Cummins Marine Diesel Repower Specialists Forums Cummins Marine Engines

This forum contains 523 topics and 3,254 replies, and was last updated by  Mike Mason 7 hours ago.

Viewing 20 topics - 1 through 20 (of 523 total)
    • Cummins Marine Forum Topics
    • Coolant type ( blue)

      This topic has 2 replies, has 2 voices, and was last updated by Mike Mason 7 hours ago

      April 17, 2018 at 9:17 pm Need to top off my coolant. What is the fleetguard type coolant I need to get? Current coolant is blue. Thanks. Mike.

      Started by:  Mike Mason


      2 Replies
      Reply #2 April 18, 2018 at 9:11 pm Thanks Tony.

      Last Post by:  Mike Mason posted: 7 hours ago

    • Coolant hose trouble

      This topic has 1 reply, has 2 voices, and was last updated by Rob Schepis 14 hours ago

      April 18, 2018 at 10:42 am I ordered some new hoses from Seaboard to change out old ones while I was performing maintenance on the aftercooler and heat exchanger. All the hoses are good except I am having trouble getting the 0.75″ expansion tank coolant hose (item #10 from website) on the lower fitting. It fits the top fitting fine. I’v tried dishsoap and also heating the hose with hot water but cannot get it more than maybe a 1/4″ on. Are there any ti…

      Started by:  Ron Pickering


      1 Replies
      Reply #1 April 18, 2018 at 1:57 pm This hose/fitting? Can you share some pics of what you are dealing with? Any chance someone changed out that lower fitting from the stock one? Heat and lube, as you have already tried, is the usual ticket.. Rob "Luck is the residue of good design." Attachments:You must be logged in to access attached files.

      Last Post by:  Rob Schepis posted: 14 hours ago

    • Oil accumulation in air filter

      This topic has 13 replies, has 5 voices, and was last updated by Dave Galehouse 17 hours ago

      April 2, 2018 at 1:57 pm Hello, I have two 6c8.3 Cummins engines in my boat (boat is a 2005). Boat was new to us last year. I started to notice some small amounts of oil accumulation in the air filters during the summer. I don’t have a ton of history on the boat maintenance wise, but the oil samples at survey came back good and the boat runs very well with no issues. I came across this article which seems to describe issues with the B series engine, but I was tryi…

      Started by:  Dave Galehouse


      13 Replies
      Reply #13 April 18, 2018 at 10:41 am Tony, we purchased this boat last winter from a person in Connecticut who only owned it one season. We don’t have a ton of history on it maintenance wise, but my broker knows the previous owner before the CT owner and we were told he took good care of the boat and that money was never an issue. I am in the process of trying to track down some maintenance records. I have a Cummins certified mechanic going through it in the next few weeks an…

      Last Post by:  Dave Galehouse posted: 17 hours ago

    • Potential fuel filter issue

      This topic has 3 replies, has 4 voices, and was last updated by Tony Athens 22 hours ago

      April 17, 2018 at 4:39 am I’m in the process of modifying the filters on my boat, to a 2 stage system, per the “filtration the Seaboard way” article in Tony’s Tips. I’ve mentioned it to a couple of knowledgeable diesel guys, and they caution against it, due to the possible restriction of flow feeding the injector pump. My boat has 2) 6BTA 5.9 M3 engines with mechanical injector pumps (factory reman in 2007, with about 900 hours on them). …

      Started by:  Lars Larsen


      3 Replies
      Reply #3 April 18, 2018 at 6:17 am No offense, but your knowledge-able diesel guys are clueless.. So much bad info out there. It all come down to?measured restriction, not a seat of the pants opinion, or typical dock talk.. . As to the actual filters–Use the FS1000 instead of the FS 19516 ( kinda pricey and not needed for your engine as it has a WIF sensor on it) .. Use 1/2″ lines to and from the filters As to sending fuel to the engine–You should always send …

      Last Post by:  Tony Athens posted: 22 hours ago

    • Battery Question

      This topic has 6 replies, has 6 voices, and was last updated by George Forrer 1 day ago

      April 16, 2018 at 11:04 am Hi Guy’s I am looking at changing my 8D batteries. They are in a bad spot and to heavy for me to be dragging around. I was thinking about 4D’s or wiring two group 31’s together? The motors are QSC 8.3. Does anyone have any suggestions on what is the better way to go. The generator and battery charger are on the whole time the boat is away from the dock. Thanks George

      Started by:  George Forrer


      6 Replies
      Reply #6 April 17, 2018 at 7:34 am Thanks guys for all the input. I think I will be going with the group 31 setup. I think I can manage those the best.

