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- Cummins Marine Forum Topics
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6BTA 5.9 Oil Pressure Loss
This topic has 2 replies, has 3 voices, and was last updated by
2 years ago
October 16, 2021 at 12:01 pm 1998 Carver twin 6BTA 5.9 370HP port engine serial number 45500671. After oil change in both engines the port engine loses oil pressure with increase in RPMs. After warm up to 180 deg and running up to 1500 RPM the oil pressure gauge on bridge reads normal 55 PSI. Increase to 2500 RPM gauge drops to 0 PSI. No oil under engines and no loss of oil on dipstick. Temps taken with infrared thermometer and bridge gauges do not show any overheating…
2 RepliesOctober 26, 2021 at 4:57 pm Iām not Tony by any means but Iāve read enough and observed enough to say: – these engines almost never have oil pressure issues – itās most likely your sender or gauge, and it sounds like someone monkeyed with your sender (no pics thoā¦post em) – if you were truly losing pressure the motor would have detonated by now 6000 miles later ā how worried could you be haha – if you can boat the great loop you can get someone to…Last 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
2 years ago
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…
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:
posted: 2 years ago
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3 wire alternator wiring
This topic has 7 replies, has 5 voices, and was last updated by
2 years ago
August 12, 2021 at 12:36 pm I understand that #2 connects to the battery and #1 connects to the ignition in one of the pictures on this site it says use it if you want the alternator to turn on faster. Can someone elaborate on this? Like what are we talking about time or at a higher rpm? Reason I am asking is I am pretty sure my alternators are not charging the battery but I am also pretty sure neither #1 and #2 are not connected. I will not be at the boat till tomorrow…
7 RepliesOctober 17, 2021 at 2:07 pm Maybe, just maybe, the batteries are shot?Last 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
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…
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:
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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.(?)
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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Generators hard to find
This topic has 1 reply, has 2 voices, and was last updated by
2 years ago
October 3, 2021 at 6:31 pm Westerbeke are 3 to 4 months on delivery , Phasor are 3 to 4 weeks , Westerbeke worth the wait ? So many different opinions out there .
1 ReplyOctober 5, 2021 at 10:42 am Have you considered a Northern Lights?Last Post by:
posted: 2 years ago
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Twin diesel with out drives
This topic has 3 replies, has 4 voices, and was last updated by
2 years ago
August 24, 2021 at 3:20 pm Hello Im new, I am looking to find out if all marine diesel engines with in the 150 – 500HP can be used with outdrives. I am building a barge and would like to use out drives with diesel engines. I have seen volvo penta with alphas and a yanmar with an I/O, but I am interesed in cummins, kubota or cat as well. Any help on the subject would be a great help Thank you
3 RepliesOctober 2, 2021 at 7:29 pm Mercury MerCruiser has a diesel package with their Bravo 3 drives. I believe the engines come from Volkswagen https://www.mercurymarine.com/en/us/engines/diesel/Last Post by:
posted: 2 years ago
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ZF 63IV ATF flow direction
This topic has 3 replies, has 3 voices, and was last updated by
2 years ago September 24, 2021 at 8:11 am I purchased a couple of the in-line tempeture probe kits for the ZF 63 gear. On the gear it is stamped IN and OUT. I installed the probe on the OUT line to the gear cooler but now looking at it, I think was the wrong side. It looks like the ZF Manual has the flow opposite to what I would think as in and out mean. Unless the markings on the gear are in reference FROM the cooler. I have seen the temp and pressure location pictures but canāt find …
3 RepliesSeptember 25, 2021 at 9:06 am As long as you gear tems stailizes below 150F +/- 10 F, no need to worrys about it…..IMO most gears in marine applicxations are over cooled anyway as the oil rarely reaches over 130-140F for any length of time and does not get rid of the moisture that gets in it………… One might say, “hotter” in better than “cooler”.. The automatic transmission in your car runs in the 160-220F range all the ti…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.
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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Low idle RPM at startup, then normal?
