Cummins Marine Diesel Repower Specialists › Forums › Cummins Marine Engines

Viewing 14 topics - 3,761 through 3,774 (of 3,774 total)
1 2 3 … 187 188 189
    • Cummins Marine Forum Topics
    • 6BTA5.9 Preheaters

      This topic has 12 replies, has 4 voices, and was last updated byWilliam Walter 7 years ago

      November 15, 2016 at 7:01 pm The mechanic who was previously looking after our engines disconnected the preheaters on the top of the aftercoolers and told me when I asked it was because the engines didn’t need them in our hot climate and they are not good for the alternators. Is this true or should I reconnect them? The other thing is he just disconnected them by taking the leads off the terminals at the preheaters then taped them up. It looks untidy so if they are no…

      Started by: Brett Griffin

      12 Replies
      November 20, 2016 at 6:23 am Thanks for info .i probably won’t use them as a standard practice as the downside seems to heavily outweigh the upside.

      Last Post by: William Walter posted: 7 years ago

    • After cooler

      This topic has 2 replies, has 3 voices, and was last updated byCorey Schmidt 7 years ago

      November 17, 2016 at 6:44 pm What is the purpose of the rubber like strips on the fins of the after cooler? Should they be replaced when servicing the after cooler?

      Started by: Raymond W Smith

      2 Replies
      November 17, 2016 at 10:02 pm Once again, Rob hit the nail on the head… they are worthless! The trashcan is the ultimate destination for those things…

      Last Post by: Corey Schmidt posted: 7 years ago

    • QSM11 prop size

      This topic has 7 replies, has 3 voices, and was last updated byRob Schepis 7 years ago

      November 15, 2016 at 11:58 am Hello all, New to this site. Like many others I have experienced exhaust leak issues on my QSM’s. They are 2003 builds, commissioned in 2004. The data plate hp is stamped 650. Now have 2500 hours. Within the first 500 hours my starboard had leaks and since then there have been three services on the motor, the last being with new manifold and turbo. In the last year my port has succumbed to the same issue, but for some time exhibited very l…

      Started by: Jack Blaisdell

      7 Replies
      November 17, 2016 at 7:31 pm No problem Jack. Ā Finest KindĀ is gorgeous. Ā She just has to raise some fish lookin’ that good! My sportfish also has a sharp entry and flat stern section (even flatter than Finest Kind) making for a very easy planning boat and a super stable platform at anchor or drift..

      Last Post by: Rob Schepis posted: 7 years ago

    • QSM-11 Initial Ignition of Engine

      This topic has 7 replies, has 4 voices, and was last updated byPatrick 7 years ago

      November 9, 2016 at 9:31 am I have 2003 QSM-11 with pretty low hours. When I first turn on the main power to the engine, then turn the key on and wait for its testing routine. I then press the start button, it start then immediately cuts out. If I leave the main power on but turn off the engine and let it sit for a week or so I’ll have the same problem. I then go to the main power for the engine, turn it off, then turn the power and the key back on, wait for the test…

      Started by: Thomas Duggan

      7 Replies
      November 15, 2016 at 6:49 pm Before getting carried away, try replacing the ignition rectifier behind the helm station. Ā No guarantees, but a cheap part to replace known to create odd starting issues. Ā I had odd ignition issues on a 2006 QSB 5.9 that were solved when I replaced the rectifier and verified the connections were good.

      Last Post by: Patrick posted: 7 years ago

    • Suspected Fuel Pump Leak

      This topic has 2 replies, has 2 voices, and was last updated byWilliam Brown 7 years ago

      November 14, 2016 at 11:51 am While on a 14 day trip down the A-ICW we noticed a small diesel leak in the vicinity of the high pressure fuel pump.Ā  It does not appear to be coming from any of the inlet/outlet fittings.Ā Ā  The engine is 6 years old and has 638hrs running time.Ā Ā  AĀ single paper towel placed under the pump could absorb the amount of diesel leaking after an 8 hourĀ run.Ā Ā  Ā  Does this type of leak eventually lead to a catastrophic engine failure?Ā  Should the pump b…

      Started by: William Brown

      2 Replies
      November 14, 2016 at 2:50 pm Tony, thanks for your comments.Ā Ā  I suspect the rust is from a previously failed seawater pump I replaced several hundred hours ago.

