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- Cummins Marine Forum Topics
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QSC 540 water heater connections
This topic has 5 replies, has 4 voices, and was last updated by
11 months ago
March 17, 2020 at 6:27 pm Guys, I have a 2006 Sea Ray 48 with QSC 540’s installed. The water heater for the boat is not connected to the engine to heat it up without using the electrical to heat the tank. The stock heater has the provision but Sea Ray I guess chose not to hook it up. Is there a place on the QSC to tap for hot water to travel through the water heater coil and then back out? Thanks for the feedback.
5 RepliesJune 6, 2023 at 1:55 am The article shows the location of the ports, can someone help me with the thread sizes please. Also is there any need for a thermostat to regulate the hot water to the tank? ThanksĀLast Post by:
posted: 11 months ago
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Oil leak at turbo on 6BTA
This topic has 7 replies, has 4 voices, and was last updated by
11 months ago
May 4, 2023 at 6:13 pm I have a small amount of oil coming out of the aluminum turbo housing that the air filter attaches to. Ā Appears to be coming out at the gap in the large “snap ring”, Ā This is happening at my Starboard engine, the port engine turbo is leaking a extremely small amount of oil. Ā No drips on either side, just a small “spray” causing spots as the photos show on the Starboard engine turbo. Ā Removing the air filter and looking in…
7 RepliesJune 5, 2023 at 4:37 pm Hey Rob – I didn’t want to leave you hanging so here’s a quick update –Ā After running a full offshore trip the oil spatter issue seemed to clear itself up.Ā Prior to the trip I cleaned everything up externally – 5 hrs roundtrip at 2200 and 8 hours on the troll – still clean when I got back to the dock.Ā I’ve continued to monitor on the past couple of light cruises and still no oil spatter.Ā ĀLast Post by:
posted: 11 months ago
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Raw Water pump removal-Cummins 6cta8.3, 480
This topic has 3 replies, has 4 voices, and was last updated by
11 months ago
June 1, 2023 at 1:39 pm I have twin Cummins 6cta8.3, 480 in a 2003 Sea Ray 390 MY unfortunately with the Sherwood pumps. All good so far, but I am going to be replacing the impellers soon. The Port pump is very difficult to access and I’ve read on this forum to simply remove the entire pump assy with gear from the engine. Do I need to be concerned about oil running out? Any advice or tricks to removing and re-installing? Do the gears line up easily?
3 RepliesJune 5, 2023 at 5:25 am I find it very hard to believe removing & re-installing the pump could possibly be easier than just swapping the impeller.Ā The Sherwood impeller has threads built into it to allow you to use a common hardware store bolt to facilitate removal, no custom tool needed. I would also recommend against replacing things ‘just because’–that will get expensive fast.Ā If the pump is working fine, no leaks, etc, let it be.Ā There will…Last Post by:
posted: 11 months ago
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480 CE Coolant leak – not a hose
This topic has 10 replies, has 5 voices, and was last updated by
11 months ago February 15, 2023 at 12:33 pm Think I finally found source of coolant leak on 2005 480 CE.Ā My question…if coolant leak source is the coolant pump, is it safe to go home 700 miles as long as I keep coolant topped off?Ā Or is leak likely to get much worse? Leak is about 1/2 pint an hour.Ā Ā Once home, I can get my local mechanic to do the repair.Ā <br /><br /> Ā I put paper towels around hose just above circled area leak and they are dry, so leak is not coming …
10 RepliesJune 3, 2023 at 3:56 pm So before I started into changing my fresh water pump I sprayed the front end with wd .the squeal went away and stayed away after running for a while.This led me back to maybe a hose . I wrapped all the hoses in the area in paper to see if any blue antifreeze shows up.If nothing shows up there Iāll try to get something under the fresh water pump.This may be hard to do due to access.Any other suggestions appreciated.BillĀLast Post by:
posted: 11 months ago
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Cummins 480CE Props with New Heads?
