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- Cummins Marine Forum Topics
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Yanmar 4LHA STE Port Engine Lag
This topic has 2 replies, has 3 voices, and was last updated by
5 years ago June 4, 2018 at 5:05 pm My port engine is struggling getting past 1800 RPMs as I increase speed to get up on plane. It seems to lag behind the starboard engine by 400-600 rpms and eventually catches up with the starboard engine to get up on plane and max RPMs. Any suggestions on where to start?
2 RepliesJune 4, 2018 at 7:10 pm Post history of all past use and past operation over the last few years operation.. Exact boat model? Max RPM in neutral? Max RPM in gear? Typical Cruise RPM? TonyLast Post by:
posted: 5 years ago
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Interpreting a propeller balance report
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This topic has 23 replies, has 6 voices, and was last updated by
5 years ago
April 12, 2018 at 11:12 am Hello All, I had my propellers checked, repaired and balanced at Wilmington Propellers in Jan, 2016. The report said the propellers were 2″ off. I’m having a hard time interpreting the report for each prop. The Propellers are Michigan Hy-Torq, 18X24, 4 blade, #7 cup, 1 3/8 bore. The engines are Yanmar 4LHA-DTE @ 200 HP. The gears are ZF 450 A, 2.0 reduction. The boat is a Henriques 28 Express. The factory Tachs read about 150 high a…
May 21, 2018 at 4:32 pm Bill, The boost hit about 28 when I pegged the throttle and then dropped down to 23 to 25 psi. I’m used to the boost numbers for the 230/240 STP engine, in which boost was 30+ at WOT and 18/19 at 3,000. Thanks, Bob
23 Replies
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posted: 5 years ago
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My Yanmar 3JH2E, 36 HP, 3 cylinder has bluish white exhaust
This topic has 1 reply, has 2 voices, and was last updated by
5 years ago May 19, 2018 at 3:20 pm My Yanmar 1999 or 98 Diesel, model no. 3JH2E, 36 HP, 3 cylinder has bluish white exhaust. The hour meter reads 373 hours. (so it saids for a 20 year old Yanmar). Engine does look clean. No leaks and no major residue. The engines starts up with no problems. And runs good. All though I’m a newbie with diesels and boats. I bought my 1999 Hunter 376 sailboat two years ago. 1) Understand maybe diesel fuel less than 45 cetane can be a …
1 ReplyMay 19, 2018 at 3:49 pm Ron, Welcome to our forums……………..Although we are really “Cummins guys”, when time permits and someone goes to the trouble to to register here, it’s somewhat my duty to help if possible…………………You particular Yanmar engine, the JH2E–It was a very fine piece of machinery when it left the factory over 17 years ago.. Maybe one of the best diesels in that c…Last Post by:
posted: 5 years ago
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Raw water pumps 6CTA – 6BTA
This topic has 4 replies, has 4 voices, and was last updated by
5 years ago May 13, 2018 at 7:07 pm Any difference in raw waters pumps for 6CTA and 6BTA? 450hp Cummins
4 RepliesMay 15, 2018 at 7:18 pm Thin smear of grease is allLast Post by:
posted: 5 years ago
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4LHA-STP Proper coolant
This topic has 4 replies, has 4 voices, and was last updated by
5 years ago May 13, 2018 at 3:54 am Hello again! So, decided to change thermostats, and flush coolant as I didnāt have any idea when it was done last…….. Yanmar pretty vehemently requested Texaco extended life AF in their bulletin………. Texaco was purchased by Chevron, and their Delo ELC replaced the Texaco product, problem is, Iāve been waiting over a week for a mysterious delivery of a case of concentrate that no one seems able to trace! Iā…
4 RepliesMay 15, 2018 at 5:11 pm Ed, I have run Prestone, Dexcool in my 4LHAs since day one. That amounts to 18 years and 5,739 hours with no problems. As Rob mentioned, silicates and phosphates free is very important. BillLast Post by:
posted: 5 years ago
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Cummins 6CTA 450hp Fuel Management System
This topic has 3 replies, has 3 voices, and was last updated by
5 years ago May 13, 2018 at 8:05 pm Any one could assist what all required for fuel management system on your electronic display? Twin Cummins 6 CTA 450hp Diamond series Simrad EVO 3 new range fish finder, gps, mapping, radar 16inch and 12inch display units onboard.
