- This forum has 86 topics, 323 replies, and was last updated 1 week ago by
.
-
- Cummins Marine Forum Topics
-
-
Completed Repower of 38 ft Commander
This topic has 10 replies, has 5 voices, and was last updated by
3 years ago August 4, 2019 at 5:25 am Just completed the repower of my 1965 38ft Flybridge with rebuilt 6BTA 370ās with new ZF220Aās 1.75:1 Had Tony and guys build up a new exhaust system and fitted some of the SB engine upgrades and new custom engine and transmission mounts. With the old Detroit 8.2L Turbos with 2:1 TD 502ās top end at 3000 was 25 mph with cruise at 18 – 21 mph depending on load. Cruise at 2600 RPM burned 18 G/H. Propped with 3 blade bronze 22X20 on 1.5ā sh…
10 RepliesDecember 11, 2020 at 1:44 pm I think if you search on my name these should show up. I posted quite a bit in the past 2 years about this boat. fair number of pictures. Essentially, I cleaned out the previous engines and rebuilt the engine beds. Painted and updated the engine room and all hoses- etc. Made a wooden jig to rough align the engine mounts before install. Set the engines. Tony designed and made the engine mounts and designed and fabricated the entire exhaust f…Last Post by:
posted: 3 years ago
-
Repower 6-71 TIB 485hp to QSL9 405hp
This topic has 1 reply, has 2 voices, and was last updated by
3 years ago November 5, 2020 at 4:06 pm Looking to repower my Ocean Yachts 56′ CPMY (see my previous post “Repower 6-71 TIB 485hp to 6BTA M3 370hp” for vessel info). In my search for a deal on some good RTO’s I have just come across a pair of QSL9’s (obviously a much better fit then the BTA’s I was previously looking at). Reportedly these engines have been sitting for the approximately 5 years. They are being pulled from storage at the moment and wi…
1 ReplyNovember 6, 2020 at 7:15 pm You’re never look back if you do a proper install.. That will be the key and that would apply to any modern engine………… Engine Build data attached..Last Post by:
posted: 3 years ago
-
shaft log and shaft diameter
This topic has 2 replies, has 2 voices, and was last updated by
3 years ago
November 1, 2020 at 10:04 pm I have a question about shaft diameter VS shaft log diameter. I am doing a re-power. I need to increase the shaft diameter from 1 3/8 to 1 1/2 diameter. I would like to keep the same shaft log. The inside diameter of the shaft log is 1 15/16 That leaves a bit more than 3/16 clearance around the 1 1/2 diameter prop shaft. How crucial is the clearance between prop shaft and shaft log. Is this enough clearance?
2 RepliesNovember 5, 2020 at 11:49 pm Thanks for the reply. I am starting with nothing but the shaft tube/log in the boat. The strut will need to be replaced. The prop shaft that came with the boat was an 1 3/8 . I will go to an 1 1/2 shaft diameter. I was hoping not to replace the shaft log. My first time doing an inboard/v drive set up. So the extra clearance sounds like a good idea. Your shaft was so miss aligned that it was wearing at the shaft log/tube itself. Allot to le…Last Post by:
posted: 3 years ago
-
Repower 6-71 TIB 485hp to 6BTA M3 370hp
This topic has 8 replies, has 4 voices, and was last updated by
3 years ago
November 2, 2020 at 6:19 pm I purchased this boat with a long term plan of repowering for all the obvious 671TIB reasons. I have been looking for a good deal on some RTO’s and had hoped to find some CTA’s or similar for the project. I have limited budget so it’s been a difficult search. I recently came across a good deal on some RTO BTA M3’s with ZF220A’s and after much deliberation I put down a deposit contingent on running the engines. Befor…
8 RepliesNovember 5, 2020 at 4:08 pm Just came across a pair of QSL9 405’s that will likely be a better fit. Started a new topic titled “Repower 6-71 TIB 485hp to QSL9 405hp”.Last Post by:
posted: 3 years ago
-
Repowering Cummins engine with V-Drive
This topic has 9 replies, has 3 voices, and was last updated by
September 13, 2020 at 9:32 pm I have a question about Re-powering my vessel with a V-drive using a Cummins engine. I am hoping someone can help with this. The manual for the cummins engine states the engine needs to be mounted in a nose up application. Between 3 and 12 degrees nose up. The shaft that is in the boat now sits at 12 degrees. That leaves enough room for a 20 inch wheel on the shaft. The ZF V drive transmission I am planning to buy is a 12 degree transmission.…