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This topic has 24 replies, has 6 voices, and was last updated by
11 months ago February 26, 2023 at 8:46 am Good morning everyone, Ā Good morning everyone, Ā I have a 2005 Sea Ray 420 Sundancer with the Cummins 480CE engines. Before last season I had the heads replaced, after cooler cores replaced, Ā new injectors, new water pumps installed, and new turbos being installed this spring. Iāve done all this as a ā1000 Hour Serviceā process as well as to eliminate the ādropped valveā issue. While running on my existing props the fuel burn was below the curv…
June 3, 2023 at 5:01 am 250watt oil pan heaters.Ā When we had the heads installed, we had the mechanic put them on since he was down there.Ā They run on 110AC.Ā Shorepower.Ā I have an outlet in the engine compartment that is on the bulkhead right above our battery box.Ā I plug them in there.Ā I typically let them run about 24hours(or more if possible) and they warm the engine from the bottom up.Ā They heat the underside of the oilpan so the heat conducts up the whole e…
24 Replies
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posted: 11 months ago
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QSB 5,9 hunting with load
This topic has 3 replies, has 2 voices, and was last updated by
11 months ago
May 14, 2023 at 12:40 pm I recently bought a 2007 model cabincruiser with a QSB 5,9 425 hp.Ā 550 running hours.Ā After running the first few hours I noticed the engine was sputtering a little bit. Could only feel it when the sea was flat.Ā The rpm was steady. I tried replacing the Racor filter but still the same issue. The filter on the engine was recently replaced. I called the previous owner and he said it was cavitation from the propeller, not sputtering. But he said…
3 RepliesJune 1, 2023 at 10:57 pm Looks like the issue was the Injection valve no.1. will replace it next week.Ā Anyone knows what the Accelerator pedal or lever position sensor 1 fault means?Last Post by:
posted: 11 months ago
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Turbo Coolant Feed Pipe: "slop" normal?
This topic has 4 replies, has 4 voices, and was last updated by
11 months ago
August 18, 2017 at 8:39 pm I’ve bought a set of new engine hoses from Brad for my 6BTA 370, including a turbo coolant return hose. On installing this, I found some ‘slop’ or wriggle in the “water transfer tube” (CN # 3897088) this hose slips onto at the engine end. Looking at a QuickServe diagram, I can see that this tube is held in with a clamp and O-ring. The clamp nut is tight-as and there is no sign of a leak. Can someone tell me if …
4 RepliesJune 1, 2023 at 11:21 am Hello , and thanks for this forum, Does Tony’s answer apply to my 6BTA 250HP? I changed Turbo coolant return hoses on both engines.Ā The Stbd was tight but no problems. The port hose was really tight, and even with heat and soap it took a lot of force. It Stull was only needed another 1/2 inch to be perfect when the return pipe moved and exhibits this slop.Ā The retainer bolt is tight. I am thinking of removing it and repla replacing the O…Last Post by:
posted: 11 months ago
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low oil pressure alarm.
This topic has 1 reply, has 2 voices, and was last updated by
11 months ago June 1, 2023 at 4:46 am HI, guys, I am using a SMXĀ Low Pressure Alarm Panel & Gear Low Pressure Alarm Switch. The Engine Is A 1989Ā CumminsĀ 6BT . 210 hp @2600 rpm. cpl# 0742. Can I tee it inĀ the oil pressure gauge sender. This is the only port available .Ā Ā Thank You, Rocket JS.
1 ReplyJune 1, 2023 at 5:02 am The 6BTA has three oil pressure ports. How many are in use already? Ā I suppose one for OP sender and one for the Low Oil Pressure switch. Leaves with one spare. It requires an adapter to make the proper thread though. Tranny normally has its own location somewhere on the tranny or tapped into a fitting so this is a separate issue.Ā <br />T can be used if needed.ĀLast Post by:
posted: 11 months ago
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6CTA 8.3-M3 Blow by
This topic has 1 reply, has 2 voices, and was last updated by
11 months ago May 31, 2023 at 9:25 pm Heard thereās an oil additive that can fix minor blow by. Anyone know the name of the product?
