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Oil pressure for ā85 early model 6BTA
This topic has 1 reply, has 1 voices, and was last updated by
2 years ago
October 13, 2021 at 5:01 pm I had a mechanic tell me my oil pressure is low on my ā85 6BTA. I was told it is supposed to be closer to 30psi at idle When I fist start the engine, the pressure gauge on the engine and on the dash both show about 22PSI..at 2000 rpm the pressure gauge is about 28psi As I idle into port, approx 800rpm the pressure goes closer to 17psi What is the standard operating PSI for these engines?
1 ReplyOctober 13, 2021 at 5:03 pm This is when I first start the engine and it seems to hover around 20psi as I let it run at the dockLast Post by:
posted: 2 years ago
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6BTA Console ignition switch start actions
This topic has 2 replies, has 2 voices, and was last updated by
2 years ago
September 19, 2021 at 6:57 pm Hi everyone, I’m having issues in understanding how the ignition works on the 6BTA. One of my engines does not start and I have noticed that I am not getting a signal into the mag switch before the starter solenoid. no “clicks” 1. I also noticed that the starter solenoid + post were several red wires connect is always hot, even with battery switches off. Although console and its switches don’t have power. Is this normal? …
2 RepliesOctober 13, 2021 at 9:31 am Thank you Tony. You are correct in that it needs to be sorted hands on. At the time of posting Id only had the boat for two weeks and was wrapping my head around all the to do lists. I’ve come a long way in understanding the 6bta by reading on your Tips page. I also decided to do some rather mayor maintenance to the mechanical systems (heatex, aftercoolers, gear and main crank seals etc etc) and will readdress this starting issue when I ge…Last Post by:
posted: 2 years ago
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6BTA5.9-M3 370HP Dies Randomly under way
This topic has 1 reply, has 2 voices, and was last updated by
2 years ago October 10, 2021 at 6:10 pm What might cause the fuel solenoid to just let go while underway? Engine would restart immediately with no problems, run for a minutes up to 10 minutes then die again. Seemed like lower speeds or in Neutral would go for longer intervals before it would die. Ran great on Friday night when we headed out for the weekend. I finally just zip tied it to get back home but the wife and kids were less than thrilled with the outing. Admittedly I havenR…
1 ReplyOctober 13, 2021 at 7:15 am 90%+ this is your issue.. Bottom wire connections loose or corroded or both..Last Post by:
posted: 2 years ago
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330 Cummins 5.9 Aftercooler Bundles
This topic has 1 reply, has 2 voices, and was last updated by
2 years ago October 12, 2021 at 9:47 am I have a twin 330 Cummins in a 3988 Bayliner. I have had smoke problems since I bought it. The previous owner installed aftermarket aftercooler bundles in it just previous to selling it. Working on the smoking issue I’ve re-pitched the props from 22×22 to 22×21 and had almost no gain in rpm. I get 2700 to 2750 as near as I can tell. Pulling the aftercoolers to clean them I discovered that they have 180 tubes compared to the C…
1 ReplyOctober 12, 2021 at 7:02 pm I’m not aware of the aftermarket aftercoolers you’re speaking of, however, to eliminate or confirm them as an issue, you need to measure the pressure drop across them. That’s easy enough to do. An accurate pressure gauge to take a reading before and after the cooler. Obviously there’s a factory port post-cooler, but you may need to have one welded into the turbo to cooler pipe to measure the pre-cooler pressure.Last Post by:
posted: 2 years ago
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6BTA max rpms under load
This topic has 10 replies, has 6 voices, and was last updated by
2 years ago
October 2, 2021 at 5:08 am 315 6bta, denso pump, 36′ downeast. I want to go from a 4 blade to a 5 blade prop to get more speed at cruise rpms. I understand that I want to be at 2925rpm fully loaded, WOT. I discovered yesterday with a strobe that, at cruise rpms between 1800-2400, my tach consistently reports 150 rpms higher than real engine rpms (ie, 2400 at gauge is 2250 by laser tach on harmonic balancer) My tach is showing 3200rpm at WOT (so assume 3050ish real r…
10 RepliesOctober 12, 2021 at 4:42 pm Thanks. But, I don’t think that is an adjustment. THat’s the set up for a mag pickup tach. DLast Post by:
posted: 2 years ago
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6BTA raw water intake thruhulls relocation?
This topic has 1 reply, has 1 voices, and was last updated by
October 12, 2021 at 6:17 am Hi, reposting the topic as something happened that it never made it thru yesterday. A bit of background first: I have concluded that to change the dripless seals, the gears need to be removed to gain access to remove the shaft coupler from the shaft. Heres the catch,,, to remove the gears they have to slide back from the flywheel (gear shaft inserted there) but there is no room behind the gear to slide it back. The shaft, coupler and dripless ar…
1 ReplyOctober 12, 2021 at 6:19 am Adding photos of current location for visual reference of problem.Last Post by:
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Bleeding 1998 6BTA 5.9M1
This topic has 1 reply, has 2 voices, and was last updated by
October 11, 2021 at 12:18 pm I have struggled to locate the places to remove air after new fuel filters installed. Surely there is a pump somewhere on the engine to do this. Please help. Yes I should install the bulb system but my Bayliner 4087 has issues that preclude such a mod. Show me pictures if you can. Regards Bill.
