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- Cummins Marine Forum Topics
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How to adjust early style QSB 5.9 v-belt tensioner bracket
This topic has 2 replies, has 2 voices, and was last updated by
2 years ago April 25, 2022 at 6:37 am Hello.What is the proper way to tighten the v- belt tension on the early style QSB 5:9 bracket? Thanks
2 RepliesApril 28, 2022 at 5:18 am Thanks.Ā I wasn’t referring to the tension itself but how to actually adjust the belt pulley on the bracket which has a threaded rod with 2 nuts.Last Post by:
posted: 2 years ago
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Pencil Zinc Install
This topic has 19 replies, has 12 voices, and was last updated by
2 years ago
May 8, 2017 at 9:21 am In an effort to not ignore the basics, I’m posting these tips on replacing zincs. The aftercooler and heat exchanger zinc cap threads are 1/2″npt and the gear cooler zincs caps are 3/8″npt.Ā Having taps of each size in your “zinc kit” is a good idea so you can chase those threads clean.Ā Thread the new pencils onto your caps and snug them up you do not want them coming lose and banging up the tube ends of your coole…
19 RepliesApril 27, 2022 at 5:44 pm I will chime in also. I Rectorseal #5Ā the zinc threads themselves.Ā Ā Then I use pliers or a vise and a wrench to tighten the zinc into the cap.Ā Ā Snug firmly onlyĀ asĀ the smaller ones can be weak and break if overtightened. Seals the threads so they are protected fromĀ the seawaterĀ Ā so they do not degrade, at least not untill the rest of the zinc is gone.Ā Ā That way they do not fall out of the cap. IĀ then rectorseal the cap threadsĀ for th…Last Post by:
posted: 2 years ago
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6CTA Diamond 450 starting batteries
This topic has 5 replies, has 5 voices, and was last updated by
2 years ago
March 27, 2022 at 10:43 am I am coming due to replace my start bank.Ā It is two 8D 12Volt AGM batteries. I think this is overkill but that’s the way the boat was when I bought it four years ago. Starting and charging system are all 12 volts.Ā Can I safely go with a single battery?
5 RepliesApril 26, 2022 at 11:01 am Ā I’m also considering getting rid of my two 8Ds and replacing with two group 31 AGMs, dedicated to starting my 6BTAs. I could wire these in parallel to double the amps capacity at cranking and could eliminate the “PAR” switch and solenoids. Essentially eliminating the 8Ds which are massive and dangerously heavy to move. And I will gain a full 8D tray space like Brian for supplies/fluids etc. Same charging setup as Jay. Port ch…Last Post by:
posted: 2 years ago
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Repower 6bta to 6cta
This topic has 3 replies, has 3 voices, and was last updated by
2 years ago April 24, 2022 at 4:53 pm HelloĀ We have a 32 Radon currently with a 6bta 315 and ZF85 IV 1.64:1 turning a 20×21 blade prop on 1.5″ shaft.Ā Ā Boat is quite heavy for it’s size and loaded with full fuel, no fishing gear, ice, etc weighs 12500 lb.Ā Needless to say, it is a 9 knot boat as it is not practical to push the 6Bta to get on plane.Ā I am considering repower with a 6cta 430/450 to make long runs more tolerable.Ā Don’t want to be cheap yet don&…
3 RepliesApril 26, 2022 at 6:20 am I was introduced to Radons and Wilsons in the early 80’s. The Radons were 1st (early 70’s) and Wilson came along after about 10 yrs of Radon’s introduction.. Both builders were about 30 miles from my shop and both builders built their reputation and business based on the successful commercial sea urchin industry in S. Calif. The hulls were perfect for what these 1,2,3 or 4 person dive boats needed.Ā Since the early 80, I have r…Last Post by:
posted: 2 years ago
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HEAT EXCHANGER looks good or bad?
