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4BTA fuel pressure
This topic has 1 reply, has 2 voices, and was last updated by
9 months ago June 1, 2023 at 4:19 am Waiting on some fittings to test this -what fuel pressure readingās should I be seeing at the output side of the on engine fuel filter housing on a 2006 4BTA 250HP? WOT in neutral? WOT under load? Idle? Thanks
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in: Cummins Marine Engines
1 ReplyJuly 16, 2023 at 2:50 am Fuel PSI reading are usually bouncy, but 10-25PSI would seem about right to me for this fuel system design.. If you took readings, fill us in with what you saw.Last Post by:
posted: 9 months ago
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4BTA Starter removal
This topic has 3 replies, has 2 voices, and was last updated by
2 years ago
February 27, 2022 at 9:37 am Trying to remove my Starboard engine starter motor,Ive tried every combination of tools to get a socket over the top of the bolt,nothing works ā I cant even get to it on my Port engine that I have full access to with good visibility. Any seaboard tricks to get this bolt out? Is this what I am dealing with? Cummins Twelve Point Cap Screw Ā P/N 3968466 Thanks
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3 RepliesFebruary 28, 2022 at 3:25 am Thanks Tony – I got it out, glad I didn’t have to deal with any rusted bolts or it would still be attached to the engine.When I shutdown the engine the starter reengaged the ring gear briefly, I restarted and it and it did it again. Laying on the engine and bypassing the boats electrical system with a remote it happened again,I could hear the starter grinding –Ā plenty of juice in the batteries, it was spinning the engine over …Last Post by:
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4bta heat exchangers
This topic has 7 replies, has 4 voices, and was last updated by
January 26, 2021 at 5:26 am I have two 4btaās with 1600 hours – Ive never serviced the heat exchangers, last year I removed the aft end caps off both, they where immaculate with no blockage or evidence of corrosion, the engines operate in salt water and have been fresh water flushed after every use since new. Engine temps are stable at 180 -185 degrees (with 180ā thermostatās) regardless of load apart from slow speed running- they both tend to run a lot cooler. Due t…
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7 RepliesNovember 30, 2021 at 3:09 am I used gates marine fuel hose, 3/8’s ID if I recall correctly. Marine fuel hose has a larger outside diameter, and only the Gate’s branded marine hose was a perfect fit, it was slightly larger than the other brands. Cut to size, then run a knife down it to form a U shape.Last Post by:
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Fuel fitting ID
This topic has 2 replies, has 2 voices, and was last updated by
2 years ago September 22, 2021 at 6:20 am 4BTA Hi all, I need to ID the JIC thread and size of the fuel return fitting (marked as 1) so I can adapt it to take a 3/8 hose barb. Also need to ID Banjo bolt gasket size on the lift pump (marked as 2) Thanks
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2 RepliesNovember 9, 2021 at 7:28 am Dan, I have similar questions. Did you ever get the answers? I think the banjo fitting is 14mm….but I’m not sure. Side note, whenever I have a question and search the forum seems like you have already asked the same question! I must be right behind you in my 4BTA projects! ClintLast Post by:
posted: 2 years ago
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Air in fuel – cavitation vs restriction and entrained air
This topic has 5 replies, has 2 voices, and was last updated by
2 years ago
October 8, 2021 at 5:41 am Iām experiencing air in the fuel (a lot) and the loss of performance that goes with it, its clearly visible in the clear tube I have installed pre lift pump. Prior to stripping everything out of the fuel delivery system to troubleshoot I had 1 HG of restriction after the filters, vac gauge installed on outlet side of filter. Testing to date has has seen me strip everything in the fuel delivery/return on both engines to. Supply 5/8 SS pickup from…
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5 RepliesOctober 12, 2021 at 12:56 pm The clear vinyl tubing should be a heavy wall to prevent a collapse. However with the aeration I would not expect that to be a problem. No guarantee of course.Last Post by:
posted: 2 years ago
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Fuel restriction and RPM loss.
This topic has 14 replies, has 4 voices, and was last updated by
August 23, 2021 at 7:01 am I have been troubleshooting a loss of WOT RPMās on both engines under load, using a borescope I followed the supply lines across the top of the tanks to where they exit the aft compartment thru the bulkhead into the ER. Both supply lines are kinked as they enter the engine room thru the bulkhead, and appear to have flattened out on the bend over the years. There is no access the area -Iām creating a work plan to replace and reroute them,it wonāt…
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14 RepliesSeptember 18, 2021 at 5:14 am Easy or not, from all you have posted ( especially your last post) , would lead me to believe you need to somehow get a FULL 1/2ā³ ID line (minimum ID) all the way to the bottom of your tank Tony, to clarify 1/2ā fittings = 27/64 ID 1/2ā hose = 65/128 ID In your above equation are you allowing for ID loss on the fittings or are you saying 1/2′ minimum all the way?My latest plan if I can get it all in there would see the hose not rising ab…Last Post by:
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Pyro/EGT via NMEA
This topic has 6 replies, has 3 voices, and was last updated by
August 12, 2021 at 5:16 am Iām looking at Pyro/EGT install options via NMEA to my MFDās, thereās a couple of options out there however the only probe available wont fully extend into the exhaust elbow as shown in the pic,I doubt itās going to give a true temp reading. Any input appreciated.
