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Diagnosing Possible Head Gasket
This topic has 9 replies, has 2 voices, and was last updated by
1 month ago March 2, 2024 at 2:37 pm I installed a pair of 5.9L 6BTA 370’s back in 2019 which now have 520 hours.Ā Both engines seem to run well and do not smoke.Ā The Starboard one fills the Recovery bottle after running up on plane for a few minutes.Ā The engine never gets above 165-170F throughout the throttle range.Ā Quickly cools down to 150ish at 650-850 RPM.Ā But when I let it set it does not suck the coolant back into the expansion tank.Ā I see no milkyness in oil or …
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in: Cummins Marine Engines
9 RepliesMarch 30, 2024 at 2:22 pm Clamped hoses.Last Post by:
posted: 1 month ago
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Loss of Cooling Water
This topic has 5 replies, has 3 voices, and was last updated by
9 months ago
July 3, 2023 at 3:27 pm Hi my 6BTA 370s with about 500 hours on them seem to be running fine – except. The Starboard engine looses sall the water in the expansion tank but the engine never runs hot.Ā The coolant goes to the “puke” tank and fills it up.Ā All the coolant is normally colored.Ā From a previous post I changeed the clear tubing from the expansion tank to the overflow bottle to the recommended blue silicone.Ā No difference.Ā If I add coolant…
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in: Cummins Marine Engines
5 RepliesJuly 9, 2023 at 5:02 pm Were you using a coolant recovery type cap.Ā Ā They look the same or nearly so as a standard cap. For a recovery type system to work it MUST have a recovery cap.Ā Ā There are two valves in a recovery cap, one opens as the engine heats and the coolant expandsĀ to allow coolant to escape to the bottle.Ā Ā Ā When the engine is shut down and it cools the coolant shrinksĀ developing a vacuum which will pull the expelled coolant back into the engine. &nb…Last Post by:
posted: 9 months ago
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Brand and size of anti-siphon fuel valve
This topic has 2 replies, has 2 voices, and was last updated by
10 months ago June 16, 2023 at 6:40 am I see there are anti-siphon and Check valves. It seems the are different and used for different purposes. <br />if I have 1/2ā fuel lines what size anti-siphon valve should I install so that I donāt restrict the flow so much. That is should I install a 5/8ā hose segment and use a 5/8ā valve. <br />any particular brand? Ā It seems the one I purchased takes a pretty fair amount of blowing or sucking pressure when I try it by mouth.Ā
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in: Cummins Marine Engines
2 RepliesJune 17, 2023 at 12:40 pm I read about using them on an earlier post. I would only use one for my center tank which is mounted lower than the outboard ones. Top of center tank is about 10 inches below bottom of the others and the fuel will drain back if left a day or so between cranking. Normally I just turn off the supply vale when using it.Ā <br />I donāt believe itās return is made to go to bottom of the tank. It was built by a shop for me in 1998 and I did not s…Last Post by:
posted: 10 months ago
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EGT probe Installation
This topic has 3 replies, has 3 voices, and was last updated by
May 25, 2023 at 2:24 am How much beyound the endo of the mounting fitting should the tip of the EGT probe extend into the exhaust? Any sealant needed on the nut that secures the probe tubing to the mounting bolt/compression fitting around the tube? Like Silkolene or something.Ā I put Neverseize on the mount t the exhaust. I ask because I mounted mine and after a couple of hours trial run the securing cap nuts on bot backout and one tube pushed up some.Noe one extends a…
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in: Cummins Marine Engines
3 RepliesMay 29, 2023 at 5:23 pm Just a note but many people do not understand that there are MANY different thermocouples each using different metal combinations for different purposes.Ā Ā If your local supplier did not have the correct wire or it is wired reverse polarityĀ it won’t work. TheĀ T.C. sold by Seaboard are K types to withstand the high temps.Ā Ā THe RED lead is the NEGATIVE, not the positive.Ā Extensions should also be the same type of wire , K, or it won…Last Post by:
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Shaft/Engine Re-Alignment
This topic has 6 replies, has 4 voices, and was last updated by
1 year ago
April 19, 2023 at 7:47 pm 25 Years ago I had SS strust made by my prop shop and they have done well. When the 6BTA’s were installed they were remove and reset as part of the engine install.Ā That was back in early 2019.Ā All has been well. However, I took my extended family out to see the 4th of July fireworks back last summer (’22).Ā I anchored up with dozens of other boats just out of the intracostal and watch the show.Ā Ā However, when heading back to the c…
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in: Boats & Repowers