This topic has 10 replies, has 4 voices, and was last updated by
2 years ago March 18, 2022 at 4:57 pm So I decided to do a full service in my qsc engines. Started as just after coolers, then found a leak in my coolant on heat exchangers so decided to do the same pull and clean process for them. lots of work but well worth it I think. Anyways just want to know how these look to you guys. Iām looking at the cores and am unsure if this like gap in the metal is normal? It looks like itās Mwant to be that way. Also the pipes I am wondering why they l…
10 RepliesApril 23, 2022 at 9:54 am If that’s the water divider then the gap is fine. Mine have the same gap.Last Post by:
posted: 2 years ago
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Proper break in for a reman Cummins 6cta
This topic has 1 reply, has 2 voices, and was last updated by
2 years ago April 18, 2022 at 6:49 am I’m looking for the proper way to break in the remanufactured, from the factory Cummins 6cta.Ā Ā Ā
1 ReplyApril 21, 2022 at 5:49 am 1) Most important is to be sure the engine is propped correctly–100+ RPM over rated with the boat fully loaded 2) if you are replacing like for like, be sure what ever took out the old engine does not repeat itself on the new installation 3) To the break- in itself, run easy for at least an hour or two at “wine & cheese” speeds while checking everything a few times 4) After that, IMO it’s up to you, but checking…Last Post by:
posted: 2 years ago
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6BTA 5.9 Low Oil Alarm Relocate
This topic has 2 replies, has 2 voices, and was last updated by
2 years ago
April 18, 2022 at 6:30 am Hi all, I am servicing my 2 6BTA-5.9 370Hp motors in our Tiara and installing the SB fuel cooler delete kit.Ā Everything is just about going back together and have relocated the oil pressure sender into the engine block port per the instructions….BUT I have a second sender/switch that was in the combo block (see photo) that no one mentions about relocating.Ā I believe it is the low oil pressure alarm switch….I plan to install it in a…
2 RepliesApril 20, 2022 at 7:10 am Yep, that is exactly where I am planning to install the switches…I did have to get some more 10MM to 1/8NPT adapters like the ones that came with the kit so I should be good to go…..fingers crossed.Last Post by:
posted: 2 years ago
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Cummins 6BTA 5.9 330hp Ramdom Loss of RPM's comes and goes
This topic has 7 replies, has 3 voices, and was last updated by
2 years ago
July 11, 2018 at 6:46 am Good morning all. This issue has been coming and going for several months now. Sorry for the below detail but I think some background is needed, no help from 3 diesel tech’s thus far as they have/can not witnessed the problem when on board. In the starboard engine (545 hours) , all runs great, all gauges are normal no white smoke or black smoke. On the 4th we were our all day clocked about 60 miles engines ran great then approaching my mar…
7 RepliesApril 18, 2022 at 6:11 am Hi Rick, I know this is very old thread but just curios what you did to solve the problem? We are having the exact same issue now and our mechanic cannot seem to figure it out. We have had the fuel polished, changed all filters etc and still getting random losses of power later in the day.ĀLast Post by:
posted: 2 years ago
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QSB 5.9 service aftercooler without removing?
This topic has 5 replies, has 4 voices, and was last updated by
April 1, 2022 at 7:52 am Trying to remove bottom mounting bolt without Ā snapping it off. Access is tough and seems to be frozen. Do you think I could get the core out and back in while still mounted? I have tried heat, penetrating oil etc. Anyone ever attempted this? I have been working on the large bolt bottom. There is also a set of smaller bolts on the same bracket which seem to be also stuck
5 RepliesApril 17, 2022 at 6:49 pm Sounds to me like Nev R Seez was not used.Ā Ā Ā It does not burn off.Ā Ā The oil carrier may do that but the metal the carrier carries will be there years laterĀ even in a HOT application.Last Post by:
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Loud squeal during start up. 6bta 330
This topic has 3 replies, has 3 voices, and was last updated by
April 4, 2022 at 7:47 pm I just purchased a 33 tiara Powered by 330 diamonds. We are having a weird starting sound that almost sounds like a hydraulic pump squeal or screeching sound. We also took off the belt to see if the tensioner was causing the sound and no change. I am only getting the noise when the started is engaged. Previous owners had a mechanic inspect flywheel and replace starter and no change. The sound is coming from the back of the engine. Also the oil l…
3 RepliesApril 17, 2022 at 6:35 pm If the noise occurs only when the starter motor is engaged then maybe it is the starter motor. Likely a bearing on the shaft is failing.Ā Ā which could allow the armature to shift and contact the inside of the stator. Have you actually gone down and looked and listened as a helper cranked the starter? Just a couple seconds. Regardless, pull it and try the test on the bench or just get it rebuilt if indeed the starter turns out to be the culprit.ĀLast Post by:
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6CTA Turbo Availability
This topic has 1 reply, has 2 voices, and was last updated by
2 years ago
April 16, 2022 at 5:22 pm regarding the turbo for a 6cta 450, I can see that seaboard lists them as out of stock…and so does everyone else!Ā I guess this is somehow a covid thing? Does anyone know how to get your hands one?Ā Is there any estimate for how long I would have to wait if I placed an order for one today?
