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- Cummins Marine Forum Topics
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Where’s the 3rd bolt?
This topic has 4 replies, has 4 voices, and was last updated by
4 months ago
October 30, 2023 at 3:54 pm Hi I am trying to replace my starter. I got the 2 bolts off but there has to be a 3rd as it won’t budge. Any tips on how to locate and remove the 3rd bolt? Thx-Lew 6BTA330m
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in: General Discussion
4 RepliesJanuary 3, 2024 at 7:11 pm Nope, you are right, no 4 th bolt.Ā Ā Ā Memory is not good.Last Post by:
posted: 4 months ago
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Perplexed! Performance/Propping my 6CTA’s
This topic has 10 replies, has 6 voices, and was last updated by
6 months ago
November 7, 2023 at 10:12 am Hey guys, I purchased my Formula 41PC with twin 6CTA’s a little over 2 years ago now and I have been absolutely struggling to get my RPM’s and props dialed in. The boat had a set of 5 blade’s on her that were only reaching 2400 RPM’s and after reading all of Tony’s Tips related to propping and revs I knew this was nowhere even close. My spare set of Michigan 4 blades got me a bit closer at 2500 rpms and after giving…
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in: General Discussion
10 RepliesNovember 10, 2023 at 4:03 am From this site, boost port: https://www.sbmar.com/articles/boost-fitting-locations-for-b-c-series-marine-diesels/ I see 28 to 31 PSI on our boost gauges (6CTA8.3-M3)Last Post by:
posted: 6 months ago
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6cta 8.3 Idle Adjustment
This topic has 2 replies, has 2 voices, and was last updated by
10 months ago July 17, 2023 at 8:36 am Hope everyone is having a great summer. I have 97 Carver 500 with pair of 6ctaās and the port engine is idling 150-170 above the starboard.Ā starboard at start up with run between 610-630rpm but the port is idling 715-740 which is making a hard shift for the trans.Ā when I turn the synchronization on it will idle down since the port is in āslaveā and the starboard is actually running them both.Ā is there an adjustment on the engine? Ā Ā
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in: General Discussion
2 RepliesJuly 18, 2023 at 4:50 am I will check that first thing.ĀLast Post by:
posted: 10 months ago
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6BTA Turbo Oil feed line
This topic has 5 replies, has 4 voices, and was last updated by
June 26, 2023 at 8:54 am Just had my turbos rebuilt and had to replace the oil feed line, not sure what kind of stuff Cummins put on the flared fitting into the adapter but it was never coming off so I had to cut them.Ā I understand I need to manually put oil in the turbo before firing up.Ā Two questions, how much oil should I put in there, and do I need to prime the oil feed line before firing up?Ā I realize oil pressure builds quickly but just want to be sure I don…
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in: Cummins Marine Engines
5 RepliesJune 28, 2023 at 4:07 am To follow up on Richards post, while it works…. When I purchased a rebuilt turbo, the instructions called for adding a few oz’s of oil to the top of the turbo before starting.Last Post by:
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ZF301-AāWhere do I put the new oil?