This topic has 6 replies, has 4 voices, and was last updated by
2 years ago September 20, 2021 at 8:45 pm Hello, New member. Twin 6CTA8.3 450 diamonds on a 2001 Tiara 3800. Approx 1500 hours. Purchased 2-3 months ago. Immediately updated the water pumps to SMX, pulled aftercoolers and hx exchangers, seemed the previous owner kept them clean. No maintenance records though, was just told āhe kept them pristine, open checkbook etc.ā The RPMs via tach are different than when phototached but not too bad. The RPM on the tach shows lower. Anyway!!! I digr…
6 RepliesSeptember 21, 2021 at 6:46 pm Cut and paste whre is says “suggested idle is 650 RPM”…………………………..One of us will be eating humble pie..Last Post by:
posted: 2 years ago
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Voices
This topic has 3 replies, has 3 voices, and was last updated by
2 years ago
September 5, 2021 at 12:33 pm What are voices and how do you access them, please?
3 RepliesSeptember 6, 2021 at 5:43 am Thanks, guys.Last Post by:
posted: 2 years ago
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Qsl 9 prop sizing
This topic has 7 replies, has 2 voices, and was last updated by
2 years ago
August 16, 2021 at 7:28 pm I am repowering to a Cummins qsl 9 405 hp engine . I have a 43 ft displacement hull boat that is a dragger . Max speed is around 9 to 10 knts . The gear ratio is 2:1 and maximum propeller diameter is 28ā . Any suggestions on pitch size for this motor . One prop calculator suggest a 30×21 .
7 RepliesAugust 22, 2021 at 6:04 pm A 30×21 was his recommendation but because I can t swing a 30ā and can only swing a 28 I was thinking either a 28×26 or 28×25 . I saw where you had installed several of the qsl 9 so I thought you might know somewhere in the ballpark what size t might turn wheel wise .Last Post by:
posted: 2 years ago
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Qsm11ās leak
This topic has 1 reply, has 2 voices, and was last updated by
2 years ago August 15, 2021 at 5:20 pm I have just bought a maritimo 48 with twin qsm11ās 660hp. Can you tell me what this leak is from?
1 ReplyAugust 21, 2021 at 11:40 am More like a “sweat” from years past……….Clean it up and watch.. Certainly far from “mission disabling”..Last Post by:
posted: 2 years ago
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VDO Tach / Aetna Sender / Mag-Pickup Combo?
This topic has 6 replies, has 2 voices, and was last updated by
2 years ago
August 9, 2021 at 2:06 am Hey Everyone!!! Purchased a 38 Pursuit – 2002 with a pair of 6CTA8.3 450 Diamonds (CPL 8089/2172?) back in Oct 2020. ESN – 46157332 / 46156149 I phototached the viscous damper for each engine and compared to the current VDO Tachs and I am geting +/-5% at each 100 RPM. Checked from 650 all the way to 2950. Almost a 5% variance each 100 RPM. The VDO tach is showing lower than actual. I have found a website with what appears to be my ta…
6 RepliesAugust 19, 2021 at 3:23 pm So I went down to the boat yesterday- unplugged the tach sensor on the flywheel (just from the wire, didnāt actually remove the sensor/mag pickup) and ran the engine. Sure enough- the rpms still worked. So this makes me believe there is an Aetna sender, attached to a VDO gauge. Is this normal? Iām assuming this definitely wonāt work properly as thereās no dipswitch configuration for 8 pulses / revolution for the VDO gauges. Do I just put aetna d…Last Post by:
posted: 2 years ago
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Alternator No Output below 1200 rpms
This topic has 2 replies, has 2 voices, and was last updated by
2 years ago
August 15, 2021 at 2:29 pm 3 month old 19 SI alternator 105 amp on a qsb 5.9. Alternator on port side does not have an output until the engine reaches 1200 RPM. Iām sure someone has dealt with this before, any input on how to correct the issue? Issue is only on the port side, starboard side puts out 13.7 V at 600 RPM
2 RepliesAugust 15, 2021 at 4:57 pm Tony I can get pictures when I get down to the boat next time. The excite wire (1) isnāt wired to anything. The sensing wire (2) is wired back to the + on the alternator. This is how the arrangement was before replacing the alternator.Last Post by:
posted: 2 years ago
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6CTA 8.3
This topic has 5 replies, has 3 voices, and was last updated by
2 years ago
August 2, 2021 at 9:22 am Hello. Looking at a new boat with 6CTA. Been researching on this website but looking for advice. (I have a 5.9 6bta, not familiar with 6CTA). Looking on Quickserve some numbers donāt match. Concerned about valve/valve seat. Any help appreciated. SN 46353945 Cpl 8089 Thanks in advance Brian