9 RepliesOctober 29, 2020 at 9:00 pm Thanks Tony Is it possible for you to modify or supply an X tank that will work in my application? If I could get some of those fittings and water line I could do it myself. Your explanations to these questions sure helps to clarify allot of questions that come up in the planning stages. It can be difficult to understand where to start and what parameters to plan within. there is no written installation manual pertaining to each particular…Last Post by:
-
Repowering a twin screw houseboat with 6bt’s
This topic has 3 replies, has 2 voices, and was last updated by
3 years ago September 25, 2020 at 7:35 pm I’m looking for a nice houseboat with twins that I can repower with the set of 6bt’s. After the repower I’m gonna take a trip from Louisville to new Orleans. Can anyone give me and pointers about what I’ll need to do to get all the gasser parts swapped to run with the diesels? I’m a heavy duty mechanic so the whole making them run isn’t the problem. Ive been reading about wrong prop setup’s and whatnot. …
3 RepliesSeptember 27, 2020 at 11:15 am If I was “attempting” to take on a project along these lines, I’d look for a “house boat’ that has never seen saltwater and one that had a pair of the older Volvo 280 or 290 drives on it.. I have no use for outdrives in general, but I have worked with these in the past and as outdrives go, they are easy to adapt a Cummins 6BT to and seem to hold up OK……………….The lower the numerica…Last Post by:
posted: 3 years ago
-
installing 6bta w/ 220a
This topic has 3 replies, has 3 voices, and was last updated by
3 years ago
April 8, 2019 at 9:02 pm I am about ready to install my 6bta into my 1989 26′ Boca Grande. We have replaced the stringers so we are staring with a clean slate. Need to fab and install the mounts but am trying to figure out an easy way to determine where they need to be and the angle required. Does anyone have any insight on making a template or where i could buy/rent one for ease of making motor mounts on the stringers?
3 RepliesJune 21, 2020 at 6:26 pm Good job! Careful planning can save so much time and effort. In addition to jigging, I like to first draw the project full size on the garage floor, plan view and side view, and various sections as needed. This also helps with planning exhaust and water systems, which are often an afterthought.Last Post by:
posted: 3 years ago
-
Repower Grand Banks 46eu
This topic has 2 replies, has 2 voices, and was last updated by
3 years ago
June 1, 2020 at 7:52 pm Hi all, I am based in Brisbane, Australia. I have a 2006 Grand Banks 46eu (see photo), weight 20,000kg (about 43,000lbs). Current engines are CAT C7s, 455hp at 2800 rpm, driving ZF280-1 A gearboxes and Aquadrive HDL680 thrust bearings. Current hours just short of 2000. I normally cruise at 2300rpm to 2400rpm, and achieve around 14 knots. I clock around 250 hours per year, and do at least one longer trip each year up to the Whitsundays or down to…
2 RepliesJune 12, 2020 at 1:14 am Mr Athens, Thank you for your reply. First, there is another version of this thread floating around – apologies, I could not get the first one (which you have replied to) to load. Helpfully others have responded to the second version of the thread. Secondly, the QSC8.3 will fit and I have gone with that option. Will be a good improvement over the existing power plant. More torque, stronger engine with a track record, installed in lots of G…Last Post by:
posted: 3 years ago
-
Repower Grand Banks 46eu
This topic has 4 replies, has 2 voices, and was last updated by
June 1, 2020 at 10:59 pm Hi all, I live in Brisbane, Australia, and own a 2006 Grand Banks 46eu, weight 20,000kg (about 43,000lbs). Current power is twin CAT C7s, 455hp at 2800rpm, turning ZF280-1 A gearboxes, HDL680 Aquadrive thrust bearings. Engines have just shy of 2000 hours on them, and as a result of aftercooler failures at about 800 hours under the ownership of the original buyer, the engines are toast. Does anyone have a view about Cummins QSB6.7 at 550hp as a r…