1 ReplyApril 17, 2022 at 5:01 am I recently needed a new after cooler for my 480CE engine.Ā My local Cummins dealer did not have any either at their facility or any other authorized dealers.Ā Their computer system does notĀ check independent Cummins dealers like Sea Board.Ā Cummins told me it would take about 84 days after placing the order to get one but there were times when parts would come in much earlier than that.Ā Tony did have the cores available but not the housings so…Last Post by:
posted: 2 years ago
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6bta Start Solenoid
This topic has 5 replies, has 4 voices, and was last updated by
2 years ago
April 11, 2022 at 1:52 am Hi, I believe we have an intermittent issue with our start solenoid. Key activates power to dash/alarm panels. Eng will not start via push button at upper or lower station. Bridged terminal at mag switch with no response. Bridged terminal on start solenoid and engine fired. This occurred approximately 2 years ago on a few start attempts but had not reoccurred until now. Gear box is an IRM220 and I donāt believe there is a neutral safety switch i…
5 RepliesApril 16, 2022 at 8:39 pm Thanks everyone for your replies. We have since discovered what we believe to be a neutral safety switch wired to the gear shifters (Morse) at the lower helm. This could be the culprit and will attempt to inspect for corrosion etc at some stage. As for the mag switch and solenoid, I would have thought that if you bridged the contacts at the mag switch first with no response and then got the engine to fire by bridging the solenoid second, that …Last Post by:
posted: 2 years ago
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1969 v-470-m twin Cummins
This topic has 4 replies, has 3 voices, and was last updated by
2 years ago January 3, 2021 at 9:45 pm We bought this boat just over a year ago and it was running great until this summer. We had no issues all the way from Prince Rupert to Winter Harbour. Then on a little trip the port motor overheated. This was in August, its now January. We’ve had 12 different mechanics all give their opinions and hired one mechanic to troubleshoot and do repairs. Unfortunately, after the mechanic we hired pressure tested the head (all good), replaced…
4 RepliesApril 16, 2022 at 8:22 pm What can I say other than old “Heavy Iron” wins over “Marine Age” in this case……………………………. They just do not make them like they used to………….All is good..Last Post by:
posted: 2 years ago
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6cta 8.3 Turbo oil drain tube replacement
This topic has 1 reply, has 2 voices, and was last updated by
2 years ago
April 13, 2022 at 3:18 pm Do I have to drain the oil in the engine or can this part ( turbo oil drain tube #3918499) be replaced with out draining?