6 RepliesApril 27, 2023 at 5:12 am Yes I have, and yes, I followed your directions.Ā I only really have one spot on the shaft to measure with a dial gauge and that is 4″ behind the coupler (v-drive boat).Ā My question is where the high & low spots are, and by how much, give you any guidance as to what adjustments in the motor mounts need to be made?Last Post by:
posted: 1 year ago
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Boost Saga Continues 6BTA
This topic has 6 replies, has 3 voices, and was last updated by
1 year ago February 2, 2023 at 8:35 am In a previous thread I asked what significance a difference in 2 PSI between engines was.Ā Previously they had been identical according to my SMX gauge on the bridge and confirmed by an elsctronic sender set in the salon. I just did a full after cooler servicing on both engines as per the Seaboard video and reinstalled everything.Ā On test run today there is still a difference in the engine readings.Ā But instead of just checking the readings at…
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in: Cummins Marine Engines
6 RepliesFebruary 6, 2023 at 4:35 pm I puled off the Port AC once again and rechecked everything.Ā Put double clamps on hoses where I could. Ran the boat today with and without the synchronizer and found no difference.Ā I’m beginning to be suspicious of the gauge even though it held pressure with my pressure test setup of the tubing holding pressure and the gauge on the bridge also holding steady.Ā But the pressure gauge setup at the engine read 12 PSI and the SMX gauge read …Last Post by:
posted: 1 year ago
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Boost Down 1 lb at Cruise
This topic has 5 replies, has 4 voices, and was last updated by
1 year ago October 9, 2022 at 5:44 am No smoke, engines run good, but notice that the Starboard engine Boost Pressure in no longer matched to Port \.Ā I have the Seaboard Dual engine Boost gauge and normally the two needles are one over the other.Ā Now at 2400 the StbdĀ (8) is about 1 lb less than the Port (9).Ā Ā I have Seaboard exhaust system and serviced the After coolers about 10 months ago.Ā Do Fresh Water Flushes on a regular basis. My list of things to check are: Re-service th…
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in: Cummins Marine Engines
5 RepliesJanuary 17, 2023 at 4:00 pm Turns out I just could not let this go and had to take things apart to satisfy my mind.Ā Here is ehat I found – core came out easily and all looked pretty clean on first inspection of the upper portion of the core.Ā But turning it over was another story.Ā I could see deposits from the zincs all around a few of the cores water tubes.Ā Fitting a small rod in the openings I foundĀ that not only those few that looked plugged but probably 40% o…Last Post by:
posted: 1 year ago
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Replace Zf220A trans flange.
This topic has 2 replies, has 2 voices, and was last updated by
1 year ago
July 13, 2022 at 8:31 am Is it possible to replace the transmission flange without removing the engine/transmission? Ā Mounted to 6BTA 370.Ā
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in: Marine Transmissions
2 RepliesJuly 13, 2022 at 3:26 pm Whatās the problem with the flange? Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā You might want to also replace the seal at the same time.Last Post by:
posted: 1 year ago
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Air in fuel lines
This topic has 2 replies, has 2 voices, and was last updated by
2 years ago December 9, 2021 at 3:25 pm About a year ago I installed a Maretron FFM100 fuel monitoring system for my dual 6BTA 370 engines. The Port has worked flawlessly from the get go but the Starboard has always given erratic data numbers. sometimes steady for a few seconds and then all over the place. Maretron replaced all of the hardware early on with no change in results. In an earlier post Tony suggested that the issue was likely an air leak in the fuel lines somewhere. …
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in: Cummins Marine Engines
2 RepliesDecember 9, 2021 at 7:38 pm Thanks for a suggestion about a place to start. How would I locate the offending injector? is there a test procedure or a trick like cracking a injector cap on either the injector pump or at the injector that would allow me to find the right one?Last Post by:
posted: 2 years ago
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Banjo fitting sizes for 6BTA Injection pump and Lift Pumps
This topic has 1 reply, has 1 voices, and was last updated by
2 years ago November 26, 2021 at 10:12 am I am planning on replacing most of my hoses and by passing the fuel fitting on the Combo block. Only using the Combo block for the Oil Pressure senders. Last year I already eliminated the Fuel Cooler. Are the three Banjo fittings on the Lift Pump and the Supply one on the Injection Pump (BOSCH 7100) all the same size. My parts books does show the M12 with 24mm long banjo bolt for fuel Return – but are all the same? Don’t see a…
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in: Cummins Marine Engines
1 ReplyNovember 27, 2021 at 1:23 pm Thanks, between looking further on the Seaboard site and just taking things apart and cleaning up I was able to get my hose refit done. Seems the two banjo fittings on the Injection pump and the Lift Pump are larger than the Return one that is shown in the 6BTA parts book I have. The one for the Injection pump seems to be a one piece fitting made up of the banjo – an extension tube and an integral fitting. At least it was tight enough t…Last Post by:
posted: 2 years ago
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Engine Rebuid Schedule
This topic has 1 reply, has 2 voices, and was last updated by
2 years ago October 14, 2021 at 3:56 am Tony I don’t see a Tony’s Tips about this but after following this forum for several years I see a number of people having major rebuilds after valve train failures, turbos blown, etc on 6BTA’s. Do you have a schedule that you go by for things like: How often to routinely adjust the valves. Pull and have cleaned service the injectors. How often to actually remove, inspect and replace the turbo. I’ve got it for the Afterc…
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in: Cummins Marine Engines
1 ReplyOctober 14, 2021 at 7:18 am Valve train failures and turbo issues are 99% the result of engine overloading and poor exhaust design and injector issues are due to poor quality fuel being fed to them. Do your proactive oil and coolant changes. As to the valves and injectors, unless you have a sign that something is not right: Valves adjusted every 1,500 hours or so and don’t even think about the injectors for 10K hours if your filtration is top notch. Never really ga…Last Post by:
posted: 2 years ago
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Starting Circuit Breaker Tripping
This topic has 2 replies, has 2 voices, and was last updated by
2 years ago August 31, 2021 at 2:25 pm Hi. 6 BTA 370. CPL 2208 Always runs like a top and starts right up at first application of the key. However today after relaunch from getting some bottom work done it started up just fine and ran fine. But after I refuled at the Marina the Starboard engine would not start. No solenoid click or starter engagement. Motored out a ways on the Port eng to anchor up and look this over. Checked voltage at key switch terminals, and worked my way back…
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in: Cummins Marine Engines
2 RepliesSeptember 5, 2021 at 4:50 am Iām going to have to scratch my head a little further. My boat is of 1965 vintage that was repowered several times over the years and last with these 6BTAās in 2019. All of the previous engine wiring was stripped out and new harness from the on engine connection forward was replaced with new from Seaboard However the one circuit not used with the Cummins floor plan was the red wire to the key switch and the purple feed to the Fuel shutoff sole…Last Post by:
posted: 2 years ago
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Enviro kit installation options
This topic has 5 replies, has 2 voices, and was last updated by
2 years ago May 20, 2021 at 2:26 pm My timing cover is used to hold a Glendining synchronizer cable adapter. So if I use the valve cover mount. Where is oil added to the system? Get another valve cover with the oil filler opening and replace one of the others? If so does it matter if the enviro kit is mounted on say the 2nd or 3rd valve cover position? Thanks
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in: Cummins Marine Engines
5 RepliesMay 24, 2021 at 5:00 pm Just showing options when #1 valve cover is in the wrong place.. Always prefer to use any/all height available, especially if the engine has more than normal blow-by..Last Post by:
posted: 2 years ago
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First Time Start-up for BTA 370 Fuel Bleeding
This topic has 4 replies, has 3 voices, and was last updated by
2 years ago March 6, 2019 at 6:43 am About to finish up my twin 370 BTA repower and need to prime the fuel lines. Best place to start. The engines were running right before install so the on engine filter should be full, the lines to the injectors should be full as well. I did remove and replace the fittings at the fuel intake manifold on the bottom of the block and lost some fuel during the changeover. However the all new fuel lines and fittings between the tank(s) and engine …
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in: Cummins Marine Engines
4 RepliesMay 11, 2021 at 4:13 pm I finally got it bled. I loosened the line into the fuel filter at the motor. Lots of air released. I pumped the manual primer. Reopened that line again. More air. The manual primer got tight and got the sqeak Rob mentioned. But she wouldnt start. I cracked open an injector, that same line into the filter, topped off the racor. Pumped again. Gave her some throttle and she fired over.Last Post by:
posted: 2 years ago
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ZF 220A Dipstick Reading
This topic has 3 replies, has 3 voices, and was last updated by
3 years ago March 26, 2021 at 11:53 am Just purchased your ZF transmission oil change hose kit. Drained oil out of each transmission with a total measure just over 5-1/2 quarts. The manual states to remove the dipstick by unscrewing counter and clockwise. Mine does not screw in but is retained by three O-rings and is push/pull. But it says to measure do not screw in (“Insert dipstick do not screw”). The O-ring seal set takes up over 1 to 1-1/4″ of depth from f…