This topic has 5 replies, has 3 voices, and was last updated by
10 months ago June 20, 2023 at 5:49 pm I am changing the transmission fluid/oil in my ZF 301A transmissions and have a couple of questions: * Where do I put in the new oil (dipstick)? Ā Donāt believe there is a filler cap on this ZF transmission. * Am I able to remove all of the oil via the dipstick or do I need to remove the oil drain plug?Ā Ā ThanksAdam
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in: Marine Transmissions
5 RepliesJune 25, 2023 at 2:11 pm Yes you can suck it out that way, but even easier may beĀ to putĀ the oil pressure line that exits the pump into an appropriate container and start the engine.. The oil will all pump out until the pump sucks the transmissiom sump dry or sucks air and looses prime.. No ISSUE doing this ..Last Post by:
posted: 10 months ago
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Starboard engine will not start
This topic has 3 replies, has 4 voices, and was last updated by
June 8, 2023 at 8:04 am We have Cummins BTA 5.9 engines in our Carver.Ā We have been having to jiggle the throttle in neutral to get the starboard engine started.Ā After doing some maintenance, the starboard engine does not start.Ā No buzzer or attempt to start.Ā We have 13.5 V from the battery on the positive pole of the slave solenoid and when testing the smaller poles and turning the ignition key there is no voltage.Ā At the helm, the ignition switch has voltage at …
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in: Cummins Marine Engines
3 RepliesJune 9, 2023 at 2:54 am From this web site is part of the wiring harness. On our Carver, Carver took the Yellow/Red wire from the Cummins harness (Pin 3 on the 8 pin connector) and ran it through the neutral switch.Ā (each engine has it’s own harness) Our Carver is now 30 years old, just had a similar issue, neutral switch (in gear shift on bridge) needed to be changed. You should see the 8 pin connector under your dash. Pin 1 on the connector is the ground.Ā It …Last Post by:
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Fusing starting Battery
This topic has 9 replies, has 6 voices, and was last updated by
11 months ago
May 23, 2023 at 6:09 am Redoing my starting circuit and was wondering if anyone is installing fuses on the starting batteries. I am switching from 1 4d battery that was used to start both motors to 2 group 31 deka agm batteries with 2/0 awgĀ for both grounds and positives.Ā Ā Should have said this earlier this is for 2 Cummins 6bta 370hp motors.Ā If a fuse is recommended what size?Ā From what I read it is recommended to fuse the circuit with the max wire amps wh…
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in: Cummins Marine Engines
9 RepliesMay 31, 2023 at 6:23 am After reading the comments and doing a little more research I plan to either use an ANL fuse or like Tont stated an on off switch that is easily accessible in case of an issue.ĀLast Post by:
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Single engine use
This topic has 6 replies, has 3 voices, and was last updated by
11 months ago
May 21, 2023 at 2:07 am Hi there, as a newbie in this forum I’d like to start my first question. My Meridian 2004 408 is equipped with two 6bta5.9 370hp engines. Sometimes – in the harbour and locks, even some dutch canals – it’s too much using both engines. May I use only one engine? Is this damaging the engines or the seals/ shafts? Regards Werner
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in: Marine Transmissions
6 RepliesMay 24, 2023 at 9:20 pm I have no idea what gear the boat is equipped with. Next time aboard I will Check it. Thanks by now.ĀLast Post by:
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pre servicing
This topic has 2 replies, has 3 voices, and was last updated by
April 20, 2023 at 10:07 am what the term pre servicing means?
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in: General Discussion
2 RepliesApril 21, 2023 at 6:35 am Perhaps the context it is used would help the forum help you.Last Post by:
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Hard Start
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This topic has 25 replies, has 5 voices, and was last updated by
1 year ago
January 24, 2023 at 3:25 pm Hi all, I was here last year with a rattle in my Cummins Starboard motor and with a great deal of help from here that problem was solved. 1999 Diamond C Series Loud Rattle – Cummins Marine Forum (sbmar.com) I only have one issue now and that is that when one of the mechanics was aboard he suggested that the rattle was the valves and of course it wasnt but I let him adjust them and since that day it has been harder to start than the Port mo…
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in: Cummins Marine Engines
April 10, 2023 at 4:50 pm Hi guys, I have just tried priming the fuel button after leaving it for a few days. I have been re-reading the posts and wanted to see if it would now take more pumps to prime and return fuel to the tank and it literally took the one press and it returned fuel. Sorry to keep on here but I am learning all this as we go. Thanks Guys, Doug.