      Last Post by:  George Forrer posted: 1 day ago

    • Fuel filter bracket

      This topic has 8 replies, has 4 voices, and was last updated by paul greenhalgh 1 day ago

      April 7, 2018 at 7:38 pm Hello everybody, so i start install my remote oil filter on my port motor today and i have a clearance problem. The problem is my fuel filter on the port motor is located on the same side as the oil filter with the fuel lines running across where the new remote oil filter will sit I would like to relocate my fuel filter to the other side of the motor as shown in the pictures that Tony has on this site of the fuel line locations I’ve been s…

      Started by:  Sean Connolly


      8 Replies
      Reply #8 April 17, 2018 at 6:19 am Thanks Sean. I’ll send you a private msg.

      Last Post by:  paul greenhalgh posted: 1 day ago

    • QSM11 Dry Exhaust Slip Joint

      This topic has 0 replies, has 1 voices, and was last updated by Will 2 days ago

      April 16, 2018 at 8:22 am What seals the slip joint in the QSM11 Dry Exhaust system, it looks like in the Cummins manual on quickserve they show some type of insert/seal, but its no where to be found in the parts diagrams? Is it sealed immediately when the manifold is installed, or does it have to run a few hours and blow a little soot to seal up? Can you use something like Fuchs 762 / Silkalene on the slip joint?

      Started by:  Will


      0 Replies
      Reply #0 April 16, 2018 at 8:22 am What seals the slip joint in the QSM11 Dry Exhaust system, it looks like in the Cummins manual on quickserve they show some type of insert/seal, but its no where to be found in the parts diagrams? Is it sealed immediately when the manifold is installed, or does it have to run a few hours and blow a little soot to seal up? Can you use something like Fuchs 762 / Silkalene on the slip joint?

      Last Post by:  Will posted: 2 days ago

    • QSM11 Ceramic Coating of Exhaust Manifold

      This topic has 0 replies, has 1 voices, and was last updated by Will 2 days ago

      April 16, 2018 at 8:16 am On the QSM11 Dry Exhaust manifold, is there any reason not to have the exterior portions of the exhaust manifold and exhaust side of the turbo coated w/ JetHot’s extreme heat 2500 degree ceramic coating to help push that heat on out of the exhaust system into the mixer instead of so much heat staying in the engine compartment?

      Started by:  Will


      0 Replies
      Reply #0 April 16, 2018 at 8:16 am On the QSM11 Dry Exhaust manifold, is there any reason not to have the exterior portions of the exhaust manifold and exhaust side of the turbo coated w/ JetHot’s extreme heat 2500 degree ceramic coating to help push that heat on out of the exhaust system into the mixer instead of so much heat staying in the engine compartment?

      Last Post by:  Will posted: 2 days ago

    • 480CE overpropped- what to tell prop shop? 1 2

      This topic has 27 replies, has 5 voices, and was last updated by Nicholas Cummings 2 days ago

      March 25, 2018 at 8:25 am I’ve finally managed to get some visibility into my fuel burn numbers and from looking at Tony’s articles on propping the 480CE I can tell I’m overpropped. Looks like I need to reduce the fuel burn for each engine by about 2gph at 2200 RPM. Do ya’ll have a suggestion for how much pitch to have taken out to remedy the situation? They are 4-blade props (photo attached). Here are my numbers, measured with 4 people on boa…

      Started by:  Nicholas Cummings


      27 Replies
      Reply #27 April 16, 2018 at 6:24 am I went ahead and got numbers at WOT this weekend to go along with the cruise data I posted earlier. The variation was from going two different directions with regards to 25 kt winds and 3′ wind chop. Also my displays only show RPM in increments of 50, so I suspect it bouncing back and forth between 2650 and 2700 was indicative of the engines holding at the governed 2670 RPM max. Port: 2650-2700 RPM, 23.8-24.5 gph, 90-95% load , 29 psi bo…

      Last Post by:  Nicholas Cummings posted: 2 days ago

    • Pencil Zinc Install

      This topic has 13 replies, has 8 voices, and was last updated by Rob Schepis 2 days 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.  Having taps of each size in your “zinc kit” is a good idea so you can chase those threads clean.  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 coo…

      Started by:  Rob Schepis


      13 Replies
      Reply #13 April 16, 2018 at 6:02 am Hi Rob First time seeing this post – so thanks… I too have had an issue with HX zinc lengths.. on one of the 2 engines – I thought it was crud build up as they are hard to get to on the SB engine without dislocating my wrists… . How much did you cut off? Half inch or so? Steve O Probably good timing that you brought this thread back to the top as it is that comissioning time of the year. Sounds about right as to the cutoffs, here’s…