5 RepliesAugust 3, 2021 at 5:35 pm I have the same motors. Treat them well and they’ll out live you. Arguably the best mechanical motors Cummins has made. I lost a transmission because my Hynautics we’re slipping but solved the problem with new Glendinning electronic controls. Good luck.Last Post by:
posted: 2 years ago
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Alternate Heater Hookup location – 6CTA
This topic has 1 reply, has 1 voices, and was last updated by
2 years ago
July 27, 2021 at 12:15 pm Hello, A question regarding heater hook-up location on a 6CTA. Iād like to add the heater hook-up loop to the hot water heater and hoping someone can confirm I have the location of the return (low pressure) correct. I have reviewed the location in Tonyās Tips, https://www.sbmar.com/articles/heater-hookup-ports-for-your-b-c-series-cummins/ My hook-up will be on my starboard engine and on that engine the coolant filter is on the left side of the e…
1 ReplyJuly 27, 2021 at 12:17 pm With photo’s …Last Post by:
posted: 2 years ago
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cummins 6bta 300hp oil comsumption
This topic has 9 replies, has 3 voices, and was last updated by
2 years ago
June 10, 2021 at 5:01 am Hey guys I have an oil consumption issue and I don’t know where its going. I just recently purchased a boat and it has been running just fine engine sounds and runs great performance wise but about 100 or so hours in of use I started to notice oil lowering on the dip stick. I did have a minor oil leak from where it connects to the engine tightened up the bolt and it went away this could not of been the leak. I thought it could be clogged a…
9 RepliesJuly 26, 2021 at 6:15 pm So I took it all apart and this is what I have found. There is about 0.004″-0.008″ up and down play with the turbine. Compressor side was wet with oil, exhaust side looks to be dry soot. See Pics There was oil on the outlet of the aftercooler. I still have a bunch of soot building up even with the Envirovent installed.(was going to do the exhaust gaskets just for peace of mine since I had it all torn apart) It is rusty on the coolan…Last Post by:
posted: 2 years ago
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Oil leak
This topic has 2 replies, has 2 voices, and was last updated by
2 years ago July 18, 2021 at 5:55 pm On my 480 ce I have had an oil leak on my port engine since purchasing.It seems to be the rear main seal as itās leaking from the bell housing and is dark. I lose maybe a pint in a season so I put a hose on it and let it drain into a milk jug. Now I have started to notice a minor leak coming from where my starter bolts on. Not sure if this is from the leak into the bell housing or if from somewhere else. Not sure how oil would get to that spot a…
2 RepliesJuly 19, 2021 at 5:13 am What I did to monitor how much was leaking was put a hose to a garden hose repair end which screws into a barb I screwed in slightly to the plug in bottom of bell housing.The picture shows the hose going into milk container in bilge. I will monitor as I have been. Not enough so far to do anything about.Never noticed oil by the starter before so thatās why I mentioned it.Thanks for the reply.BillLast Post by:
posted: 2 years ago
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Stretchy belt demount and install QSB 5.9 440hp
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This topic has 23 replies, has 5 voices, and was last updated by
2 years ago April 27, 2021 at 6:22 pm Having investigated ordering replacement belts as spares for my 2 QSB 5.9 440HP engines, I was surprised to see the single “stretchy” belt used to drive the raw water pump with no visible means of tension adjustment. Reading up on these belts, I now need to buy a special tool to both demount and re-install these belts and it seems there are a number of types of tools available for the task. Just wondering who may have also confronte…
July 16, 2021 at 5:51 pm and still more of the message that was blocked: I did also find a tool to mount/remove this belt and its a GearWrench tool #3681D. I haven’t used it yet but when my new SMX raw water pump arrives, I will try to take plenty of pics and post to this thread for others to see how it worked. If you Google “stretchy belt fitting tool” you will find plenty of different tools available including on Amazon. I enjoy the collective wisdo…
23 Replies
Last Post by:
posted: 2 years ago
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6BTA 5.9 Oil Pressure Loss
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