volts from the battery all the way to the main station Ā extension Ā harness. When I turn n key switch voltages drops to 2 volts. Disconnecting main station extension harness from the junction box increases voltage at key switch to 13.
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1 ReplyFebruary 13, 2023 at 10:21 am I have 11 volts at port key switch in off position and 2 volts in on position. I have 13 Volts from the battery all the way to the main station extension harness. Where are you measuring this? When I turn n key switch voltages drops to 2 volts. Disconnecting main station extension harness from the junction box increases voltage at key switch to 13. If you disconnect the extension harness, you should have NO voltage at the KEY, this tells me that…Last Post by:
posted: 1 year ago
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QSB exhaust elbow insulation replacements
This topic has 3 replies, has 2 voices, and was last updated by
3 years ago April 29, 2021 at 10:54 am Does anyone have a recommendation for sourcing replacement insulation for the exhaust elbows. I don’t see them on the Seaboard site.
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3 RepliesMay 2, 2021 at 4:45 am Dave, You need to stand back 2-3 ft and post of pictures of the entire riser and the connection to the hose.. Maybe a few angles & perspectives…… What you have is 100% custom, and from the looks of the exhaust flange where it is attached to the turbo, I think you may have some other serious issues going on.. Best to REMOVE the insulation before you post better pictures..Last Post by:
posted: 3 years ago
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QSB 5.9 carbon/soot on rockers
This topic has 1 reply, has 2 voices, and was last updated by
3 years ago May 19, 2020 at 5:20 am I have twin QSB 5.9s. I removed the valve covers and inspected the rocker assemblies. The starboard engine was clean. The port engine rockers had a film of soot/carbon (easy to see on the red and yellow injector wiring). Any ideas why this would be the case? I am replacing all the Airsep filters as a precaution. Dave
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1 ReplyMay 19, 2020 at 5:47 am Change oil makes & be sure it meets Cummins specs, use genuine Cummins oil filters, and be sure you don’t extend oil change intervals.Last Post by:
posted: 3 years ago
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QSB 5.9 Oil Analysis
This topic has 5 replies, has 3 voices, and was last updated by
January 2, 2020 at 9:33 am I have a boat with twin QSB 5.9s. They are vintage 2004 and I have 1,100 hours on both. I have owned the boat for four years and have done oil analysis for the last two years. The results of both analysis show high aluminum (~100 ppm) content. The engines run very well, seem to match design numbers for rpm, fuel consumption, etc. and generate no apparent smoke. Any one know if there is an issues with these engines or any other possible expl…
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5 RepliesJanuary 4, 2020 at 5:11 am Tony, Thanks for the information, now I understand. I want to add: you and the team at Seaboard are astounding, I’ve never encountered folks with so much marine diesel knowledge. Thanks! DaveLast Post by:
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QSB 5.9/Smart Craft scanner
This topic has 1 reply, has 2 voices, and was last updated by
5 years ago April 3, 2019 at 12:33 pm I have two 5.9 Cummins 2004 with 9 pin “round” data ports. Can I buy a 9 pin to 16 pin OBDII adapter and read codes on these engines? Thanks!
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1 ReplyApril 6, 2019 at 10:24 am I would guess Ebay would have stuff like that. What exact instruments do you have?? If those “round” Mercury Outboard Smatcraft” things, you are driving totally blind.– Any modern digital panel that reads your CM850 J-1939 output will do that plus you won’t be driving with blinders on… TonyLast Post by:
posted: 5 years ago
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QSB 5.9/Smart Craft scanner
This topic has 1 reply, has 2 voices, and was last updated by
5 years ago March 28, 2019 at 5:40 am I have two 5.9 Cummins QSB’s 2004 w Smart Craft instruments. Can I use an OBDII scanner if I get a 9 pin to 16 pin adapter to scan codes for these engines?
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1 ReplyApril 1, 2019 at 8:04 am The 9-pin diagnostic connector only has 4 pins, 2 for power and 2 for J1939 data. Your reader must be able to interpret J1939 DM1-based fault codes.Last Post by:
posted: 5 years ago
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Failed after cooler core
