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- Cummins Marine Forum Topics
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160 VS 180 ThermostatĀ in 6BTA 5.9 M3
This topic has 6 replies, has 5 voices, and was last updated by
3 months ago
February 14, 2021 at 11:17 am Looking for advice at to whether I should stick with the 180 or change to the 160. I’ve read the article and would change to a 160 if I ran off-shore, get the protection factor from the additional prevent alarm at 190. Here are my current boating conditions: Most trips are 15 to 20 minutes cruising before I drop lines, some times less. Max cruises 45 minutes, which I do more just to ‘run’ the boat under a load. Troll a lot,…
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in: Cummins Marine Engines
6 RepliesFebruary 6, 2024 at 12:01 pm My experience w/the 160 t-stats in 6bta 370s was meh.Ā Yes, it ran cooler, but too cool at idle/trolling speeds.Ā They start opening close to 140 which is just too low.Ā Maybe I got a couple odd balls but they were both exactly the same. Keep the cooling system up to snuff, have an alarm that works, and pay attention.Last Post by:
posted: 3 months ago
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Gradual Loss of Power to Port Engine While Underway
This topic has 14 replies, has 4 voices, and was last updated by
9 months ago March 26, 2021 at 6:01 am In October 2020, I bought a 1999 Maxum 4600 powered by twin Cummins 6BTA 5.9L 370ās. Iāve put @ 30 problem-free hours on the engines that have 1361 total hours. Last week I was cruising for 2.5 hours with an hour to go to my destination when I noticed the boat began swerving to port. I looked at the rpm gages and noticed the port engine rpm was slowly loosing power. I had been cruising at 2500 rpm, which is typically what I set for long cruise g…
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in: Cummins Marine Engines
14 RepliesAugust 1, 2023 at 5:15 am Gskyward,Ā I’m no expect here.Ā But one big theme on this website is to make sure the boat is prop right.Ā So 3100+ RPM’s at WOT for those motors under a full load.Ā I have the same motors, so like reading the articles posted on them.Ā Your boat is 30K dry weight too.Ā That’s alot of boat.Ā I’m at 14K dry, ~20K rigged up.Ā Ā vicprop.com is another good reference point to use for prop recommendations.ĀLast Post by:
posted: 9 months ago
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Motor temp – 450 CTA 8.3
This topic has 5 replies, has 5 voices, and was last updated by
10 months ago
July 10, 2019 at 2:34 pm Iām new to diesels , notably the 450C. Purchased and sea trialed the boat (sea Ray 420 DB) in Dec. At the sea trial and engine survey the motors ran in the mid 170ās at cruise and 160-162 at idle. Now As I compare to other 450 C they seem to run about 160 at idle and at cruise. Fast forward 7 months both motors run 175-180F. At cruise Could it be that I have 180 thermostats? Nothing was noted as out of the ordinary with temps at survey and they …
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in: Cummins Marine Engines
5 RepliesJuly 11, 2023 at 2:18 pm Old topic but figured it may be better than starting a new thread. 6CTA’s I did my aftercoolers last winter and was running at 160 on both at cruise. One was horrible corroded ended up getting a new one from you guys.Ā Only at WOT would they go to 170ish. A few days ago my gauge was spiking to 180 for a split second and then dropping back down. Almost looked like a gauge electrical issue because of the speed of the up and down. Then I star…Last Post by:
posted: 10 months ago
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6B5.9 Belt Guard Bolt Oil Leak
This topic has 1 reply, has 2 voices, and was last updated by
1 year ago December 4, 2022 at 3:25 pm One of my 2, 370 HP diamonds (CPL 2208) leaks (heavily) from the belt guard lower right attachment bolt (viewed from engine front).Ā <br />Belt guard has different length bolts (3 bolts total)). Which length goes here?<br />Is there some sealing procedure for this bolt?
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in: Cummins Marine Engines
1 ReplyDecember 5, 2022 at 11:41 am Check out this link: Oil Leak 6bta 330Last Post by:
posted: 1 year ago
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Tach issue on 6BTA 5.9 – 1996
This topic has 1 reply, has 2 voices, and was last updated by
1 year ago
August 15, 2022 at 1:45 pm Having an issue with my Star Board tach, getting progressively worst each time out.Ā Won’t read at start up, but would start reading at 800 rpms, then read at slow idle (600 rpm’s) once warmed up.Ā Now it’s not reading till I hit the throttle to put the boat on a plan. The port engines has the Dual Output Magnetic Pickup Speed RPM Sensor (TACH) (2 sets of connections).Ā The port has the single output magnetic pickup.Ā Ā Does thi…
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in: General Discussion
1 ReplyAugust 22, 2022 at 5:52 pm This is just general. Make sure that the wiring , at sender AND at the guage,Ā is tight and free of any corrosion.Ā Even light oxidation can interfere.Ā Ā Make sure the guage itself is receiving full 12 v.Ā Ā Ā It is not just the ground wire but all of it.Ā Poor voltage to the guage will produce poor results. Check the sender.Ā Ā I am assuming you have one at the back of the engine which reads the flywheel teeth as they whiz by when the engine is …Last Post by:
posted: 1 year ago
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Speed issues?
