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- Cummins Marine Forum Topics
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Zero oil pressure on 6BTA
This topic has 2 replies, has 2 voices, and was last updated by
14 hours ago
May 5, 2024 at 7:02 am I have a Meridian 408 with 6BTA Diamond Series engines (2004 year model). When I pulled into my slip six weeks ago, I had 20 PSI of oil pressure on my starboard engine at idle before I shut it down (I always keep records). When I started the engine for the first time yesterday, the gauge showed zero oil pressure and the alarm continued to sound so I shut it down. Since the oil pressure gauge and the alarm are on two separate senders, I have to a…
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in: Cummins Marine Engines
2 RepliesMay 5, 2024 at 1:36 pm I installed a mechanical tach. Verified that there is no oil pressure. The needle did not wiggle, and no oil entered the pressure tube. Someone suggested that the oil pump drive could have sheared, is that som000ething that happens? I’ve never heard of that. Any suggestions welcomed. Thanks, Martin0Last Post by:
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Cummins 6CTA engines down on speed
This topic has 2 replies, has 3 voices, and was last updated by
21 hours ago May 3, 2024 at 9:03 pm Hi All i have a Carver 530 Flybridge with a pair of Cummins 6CTA engines that have been totally rebuilt .. I was seeing speeds of 21 knots at full throttle with vertualy full fuel tanks and a clean bottom… Took the boat out last week and with 1/4 fuel in both tanks and still clean bottom i am only seeing max speed of 15.8 knots at 2300RPMs… Carver state boat should max RPMs at 2650and top speed should see 24.1 knots.. So what am i mi…
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in: Cummins Marine Engines
2 RepliesMay 5, 2024 at 6:12 am Have you compared speed at a given rpm now vs then? This might seem like semantics to you but to say you are down on speed is wrong, that would suggest you are making rpms but lost a few knots.Ā What you have is a power/rpms issue: Understanding Low Power TroubleshootingLast Post by:
posted: 21 hours ago
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Impeller puller for Sherwood 1730 raw water pump
This topic has 3 replies, has 3 voices, and was last updated by
2 days ago May 1, 2024 at 7:01 am Does anyone have experience with an impeller puller tool that works with a Sherwood 1730 raw water pump?. this is on a 6BTA engine. Amazon has one from Jabsco but I would like to know if it (or some o0ther tool) would work. Thanks
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in: Cummins Marine Engines
3 RepliesMay 3, 2024 at 9:04 am The more you destroy it the easier it will be to get it out.Ā Did you spray lots of lube between the vanes and then some bumping of the engine?Last Post by:
posted: 2 days ago
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Alarm at ignition key
This topic has 1 reply, has 2 voices, and was last updated by
2 days ago May 3, 2024 at 8:24 am 1998 4788 Bayliner running twin 330 Cummins 6BTA 5.9M2 Running along yesterday and alarm on Port side suddenly went off.Ā Oil pressure was fine, temps were fine. This is the alarm that sounds loudly while starting the engines and shuts off once engine is started oil pressure is present. I ended up disconnecting the alarm both at the pilot house and fly bridge helms because it was driving me crazy.Ā Ā Any ideas what might be causing this.Ā I shut …
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in: Instrumentation & Electronics
1 ReplyMay 3, 2024 at 8:46 am Bayliner is one of the builders that did not go OEM when it came to implementing the boat’s engine instrumentation so you’re dealing with boat builder stuff.Ā Is the alarm system one that tells you what parameter is the trigger (oil psi, coolant temp, etc) Is there a circuit board in the system like the OEM Cummins from that vintage or did Bayliner go with alarms integrated in each instrument (gauge reading triggers alarm) or a dedic…Last Post by:
posted: 2 days ago
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6CTA – Turbo Dripping Oil
This topic has 4 replies, has 4 voices, and was last updated by
4 days ago
April 26, 2024 at 7:08 am First time I noticed this was after putting the boat back in the water yesterday and going for a long ride to test temps out after servicing the Aftercoolers per Tony’s method. Ā There was oil ontop of the transmission which seems to be coming from the Turbo. The oil is clean and looks new so it must be from my recent oil change which is why I believe this is a new thing that happened yesterday.Ā Ā Ā
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in: Cummins Marine Engines