3 RepliesMay 15, 2018 at 8:00 am Tony Athens wrote: Tim, āYour enginesā say QSB 6.7, so obviously you do not have these installed with these.. Do you have past experience with these units on mechanical engines? I am very familiar with the older Flowscan stuff, but would like to learn and a modern alternativeā¦ā¦ā¦ā¦.Tell me what you know āhands-onā about them.. Tony Tony I have not utilized these. I was looking into adding a fuel flow system onto my old Volvos but ultimately dec…Last Post by:
posted: 5 years ago
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Need help to diagnose CAT problem
This topic has 7 replies, has 4 voices, and was last updated by
5 years ago May 14, 2018 at 10:06 am I have Tiara with 3208 TA 375HP cats I have one engine with a power issue that we can not diagnose. At about 1900- 2000 RPM boat planes and both motors do OK… But as throttle is increased , say around 2200, the port engine rpm does not equal the STB at the same throttle position. The more throttle the worse this becomes until you hit WOT. should be 2800 however STB reaches 2750 but port will only reach 2450-2500. you can feel the s…
7 RepliesMay 14, 2018 at 9:54 pm Again, working on pure diesel theory as I know next to nothing specifically about CAT…. My first thought is itās a fuel delivery issue. Thus why I was suggesting you spend some time with vacuum and or pressure gauges to diagnose the health of the fuel system. Often times a restriction or a failing pump will not support engine rpm above XXX rpm but run just fine below whatever number XXX is….so you could be looking to rule out a weak …Last Post by:
posted: 5 years ago
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Air Intake filters Walker Airsep vs K&N
This topic has 1 reply, has 2 voices, and was last updated by
5 years ago May 13, 2018 at 7:01 pm I have twin 6CTA 450hp Diamond series with Walker Airsep intake filters. Any improvements in performance and fuel consumption if i change to K&N filter unit same as advertised on SBMar online shop? Regards Awie Richards bay South Africa
1 ReplyMay 14, 2018 at 8:11 pm Awie, This is not an IMO, take this as FACT….. Whether you use a factory supplied Paper air cleaner element made buy Donaldson or Fleetguard, a Walker Airsep, or what we supply made by S&B, you will not see any difference in performance or fuel consumption if the system you have installed is in proper working condition… As to other benefits or features, there you have major differences………. Engine room cleanline…Last Post by:
posted: 5 years ago
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4LHA-STP Oscillating idle
This topic has 4 replies, has 3 voices, and was last updated by
5 years ago April 29, 2018 at 2:37 pm Hello All, Feels strange to post this problem on a Cummins site, I hope no one gets offended, but I could use some help with my Yanmars! Anyone have any experience with the governors on the 4LHA-STP? Engines have 600 hrs on them, burn rates are the same and incredible, oil samples are flawless, my only problem is my port engine seems to fluctuate rpm at idle no load. Iām set to 750 rpm, and it wants to float between 750 and 800 on abou…
4 RepliesMay 12, 2018 at 2:11 pm Yes the docks were replaced after Sandy………… pretty much EVERYTHING floated away to some extent. Thatās why I went to Massachusetts to find my boat. Lol. I canāt say enough good things about Nichols Marina. Itās gorgeous. As far as attempting any adjustments, it truly hasnāt acted up enough for me to try anything as of yet…….. Iāve decided to take care of Installing New thermostats and a coolant change, s…Last Post by:
posted: 5 years ago
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SB Mar, Dual Engine Boost Gauge
This topic has 4 replies, has 2 voices, and was last updated by
April 27, 2018 at 6:07 pm I bought the above mentioned gauge. Couple of questions. 1- The pressure ports are marked R and F. Which is for Port and Starboard? 2- Can I mount the gauge on a horizontal surface or does it need to be vertical? I have a spot on the dash, near the helm in which the previous owner mounted a portable GPS and he took it with him. I have 3 holes in the location. Putting the boost gauge here would eliminate these holes. It will be easy to read. I d…
4 RepliesApril 28, 2018 at 3:33 pm I was hoping someone from SB could answer the question. I will have to call on Monday. The face has a red and green indicator needles. Thanks. BobLast Post by:
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Qsb raw water belts.