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This topic has 29 replies, has 6 voices, and was last updated by
June 1, 2022 at 8:26 am Wanted to run this by the forum, I have a 1999 Pursuit express 3000 with Cummins 4bta 250hp in it. The possible issue I am having is getting the speeds that others get with this vessel. Props were redone to 19-22 or 19-23 cant recall, aftercoolers serviced (they looked decent), new injectors and valves adjust last season. New cutlass bearings and shaft seals. No smoke out the exhaust and fuel burn seems to be on par with factory test. I cruise a…
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in: General Discussion
August 6, 2022 at 5:38 pm Just a suggestion.Ā Ā Get the props checked as they are now.Ā Ā They may be off, one compared to the other, but you won’t be able to see the difference.Ā Ā Otherwise you are chasing a phantom.Ā The load may be slightly higher on the lagging engine. If they are off then get that corrected.Ā Ā Ā Ā Ā Ā Then test for prop corrections to get the revs up.
29 Replies
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DIY aftercooler cleaning?
This topic has 2 replies, has 3 voices, and was last updated by
1 year ago July 21, 2022 at 3:28 am I wanted to ask if anyone if anyone has had any good success with a way to clean your aftercooler at home? Iāve heard of doing it basically using a large turkey pot filled with something like purple power and heating it up but not too hot and doing an overnight soak? Just wasnāt sure if there was any reason why this would be a bad idea? Or is there a better way?Ā
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in: General Discussion
2 RepliesJuly 22, 2022 at 5:56 am Check out Tony’s tips.Ā Here’s a key link on maintenance:Ā Cummins Marine Aftercooler Maintenance Plus SMAR has the maintenance kits with everything you’ll need.Last Post by:
posted: 1 year ago
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Hurth Trans pullout!
This topic has 14 replies, has 8 voices, and was last updated by
1 year ago
May 5, 2022 at 3:28 pm Have Carver 405 with Cummins 6btaās. Ā Seems that my gear cooler leaked in sea water and into the Hurth Tranny Ā So wonāt stay in gear now. Ā Have checked around and had one quote of $3,000 JUST TO PULL IT OUT and RE-INSTALL ! Ā NOT FIX IT. Ā Iām thinking thatās a little high? Ā Yes it will be a job to do this but $3,000? Ā I will take it to the transmission guy myself. Anybody think this is high? Thanks Ā
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in: Marine Transmissions
14 RepliesJune 13, 2022 at 1:43 pm A little late to the forum, but I had the same issue about 20 minutes after splashing last season.Ā I pumped out the old salt water /ATF about 2 hours after getting to my marina.Ā I bet I replaced the ATF 5 times and still was getting milk shake looking ATF out and low trans pressure a couple minutes after starting the engine.Ā I then did 2 flushes with diesel, then 3 more ATF to get rid of the diesel and see a nice cherry red ATF.Ā Pressure cam…Last Post by:
posted: 1 year ago
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Prop speed, worth doing?
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This topic has 28 replies, has 16 voices, and was last updated by
2 years ago March 1, 2019 at 12:30 pm Thinking of trying some new ACME props and wondering while Iām at it if I should put prop speed on the running gear. Has anyone had experience with this product?