4 RepliesMay 1, 2024 at 1:00 pm Those are some ugly pictures!Ā Lots of saltwater around the intake while underway (looks like even the air filter is covered in rust?!) and the color of the paint on the turbo intake side also speaks volumes.Last Post by:
posted: 4 days ago
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Smx 27 Impeller Install
This topic has 8 replies, has 7 voices, and was last updated by
6 days ago
April 23, 2024 at 10:34 am I’m trying to install a new SMX 27 impeller in my SMX 1730 pump. First time replacing it. Impeller won’t go in all theĀ way. I think it’s getting stuck on something orĀ ot fitting on spline. Tried two different new ones. Any advice or experiences.Ā Thanks
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in: Cummins Marine Engines
8 RepliesApril 29, 2024 at 11:47 am Google impeller tool. I have the same pumps, takes 5 minutes to install the new impeller.ĀLast Post by:
posted: 6 days ago
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6CTA Aftercooler Removal and Service Issues
This topic has 16 replies, has 7 voices, and was last updated by
1 week ago
April 18, 2022 at 8:11 am After the thorough information and write-ups from Tony and the SBMar team, and the readily available parts kits they supply, I decided to tackle my aftercoolers this year. This is my second year with this vessel, a 2001 Tiara 3800 Open with 6CTAās, roughly 500 hours. It was previously serviced by Gorham Diesel out of the Boston area. The aftercoolers were replaced with brand new ones 4 years ago, so I am assuming that this is the first āserviceā…
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16 RepliesApril 28, 2024 at 3:02 pm That starboard core looks like crap but maybe try pressure testing it after cleaning it incase it still holds pressure? Ā I dont have the SMX housing (does one exist?), but I do have the SMX core on my Port Side with the original housing and no issues, pressure test passed. My 2nd year with it btw, previous owner didnt do the bench and when I went to do the bench I found corrosion and a failed pressure testĀLast Post by:
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6cta Motor Mounts – How to test?
This topic has 9 replies, has 3 voices, and was last updated by
1 week ago April 4, 2024 at 5:15 pm Purchased this 2001 Tiara 3800 with 6CTAs 4 years ago, these were the mounts on the vessel, not sure how far they date back but I am starting to wonder if they are good or not, the left motor seems to vibrate alot more than it used to under way.Ā Ā Ā Ive been reading some threads about alignment as well, anything obvious to look at or photograph to be able to tell? The props were fixed at my inspection survey, and I have not hit anything that I a…
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9 RepliesApril 27, 2024 at 5:00 am Could be prop(s) related.Ā When she was on the hard I would have pulled the wheels and had them scanned.Last Post by:
posted: 1 week ago
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480ce dropped valve seat TSB 2006
This topic has 3 replies, has 3 voices, and was last updated by
1 week ago April 26, 2024 at 10:28 am Does anybody have a copy of the Technical service bulletin that came out in 2006 adressing the problem with the dropped valve seat?Ā
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in: Cummins Marine Engines
3 RepliesApril 27, 2024 at 4:50 am Your attachment is good … remember with PDF attachments click on the red text filename, not the thumbnail image.Last Post by:
posted: 1 week ago
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6BTA 370 Vibration in Tensioner
This topic has 6 replies, has 2 voices, and was last updated by
1 week ago April 18, 2024 at 9:46 pm Hi, I just completed a complete cleaning of a rusty coolant system, rebuilt the turbos while at it, and a lot of other stuff.Ā I noticed when running again near idle one of the tensioners is vibrating visibly (maybe 1/4″).Ā This engine also has more vibration visible on it from the coolant reservoir for example.Ā Ā I replaced the tensioner and idler (not upgraded idler, next time) last year (50 hrs since) with OEM parts and so not sure what…
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in: Cummins Marine Engines
6 RepliesApril 23, 2024 at 6:42 pm Could of been load on alternator.ĀLast Post by:
posted: 1 week ago
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Turbo oil darin elbow leak
This topic has 1 reply, has 2 voices, and was last updated by
1 week ago April 22, 2024 at 8:44 am Brought a replacement turbo oil drain elbow last year to replace a leaking pitted one.Ā Came with two gaskets. Mechanic used just one on the re install and said second was just an extra.Ā Well it was then leaking from the fitting face and the turbo. Pulled fitting and replaced gasket once again and it still leaks same area of the marriage between the fitting face and the turbo.Ā Should we have used both gaskets?
