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Viewing 14 topics - 1 through 14 (of 14 total)
    • Cummins Marine Forum Topics
    • QSC Coolant

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

      December 15, 2022 at 5:43 am What is the coolant change recommendation on QSC 500’s with Fleetguard ES complete? This coolant was added 125 hours and three years ago. Owner has been told it needs to be changed because of time.Ā 

      Started by: Dave Carlson in: Cummins Marine Engines

      1 Reply
      December 15, 2022 at 5:40 pm IMO–Don’t waste your $$ based on the age or the hours unless something stupid has happened or something seems wrong “looking at it”..

      Last Post by: Tony Athens posted: 1 year ago

    • Volvo Coolant

      This topic has 3 replies, has 3 voices, and was last updated byPatrick Poorman 1 year ago

      April 25, 2022 at 4:57 pm I recently went over to the dark side and purchased a 2009 boat with Volvo 600 IPS. I am looking for an alternative coolant to use in these engines and Volvo is very tight lipped on specs, their coolant is $32 per gallon. Does anyone have experience with these engines or have an opinion on the subject? I should mention that at this price it is not even available in the quantity I need.

      Started by: Dave Carlson in: All Other Marine Diesels

      3 Replies
      May 25, 2022 at 5:33 am I have 07′ Volvo D6’s, I needed to top off one engine as we lost some coolant changing out the temp sender. My mechanic said that Prestone green is just fine to top it off with. He is an excellent Volvo mechanic, been to the school and has the software. I topped it off with a pint or so two summers ago and all good. I’m sure you will be fine with the Prestone you used.Ā 

      Last Post by: Patrick Poorman posted: 1 year ago

    • QSC Advice

      This topic has 3 replies, has 4 voices, and was last updated byRob Schepis 2 years ago

      February 4, 2022 at 9:23 am I am posting this to hear the reactions to something a friend was told about the need for aftercooler service in Florida. He has a three year old Cummins QSC powered boat and was told by the local diesel guru (not a Cummins tech) that these new engines do not need the aftercoolers removed to clean the cores just acid flush the cooling system! Did I miss a memo on this?

      Started by: Dave Carlson in: Cummins Marine Engines

      3 Replies
      February 4, 2022 at 3:30 pm Any mixed metal cooler needs proactive TLC.

      Last Post by: Rob Schepis posted: 2 years ago

    • Air Intake Temp

      This topic has 8 replies, has 3 voices, and was last updated byRichard Pietraszko 2 years ago

      May 11, 2018 at 9:12 am I know air intake temp can indicate the condition of the after coolers. What values relative to sea temp are considered nominal on QSB/QSC engines? I have a friend with QSB’s that run 20 deg. over sea temp (100) while my QSC’s run 4-5 deg (86) over sea temp at cruise. Sea temp was low 80’s on the day we were cruising together. The QSB’s have issues with performance and are over propped also. Any thoughts on his after …

      Started by: Dave Carlson in: Cummins Marine Engines

      8 Replies
      June 13, 2021 at 6:31 am Sorry I should have been more specific than just ā€œyes and yesā€. Yes, after coolers and heat exchanger were removed from the engine and serviced at the shop, not just some quick cleaning onsite.

      Last Post by: Richard Pietraszko posted: 2 years ago

    • Diesel Down Time

      This topic has 1 reply, has 2 voices, and was last updated byRob Schepis 3 years ago

      June 1, 2020 at 10:51 am We have been having a discussion here in Florida on what to do if a boat owner goes up north for 3-4 months and their boat sits unused for that time period. The engines are QSC’s and flushed after every use. The local Marina has a “Boat Watch” which includes a monthly start up of the engines and idle at the dock. My feeling is you will never get 4.5 gallons of oil warm enough to do any good at idle and maybe do actual harm. Bet…

      Started by: Dave Carlson in: Cummins Marine Engines

      1 Reply
      June 1, 2020 at 11:12 am I agree Dave, unless she’s taken out of the slip and a load is put on the engines to get them up to full operating temperature better off letting them sit. Be sure the seawater is 100% flushed out of the circuit with freshwater or even something like the non-tox winterizing antifreeze that has corrosion inhibitors even though the freeze protection is certainly not needed. And, of course, be sure the engine room air space humidity is regu…

      Last Post by: Rob Schepis posted: 3 years ago

    • New Aftercooler

      This topic has 6 replies, has 5 voices, and was last updated byDave Carlson 4 years ago

      February 25, 2020 at 6:58 am The attached photos are of a brand new aftercooler that was dismantled to grease per Seaboards proto call. I am assuming this is condensation from assembly at the factory. There was already some corrosion around the o-ring! This is a good example to show why Tony’s procedure should be followed even when the parts are new.

      Started by: Dave Carlson in: Cummins Marine Engines

      6 Replies
      February 27, 2020 at 8:21 am Thanks Tony and all that responded. I re-assembled the Seaboard way and went boating.

      Last Post by: Dave Carlson posted: 4 years ago

    • QSC Vibration Damper

      This topic has 1 reply, has 2 voices, and was last updated byLuke Nelson 4 years ago

      February 25, 2020 at 6:45 am I would like an opinion on this wobble of this QSC 500 vibration damper. I have removed it and can find nothing wrong with the mounting. Is there a test for these dampers? I did not notice a vibration in this engine specifically but the boat has a vibration between 1200-1900 rpms that a prop scan did not correct. I do not want to throw $400 at something that might be normal.