1 ReplyJune 1, 2023 at 4:36 am For an old set of diesels in my boat a number of years ago before I repowered with my 6BTA 370ās.Ā <br />Restore oil additive. Seemed to reduce oil consumption and blow by for my old 200 hp V-8 diesels. Others seem to rate it pretty well also. I was told by my long standing mechanic to give it a try.Ā <br />these were not terrible oil burners 1-1/2 qt per 100 hours. Cut it back about 1/2.ĀLast Post by:
posted: 11 months ago
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Cummins 6bta 330hp leak
This topic has 5 replies, has 4 voices, and was last updated by
11 months ago
May 30, 2023 at 10:23 am Hi i have two cummins 6bta 330 hp Engines. From year 1997 with 2200 hours. starboard engine have started to leak in the back of the engine. Looks like oil/water, not sure.Ā Could this be headgasket? Engine runs well, oil and water is good. hope it is not urgent, so I can drive the boat this summer. see pictures BR Thomas
5 RepliesJune 1, 2023 at 2:39 am Have a look at the airsep checkvalve, if it hasn’t been serviced and the system is blocked oil will be forced out of the breather (red arrow) the checkvalve will located in the blue return line to the sump. Some info here (2nd paragraph) http://www.sbmar.com/articles/crankcase-ventilation/ More info here http://www.sbmar.com/articles/envirovent-crankcase-ventilation-ccv-for-cummins-marine-diesels/Last Post by:
posted: 11 months ago
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Wife going to kill me
This topic has 9 replies, has 5 voices, and was last updated by
11 months ago
May 25, 2023 at 6:37 am HELP!! Been having lots of work done on the boat pre -season – weather glorious – first time this year (its the UK) Engines serviced 3 weeks back – have returned to the boat inserted keys and got Smartcraft DTS throttles ‘flashing neutral’ so naturally CCM Autopilot unavailable and Joystick unavailable –Ā No clue where to start unless maybe a GPS issue ? – wife thinks going away for long weekend – …
9 RepliesMay 31, 2023 at 9:09 am In a Galaxy far far away….. So 10 pin harness back of VV1.5 has a dead live – found this out by switching screens – works fine lower helm – $3,000 saved. purple wake wire 12vĀ trace back to 10 pin harness plug into J box upper helm – dead live – now need to find the fault on the live between the plug into the J box and all the way back to the VIP in engine room via lower helmĀ Could not have got this fa…Last Post by:
posted: 11 months ago
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Fusing starting Battery
This topic has 9 replies, has 6 voices, and was last updated by
11 months ago
May 23, 2023 at 6:09 am Redoing my starting circuit and was wondering if anyone is installing fuses on the starting batteries. I am switching from 1 4d battery that was used to start both motors to 2 group 31 deka agm batteries with 2/0 awgĀ for both grounds and positives.Ā Ā Should have said this earlier this is for 2 Cummins 6bta 370hp motors.Ā If a fuse is recommended what size?Ā From what I read it is recommended to fuse the circuit with the max wire amps wh…
9 RepliesMay 31, 2023 at 6:23 am After reading the comments and doing a little more research I plan to either use an ANL fuse or like Tont stated an on off switch that is easily accessible in case of an issue.ĀLast Post by:
posted: 11 months ago
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Cummins 6BTA 5.9-M1 abruptly shuts down while underway
This topic has 5 replies, has 2 voices, and was last updated by
11 months ago May 30, 2023 at 6:51 pm Hi there,Ā First this community is awesome and super appreciate all the info.Ā Ā Yesterday we were headed out fishing and when we were 5 miles outside of the harbor and at cruising speed the engine abruptly shut off.Ā Ā We heard what sounded almost like a release of pressure and thud.Ā Ā All of the pressure and temperature gauges were reading normal and when we went back and looked at the Engine, it looked completely fine.Ā Ā No leaks of anything, b…
5 RepliesMay 30, 2023 at 8:36 pm Also, I should clarify after the engine shut down and we visually inspected it and determined nothing was leaking or overheating, the starter engaged and tried to turn the engine but the engine would not turn. Ā ĀLast Post by:
posted: 11 months ago
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Another 4bt overheating issue
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This topic has 24 replies, has 3 voices, and was last updated by
11 months ago April 30, 2023 at 12:04 pm I just took my boat out for a test run after upgrading the cooling system. Ā Iām having overheating issues, and looking for suggestions. Ā I installed: larger expansion tanks, new heat exchangers, new impellers, all new hoses. in the lower elbow that attaches to to the water tube, that attaches to the expansion tank, I installed a 3/4 elbow that goes to the expansion tank, and a 1ā elbow with a 1ā hose that goes to the rear of the block at the cas…
May 30, 2023 at 7:01 pm I am propped at 17X16 with a slight cup.Ā I hit 3000RPMĀ “EASILY” I played around for a few seasons and 17X17 was close but they were originally 18X18Ā but would not give me what I needed.Ā Going with new props for me was the way to go 24 Replies
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posted: 11 months ago
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EGT probe Installation
This topic has 3 replies, has 3 voices, and was last updated by
11 months ago
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…
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:
posted: 11 months ago
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Low fuel pressure
This topic has 1 reply, has 2 voices, and was last updated by
May 27, 2023 at 4:14 pm <li style=”list-style-type: none;”> QSC 8.3, 2010, new after coolers installed. When reducing throttle from wide open 2580 Rpm, to around 1500 rpm the port engine shows a low fuel pressure warning. Turning the engine off Ā and back on eliminates the warning. Bringing throttle to wide open and then reducing causes the fault to show again. Starboard engine does not do this. could this mean a bad fuel pressure sensor or something…
1 ReplyMay 29, 2023 at 4:56 pm Total guesswork here but it could be a going goofy pressure sensorĀ OR a wiring flaw. Ā Check the wiring first and be sure it is in good shape, tight and clean at all connections. THe other suggestion is get a pressure guage and install it on a TEEĀ in combination withthe pressure sensor.Ā I always use a steel hydraulic fitting in cases like this, not brass and especially not extruded brass.Ā Ā If fuel pressure is going actually goingĀ low then …Last Post by:
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Do I need a new oil cooler?????