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in: General Discussion
March 7, 2022 at 1:22 pm I’ve had good results with prop-speed.Ā Basically extended cleaning the running gear for 12 months and not having to pull the boat last season.Ā Ā Prop-speed applied May, 2020 No running gear cleaned in 2020 1st cleaning Labor day weekend 2021 (had lost 2 knots), one side was fine the other had a barnacle strikeĀ Had diver clean running gear again in Nov B4 the water got to cold as a pre-cautionĀ Once its scape it’s lost it’s ef… 28 Replies
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posted: 2 years ago
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6BTA5.9-M3 370 slow cold crank
This topic has 5 replies, has 4 voices, and was last updated by
2 years ago
December 7, 2021 at 2:13 pm First time post so please be patient with me (yes I have used the ‘search’ function). I am under contract to purchase a 2001 Tiara 35 Open powered by twin 6BTA5.9-M3 370 engines (my first diesel boat after decades of gas inboard and outboard experience). Serial number 46080412 (p) and 46080435 (s). Hours are currently 1122. Current owner purchased boat 5 years ago with 675 hours. Current owner states that he has been catching up…
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in: Cummins Marine Engines
5 RepliesDecember 9, 2021 at 1:11 pm Mike, Thank you for your very relevant thoughts on the cold start matter. I saw the parallel switch under the cabin steps, next time I am on the boat I will locate the helm parallel switch. Regards, BobLast Post by:
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Fuel filter
This topic has 16 replies, has 8 voices, and was last updated by
2 years ago November 9, 2021 at 8:07 am When I purchased boat it had a 30 micron filter in racor and a 5285 on engine filter .It was recommended to me to change the racor to a 10 micron filter.480 ce.wondering if 10 micron is the norm.Bill
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in: Cummins Marine Engines
16 RepliesNovember 16, 2021 at 8:44 pm Iāve been using 2 mic Racor and 2mic fleetguard. I change them at 100 hours. Never had any issuesLast Post by:
posted: 2 years ago
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General Feedback on Propeller slip
This topic has 4 replies, has 3 voices, and was last updated by
September 30, 2021 at 5:42 am I have a 40ft boat with a 2003 cummins 450 diamond. 1.34 gear ratio. I believe the prop currently on it is a 22×20 4 blade but I need to have that pulled and checked. But if the pitch is correct I am calculating a prop slip of 42% at 2300rpm, 19mph. Boat is currently over propped and plan on pulling soon. Going to take a couple maybe 3″ if possible out of the pitch. At least that was my initial plan. But if a different size and or sha…
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in: General Discussion
4 RepliesOctober 22, 2021 at 11:47 am Try talking to a company called Accutech Marine Propellor. He has acted as a consultant several times that I am aware of. HomeLast Post by:
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ValvTect Diesel
This topic has 4 replies, has 3 voices, and was last updated by
2 years ago October 7, 2021 at 10:23 am As sort of a default, we tend to lean towards marinas that carry ValvTect diesel, thinking it’s healthier for the engine. I’m intertested in feedback as to how important this is? I guess an alternative is to get generic diesel as long as you’re dealing with a US marina that has relatively clean fuel, then you can also use an additive.(?)
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in: General Discussion
4 RepliesOctober 8, 2021 at 12:39 pm Fuel Polishers are an interesting subject. Some of the big trawlers and long range cruisers have separate polishers. Conceptually those are just filters that “pre-filter” the fuel in the tank, some even try to kill microbes with UV light…… I guess the idea is to clean the fuel before it gets to the Primary and Last Chance filters. Get rid of the junk before it has a chance to possibly cause an issue while out at sea. …Last Post by:
posted: 2 years ago
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Engine Cleaning
This topic has 2 replies, has 3 voices, and was last updated by
2 years ago September 22, 2021 at 8:21 am Does anyone have a recommendation for what to use to clean the engine/trans? Or do you have a product/procedure you use? I have no need to make it perfect. And aside from pulling the engines, I have no room to do that either. But I would like to use some sort of spray on/wash off cleaner for the block etc. I looked through Tonys Tips but didnt see anything. Also couldnt find anything via a search function.