      Last Post by: William Brown posted: 7 years ago

    • Winter lay up

      This topic has 2 replies, has 3 voices, and was last updated byTony Athens 7 years ago

      November 13, 2016 at 4:58 am There is discussion on another forum I am on about oil changes for fall decommissioning. Ā I would like for Tony to weigh in if possible. Ā Thanks for this Forum BTW. I have a QSC 8.3 500hp. Ā I average about 110-125hrs per season. Ā ( Was advised to to the following from the mechanic that rebuilt a KAMD42 for me) I change my oil after the boat is launched for the season, change at 100hrs during the season, and change again no matter what the meter …

      Started by: Kyle G

      2 Replies
      November 13, 2016 at 6:32 am Kyle,   I’m on your side…Old school ideas take a long time to go away…..Engine hours, fuel use during those hours versus Ā Oil Pan capacity are the things that should be used to determine oil change intervals.. Changing oil before a winter lay up would only make sense if you were all ready do for one.   Tony

      Last Post by: Tony Athens posted: 7 years ago

    • Heat Exchanger Flat End Cap Fix

      This topic has 2 replies, has 2 voices, and was last updated byRob Schepis 7 years ago

      October 19, 2016 at 9:25 pm Is your heat exchanger cap weeping at the outer perimeter? Ā Is it “flattened” from years of over-tightening? Ā It is important to put the “concave” back in the cap if it has been over tightened over time and flattened. Think of the cap as a big lock-washer as you “snug” it up. If itĀ“s too flat you will crush the center gum washer before putting any sealing pressure on the outer perimeter. Here’s the fix i…

      Started by: Rob Schepis

      2 Replies
      November 13, 2016 at 5:50 am Yes Dan, works well.Ā  Always a good thing when the guy “at-profit” tells you how to fix something rather then selling you a new one..

      Last Post by: Rob Schepis posted: 7 years ago

    • Lost Top RPM's

      This topic has 2 replies, has 2 voices, and was last updated byRaymond W Smith 7 years ago

      November 8, 2016 at 4:23 pm Cummins QSL9-40 Ft. Sedan Trawler. Had prop reconditioned and the boat ran perfect. Couple days later i lost 50 RPM off the top end of 2100 RPM. Checked all fyel lines-Installed a complete new filter. It seems the boat runs nice until it hits about 2050 or 2060 and thats it. Engine & boat is ten years old and well maintained. 450 EH’s. Never had this problem before. Any comments or suggestions. Thanks

      Started by: Raymond W Smith

      2 Replies
      November 11, 2016 at 7:06 am Tony….Problem solved….As crazy as it may sound, the prop was coated with a heavy growth of thick slim. Never ever seen it like this before. I run the boat every week or so. It went from a clean prop to this in about a week or two. Others in the yard are finding the same thing. I have always used the best Micron Extra with the Bio. I did not think it was the prop since i just had it checked and tuned up. Boy was i wrong!!!! Thanks for…

      Last Post by: Raymond W Smith posted: 7 years ago

    • QSC with DTS controls

      This topic has 3 replies, has 2 voices, and was last updated byTony Athens 7 years ago

      November 10, 2016 at 1:14 pm I have a QSC 500 with DTS controls in two stations and want to add a third station. I know that that DTS controlsĀ were limited to just two stations but has that changed? Are there options other than replacing the controls? My harnesses are very easily accessible could I just add the third station and unplug one and use the other?      

      Started by: michael Blanchard

      3 Replies
      November 11, 2016 at 6:37 am That’s why they call him a “salesman”..   Not sure how important is is for you to add that 3rd station, but if you zero out with Mercury, and this is super important and you have the budget, there are options that could replace the entire Mercury Electronic side of your engines, “SMARTCRAP”, and that would give you lots of options.. But it would be expensive, but once you made that move, then you have real long…

      Last Post by: Tony Athens posted: 7 years ago

    • QSB 6.7 550hp

      This topic has 4 replies, has 3 voices, and was last updated byTony Athens 7 years ago

      November 7, 2016 at 10:59 am Quick question…was helping a friend deliver his new boat…powered with twin QSB 6.7 550hp engines and water jets. Ā Had been told to run at 85% load as optimum cruise. Ā That put us at 3,000 RPM…felt too high for me but I have no experience with jet drives…only props. Any suggestion as to where this should be run?   Thanks

      Started by: Bryan Dougherty

      4 Replies
      November 8, 2016 at 6:43 am     An example attached Tony  

      Last Post by: Tony Athens posted: 7 years ago

    • 2006 Cummins QSB 355HP annual costs and other questions….