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in: General Discussion
1 ReplyApril 23, 2024 at 1:30 pm Post some pics of what you’re dealing with.Last Post by:
posted: 1 week ago
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Elbow Cost
This topic has 3 replies, has 3 voices, and was last updated by
1 week ago April 22, 2024 at 10:55 am I have Cummins 6BT 370 Diesel engines. My boathyard says one of my elbows shows evidence of water intrusion.Ā They quoted $3500 for a replacement.Ā Is this accurate? Ā Thank you!
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in: Cummins Marine Engines
3 RepliesApril 23, 2024 at 1:29 pm Would like to see the geometry of the exhaust when it’s all together.Ā Have any pictures before it was taken apart.Ā Engine room and turbo/exhaust pics?Last Post by:
posted: 1 week ago
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6CTA Starboard Aftercooler Recommendation
This topic has 12 replies, has 5 voices, and was last updated by
2 weeks ago
March 19, 2024 at 11:10 am Good morning SBA team,Ā I pulled the starboard aftercooler for maintenance and discovered some corrosion. I have a pair of 2002 6CTA 450’s which were last serviced in 2019 and installed fresh water strainer caps at the same time. I was surprised at the amount of salt build up, I religiously flush the engines after every use except when cruising multiple days which is onlyĀ about 10-12 days a year. There was quite the buildup in the hose ex…
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in: General Discussion
12 RepliesApril 17, 2024 at 1:47 pm I finally got around to putting it all back together. I bypassed the fuel cooler and remounted the aftercooler. I started a fresh water flush as I normally do with the sea cock open.Ā After ~10 minutes I shut it down and pulled the lower zinc and did my taste test. It definitely was salty water as I expected, not pure salt water but still a bit salty. Based on this experience I will now start closing the sea cock during the flush. We have great …Last Post by:
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2010 QSB 5.9 355hps in Tiara 3200 – any input appreciated
This topic has 8 replies, has 4 voices, and was last updated by
2 weeks ago
April 16, 2024 at 1:01 pm Hello Diesel Experts! First time poster. Would greatly appreciate any insights, observations, or other feedback. Thank you so much for this resource and your time. Will try to keep this brief (ugh I see itās not though). Under contract on a 2010 Tiara 3200 with original Cummins QSB 5.9 355HPs ~800hrs. I am in love, but not married yet, and def trying to get a hard peek behind the kimono first. Iām brand new to diesel motors and inboards but have…
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in: Cummins Marine Engines
8 RepliesApril 17, 2024 at 12:42 pm Turge’ We have a 2007 32 Open with the 355 Cummins.Ā They have around 1200 hrs now.Ā Max rpm’s for ours is 2850 / 2860 full fuel and H20.Ā The Garmin shows 32 kts at max.Ā Our “fast” cruise (when possible) is 2400rpms, giving around 24 kts and 24 gph.Ā The numbers have not changed at all from beginning to end of a New England season, or the five years we have had this boat.Ā Our aftercoolers / HE are on a three year sched…Last Post by:
posted: 2 weeks ago
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Where are drain plugs/cocks located to empty QSB 5,9 for coolant/anti-freze
This topic has 5 replies, has 3 voices, and was last updated by
2 weeks ago April 2, 2024 at 1:46 am Trying ot source proper drawings on where the drain plugs etc are located in order to change the cooling fluid on my engine.