      Last Post by:  Rob Schepis posted: 2 days ago

    • 6CTA Diamond Engine valve Adjustment

      This topic has 1 reply, has 2 voices, and was last updated by mark gaudy 2 days ago

      April 15, 2018 at 5:16 pm Purchased a 03 Sea Ray Sedan bridge with 500 hours on both engines. The manual says to adjust the valves at 500 hours. Currently they are running well and have 530 hours each. Has anyone completed the valve job themselves? I am a mechanic working on airplanes primarily and was hoping to find out what is required tool wise, parts, any special procedures, and appropriate valve clearances. Thank you, Gavin

      Started by:  Gavin Nagle


      1 Replies
      Reply #1 April 16, 2018 at 5:39 am I also have a Sea Ray 400 with the 6c 8.3 so we are probably talking the same animal, but verify your clearances on the tag on the front cover (by the fuel pump) Intake .012 and exhaust .024. Adjustment is straight forward. No special tools that an aircraft mech won’t have. Metric wrenches, torque wrench, feeler gauges, hex keys. You should be able to reuse the valve cover gaskets, no need to buy any parts. The procedure is outlined in de…

      Last Post by:  mark gaudy posted: 2 days ago

    • timing

      This topic has 0 replies, has 1 voices, and was last updated by john hartnett 3 days ago

      April 15, 2018 at 7:59 pm Im installing my injection pump on my 370 hp 6bta. I pinned the motor at tdc and I pinned pump. my pump timing is 24 before tdc Is the pump at 24 degrees when the pin is in Do I have to do anything more Thanks

      Started by:  john hartnett


      0 Replies
      Reply #0 April 15, 2018 at 7:59 pm Im installing my injection pump on my 370 hp 6bta. I pinned the motor at tdc and I pinned pump. my pump timing is 24 before tdc Is the pump at 24 degrees when the pin is in Do I have to do anything more Thanks

      Last Post by:  john hartnett posted: 3 days ago

    • Fuel Return Question On Repower

      This topic has 4 replies, has 3 voices, and was last updated by Mike P 4 days ago

      April 12, 2018 at 3:25 pm I am in the process of repowering a gas boat to Cummins 370’s. The boat has two tanks, one on the outboard side of each engine. The existing plumbing utilizes a manifold system so that either tank can supply either engine. I like being able to occasionally switch from one tank to the other in order to maintain equal amounts of fuel in each tank. I realize I will need to make a new manifold system that can handle more fuel flow. My tho…

      Started by:  Mike P


      4 Replies
      Reply #4 April 14, 2018 at 7:57 pm Thanks Tony, I have read that and will remember it.

      Last Post by:  Mike P posted: 4 days ago

    • Coolant valves risk?????

      This topic has 1 reply, has 2 voices, and was last updated by Tony Athens 5 days ago

      April 13, 2018 at 3:58 pm I was in my engine room and doing some cleaning and painting, general checking for leaks. Recently we had to take the starboard Turbo off for replacement of exhaust elbow, that described in a different thread. While looking around, I noticed that the valves which controlled coolant flow to my coolant filter were closed. That had been done I expect to lower the coolant (Not done by me, done by my mechanic). My question is; if I’d run th…

      Started by:  james


      1 Replies
      Reply #1 April 13, 2018 at 5:47 pm The two small coolant valves only allow a slow flow thru the Coolant filter.. Closed or open, will not affect anything to do with engine temps.. If it makes you feel better, they eliminated the filter all together on the QSC.. Personally, and from 25+ years of dealing the the 6CTA, I’d have no issue eliminating it as long as you check coolant makeup every few years/ 2000 hours ( which you should do anyway) .. With the mid-stop liners in…

      Last Post by:  Tony Athens posted: 5 days ago

    • Fuel Line Size to/from on-engine filter

      This topic has 2 replies, has 2 voices, and was last updated by Paul Greenhalgh 6 days ago

      April 10, 2018 at 9:45 pm Twin 6BTA 5.9 370’s, Cpl 1975. I have Parker 436-8 hoses from my fuel tanks through my Racors and on to the lift pump. These are 3’6″ long between Racors and the lift pump and have an i.d. of 1/2″ (12.5mm). But the hoses to/from the on-engine fuel filters and the injection pump are Parker 221 FR-8, 4′ 6″ long. This hose has an i.d. of just 13/32″ (10mm). I need to replace the lines between the on-engi…