4 RepliesJune 2, 2020 at 11:12 am Thank you for the thoughtful reply Steve – that makes sense and I understand what you are saying re fuel burn. Yes we will definitely need to change the prop pitch, although the exisiting gearboxes are good to go with that QSB model. The biggest attraction of that engine is that it is a (comparatively) very easy fit. And if I can cruise all day at 2600rpm without wrecking it then that would be fine. I have already looked at QSL9, and agree…Last Post by:
-
farallon 25 repower
This topic has 4 replies, has 4 voices, and was last updated by
4 years ago January 1, 2020 at 8:13 pm I am going to be acquiring a Farallon 25 straight shaft it was in the process of being repowered with a volvo 8.1 gas engine with a zf 63a transmission. I want to install a mechanical diesel engine in I was wondering what horse power and transmission I needed and pricing. Am I going to need to change the prop shaft is 1 1/4″ strut and shaft log the to accomadate the diesel engine and transmission. Are usual trip is around 250 mile and…
4 RepliesMarch 31, 2020 at 4:57 am Sounds like the 28 Albin powertrain – the most popular setup was the 6LP, ZF63IV at 2:1, 1.5″ shaft, 19×19 4B.Last Post by:
posted: 4 years ago
-
Props
This topic has 6 replies, has 4 voices, and was last updated by
4 years ago March 27, 2020 at 4:21 pm Hi guys! I need to pick your guys brains to help determine if I am over propped. I am really not sure all the information that is needed, but here goes. The boat is a 1973 28 foot Bertram powered by twin Cummins 4BT. According to the survey they are rated at 155 SAE SHP at 2800 RPMs. The shaft is 1 1/8 inch stainless steel. Reduction gear is a twin disc 506, I believe that is 2:1 We normally keep the weight down on the boat to a fishing load o…
6 RepliesMarch 30, 2020 at 2:55 pm We asked for some photos of your entire engine including the exhaust and turbo. You have discovered a frozen turbo. Now you have two choices. 1. You can replace the turbo, most likely engine will run normally, for a while. OR 2. You can show us some pictures as requested and we can help you determine WHY your turbo froze and prevent it from happening again which it will if you just fix the turbo. PhilLast Post by:
posted: 4 years ago
-
Shaft seal water feed
This topic has 7 replies, has 5 voices, and was last updated by
4 years ago July 5, 2019 at 9:33 am Hello guys! I did replace shaft seal for new one,similar like PSS system,and have some worries about seawater cooling for shaft seal. It is a sailboat,it has small Yanmar engine in it,and i did found for me perfect spot for connecting hose to shaft seal,and did put also small valve on this pipe,so i can close it when replacing impeller or other works. Connection is on pipe which goes from seawater pump to heat exchanger. But engine lies just bit…
7 RepliesFebruary 20, 2020 at 10:02 pm Tony’s crew installed the 3/8s nipple fitting for the water feed to the PSS shaft on the distal (aft) end of the heat exchanger. Easy enough to braze a nipple into the bronze end cap and it’s a short piece of hose from there to the shaft seal nipple. The water feed is behind the dry riser. One advantage is the cooling water has passed through the whole SWAC first for max engine cooling before being shunted off to wet lube the shaft s…Last Post by:
posted: 4 years ago
-
Possible shamrock repower
This topic has 2 replies, has 3 voices, and was last updated by
4 years ago
March 21, 2018 at 8:50 am Thinking about repowering a 1987 26 shamrock stalker. Boat weighs about 6000 lbs dry currently with a pleasure craftt 350 gas direct drive inboard. Boat will be used mostly in Arkansas but trailered to coast for some “real” fishing and diving adventures. Currently has 54 gal port and starboard fuel tanks total 108 with about 100 gal usable. I would like to increase speed thinking of around 350 to 380 hp Cummins 6bta? Currentl…
2 RepliesFebruary 13, 2020 at 5:39 pm Hi Tony, I sure wish I was west coast for this repower but I appreciate your contributions for all of us elsewhere in the world. I am repowering my 26′ Shamrock 1990 Open (Center Console) and have a refreshed 6LPA nearby I can put into it. I wonder if you have those photos you referred to above and any performance numbers to justify the “Sham Rocket” moniker? I thank you in advance if you have them and if not thank you again …Last Post by:
posted: 4 years ago
-
Convert Air to Air to JWAC?