25 Replies
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6 CTA Aftercooler housing repair while I wait for a new one…
This topic has 13 replies, has 7 voices, and was last updated by
1 year ago March 29, 2023 at 5:30 pm Took my aftercooler in for testing at Niemic my local Cummins dealer and the core bundle had pinholes and there is pitting in the housing right up to the oring seals. Bought the boat last year, it and the engine are 1998, so time for a new one. Niemic tells me these are out 100 days. So I called Seaboard and the helpful parts guy told me they have the core, but similar bad news on the housing. He also told me that Seaboard is working on its own …
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in: Cummins Marine Engines
13 RepliesApril 8, 2023 at 3:14 am I have used an Italian product called Belzona 1391T for such an issue before with good results.Ā The trick is to blast and clean the surface and have all oils and grease gone.Ā Apply a thin coat with a fine wide artist’s camel hair brush.Ā On curved surfaces like the inside of the AC I like to use something like a piece of the wall from a 4 inch PVC pipe with stick-on PSA sand paper (various grits) to finish it down. The curved backing hel…Last Post by:
posted: 1 year ago
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Paint or Not Paint
This topic has 2 replies, has 3 voices, and was last updated by
1 year ago February 24, 2023 at 4:21 am Installed a SMX raw water pump and a new after cooler. Do I leave them as they came or paint them? Thanks, Bill
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in: Cummins Marine Engines
2 RepliesFebruary 24, 2023 at 1:07 pm No right or wrong answer here.Ā It’s personal preference.Ā If unpainted keep them sprayed with your corrosion protection product of choice.Last Post by:
posted: 1 year ago
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No power at key switch after servicing and reinstalling aftercooler
This topic has 1 reply, has 2 voices, and was last updated by
February 23, 2023 at 5:10 pm I recently removed, serviced and reinstalled one of my after coolers, I removed Ā the other one, but have not installed it back yet. Ā During re-installation something touched and sparked twice while trying to fit the aftercooler back in place once reinstalled I went to try to crank the engines, but no power at the key switch. Could I have possibly touch some wires and blown a fuse somewhere and if so, does anyone know where that fuse could be ? Ā …
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in: Cummins Marine Engines
1 ReplyFebruary 24, 2023 at 6:05 am I think my 6CTA8.3 is very similar, if that is correct: On the left side rear of the engine is a 8 pin connector. On the engine side of the connector is a 10 amp fuse or circuit breaker (red wire from 8 pin connector) On my boat the fuse is right behind the bottom ofĀ the after cooler. Ā Also, on my boat, there is a 10 amp circuit breaker near the key switch at the helm. Obviously you have an issue with pinched or cut wires that must be found an…Last Post by:
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6 CTA 8.3 M3 start battery
This topic has 3 replies, has 3 voices, and was last updated by
1 year ago
November 3, 2022 at 11:52 am I have a 1998 6 CTA 430HP with a recently rebuilt Bosch starter. It starts fine now. Boat has TWO AGM 8D start batteries, new, rated at 1450 cold cranking amps each. I am trying to find what the spec is and what the best practice is for start battery capacity. Elsewhere on this forum someone mentioned 1225 CCA was adequate, but I did not see any reference or documentation. I have never had an engine this large and never needed more than one star…
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3 RepliesNovember 4, 2022 at 10:10 am Great, thank you for the replies here.Last Post by:
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From the looks of it….
This topic has 11 replies, has 4 voices, and was last updated by
1 year ago
October 27, 2022 at 2:35 pm Hello all, I am new here. As a boat buyer, I”m about to conduct an overall survey of these 6BTA 330’s. I plan to start with a blow-by (provided it’s safe to do so).Ā As you can see in the pictures, neglect is probably an understatement and the spray paint on the hoses prove it. There is something hiding in there. I would like to ask you if you could notice the rear motor mounts being replaced by utilizing the gearbox as a mount…
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in: Cummins Marine Engines
11 RepliesNovember 2, 2022 at 9:41 am Thank you Tony, note taken.ĀLast Post by:
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Rag went through the engine
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This topic has 23 replies, has 9 voices, and was last updated by
1 year ago
September 9, 2022 at 6:10 am Hi All,Ā Ā Boat is a ’99 Searay 450 express bridge with twin 6CTA’s with 2,400 hours. They are v-drives. Due to shaft alignment issues, I bought 8 new motor mounts from SBMar and paid a mechanic to install them.Ā In that process, the SW pumps had to be removed.Ā On the strb side, SW pump is outboard.Ā The motor mount under the SW pumps had to be cut out, so SW pump was removed.Ā They shoved a rag in the SW pump hole to keep debris fro…
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in: Cummins Marine Engines
October 10, 2022 at 8:16 am Dan, I did, and that hose is less than a year old.Ā Then I disconnected both intake hoses from the pump, then opened both engine’s seacocks to check water flow into the boat.Ā Both were equal.Ā Also, obviously I cleaned out the sea strainer and through hull. However, I am thinking about replacing that intake hose.Ā As mentioned above, they had to used grinders to remove the motor mounts.Ā I’m wondering is some of the hot sparks from … 23 Replies
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Installing battery switch
This topic has 1 reply, has 2 voices, and was last updated by
June 21, 2022 at 8:30 am I have 2 8D batteries in the boat. There isnāt a battery switch. I am going to put one in. Recently replaced red starter cable and red alternator cable. Both are 2/0 tinned with heat-shrinked connections. Ā The cables I replaced Ā were 1/0 SAE , taped ends of the wrong size. Each of them had at least a few spots with wire showing.Ā <br />On a typical install, this will be my 1st, what tips can help ?