      Started by: Dave Carlson in: Cummins Marine Engines

      1 Reply
      February 26, 2020 at 3:56 am I have a pair of 540’s and I may not have the damper only a double pulley,after a look at quick serve i need to go look again! It will be interesting to find out what is meant to be there! cheers Luke

      Last Post by: Luke Nelson posted: 4 years ago

    • Aftercooler Sealing

      This topic has 7 replies, has 6 voices, and was last updated byworldcatlemon 4 years ago

      February 6, 2020 at 5:36 pm To those of you here that service aftercoolers, if the aluminum housing is pitted is it proper to use some other sealer besides grease? I have QSC engines which requires $3700 per aftercooler to replace and would like to dodge that bullet. I did add some pictures although they are not the best.

      Started by: Dave Carlson in: Cummins Marine Engines

      7 Replies
      February 10, 2020 at 2:32 am What I did on my aftercoolers for my 5.9qsb’s was I wire brushed the putting holes, filled the pits with 2 part marine epoxy filler, sanded the surface smooth, sprayed a light coat of epoxy primer and enamel paint and the sealing surface was restored. There’s also a body filler called “Allmetal” that is an aluminum base that you could use but it’s harder to sand. Good luck

      Last Post by: worldcatlemon posted: 4 years ago

    • Barry Mounts

      This topic has 2 replies, has 2 voices, and was last updated byDave Carlson 4 years ago

      January 25, 2020 at 8:34 am Looking into a possible engine mount change on QSCs. Is the center stud removable, especially on the new blue mounts sold here or does the engine need to go high enough to clear as is? Thanks

      Started by: Dave Carlson in: Cummins Marine Engines

      2 Replies
      January 25, 2020 at 5:09 pm Thanks for the reply Tony I didn’t think about possible Loctite.

      Last Post by: Dave Carlson posted: 4 years ago

    • QSC Blow by

      This topic has 5 replies, has 3 voices, and was last updated byDave Carlson 5 years ago

      April 4, 2019 at 1:22 pm I have a boat that had a pre-sale engine survey done and one engine’s crankcase pressure reading was 12 inches of water. This was done with a system similar to Tony’s diagram on this site. This is a strong running engine that does not burn oil or smoke with under 700hrs. Is this reading to be considered bad? We are waiting for oil sample results and are checking the air sep with no problems found yet. Thanks Dave

      Started by: Dave Carlson in: Cummins Marine Engines

      5 Replies
      April 8, 2019 at 12:34 pm Thanks Tony and Phil, we are waiting for the oil sample reports and another blow by test to complete the sale. I did tell the buyer about the after coolers.

      Last Post by: Dave Carlson posted: 5 years ago

    • QSC Oil Leak

      This topic has 6 replies, has 4 voices, and was last updated byTony Athens 5 years ago

      December 6, 2018 at 5:26 pm I have an oil leak on a QSC 500 where the drain hose from the air sep attaches to the oil pan. This looks to me like an oil drain fitting that was adapted for a hose but before I remove the fitting and reseal I wanted to make sure there is not a nut inside the pan. Thanks to all and love the site!

      Started by: Dave Carlson in: Cummins Marine Engines

      6 Replies
      December 7, 2018 at 4:42 pm Just don’t get True Blue in your hair ! Tony

      Last Post by: Tony Athens posted: 5 years ago

    • Smartcraft Transducer

      This topic has 2 replies, has 2 voices, and was last updated byDave Carlson 5 years ago

      May 24, 2018 at 12:22 pm I am looking for info on depth transducer installation on a smartcraft diesel view with QSC 500’s. The transducer I received from Mercury is for older 8.3 engines with a flat 4 pin connector that is labeled to connect to the diagnostic port. The QSC has a round port. There is a transducer connector on the Medusa harness which does not work even if connected to 12V. Does anyone have any opinions on how or even if this can be done? These are…

      Started by: Dave Carlson in: Instrumentation & Electronics

      2 Replies
      May 26, 2018 at 11:46 am Thanks for the reply. I know they are outdated but they still work so I would like to put off replacement until needed!

      Last Post by: Dave Carlson posted: 5 years ago

    • Smartcraft fuel guage hookup

      This topic has 12 replies, has 4 voices, and was last updated byMike Mason 5 years ago

      March 20, 2018 at 7:28 am I have a new to me Tiara with Ver 1.0 Diesel Views and 500QSC engines (2006). The fuel management was not hooked up to the vessel views from the factory and I am seeking info on how to do this if it is even possible. I have not been able to find much online about this subject.

      Started by: Dave Carlson in: Cummins Marine Engines

      12 Replies
      April 27, 2018 at 8:37 pm My gauge on the tank is mechanical. If I use the below, can I convert to electrical and run to madusa harness? If so, what is the wiring schematic? Thanks

      Last Post by: Mike Mason posted: 5 years ago

    • QSC Info

      This topic has 2 replies, has 2 voices, and was last updated byDave Carlson 6 years ago

      December 29, 2017 at 6:48 am I have a new to me Tiara with 500 HO QSC engines No’s 46543630,46545376. The engine tag says governed to 2500 RPM which is contrary to the prop curve I have seen on this site. At full throttle the engines reach 2560 which should be good according to the tag. The fuel burn is off but from what I can tell these engines need a different curve. The boat runs very well with 25 knots at 2100 RPM. Any thoughts or has anyone seen this as the rat…

      Started by: Dave Carlson in: Cummins Marine Engines

      2 Replies
      December 30, 2017 at 3:14 pm I meant to thank Cory for the quick comeback.

      Last Post by: Dave Carlson posted: 6 years ago

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Viewing 14 topics - 1 through 14 (of 14 total)