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- Cummins Marine Forum Topics
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New Boat, and Propping
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This topic has 31 replies, has 6 voices, and was last updated by
October 19, 2023 at 9:18 am I recently purchased a new boat to me. Its a 31′ Bertram FBC. It has 2003 Yanmars 6LYA-STP 365 H.P. Each engine has right at 700 hrs on them. The gears are zf models 220A, ratio is 1.75:1 and she is propped at blade 22 x 24 x 1.75. I was told when lifted at the yard, that she weighs 18k pounds. It also refit by Cabrera Yachts in 2003. They tunneled the hull as well. This boat reminds me of Shooter that Seaboard refit. The old owne…
April 2, 2024 at 8:15 am Any thoughts or suggestions?
31 Replies
Last Post by:
posted: 3 weeks ago
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Metal in fuel
This topic has 3 replies, has 3 voices, and was last updated by
2 months ago
February 2, 2024 at 12:36 pm Iām looking for some advice with a problem Iām having with my yanmars. I have a 2001 32 albemarle with twin yanmar 6lya-ste with approximately 1350 hours. For filtration each engine has a racor 900 with 10 micron filters and then the on engine yanmar filter which Im unsure of the micron rating.Ā <br /><br />Over the summer I thought I may have gotten a tank of dirty fuel from one the marinas I travel to. The racors which normally last…
3 RepliesFebruary 4, 2024 at 3:13 pm Metal in the return lines are probably debris that were in the lines when the system was installed. Ā If the HP pump was spitting metal, there would be other obvious symptoms. Ā If the debris were coming from the tanks, your filtration system has failed miserably, but those debris couldnāt pass through the pump without causing damages anyway.Last Post by:
posted: 2 months ago
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yanmar exhaust design
This topic has 2 replies, has 2 voices, and was last updated by
January 5, 2024 at 3:57 pm I am redesigning the exhaust system on my boat (Bertram 31)Ā I was copying Shooters exhaust, but with a few changes.Ā I ran 4″nominal for the dry section, and used a 6″ OD for the mixer.Ā The gap between the dry exhaust, and the wet side on the mixer is 5/8″ On the mixer, I noticed Seaboard flares the inside (dry) portion of the exhaust.Ā Is this to hold water back a bit for better cooling?Ā Should I in some way close th…
2 RepliesJanuary 6, 2024 at 10:18 am I fallow you, thank you!Last Post by:
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Intermittent not reaching high cruise RPM
This topic has 2 replies, has 2 voices, and was last updated by
3 months ago
July 13, 2023 at 9:14 pm Something odd happens today. CAT 3126 MUI normal cruise about 2400 rpm max is 2850. Trolling speed for about 6 hours then time to run for home. STBD engine was at the throttle stop and only reached 2350. Ran fine at that RPM. So I throttled down ran it up and went right up to 2850 throttled back to cruise RPM 2400 and slowly had to keep pushing the STBD throttle forward until it was at the stop again holding only 2350. Port throttle was in its n…
2 RepliesDecember 31, 2023 at 2:16 pm No one yet? Did you get it sorted out?Last Post by:
posted: 3 months ago
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YANMAR 4JH4-HTE low Power
This topic has 3 replies, has 3 voices, and was last updated by
6 months ago
December 12, 2021 at 5:25 am This sailing catamaran has 2600 hours on 12 year old engines. No electronics. One engine runs up above 3200 rpm in neutral but only 2000 in gear. I new to the boat and not sure if it ever hit rpm. I am running out of a bucket, gravity feed with clear hose and new fuel Throttle linkage removed Just had the injector pump overhauled Just had the injectors tested Tested injector tubes for obstruction Checked valve lash Took turbo to the shop and was…
3 RepliesOctober 16, 2023 at 2:27 pm Dear Bart Harold,<br />I have the same problem with my yanmar 4jh4-hte, it’s driving me crazy.<br />Have you found the solution?<br />Like to hear from you<br />Kind regards, John LangendijkLast Post by:
posted: 6 months ago
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6lya-stp boost and winter heat
This topic has 6 replies, has 2 voices, and was last updated by
6 months ago September 29, 2023 at 7:47 am I have a 370 6lya-stp on a fresh rebuild. (40hrs ago). Previously I installed a pyrometer/boost gauge by smx but never got the boost part hooked up. I assume I need a threaded nut with hose barb to connect boost tubing to gauge. The guy who did the rebuild showed me where it should go on the motor, that little unit by the air cooler. If that is correct can you point me in the right direction for tubing and that ānutā. Also, i use my boat year r…
6 RepliesOctober 11, 2023 at 3:34 am Call the shop for the boost gauge kit.Ā Not sure what part of CT you are in but Defender Marine sells a few different heaters.ĀLast Post by:
posted: 6 months ago
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yanmar 4lha-ste engine temp.