      This topic has 10 replies, has 3 voices, and was last updated byTony Athens 7 years ago

      November 6, 2016 at 5:57 pm Hey Everyone, IĀ“m looking at buying a Tiara 3200. It is a 2006 and has 475 hours on the engines. These will be my first diesel engines and I was wondering what I should plan for annual maintenance costs? Also, should I be worried about the “marine age” of these engines? They are low time but have been in the salt water for 10 years. I plan on having an engine survey done, but from the sounds of it the oil and transmission samples don…

      Started by: Luke LeBeau

      10 Replies
      November 7, 2016 at 5:24 pm Luke,   It’s really tough to comment on an engine that I do not support…. All I can say is to be sure that you have solid support before you jump, and are prepared to have fewer choices & most likelyĀ  be paying substantially more for that support..   Tony

      Last Post by: Tony Athens posted: 7 years ago

    • Tiara / Pursuit Wet Exhaust Hump Hose

      This topic has 1 reply, has 2 voices, and was last updated byTony Athens 7 years ago

      November 6, 2016 at 9:17 pm Looking to replace the two 6″ I.D. x 7″ long hard black rubber hoses on the wet exhaust with new blue silicone hump hose to reduce vibrations. It looks like I need to take apart the exhaust at the hose as well as the flanged bolted end near the turbos. Need help with part number / availability on the flange gaskets? Thanks, Kevin

      Started by: Kevin Conway

      1 Reply
      November 7, 2016 at 4:34 am http://www.sbmar.com/product-category/gaskets-o-rings/turbo-gaskets-hardware/ Turbo to riser gasket is easy–I prefer the graphite one. If you need the siliconeĀ hump hoses, we have those in stock also. $90 ea including S&H..   Tony

      Last Post by: Tony Athens posted: 7 years ago

    • Exhaust Elbow

      This topic has 2 replies, has 2 voices, and was last updated byRob Schepis 7 years ago

      October 23, 2016 at 7:50 am Mechanic states that once pitting has occurred inside exhaust elbow they are no good.Ā  Can allow seawater to run back into turbo.Ā  Has quoted me a price of $1700.00 each to rebuild old exhaust elbows.Ā  SBMar has the elbows for around 1650.00 new.Ā  Are the SBMar’s elbows a lower grade of stainless than if I were to rebuild?Ā  Are the SBMar’s made in China?  

      Started by: info5

      2 Replies
      October 23, 2016 at 9:25 am info5,Ā  the first two articles on this Exhaust page cover it all.. http://www.sbmar.com/category/articles/exhaust-systems/

      Last Post by: Rob Schepis posted: 7 years ago

    • Heat Exchanger Zinc Length Issue

      This topic has 1 reply, has 2 voices, and was last updated byNoSpeed 7 years ago

      October 19, 2016 at 9:43 pm The later style Champ heat exchanger (offset inlet/outlet) appears to have a zinc length issue which is confirmed by some and negated by others. Ā Strange that the feedback differs but I can only speak to my findings. Ā My heat exchanger zinc DOES bottom out against the end casting. Ā I did not realize it on my first zinc change. Ā I do not go tight-tight on the zincs so no damage was done and it clearly had enough threads engaged to make a watertig…

      Started by: Rob Schepis

      1 Reply
      November 12, 2016 at 8:23 pm Rob, I was changing out all my zincs today.Ā  All, except one, had more than 50% life.Ā  But, I changed them anyway, thinking they would not go another season.Ā  The one exception was on the oil cooler.Ā  All that came out was the cap.Ā  Do you know if the remnants of that zinc would cause me any issue?Ā  Water temps are normal.Ā  Thanks.

      Last Post by: NoSpeed posted: 7 years ago

  •  

Viewing 14 topics - 3,761 through 3,774 (of 3,774 total)
1 2 3 … 187 188 189

You must be logged in to create new topics.