1 ReplyOctober 12, 2021 at 5:58 am left side of engine, towards the after end. It’s the first thing the fuel hose goes to. After that, follow the line to filter housing, then IP. You should see points along the way where you can bleed air from. DLast Post by:
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Shims under engine mounts – all different heights!
This topic has 3 replies, has 2 voices, and was last updated by
October 8, 2021 at 10:44 am Hi everyone, Im in the process of a 4-5 month maintenance to do list on my Lurhs (6BTAs and ZF 220A gears). One of the items on that never ending list is to replace the engine mounts (rusted studs/nuts and rubber doesn’t look too healthy). All of the mounts (Barry) have been shimmed differently on all 4 corners of each engine. From 1/2″ aluminum stack to 1 1/2″ under the actual isolator mount. The setup is like this: (top to bo…
3 RepliesOctober 11, 2021 at 1:48 pm Hi Rob. Not sure how to report that my latest topic was flagged as spam for some unknown reason. Its post #121722 related to relocating the thruhulls for better access. How do I proceed with trying to get the post active for discussion? Thanks!Last Post by:
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6BTA oil pan gasket change in boat
This topic has 7 replies, has 3 voices, and was last updated by
2 years ago
October 10, 2021 at 11:03 am I have an oil leak on the front end of the motor where the oil pan bolts to the block. I am wondering if the pan can be dropped in the boat and a new gasket installed. At the rear of the pan I have 3″ from the bilge to the bottom of the pan and the distance increases towards the front of the motor. Looking for feed back on if that is enough room to drop the pan in the boat? Will post pictures.
7 RepliesOctober 11, 2021 at 11:39 am Hello Tom, Yes, it is a 2000 Nordic Tug 37. I did tighten several of the pan bolts in that area but unfortunately it did not make a difference. The leak is not horrible but If I can solve it I would be happier. Thanks for the reply! LeeLast Post by:
posted: 2 years ago
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6bta 5.9 – what engine oil?
This topic has 2 replies, has 2 voices, and was last updated by
2 years ago
October 11, 2021 at 8:49 am I’ve searched high and low – can’t find the oil spec for this engine but I have seen the capacity recommendations. What oil should I be using – viscosity and brand? Synth or non synth? –Kevin
2 RepliesOctober 11, 2021 at 11:20 am Tom – extremely helpful – thanks much. –KevinLast Post by:
posted: 2 years ago
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Cummins 6bta in Northeast US – RW Antifreeze?
This topic has 5 replies, has 5 voices, and was last updated by
October 8, 2021 at 8:34 am I’m not new to small sailboat diesels but I am new to our recently purchased mainship390. Has 2001 Cummins 6bta 330 engine. I keep hearing that I should use “Green” antifreeze to winterize raw water side of engine, vs the “pink” potable stuff I’ve always used in small yanmars. What product name is that? What is the chemical composition? If it’s not potable, what do you all do to recover what comes …
5 RepliesOctober 11, 2021 at 7:18 am Thanks Russ – good luck! –KevinLast Post by:
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Lift Pump leak on 6BTA M3
This topic has 2 replies, has 3 voices, and was last updated by
2 years ago
April 8, 2020 at 9:19 am 6BTA 370hp M-3, CPL 2008. Manual lift pump is leaking when the thumb plunger is operated but not otherwise (no leak when engine is running and vessel underway). No hard-starting or evidence of air leaks. What’s the right approach to fixing this please?
2 RepliesOctober 11, 2021 at 4:48 am Tony or Paul, I have the same issue. the pump leaks at the plunger. The lift pump plunger came off really easy but I cannot figure out how to disassemble. It looks like it has been pressed together at the factory. Any help is appreciated. Regards, JimLast Post by:
posted: 2 years ago
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QSB 5.9 Loss of Power at High RPM
This topic has 4 replies, has 4 voices, and was last updated by
2 years ago
September 24, 2021 at 7:54 am Hello, I’ve got twin QSB 5.9’s 425hp from 2013 in my Azimut 50. I’ve just had the heat exchangers, after coolers, and turbos replaced which I don’t think are related to this issue. I’ve intermittently had a sudden loss of power for some time now and its progressively getting more severe and more often. The first time it happened I was cruising around 2500 RPM and I felt a sudden surge (loss of power). It returned t…
4 RepliesOctober 10, 2021 at 5:15 pm I’ve read about this happening elsewhere. Belt dust build up or some other contamination interfering with the sensor reading. Or an outright failure. If the computer doesn’t know where the crank is it will shut the engine down.Last Post by:
posted: 2 years ago
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6bt alternator diode getting hot
This topic has 1 reply, has 2 voices, and was last updated by
September 29, 2021 at 6:06 am hi guys in trouble shooting a few things around my 6bt trying to trouble shoot my engine buzzer not working – i found that the diode that is on a yellow wire running to the alternator was getting warm when the ignition was on (engine not running) – i cut it out and joined the wires (engine still not running) and the voltage went up on the dash….. I checked the other engine and couldnt find a diode to the alternator? 1) is a di…