This topic has 9 replies, has 5 voices, and was last updated by
6 years ago April 19, 2018 at 5:50 pm The older qsb with a v belt is so simple and works great for tensioning. The flat serpentine belt is a just a crazy design. Anyone have tips to pit it on. I just did two and replaced a pump to a seaboard pump. I think the jabsco pump was easier than the seaboard pump. Had to loosen everything then pry the belt over. Seems to tight to me. The jabsco pump I put one bolt in and levered the pulley into place with a pry bar. Reguardless I think itās…
9 RepliesApril 27, 2018 at 5:08 pm If you had a Sherwood QSB pump side but side with the SMX QSB pump and took them apart, with your experience, you immediately see why “Sherwood” left a lot of room for improvement……….. Actually, you might be impressed .. TonyLast Post by:
posted: 6 years ago
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boost/pyro gauge install
This topic has 4 replies, has 2 voices, and was last updated by
6 years ago
April 14, 2018 at 7:58 pm Starting the installation of the sbmar gauge kit. Has anyone done an install on a 4LHA-STP? Will I need to drill and tap both locations or can I get by using existing plugs. also will the boost gauge need to be installed on the turbo itself? FullSizeRender 7 by b gon[/url], on Flickr
4 RepliesApril 15, 2018 at 5:17 pm Interesting. Although that is another pic in my library, its from a neglected 28 albemarle a friend of mine was looking at. poor set up for sure. thanksLast Post by:
posted: 6 years ago
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Overheat Due to Shredded Serpentine Belt
This topic has 2 replies, has 2 voices, and was last updated by
6 years ago
April 11, 2018 at 10:44 am All, I had an overheat event the other day. I have a 2001 32′ Topaz express with twin Cummins 370B’s and usually run at 20 knots cruise around 2400 rpms. At WOT, I can get 3100 rpms no problem. Anyway, I was running about 2400 rpm and shredded a serpentine belt on my port engine. The Aqualarm alarm panel and Seaboard sensors I installed worked as expected (I have the SMX 205F temp switch installed at the point on the exhaust man…
2 RepliesApril 11, 2018 at 6:26 pm Thanks for the reply Donald! The boat is in Orange Beach, AL and it was used over the winter, so it wasn’t laid up for months like a lot of northern boats. I plan on doing exactly as you suggested with a straight edge to check on the pulley alignment. I am re-locating the coolant overflow tanks so I can get rid of the belt guards and make checking this stuff out a lot easier. I checked all of the pulleys and they all spin smooth with no sl…Last Post by:
posted: 6 years ago
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QSC-600 prop issue
This topic has 11 replies, has 3 voices, and was last updated by
6 years ago March 2, 2018 at 7:53 pm We have had concerns that our 2008 Sea Ray 47 Sedan Bridge isn’t propped correctly. Not sure what direction to go with this as we are new to addressing prop issues. Below is the data I collected at the end of last season. All gal/hr RPM Port Starboard Spec # from cummins 600 0.6 0.5 800 1 0.9 1.2 1000 1.7 1.5 1.8 1200 2.7 2.4 2.8 …
11 RepliesMarch 10, 2018 at 10:47 am Zach Babcock wrote: Rob, On the attachment I donāt see an axis to plot fuel consumption. What am I missing? Right, on the Quantum engines they dropped the curve of RPM vs GPH that was provided with the mechanical engines so you have to work with the data provided below the graph. Plot your GPH at the RPM’s listed in the chart and comparing that to the printed GPH will tell what is needed to be told..Last Post by:
posted: 6 years ago
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Wet Exhaust Doomed to Fail?
This topic has 2 replies, has 3 voices, and was last updated by
6 years ago February 23, 2018 at 7:16 pm I’ve been contemplating a 2007 Novatec 55 with QSM 11s. Could someone comment if this wet exhaust arrangement one of the doomed to fail designs?