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in: Marine Transmissions
3 RepliesMarch 27, 2021 at 6:59 pm Remember, a tad less than the upper mark in way better that a little more.. Between the marks is always best..Last Post by:
posted: 3 years ago
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6BTA 370 and Maretron FFM100 Choices
This topic has 11 replies, has 4 voices, and was last updated by
3 years ago February 1, 2020 at 9:02 am Seaboard and Cummins have normally recommended at least 1/2 inch fuel hose supply lines for the 6BTA 370’s and in the how to videos even suggested the supply lines should be 5/8 to be even safer. Even the old DD 8.2L diesels I had before required at lest 1/2 inch lines to reduce pump restrictions. The Maretron Fuel Flow Management system initial installation Started August 2019 after Ok my issue is I wanted to install a new Maretron FFM100…
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in: Cummins Marine Engines
11 RepliesMarch 27, 2021 at 5:13 pm Thanks Tony for keeping up with the thread. You got me straightened out early in this thread when I tried to summarize badly. I did not repeat that mistake again. Just letting John know the M2AR have 1/4ā fittings and that you showed me that that would have been my better choice and that the fitting change would not be a problem.Last Post by:
posted: 3 years ago
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Completed Repower of 38 ft Commander
This topic has 10 replies, has 5 voices, and was last updated by
3 years ago August 4, 2019 at 5:25 am Just completed the repower of my 1965 38ft Flybridge with rebuilt 6BTA 370ās with new ZF220Aās 1.75:1 Had Tony and guys build up a new exhaust system and fitted some of the SB engine upgrades and new custom engine and transmission mounts. With the old Detroit 8.2L Turbos with 2:1 TD 502ās top end at 3000 was 25 mph with cruise at 18 – 21 mph depending on load. Cruise at 2600 RPM burned 18 G/H. Propped with 3 blade bronze 22X20 on 1.5ā sh…
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in: Boats & Repowers
10 RepliesDecember 11, 2020 at 1:44 pm I think if you search on my name these should show up. I posted quite a bit in the past 2 years about this boat. fair number of pictures. Essentially, I cleaned out the previous engines and rebuilt the engine beds. Painted and updated the engine room and all hoses- etc. Made a wooden jig to rough align the engine mounts before install. Set the engines. Tony designed and made the engine mounts and designed and fabricated the entire exhaust f…Last Post by:
posted: 3 years ago
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6BTA alternate Coolant Temp Location
This topic has 3 replies, has 4 voices, and was last updated by
3 years ago September 17, 2020 at 3:20 pm Is this 1/2″ NPT Plug in the right side of the engine block just behind the Alternator a suitable place for a second coolant Temp Sender? Circled in Red.
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in: Cummins Marine Engines
3 RepliesSeptember 18, 2020 at 10:32 am Francis Valerio wrote: In Tonyās second picture the location circled āBetterā is a great spot on any of these engines with the turbo in that location. The Rear Cylinder on these B-series Cummin is the end of the line for the cooling system and with the turbo right there this area āmayā and āprobablyā will see some hotter temperatures than elsewhere in the system. In addition to the mani-cap, that rear location is where I put one also .Last Post by:
posted: 3 years ago
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Choosing the right power assist pump for 38ft boat
This topic has 13 replies, has 3 voices, and was last updated by
3 years ago August 24, 2020 at 5:34 am Squander Bucks is a 38ft Chris Commander with twin Diamond 370ās. Twin station controls and 3 line hynautic steering and Raymarine autopilot. All lines are 3/8ā ID Parker hoses for P and S lines and 1/4ā Return lines. Currently use straight ATF for fluid but will switch to the diesel mix when system is reworked. Steering pressure is very stiff on the bridge but light in lower station. Bridge where 99 % of all operations occur has Fraser ratio st…
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in: General Discussion
13 RepliesSeptember 8, 2020 at 8:56 pm That looks very nice!! Thank you for taking the time to show the end results.Last Post by:
posted: 3 years ago
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Dipstick Location
This topic has 1 reply, has 2 voices, and was last updated by
3 years ago June 24, 2020 at 12:50 pm My Port engine has an outboard mounted (water pump side) dipstick that has the tube arched over the engine top with the pull Handle up near the valve covers. It is very hard to remove and especially hard to get it fully seated back to full depth. It takes a lot of fiddling and jiggling for 5 to 8 minutes each time it is pulled out. I have tried polishing the tip, beveling the tip some, putting various little bends or hooks in the tip all with …
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in: Cummins Marine Engines
1 ReplyJune 24, 2020 at 3:21 pm post a few good picsLast Post by:
posted: 3 years ago
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Diagnosing Possible Head Gasket