1 ReplyOctober 7, 2021 at 5:31 pm Yes, a diode conducting current will heat up. To much heat and it will go PIFF. I am going to guess that it is in the line to excite the alternator for instant charging start at engine startup. NO waiting for residual magnetism to build. Some alternators need the diode to stop any back feed which can prevent the engine from shutting down when you want it to. That back feed MAY keep the fuel shutoff energized which will feed fuel thus preve…Last Post by:
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diesel sight glass broken – cummins qsc 8.3 – bertram 410
This topic has 2 replies, has 2 voices, and was last updated by
September 30, 2021 at 12:22 pm I have a 2008 bertram 410 with cummins qsc 8.3ās. The sight glass that shows diesel tank level is broken and is leaking diesel from the bottom part of the glass. Do you know where I can find it? Thanks, Captain Carlos Rojas
2 RepliesOctober 7, 2021 at 5:14 pm No one yet? The “glass’ should be called Borosilicate glass which is tougher than standard glass. Ask around some hydraulic shops or diesel fuel suppliers. Also Mcmaster Carr may have some. The tops and bottoms of the sight glasses should have shutoff valves right at the tanks for exactly this reason. It is tough stuff but not infallible.Last Post by:
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Cracked Fuel Injector
This topic has 3 replies, has 2 voices, and was last updated by
2 years ago
October 3, 2021 at 11:32 am So I found a fuel leak coming from my 6bta. Its a cracked injector. Engine has less than 750 hours? Is this an unusual occurrence?
3 RepliesOctober 5, 2021 at 10:31 pm That injector had help getting damaged like that! Something dropped on it?Last Post by:
posted: 2 years ago
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Coolant flush and refill 6CTA.
This topic has 7 replies, has 6 voices, and was last updated by
2 years ago
April 23, 2021 at 4:05 am I have a new to me 6CTA 420 Diamond. 2600 hours. I think they told me a M2??? I would like to do a coolant replacement. Can anyone give me a few tips such as where is the drain plug and what is the recommended procedure. Also what coolant is the best replacement. Thank you for any input on this, Bill
7 RepliesOctober 4, 2021 at 1:38 pm Hi All, Saw this thread and it has great info! Quick additional question. During our sea trial, I watched the owner pour green coolant ethylene glycol into orange coolant on the port engine. It was only a slight amount to top up the coolant recovery bottle which was much lower than the starboard engine. I know this could be bad as if one was OAT and the other was EG it could cause gelling. I know the coolant was changed in Sep of 2020 on both …Last Post by:
posted: 2 years ago
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Erratic Idle QSB5.9 380hp
This topic has 3 replies, has 2 voices, and was last updated by
2 years ago October 2, 2021 at 5:56 pm I just purchased a 2006 Meridian 411 with two QSB5.9 380hp. (400hrs) I had the local Cummins service shop do a complete service on both motors and they said they were in great shape. (They also installed two Seaboard water pumps and were very impressed with them) A few days later, I set out on a 100 mile trip and I ran them up to 1000RPM and I noticed that the starboard motor didnĀ“t come up to 1000. It stayed at idle around 600rpm. As I pushed…
3 RepliesOctober 4, 2021 at 6:18 am Did you contact the Cummins shop that had just done all of the servicing do advise them of this new issue? Post some photos of your displays and your controls.Last Post by:
posted: 2 years ago
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Cracked turbo? QSB5.9-380
This topic has 9 replies, has 5 voices, and was last updated by
2 years ago September 7, 2021 at 4:34 pm 2006 Tiara Open 3600, twin Cummins QSB5.9-380s, around 1,010 hours. I purchased boat in July 2020 out of fresh water, and now it’s in salt water. Engines generally start/run great, just traveled Boston to NYC and back. Thought I noticed a little white smoke one or two times in my exhaust, but then it seemed to go away. I changed the coolant last winter, and after 45+ hours of use this season, just had to refill my overflow (once). So i…
9 RepliesOctober 4, 2021 at 3:39 am Tony, Just getting back from Trawlerfest in Baltimore. Yes our mechanic did secure 2 heads. We are slated for head replacement over the winter layup. We will also get the Pyros installed that I bought earlier this year. I am changing the oil in the mains and transmissions this week and then we get hauled out the following week. Then the fun begins as we are also having serious work done on the navigation electronics. Big winter for us.Last Post by:
posted: 2 years ago
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5.9 QSB warm start issue
This topic has 3 replies, has 2 voices, and was last updated by
2 years ago
October 2, 2021 at 11:13 am Hey guys running into an issue with one of my engines. It starts and runs perfectly every time from ācoldā start. If I leave the block heaters on to where it keeps the oil temp around 130 the engine will not start. Itās as if itās completely dead, no crank or turnover. This just started this week, happened while out fishing. So I left block heater on for a few days, came back wouldnāt start. Turned them off for a day and came back, started right…
3 RepliesOctober 2, 2021 at 2:50 pm Attached photos, also engines were new 2016 around 500 hoursLast Post by:
posted: 2 years ago
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Oil pressure for ā85 early model 6BTA
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