      Started by:  Paul Greenhalgh


      2 Replies
      Reply #2 April 12, 2018 at 8:51 pm Thanks Rob!

      Last Post by:  Paul Greenhalgh posted: 6 days ago

    • Cummins 5.9BT

      This topic has 0 replies, has 1 voices, and was last updated by John 6 days ago

      April 12, 2018 at 9:02 am Hello: Does anyone know if i can take the turbo of a Cummins 5.9Bt and make it naturally aspirated ? I am looking for a 5.9 B N/A 120 HP @ 2800 Rpm, 12 V , mechanical fuel injection pump . If i do take the turbo it will affect the engine , do i need to recalibrate the pump? My mechanic is telling me it will be ok. Thanks John steel troller

      Started by:  John


      0 Replies
      Reply #0 April 12, 2018 at 9:02 am Hello: Does anyone know if i can take the turbo of a Cummins 5.9Bt and make it naturally aspirated ? I am looking for a 5.9 B N/A 120 HP @ 2800 Rpm, 12 V , mechanical fuel injection pump . If i do take the turbo it will affect the engine , do i need to recalibrate the pump? My mechanic is telling me it will be ok. Thanks John steel troller

      Last Post by:  John posted: 6 days ago

    • 1990 3208TA w/ 2550 hrs: pre purchase questions

      This topic has 9 replies, has 4 voices, and was last updated by Joe Casey 6 days ago

      April 2, 2018 at 7:22 am Looking at buying a 42′ 23,000lb boat with twin 1990 3208TAs. Total hours 2550. WOT of 2650 and 2700 and oil pressure of 39 and 49 psi. Water temp 190 and 180 degrees. Modified V, planing hull. For this engine given the above, what should mechanic who does engine survey look for? Thanks, Otter 36

      Started by:  Joe Casey


      9 Replies
      Reply #9 April 12, 2018 at 8:52 am Tony Thank you for the critical points. Joe

      Last Post by:  Joe Casey posted: 6 days ago

    • 2 micron fuel filter

      This topic has 1 reply, has 2 voices, and was last updated by Philip 1 week ago

      April 11, 2018 at 6:04 pm I have a pair of 6 CTA’s My question is, I want to run 2 micron filters in the Racors, before the filter on the engine. I have vacuum gauges and can monitor them and change when needed. My reason is ,its so much easier to change the Racors, than the engine filters where there is a good chance to loss fuel prime.

      Started by:  Rene Dupuis


      1 Replies
      Reply #1 April 11, 2018 at 6:29 pm Good thought, bad idea. You run a risk of clogging quicker than you can monitor. If your having issues with priming the last chance on engine filter investigate the following: Fuel Filtration Squeeze Bulb Priming on Diesel Powered Boats

      Last Post by:  Philip posted: 1 week ago

    • Belt Tensioner wobble

      This topic has 4 replies, has 2 voices, and was last updated by Jeff Lewis 1 week ago

      April 10, 2018 at 7:32 am I recently purchased an Albin with twin 270hp Cummins 6BTA´s. When I replaced the belts, I noticed that the port engine´s belt was shreddedd. Both engines had significant belt dust present. I cleaned and checked all pulleys and replaced belts. When started, I noticed the starboard engine´s belt tensioner and belt movement was “rock solid”, but the port engine´s belt was “wobbling” and the belt tensioner was”boun…

      Started by:  Jeff Lewis


      4 Replies
      Reply #4 April 11, 2018 at 2:17 pm I’m out of town, but I’ll look next week. It looks the same in pictures (ie the tensioner pulley relation to the alternator and idler pulley seem the same). This wobble is either the cause of or the result of the belt “jumping” or “slapping” between the crank and water pump. As I said before, both of those pulleys run smooth. I tried adding additional tension to the tensioner while the engine was running with mixed results (smoothed…

      Last Post by:  Jeff Lewis posted: 1 week ago

    • 6BTA thermostat

      This topic has 8 replies, has 2 voices, and was last updated by Ron Lemire 1 week ago

      April 9, 2018 at 3:15 pm Greetings I plan on replacing my thermostat on my Cummins 6BTA. ( I’ve replaced all hoses, and cleaned the heat exchanger and the after cooler ) per the instructions on this site. I see Seaboard has 2 different temperature thermostats to choose from. I have a trawler and I typically Cruse at 7 knot’s. The previous owner has a note next to the temperature gauge indicating 170 degrees. ( It typical runs about 160-170 degrees ) What …

      Started by:  Ron Lemire


      8 Replies
      Reply #8 April 11, 2018 at 12:44 pm Thank you very much. Ron R Lemire

      Last Post by:  Ron Lemire posted: 1 week ago

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