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in: General Discussion
2 RepliesSeptember 24, 2021 at 6:10 am Iāve had good results with Super Clean on my vehicle engine and with oil clean up in the bilge. Spray on, wash off with water. Make sure there is some air ventilation with the aerosol spray.Last Post by:
posted: 2 years ago
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Exhaust Type?? For Engine Off Flushing
This topic has 19 replies, has 9 voices, and was last updated by
2 years ago September 10, 2021 at 11:25 am I have a GB 2008 EU 47 with QSC 8.3 and Iām trying to figure out what type of exhaust I have so I can hopefully install an engine-off fresh water flush system. It doesnāt look like a lift muffler at all (which I know you canāt use for engine off flushing). What type is it? See any issue with engine off flushing? Itās all downhill from the raw water inlet to the exhaust, and the 3ā diameter pipe off the muffler is above waterline. The main exh…
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in: Cummins Marine Engines
19 RepliesSeptember 18, 2021 at 7:01 pm You are obviously on a mission. Allot not less that 25 gallon per flush. Then, you really need to “taste” what you got to be sure at a minimum..Last Post by:
posted: 2 years ago
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4bta Fuel Cooler Delete / Fresh Water Flush
This topic has 7 replies, has 4 voices, and was last updated by
2 years ago August 29, 2021 at 9:49 pm I fabricated a fuel cooler delete that incorporates a fresh water flush port. I chose post raw water pump for simplicity, no need to run engines will eliminate climbing up and down to the flybridge. The design intent is that the raw water pump will get fresh water flushed by water that seeps past the impeller. My raw water system self drains, seeping backwards past the impeller, to a level of aftercoolers about ā full. My typical usage could b…
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in: Cummins Marine Engines
7 RepliesSeptember 7, 2021 at 7:27 am Here’s a good read: Understanding Marine Fuel CoolersLast Post by:
posted: 2 years ago
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VDO Tach/Hourmeter
This topic has 14 replies, has 7 voices, and was last updated by
2 years ago December 8, 2016 at 9:17 am Recently I replaced my port side raw water pump, and upon running the engine (4BTA) for the first time after the install, I noticed that the hour meter in my tach (analog) was not working. The tach itself was working properly.Ā The hour meter was working prior to pump replacement. I don’t have a schematic of the control of the hour meter (what turns it on).Ā Is it controlled by just the key switch, or is it somehow controlled by the alarm …
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in: Instrumentation & Electronics
14 RepliesAugust 9, 2021 at 7:56 am Corey at SBMAR did have some used VDO tachs too, that was second option I was considering if I could not get the tach fixed.Last Post by:
posted: 2 years ago
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tachometer help
This topic has 2 replies, has 3 voices, and was last updated by
2 years ago August 4, 2021 at 6:57 pm Hello all. I’m running 2002 34′ Riviera sport fisher with 2 6BT Cummins diesels. I’m having RPM gauge issues. Port side takes a awhile for needle to come up from zero and starboard side gauge is stuck at 550 with engine off. Both gauges will eventually start acting normal after about 15-20minutes of operation. But I”m really having trouble even locating where the senders are on the motors so I can start there. Can someone…
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in: Cummins Marine Engines
2 RepliesAugust 5, 2021 at 6:58 am Tossing this out – are you sure you have a tooth counting bell pick up? My 1999 6BTAs sense RPM from the alternator. Check your wiring harness diagram.Last Post by:
posted: 2 years ago
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Freshwater perko raw water plush cap
This topic has 16 replies, has 6 voices, and was last updated by
2 years ago July 23, 2021 at 4:21 pm Hi all. Looking at putting a fresh water flush on QSBs 5.9. Looked and read and gone with I think is the better way ? Open to feed back. That is to bring in the Freshwater at the raw filter. Can you buy the caps to suit the Perko filters already done or can you successfully drill and tap or use 2 rubber gaskets on a fitting to do the job ?? I know I can probably come in after the pump but just not certain that the exhaust is feeding downward…
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in: Cummins Marine Engines
16 RepliesAugust 2, 2021 at 1:22 pm I used SBM inline T hose fittings with on/off ball valves directly attached. A 3/4ā hose from A perco garden hose hookup on the back deck allows only one water hookup to get the process started. Turn water on, turn all engines on, one at a time open a ball valve, run for a while turn off engine, close its ball valve. Open next ball valve, etc. All water hookup are done on the back deck. So no open hoses inside the boat. I added a pressure re…Last Post by:
posted: 2 years ago
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160Ā° Thermostats in a 6B: What is normal behavior?
This topic has 17 replies, has 8 voices, and was last updated by
2 years ago May 24, 2021 at 5:56 am Twin 6bta 370’s, 1996 manufacture date, 1600 hours. I was battling engine temps that were creeping to 195Ā°F last season. So this offseason I took off heat exchangers, aftercoolers, gear coolers (fuel coolers were deep-sixed), rodded, acid washed, new gaskets/orings etc. There was some significant blockages in the heat exchangers around the zincs. I also decided to swap to 160Ā°F thermostats so I wouldn’t spend 50% of my time starin…
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17 RepliesMay 25, 2021 at 7:04 pm For JimmyK, My thoughts on all of this go like this….. We spent a coupe of years trying to come up with a thermostat that gave the B more protection & time to respond to any over heat issue….This is what we came up with as a best compromise .. Sure, I’d like the engine to heat to 180F at fast as possible and then have thermostat that was so “variable” that if the temp went to 181-185f it world bring the tem…Last Post by:
posted: 2 years ago
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160 VS 180 ThermostatĀ in 6BTA 5.9 M3