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6 RepliesAugust 17, 2021 at 3:16 am Thanks Corey, apart from the probe issue it sounds like the could be software issues as well.Last Post by:
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Freshwater flushing, worth the effort?
This topic has 16 replies, has 10 voices, and was last updated by
3 years ago February 23, 2021 at 5:11 am For those sitting on the fence about doing it, I thought I should share this. I just pulled one of my aftercoolers, 16 years old, 3.5 years since last serviced,100% salt water use, freshwater flushed after every use – been flushing since they where new. Pulled the caps and the core slid out without any effort, not one tube was blocked. Pics 1 to 4 taken as it was disassembled, everything still covered in metalube, pics 5 to 9 taken after c…
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16 RepliesMarch 6, 2021 at 10:10 am And there are still those that do not believe in fresh water flushing & using the proper assembly practices & grease starting from DAY 1 .. Compliments of Bill Fuller ( Yanmar 4LHA 230’S) .. He listened to me 21 yrs ago.Last Post by:
posted: 3 years ago
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Exhaust Hose Replacement
This topic has 10 replies, has 4 voices, and was last updated by
3 years ago
September 9, 2020 at 3:47 am I have a section of exhaust hose in my boat that needs to be replaced,what are the thoughts of replacing a 5āā by approximately 40āā section of exhaust hose with silicone hose,the replacement hose would be entirely unsupported. The boat builder left no access to achieve this,the repair would be done 100% by feel with very little access,the existing setup was installed in the hull and the deck fitted over the top of it between two bulkheads. Afte…
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10 RepliesSeptember 14, 2020 at 6:55 pm You gotta do what you gotta do! I recently did a water pump replacement where it was necessary to remove the table and seat, then cut an access hole through the bulkhead, then remove the motor mount Before I could access the pump. I see thereās already a small access hatch in the floor, how about making that one bigger?Last Post by:
posted: 3 years ago
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4BTA lift pump
This topic has 5 replies, has 4 voices, and was last updated by
4 years ago
April 3, 2020 at 4:42 am One of my lift pumps is leaking fuel when priming (not leaking when engine is running) searching quick serve I can’t find any reference to the part. The engine is also idling a little rough and I’m down 50 odd revs at WOT, any chance the lift pump is letting air into the system? Thanks ESN 46514245
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5 RepliesApril 14, 2020 at 6:56 pm After a lot of digging I came up with the part number for the Bosch primer pump on the 4BTA-250 engine. Dan I hope this helps you. I came up with the Bosch # 2 447 222 126Last Post by:
posted: 4 years ago
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Oil cooler leak
This topic has 10 replies, has 4 voices, and was last updated by
4 years ago September 29, 2019 at 4:32 am Good morning, I have an oil leak from the oil cooler on one of my 4BTA,s.The repair looks fairly simple – is there any surprises to be wary of? Is it recommended to use a sealer on the gaskets or put them on dry or perhaps grease? Thanks
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10 RepliesMarch 5, 2020 at 2:11 pm Matt, I edited your number in an effort to protect it from bad things.Last Post by:
posted: 4 years ago
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HX parts
This topic has 2 replies, has 2 voices, and was last updated by
March 20, 2019 at 4:22 am Good morning, I’m looking for some parts for my heat exchangers, cummins have them listed as N/A, anyone know where I might source these? Engine SN 46514245 Part name/number U Ring Seal – 3393902 Thanks
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2 RepliesMarch 30, 2019 at 3:08 am Thanks Rob,I had already called Kevin without luck, tried sourcing them worldwide without any luck, rang a bunch of rubber extrusion manufacturers without luck – talking with Cummins they suggested seaboard… I ended up making oneLast Post by:
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Turboās,risers and HXās
This topic has 6 replies, has 4 voices, and was last updated by
February 15, 2019 at 6:43 pm In the lead up to hauling my boat Ive been chipping away at my riser to turbo bolts for six months,they have been on there since new in 06, with a bit of heat,lube some slight tapping , elbow grease and patience one by one they have come free except for one (on the bottom with very limited access) The boat came out of the water on Monday and I took both turbos and risers off, put a little heat on the last stuck bolt and it came free with some ch…
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6 RepliesFebruary 24, 2019 at 2:43 pm Hi Tom thanks for your input, I haven’t done anything with it all yet, just gathering options and looking at the ‘evidence’. I will pressure test the risers before I do anything, I assumed if they did fail the way they where orientated they would only leak down the exhaust,I have been told there is a possibility if they failed right up next to the turbo they could indeed leak water into the turbo at low speed, and that where 90…Last Post by:
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Marine AC