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in: Cummins Marine Engines
5 RepliesApril 16, 2024 at 6:26 pm To access a PDF attachment you need to click on the red text pdf filename, not the thumbnail image.Last Post by:
posted: 2 weeks ago
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Motor mounts
This topic has 3 replies, has 2 voices, and was last updated by
2 weeks ago April 15, 2024 at 7:19 am Can anyone help identify this motor mount ? It supports a QSC 8.3.Ā
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in: Cummins Marine Engines
3 RepliesApril 16, 2024 at 11:26 am Do a Google search for Metalastik CushyfloatLast Post by:
posted: 2 weeks ago
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Alternator for 6BTA 370HP
This topic has 5 replies, has 3 voices, and was last updated by
3 weeks ago April 13, 2024 at 2:28 pm My alternator has stopped putting out power.Ā I want to replace it with essentially the same alternator and would like help confirm my selection.Ā My cummins has 5,100 hours and is 2001 vintage.Ā After 23 years, this alternator appears to have done its job! Ā Here are photos.Ā Ā Ā The Tag looks to read Delco Remy 12V 105 Amp made for Cummins.Ā It is a 12V, 3-wire alternator putting out 105 amps. Yes – i have cleaned up the 3-Wire Harness, a…
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in: Cummins Marine Engines
5 RepliesApril 14, 2024 at 1:05 pm Rob had them rebuilt at a 1st class shop & they could easily be “better than new”…..Ā IMO,Ā Ā well worth the extra effort.Last Post by:
posted: 3 weeks ago
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What is this sender for?
This topic has 3 replies, has 3 voices, and was last updated by
3 weeks ago April 13, 2024 at 9:59 pm What does this sender sense and where does the signal go?Ā I can read the word “sender” on the unit but the rest is faded and smudged. I’m attaching a stock photo with the sender circled and also a photo of the one installed on my engines. Thanks! Kyle
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in: Cummins Marine Engines
3 RepliesApril 14, 2024 at 7:36 am Thanks for the quick reply!Last Post by:
posted: 3 weeks ago
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6BTA 370HP losing coolant with heavy white exhaust
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This topic has 21 replies, has 5 voices, and was last updated by
3 weeks ago March 19, 2024 at 4:13 pm Two mornings ago as I was performing my pre-run checks, I noticed the coolant overflow reservoir on my STBD main engine (SN:46174828) was empty.Ā I checked the main reservoir and it was completely filled.Ā So I started looking for external leaks but could find no evidence of an external leak anywhere. I turned to looking for internal leaks and checked the oil and transmission fluid but neither had any abnormal level or visual indication o…
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in: Cummins Marine Engines
April 14, 2024 at 5:56 am Way to go.Ā You took your punches but kept at it.Ā Nothing beats a successful DIY battle.Ā Thanks for keeping this updated.
21 Replies
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posted: 3 weeks ago
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Heat exchanger raw water outlet
This topic has 2 replies, has 3 voices, and was last updated by
1 month ago
March 8, 2024 at 9:26 am Hi all , Iām in the process of redesigning my exhaust system to get it higher above the water line. Is there any way to change the raw water outlet on the heat exchanger? Thanks
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in: General Discussion
2 RepliesApril 4, 2024 at 9:48 pm I would also like to change the raw water outlet of my Sen-Dure heat exchanger on Cummins 6BT to a straightĀ output instead of the elbow for better clearance around the riser.Ā Ā Can you recommend a shop that could do the change over from the elbow to a straight outlet?Ā Ā I think the heat exchanger is a copper-nickel alloy and may be problematic to weld/braze. Thanks.Last Post by:
posted: 1 month ago
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Zero oil pressure on 6BTA