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This topic has 23 replies, has 4 voices, and was last updated by
7 months ago August 3, 2020 at 10:08 am Starboard is burning more fuel, higher temp, slightly higher oil pressure and minor darker exhaust vs the portside. (only happens when 2500+ rpms / cruising out) Any ideas? heat exchanger? too much fuel/burning rich? Thanks! Engines: twin turbo diesel yanmar 4lha-ste
September 20, 2023 at 11:49 am If it were me, I would go with the following https://www.sbmar.com/product/bronze-tee-adapter-for-freshwater-flush-system/ The valve is only for safety.Ā It will always be open as well the sea cock. And then this https://www.sbmar.com/product/stainless-freshwater-flush-thru-hull/ and a Ā¾ inch hose barb to fit the thru-hull fitting and one to fit the top of the valve. And Ā¾ inch reinforced tubing All bronze, no plastic. Or if you have Groc… 23 Replies
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posted: 7 months ago
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Black Racor Primary filter element
This topic has 9 replies, has 6 voices, and was last updated by
1 year ago November 18, 2022 at 9:21 am I posted this same question on Boat diesel and received a few good comments. I thought I would try for a few more opinions. History: I purchased the boat a year ago 34 Mainship Pilot twin 4LHA-STP Yanmars. The previous owner had fuel tank issues when he purchased the boat in 2012 and had the tank (240 gallon aluminum tank) Cleaned ( Polished ) I have the report. He had the filters changed a couple of times a year and maintained the boat but only…
9 RepliesApril 8, 2023 at 3:47 am You said you don’t like electrical fuel gauges – and I agree that typical senders with swing arm setups are crap.Ā But consider three other options.Ā My boat uses all three. Regular electrical gauges attached to Centroid senders.Ā These have no moving parts and are ordered to fit your tank depth so come pre calibrated.Ā They can work with Analog needle or digital gauges. NMEA digital tank senders which also have no moving parts.Ā Mar…Last Post by:
posted: 1 year ago
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Neither turbo spooling up Man D28 v12 mechanical
This topic has 5 replies, has 3 voices, and was last updated by
1 year ago April 4, 2023 at 5:41 pm Looking for troubleshooting suggestions. Hereās where we are: I recently completed cooling system service and replaced fuel cooler after it failed, leaking sea water into tank.Ā Got water out of tank, changed primary and on engine filters, all had some water in them. Boat ran fine after repairs – temps looked good, etc. After about an hour of running, tried a WOT test. Both engines made rated RPM+ (~2350) throttled back. My mechanic though…
5 RepliesApril 6, 2023 at 5:44 am I thought the same thing I just donāt see what it could be. The airseps are also only 2 years old and I donāt see any sign of deterioration or anything. Only thing I could think of would beā¦and this would be awfulā¦maybe the techs when disassembling the engine for cooling system flush used the filter as a bucket to put nuts and bolts inā¦then maybe they forgot a washer or something in there when it went back on. I guess if so weāll find it when we…Last Post by:
posted: 1 year ago
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Fuel in Oil – Onan Generator
This topic has 3 replies, has 4 voices, and was last updated by
1 year ago March 14, 2023 at 9:47 am I just got my oil sample back on my 9KW Onan generator and it unexpectedly had a huge jump in the % of oil in it (4%). The generator had sat for 5-6 months without being ran, could this have caused the increase of fuel in the oil?Ā There was a lot of oil on the water when I fired it up, which dissipated completely after running it for 10 min.Ā Other ideas? I’m seeing other possible causes as: Lift pump Injectors Piston seals Thanks for t…
3 RepliesMarch 23, 2023 at 12:16 pm Here’s the report re-uploaded as a jpeg image. Does this genset run with a good amount of load on it?Last Post by:
posted: 1 year ago
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Onan Generator runs without fuel pump?!?