This topic has 7 replies, has 3 voices, and was last updated by
May 14, 2023 at 7:42 pm Shortly after I purchased my Luhrs Tournament 350 with twin 6 BTAs, Tony refered to the pics of my engine room as a “War Zone!” Ever since I have spent at least ten times more hours working on my boat than using my boat. After coolers, SMX thermostats, puke bottles. She is coming along, but still has a long way to go. Latest project was to replace the coolant pumps. I didn’t how old they were and wanted to be safe (raw water wi…
7 RepliesMay 29, 2023 at 4:37 pm Phone them OR Email them. When you phone have the engine model number and serial number at hand.Ā They likely will need those to identify which engine so the right cooler is obtained.Ā Ā Not everything is on any site.Ā Ā I doubt oil coolers are a high replacement item unless they are seawater cooled. Even then a well built cooler may last 20+ yrs with only a seal replacement.Ā Many engines oil coolers are coolant cooled which require even less at…Last Post by:
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Coolant and alarm sender
This topic has 15 replies, has 4 voices, and was last updated by
11 months ago May 21, 2023 at 5:23 pm Guys: Is the temperature sender to the gauge a different sensor than the temperature sensor to the alarm? The sensor I found has Ā 2 tabs/2 wires, Ā I presume this is to complete a circuit? Ā Or am I wrong and they are grounded and one is for the alarm and one for the gauge sender? the reason I ask is my alarm is going off, Ā the gauges show appropriate readings, so I am troubleshooting the sensors. oil pressure checked out. this system has t…
15 RepliesMay 27, 2023 at 4:51 am Most fittings points are 1/2″ NPT so you would either need a bushing adapter or get the appropriate 1/2″ sender or switch.Ā I am not aware of any 3/8″ locations on most engines.Ā Usually either 1/4″ or 1/2″.Ā Asapters are needed for anything else.Ā Oil is usually 1/8″ NPT or sometimes Metric.Last Post by:
posted: 11 months ago
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Failed after cooler core
This topic has 2 replies, has 2 voices, and was last updated by
11 months ago
May 26, 2023 at 10:00 am Twin QSB 5.9, 380 hp.Ā I ran my boat down the east coast to Florida.Ā Near the end of the trip, the starboard engine exhaust showed black smoke above 1800 rpm.Ā Assuming it was a rich condition, I cleaned and replaced the air sep filter and oil separator filter, drain and piping, checked the turbo etc. no improvement.Ā I finally pulled the after cooler and removed the core to find this mess (see pic). The core was destroyed and possibly, probabl…
2 RepliesMay 26, 2023 at 11:10 am Tony first off, thanks a for responding, and doing so, so quickly.Ā And yes, from the looks of the aftercooler core, this has been going on for a long time. The boat is a 2005.Ā I bought it in 2017 and had the after coolers serviced at purchase by Cape Cod Marine (a certified Cummins shop).Ā I saw the service work in process, disassembled, cleaned, plenty of the recommended grease.Ā Around three years ago, I serviced them myself using the same p…Last Post by:
posted: 11 months ago
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2004 6CTA 480CE M-4 valve seat failure avoidance
This topic has 7 replies, has 3 voices, and was last updated by
11 months ago May 15, 2023 at 11:51 am I recently purchased a 2004 Sea Ray 390 MY with 6CTA 480 engines with 800 hours on them. Ā The potential of a catastrophic engine failure due to valve seat failure is concerning to me. Ā I am a little out of my comfort zone with this issue. Ā It appears I have two options: replace the heads with the new, upgraded model, and/or re-pitch the props. Ā Ā Other owners of these boats have not replaced the heads, but only had their props re-pitched from 24 …
7 RepliesMay 22, 2023 at 6:23 pm Yes the heads were the same and that’s is why the higher HP versions had a bad history of valve failures… Then newer heads were designed / upgraded a few years ago, and are the ones you want to use for either version of the 6CTA’s.Ā IMO, $$ well spent proactively..ĀLast Post by:
posted: 11 months ago
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QSC 540 water heater connections
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