This topic has 10 replies, has 4 voices, and was last updated by
February 14, 2019 at 8:21 am My AC pump and strainer are mounted in a near impossible location to access/reach in the boat, I am contemplating moving the strainer to an area that is essentially at the same height as the AC unit itself,the pump will remain at the same level below the waterline. Weed can and does often fill the strainer in a matter of hours,and getting to it requires a midget on board and ends up being a messy affair, I have a great location I can move it to…
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10 RepliesFebruary 17, 2019 at 7:22 am Rodger, Thanks for the input,I have a freshwater flush tee on the intake side of the pump now I have used it to prime the pump on occasion,the preferred time for the strainer to block and the AC to shutdown seems to be around 2AM and the bride goes on the warpathā¦ To clean the strainer I have to raise the entire helm section and crawl across one of the motors reach down and do it entirely by feel.The other option is to open the small access hatc…Last Post by:
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Deck drains
This topic has 5 replies, has 3 voices, and was last updated by
January 6, 2019 at 6:13 am Hi all, Odd topic for here but I thought I would throw it out there in case someone can point me in the right direction. I am looking for some stainless (316) 90 degree deck drains to suit a 2′ hose, they need to look something like this (preferably with a wider top flange) All I can find with google is 1 to 1.5′ hose barb. Any help appreciated, Dan
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5 RepliesJanuary 21, 2019 at 5:31 pm I found a couple of solutions, these would have been perfect, made by gemlux but no longer produced,I need six and can only find two. https://www.greatlakesskipper.com/gemlux-2-inch-stainless-steel-boat-floor-drain-w-strainer Southco made a great scupper with a non return ball, but is no longer in production,I found a company that must have purchased old southco stock- page 37 of their catalog, unfortunately it is physically to big to install in…Last Post by:
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4BTA Temp Sender options
This topic has 2 replies, has 2 voices, and was last updated by
October 10, 2018 at 7:20 pm I currently have an aftermarket 195 degree temp alarm sender, a VDO temp alarm 205 degree sender? and gauge sender fitted to the cylinder heads of my engines. I’ve found an aftermarket NMEA 2000 probe that can be plugged into my Simrad MFD’S and have further alarms (visual and audio) and another temp gauge on the MFD displays. Is there an alternative option to fit another temp sender probe in a 4BTA? Tony mentioned another option for…
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2 RepliesOctober 13, 2018 at 3:09 am Thanks again TonyLast Post by:
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Groco Hull Strainer
This topic has 9 replies, has 4 voices, and was last updated by
February 17, 2017 at 6:41 am I’m looking at replacing my engine intake strainers to the groco hinged door style due to the oyster growth that occurs inside my present intakes,keeping them clean is virtually impossible. Anyone have experience with the groco hinged door intakes or a similar brand? Also what would be the size best suited for my application? 250 HP 4bta’s Thanks Dan
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9 RepliesFebruary 13, 2018 at 2:52 pm Tony, Sorry for the delay,appreciate the response and advice – thank you. DanLast Post by:
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Envirovent CCV Kit
This topic has 6 replies, has 3 voices, and was last updated by
February 9, 2017 at 5:16 am A few months ago I purchased the Seaboard Envirovent kits for my Cummins ‘B’ motors,the result was nothing short of sensationalā¦ The motors (originally fitted with Walker Airseps from new) both leaked oil from the Airsep’s and had a tendency to push the dipstick up and spray misted oil from that area. I stuck with them for nearly one thousand hours thinking they where what Cummins installed and they had to be the right thingā¦ G…
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6 RepliesFebruary 10, 2017 at 1:45 pm StarboardLast Post by:
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Cummins 4BT
This topic has 16 replies, has 3 voices, and was last updated by
November 11, 2016 at 8:19 am I haveĀ pair of 4BTA cummins in a pursuit,apart from the walker airsep’s leaking oil and the cold start pre-heater’s Ive had 1000 hours of virtually trouble free motoring. I’m aware of the 1000 hour service required,but in doing some research on it I see there was a lot of injector issues with these engines when first installed. One of my injectors has started to weep (externally) and I’m looking at the options to service…
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16 RepliesDecember 5, 2016 at 6:28 pm Tony I pulled one of the aftercoolers on the weekend,and was pleasantly surprised,no corrosion at all! Guess that freshwater flushing system I installed paid off! On the air side it was better than I was expecting,will get it all cleaned up and refit. I also installed the seaboard marine envirovent kits,your article on crankcase ventilation perfectly described what I was seeing with my “B” engines fitted with airseps,I’m glad t…Last Post by:
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4BTA fuel pressure