2 RepliesFebruary 23, 2018 at 9:42 pm More overview pics would be helpful but at least it appears there is ample room to build it right and safe.Last Post by:
posted: 6 years ago
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Northern Lights M673 blowing black smoke
This topic has 3 replies, has 2 voices, and was last updated by
6 years ago
February 11, 2018 at 4:14 pm My 2001 M673 with 550 hrs is blowing a lot of black smoke and it seems the oil level is high…. Not foamy, could it be diesel fuel in the oil? I changed the oil and the problem continued? I changed the fuel filters and impeller with no change in the problem – smells and seems hot? and lots of soot in the water. Never had soot before and not sure if hotter than usual – the high temp switch did not shut it down Could it be a t…
3 RepliesFebruary 12, 2018 at 1:47 pm Attached are some pictures of the generator…. The last picture is the soot on the water. I ran the generator with the air cleaner out and the top off, no smoke with no load, as soon as I added a load it began to puff black smoke. The filters were crumbling when removed, intact while installed. Let me know what you think. MikeLast Post by:
posted: 6 years ago
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Detroit 60 series 825 Hp research/issues/
This topic has 2 replies, has 2 voices, and was last updated by
6 years ago
January 20, 2018 at 11:33 am I have a friend considering the purchase of a 48 Sportfish express which has twin 825hp rated Detroit 60 series engines- 1700hrs on one and 2800+ on the other. 2003 Vintage dont know S/Nās. I have read a number of posts online in various forums back in ā03-05 regarding concerns for their longevity in installations over say 500 hp and also some commentary on faulty aftercoolers backflooding (and severely damaging) engines as well as some rumors…
2 RepliesJanuary 24, 2018 at 3:04 am This is good news (I think) and will obviusly have to do some research on the boat. Can anyone recommend a surveyor to look them over if he decides to go ahead with it?Last Post by:
posted: 6 years ago
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Transmission locks when rotated by hand
This topic has 13 replies, has 4 voices, and was last updated by
6 years ago January 14, 2018 at 9:08 am Have twin 6btas 330 with ZF transmission. When having the bottom painted and the props repitched noticed that the transmission will lock when you rotate prop shaft slowly and will unlock if you reverse it and Turn again. Turns freely otherwise until it locks again after more rotations. Transmission is in neutral when this is done. Does not seem to be a problem when the engines are running and I’m driving the boat. However, several mo…
13 RepliesJanuary 16, 2018 at 7:01 pm Not sure where I came up that you had a ZF220A — Sorry for the goose chase…. Does your data tag on the gear tag say ZF63A, or it that a guess, or from a survey………………………………..That would not be a normal OEM supplied gear for that engine.. Regardless, we’ll need to all re-think this issue as now things are way diffenent TonyLast Post by:
posted: 6 years ago
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Yanmar engine 464 hp
This topic has 2 replies, has 3 voices, and was last updated by
6 years ago January 8, 2018 at 2:48 am Hi Everyone we have launched a new 53 ft boat with twin 464 , 6 cylinder commercial duty Yanmar diesel engines The engines are meant to have a maximum rpm of 2700 when at full speed. Unfortunately , they only go up to 2200 RPM ( Its not the propellers , since even with engines out of gear , engines dont exceed 2200 RPM) Any tips as to possible causes for this problem ? Thanks beforehand G
2 RepliesJanuary 8, 2018 at 6:12 pm Tell us what the EXACT model of the engine.. 464 HP tells me nothing.. Better yet, maybe a very clear and in-focus picture of the data tag.. TonyLast Post by:
posted: 6 years ago
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yanmar 6lya stp
This topic has 3 replies, has 3 voices, and was last updated by
6 years ago
November 29, 2017 at 12:42 pm Buying a boat with a 440 yanmar 6ly2a with 650 hours. Going to have head and valves replaced because of problems that the 440 has had , this engine has not had tjat issue.Anything else I should be concerned about with this engine. 2006 engine. Thanks Bill
3 RepliesNovember 30, 2017 at 7:09 am Thank you Tony, I am flying up to Maine Tuesday, and I will take pictures of the motor, exhaust, etc. and post. Seller was very conscientious, as I am with my 370, and he has had coolers serviced, anti freeze I will check and she is propped properly. He only cruised from 2200 to 2800 but mostly at lower rpms. Now I am having the seller replace the head and the valves , this will be done by Lyman -Morse an authorized Yanmar dealer. Do you hav…Last Post by:
posted: 6 years ago
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Yanmar 4LHA STE Port Engine Lag
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