This topic has 4 replies, has 3 voices, and was last updated by
1 year ago
February 11, 2023 at 7:34 am I’ve had intermittent issues with our Onan 10KW generator model MDKWB (diesel) tripping the DC control circuit breaker (the 10amp red breaker) shortly after startup.Ā Finally dug into it last night and this is what I discovered.Ā I traced it to a high current draw on startup and by process of elimination narrowed it down to the fuel pump.Ā And during that process, after disconnecting the electrical leads to the fuel pump, I started the gen…
4 RepliesFebruary 23, 2023 at 1:19 pm I have a 9kw Onan MDKAL. I believe our fuel pumps are only used during preheat when the control switch is held in the stop position. In the stop position the fuel pump is purging any air from the low pressure side of the fuel injection system. If you ever start your generator without first using preheat, then you would also not be priming the low pressure side which is no problem if you don’t have any air in the fuel system.Last Post by:
posted: 1 year ago
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Turbo Wash
This topic has 1 reply, has 2 voices, and was last updated by
1 year ago January 11, 2023 at 11:38 am I repowered with 370 Yanmars back in 2006.Ā I think this is just before all the electronic stuff was added to these engines.Ā Yanmar back then had a product and procedure called “turbo-wash” that was a soapy/water mixture that got sprayed directly into the air intake while the engines were rev’ed up and under load.Ā This was intended to remove any carbon build up and clean the system.Ā Ā My engines have about 1700 hours now and …
1 ReplyJanuary 11, 2023 at 6:00 pm Yes, Yanmar’s best vintage IMO, great engine, treat it to the highest of standards. I’d remove the air cleaner first and get a good visual of the compressor fins so you know how things looked before the “wash” and then give it a go with a squirt of Dawn in a spray bottle … a few minutes of spraying out at sea at cruise.Ā Then compare what you see afterwards as to where you started…Last Post by:
posted: 1 year ago
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Yanmar 4JH3-HTE
This topic has 1 reply, has 2 voices, and was last updated by
1 year ago December 12, 2022 at 1:23 pm Hi, looking at a sailboat that has a Yanmar 4JH3-HTE (100 hp) in it. The antifreeze overflow tank is not attached to the nipple underneath the fill cap but somewhere near the front left of the engine (maybe near the thermostat??). When you open up the fill cap to check the level it is not up to the top as it would be on my Westerbeke 40, it is about 2″ down. The engine was installed 20 years ago and seems to work fine and seems well mainta…
1 ReplyDecember 12, 2022 at 6:29 pm Your system was designed to operate with a non-pressurized Plastic overflow bottle kinda like 99.999% of the cars out there.. That way you have visual of the coolant level.Ā Cold,Ā all is 100% full in the engine -Plastic bottle maybe 50% full.. Hot the bottle rises a tad, & w/ the engine cools,Ā the bottle goes back down……..Too simple when all is right and the engine is empty of air and has a proper coolant cap. Sounds like you d…Last Post by:
posted: 1 year ago
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Engine removal and Maintenance
This topic has 2 replies, has 2 voices, and was last updated by
1 year ago
December 2, 2022 at 2:16 pm Hi, We have a pair of Yanmars’ 4LHA STP on a Bertram 28 1980 installed circa 2006 with 2,100 current hours. We will be replacing the mounts and doing an overall servicing, painting etc. at the shop. Is there anything that you would recomend doing to the engines while they are out (i.e. replacing certain hard to get hoses, oil lines etc.? Maybe replacing oil pan gasket? Things that may be easier to do while the engines are in the shop. We w…
2 RepliesDecember 5, 2022 at 2:49 pm Thanks for the reply Tony, Attached some pics.Last Post by:
posted: 1 year ago
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Yanmar 4LV (230) – Exhaust doubts
This topic has 4 replies, has 2 voices, and was last updated by
November 18, 2022 at 9:09 am Dear All,<br /><br />Thanks for allowing me in the forum.<br /><br />I’m the captain of an 80 ft sailing boat launched in 2020, she mounts a Yanmar 4LV 230 hp engine.<br />The engine instrallation was carried out by the boatyard with stock Yanmar riser and mixing helbow.<br />The dry section of the riser reaches 8 inches over the waterline (despite there being at least another 16 inches of available heig…