1 ReplyApril 14, 2022 at 10:55 am I have the same engine and I changed mine without any draining of the engine oil. Easy job.Last Post by:
posted: 2 years ago
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Fuel Additive/Fuel Tank Polishing
This topic has 4 replies, has 4 voices, and was last updated by
2 years ago April 4, 2022 at 8:25 pm Just did my annual maintenance and my 10 micron filters were BLACK.Ā Obviously I’ve got some algae in the tank.Ā Any recommendations on an additive?Ā A biocide like Bioguard? Anyone ever do the fuel polishing?Ā I’m assuming they just run the fuel through a filter and not really clean the tank.Ā Any thoughts would be appreciated.Ā
4 RepliesApril 13, 2022 at 8:31 pm Years ago, I had a Riviera 43 (99 model) and set up a fuel polishing system as per the attached photo.Ā Basically two 3-way valves and a circulating pump.Ā Also, I once had the opportunity to see inside the fuel tank of a 43 (someone else had cut one open to make it larger) and I noticed the fuel supply came from the forward bottom of the tank and the fuel returns had internal pipes leading from the forward top of the tank to the aft of the tank…Last Post by:
posted: 2 years ago
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6CTA 480CE exhaust question
This topic has 1 reply, has 2 voices, and was last updated by
2 years ago April 13, 2022 at 10:32 am Port engine just rebuilt , replaced both heads and aftercoolers . Start up and run very well wot at 2680 . At idle and after fully warm have light whitesh smoke with strong fuel smell. Any suggestions ? Possibly injectors .It is on both engines. Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā
1 ReplyApril 13, 2022 at 4:33 pm Exactly how are you getting your engines “fully warm”?Last Post by:
posted: 2 years ago
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2007 QSC 8.3 500 boost &oil pressure problems
This topic has 1 reply, has 2 voices, and was last updated by
April 11, 2022 at 7:36 am Had boat hauled for bottom paint. Run home Iām was doing 2120 rpmās and looking down on my gauge scan and saw oil pressure 70 psi on port motor and 37 psi on boost. Ā Starboard was 48 oil psi and 26 psi boost which is typical numbers. Ā At idle I was still showing 15psi boost and 15 psi higher oil pressure on oil pressures. Ā Engines ran great, no smoke, no temperature changes and very smooth. Ā When I returned to dock, I shut down engines and res…
1 ReplyApril 13, 2022 at 7:23 am No replies yet? I would check the wiring first.Ā All connections that they are clean and tight.Ā Ā Plug/socket connections opened carefully and sprayed with something like Corrosion X .Ā THe pins can be wiped gently with a pencil eraser.Ā They will clean oxidation off without damaging the coating .Ā When plugging back in the wiping action between the pins and sockets will also help. Poor connections will produce resistance which will affec…Last Post by:
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Warming engine on trailer
This topic has 3 replies, has 2 voices, and was last updated by
2 years ago April 11, 2022 at 10:52 am Hi guys, my boat is a 1995 Albin 28TE, itās got a 250 hp 6bta. We donāt Ā have a slip yet, probably another 2 years. Iāve read Tonyās articles and procedure for fresh water flushing the engine with the seacock left open. This is the route I plan to go with the flushing when the boat is in the water. My question is how can I accomplish the flush while the boat is on the trailer? Is it the same order of operations or do I need to make an adjustment…
3 RepliesApril 12, 2022 at 4:19 am Your strainer is under the rear deck hatch, right?Ā Rather than use the fresh water flush connection on the strainer, remove the lid and stick the hose in the strainer with the seacock closed, the system will fill and when full will simply overflow the strainer (some clean fresh water in the bilge, so what), start the engine when itĀ begins to overflow from the strainer top.Ā You’re on a trailer so the garboard drain should be out to let a…Last Post by:
posted: 2 years ago
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Unable to start my Cummins QSB 230 HP 2011 model
This topic has 4 replies, has 3 voices, and was last updated by
2 years ago
April 4, 2022 at 3:54 am Hi After replacingĀ my start battery, the engine will not start, and I get errors on my Vessel view. DRVP input low. Emergency stop error. I checked round and found the Battery Man, had not connected the negative cable for the engine start circuit, only connected the through negative for the Thruster Batteries. I have now connected it correctly, but the engine will still not start, and gives me the error codes above. What is DRVP ?? Would appr…
4 RepliesApril 12, 2022 at 2:43 am Found the fault before the mechanic came out, faulty emergency stop switch. All good now, thanks guys.Last Post by:
posted: 2 years ago
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Cummins 6CTA 480 Diamonds – Surging on startup
This topic has 4 replies, has 3 voices, and was last updated by
2 years ago January 12, 2018 at 7:42 am I could use some help…. (2004 Cummins 6CTAs 480 Diamonds – 1100 hours) One of my engines is surging on startup – fluctuating between 650-750 RPMs for about 10 minutes until its warmed up. I’ve heard of the infamous problem with these engines requiring the fuel injection pump to be rebuilt, but from the sound of things, that needs to be done on engines that are surging all the time….. Im baffled by the fact that my p…
4 RepliesApril 11, 2022 at 9:02 am I know this is an old thread but I am curious what the fix was?Last Post by:
posted: 2 years ago
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How to adjust early style QSB 5.9 v-belt tensioner bracket
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