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in: Cummins Marine Engines
1 ReplyJune 22, 2022 at 4:45 am What is the distance cables run to starter and ground to engine. I would recommend 4/0 wire size. Also ensure new switch can handle the load.Ā Ā My 6CTA8.3 draw about 650 amps at start (with grid heaters on) Hope this helpsLast Post by:
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Kirkland Oil
This topic has 2 replies, has 3 voices, and was last updated by
2 years ago March 16, 2022 at 10:21 pm Hi guys thanks for the great site. Iām a relatively new boat owner. Last summer we purchased a 1995 Albin 28 TE, itās got a Cummins 6bta 250 horsepower. Iāve got a long list of maintenance items and upgrades. I wanted to know if Kirkland diesel oil met the Cummins requirements? I was unable to tell by looking at the box. If not I can return it so not a huge deal. Would that be the best route or is there another oil I should use instead? Thanks a…
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in: Cummins Marine Engines
2 RepliesMarch 17, 2022 at 6:07 am The API spec in right on the label… Should be fineLast Post by:
posted: 2 years ago
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CAT C-12 ACERT RE-MAN OIL ANALYSIS
This topic has 12 replies, has 3 voices, and was last updated by
2 years ago
December 29, 2021 at 5:44 am Installed one year ago on a 38 Wesmac bridge Downeaster. Multiple issues with control panels, shut off switches, the ECM module (replaced twice) – all covered under warranty but a lot of downtime. Charter boat, Ā 800 hours, always ran boat 60% +/- load, probably 500 of these hours drifting, 600-700 rpmās. Current issue – aft starboard oil leak, plus HIGH metal content via most recent oil analysis. CAT has not yet looked at oil leak, a…
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in: All Other Marine Diesels
12 RepliesJanuary 2, 2022 at 8:29 pm Yes, in their hands really, one person versus large corporation. You have given me more data to fight the fight, āwhy did you ok the engine when it didnāt meet your guidelines etcā. Even with replacement engine, still have that base design, so still need to pitch down and baby her, which I think I do anyways. Long odds to get replacement, but if they give me 4 more years warranty at least that covers repair costs, but not downtime. Iāll keep doc…Last Post by:
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6cta not starting & wire burning
This topic has 12 replies, has 5 voices, and was last updated by
2 years ago
December 26, 2021 at 7:52 pm i am having issues with one of my 6cta engines, when i try to start the engine sometimes it doesnt start and the positive wire in the bendix gets really bot that it starts to burn through the insulation… It feels like there is a big short somewhere… What could be causing this? maybe a bad bendix or starter? i did change the magnetic switch but that didnt do anything…
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in: Cummins Marine Engines
12 RepliesDecember 30, 2021 at 7:44 am Your problem has nothing to do with the number of banks.Ā There have been countless arrangements of battery banks for boats, all have their pros & cons.Ā Two banks where one bank starts the engines and the other handles the house loads and where there are provisions for combining both banks and isolating a bad bank for emergencies is the best compromise for most installs IMO.Ā Leave that alone and remove your starter & get it tested.Last Post by:
posted: 2 years ago
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Where’s the 3rd bolt?