4 RepliesDecember 2, 2022 at 10:08 am –Elbow/showerĀ Ā Ā Usually changed at the 5 yr mark for safety.Ā They have been known to go longer but mostĀ people would change at 5 yr.Ā Ā Ā SO the suggestion of every 2 yrs/500hr sounds good.Ā Ā THey usually give NO warning of internal leaks so a frequent change is a good precaution. –I question the washing.Ā Ā If the turbo ONLY sees the engine combustion soot, NO WATER AT ALL,Ā then I question the washing unless explained bet…Last Post by:
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Volvo KAD300
This topic has 1 reply, has 2 voices, and was last updated by
1 year ago September 6, 2022 at 8:19 am Hey all, looking at a new to me boat. Its a 28′ Pursuit with a Volvo 300 diesel and Volvo outdrive. Engine has 2200 hours. I’ve had gas inboards and just sold me twin Perkins diesel boat but still fairly new to marine diesels. Is 2200 hours a lot? Provided all service records are available and boat is in order is there anything I should be aware of with the Volvo diesel? There are 2 shops no to far from me that provide parts and serv…
1 ReplySeptember 20, 2022 at 5:26 am YouĀ will need to develop a good working relationship with your local Volvo guys Be prepared for high costs and high maintenance compared to similar sized boats with shafts and Cummins engines.. Outdrives have some big advantages in some ways, but you need to “pay for that”Ā big time. 2200 hours is not a lot–It’s the “marine age” associated with being in salt water that will do both the outdrives and engines i…Last Post by:
posted: 1 year ago
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4LH DTE white smoke
This topic has 1 reply, has 2 voices, and was last updated by
1 year ago
September 5, 2022 at 11:06 pm Bought a an old boat that was repowered in 2000 with Yanmar 4LH DTEās. Wasnāt propped right (only spinning 3050 at full RPM light load) so propped to the recommended 3300 (under load). Boat has done me well for almost 2 years but recently port engine has started smoking white bad with a sheen in the water. Not sure if itās fuel or oil. I seem to be burning coolant (reservoir pretty low and topped off recently) and smoke only gets worse with RPM …
1 ReplySeptember 10, 2022 at 12:24 pm White smoke can be from low compression or too much fuel.Ā Rainbow color sheen out the exhaust is bad injector tips. Try a pressure test on fresh water side of cooling system. Did you change coolant recently? If so, did you burb out the air at top of engine? Loosing coolant is bad. It has to go some where. What does the exhaust smell like? I have run these engines and the STP version for 4,000+ hours and never had your issue. Having 1,600 hours …Last Post by:
posted: 1 year ago
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Volvo Coolant
This topic has 3 replies, has 3 voices, and was last updated by
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.
3 RepliesMay 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.ĀLast Post by:
posted: 1 year ago
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CAT 3196 660hp
This topic has 10 replies, has 5 voices, and was last updated by
2 years ago October 21, 2021 at 1:09 pm Not familiar w/the CAT line. What is the good/bad about the 3196 660hp? Twin engine installation in a 43’/30klbs express.
10 RepliesApril 15, 2022 at 3:01 am Douglas, same here as to engine(s) first, boat second, when in the market.Ā I am surprised this concept is not more mainstream….Last Post by:
posted: 2 years ago
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Thoughts on these readings – Anything to investigate?
This topic has 3 replies, has 3 voices, and was last updated by
December 11, 2021 at 7:43 pm 1,000 hr – QSC 540’s ZF 285 A Listed out the data I pulled from the SmartCrafts at cruise and WOT. I note port engine a bit shy of WOT. Just had props done so will get it tweaked to get more RPM. Any thoughts on the difference or what they are showing? Manifold Temps, Gear Temps, Loads, etc.? Thanks in advance, J
3 RepliesApril 13, 2022 at 8:15 am Just some suggestions: Higher fuel filter restriction from more contamination one side to the other so one filter collects moreĀ junk. Hoses degrading inside closing the pathway. Longer hose runs one side to the other. Partial kink in one hose.Ā Doesn’t have to be a full kink. More fittings such as elbows one side to the other. Tank vent on one tank has a bit more restriction from hose degradation, bugs clogging the vent, kink in the hose.Last Post by:
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New Boat, and Propping
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