This topic has 1 reply, has 2 voices, and was last updated by
4 years ago October 21, 2019 at 2:32 pm I’m looking at a 37′ lobster boat for pleasure, no engine, set up for keel cooling. I have a very good condition 12V 5.9L from a Dodge. Could this engine be used in the application with keel cooling, dry stacked, and JWAC?
1 ReplyOctober 25, 2019 at 8:35 am I am 100% sure it could, but it has to be done right……………………………….Post and engine serial number and some good pics from all around–Many “versions” of the Dodge 12V out there.. And most important, it’s going to come down your your own in-house capabilities and a realistic budget to do a proper marine conversion. That will include an understanding of the…Last Post by:
posted: 4 years ago
-
Repower Skipjack25
This topic has 3 replies, has 4 voices, and was last updated by
4 years ago September 13, 2019 at 8:53 am Hi, new to this site. I have an older Skipjack 25 that I want to repower with a Cummins Diesel. If you know the boat can I get a ball park estimate of that it will cost. I will be needing a new duel prop outdrive as well. Currently its powered by a marine power 5.7 with a volvo 290 out drive Thanks Tony
3 RepliesSeptember 16, 2019 at 3:59 am If you have a $70-100K, can find a new Yanmar 4LHA, have a really good shop at your disposal, and put in a year + of free labor, you could do something like this………………. As to a Cummins, no-go for that hull.. TonyLast Post by:
posted: 4 years ago
-
Shooter the 40 knot Bertram 31
This topic has 2 replies, has 2 voices, and was last updated by
4 years ago
August 12, 2019 at 7:31 am Was wondering if there are any updates on Shooter? she was cruising at 32 knots with Yanmar 6ly2 STP’s and wondered if the engines had lasted . was also interested in details such as EGT,boost, and RPM at that cruise speed. I have a contender 35 with 25 y/o 6ly(m) ute’ s which is reason for my interest. thanks!
2 RepliesAugust 16, 2019 at 10:09 am Thank you Tony Am weighing all my options for possible repower.My boat is obviously old and I don’t think worth it to put in brand new engines.For reasons of simplicity and cost should probably stay with mechanical engines.Qsb 5.9 440 would sure be nice though,but are 8 inches taller than my current engines and likely won’t fit. Good to know the 6ly2 can provide the desired performance and last if used in right application and proppe…Last Post by:
posted: 4 years ago
-
Is it worth repowering a 2008 Sabre 42 flybridge with Cummins QSCās
This topic has 1 reply, has 2 voices, and was last updated by
4 years ago August 4, 2019 at 11:32 am So I want to buy a Sabre 42 flybridge, I want the planing speed, the look, the quality and the fly. I want one that is a 2008 or older because I do not want pod drives and all newer Sabreās are pod driven. However the only ones for sale have the Yanmar 6cx-gte or 6ly-etp and Iāve educated myself on those motors to the point that Iām not willing to own them but I believe I could buy the boat for $300-350k. Alternatively I could buy the sister Bac…
1 ReplyAugust 4, 2019 at 3:28 pm Simple answer to a simple question–NO you will not get your $$ back unless you can buy the boat for under $50K.. What you will get if the repower is done “100% Seaboard Right” is a very usable boat that would meet you needs for years to come…. TonyLast Post by:
posted: 4 years ago
-
86 Bertram 35 repower options
This topic has 3 replies, has 3 voices, and was last updated by
4 years ago September 13, 2018 at 3:04 am Hi, I have an Aussie built 86 Bertram 35. Has twin factory Green Disprins- 255hp Volvo TAMD60C, Twindisc 502 with 2.00 ratio and 10 degrees down angle. Boat weighs 10.5-11.5 tonne depending on load. I do about 400 hours a year Trolling 7 knots @1150 Cruise 16 @ 2200 Tops out 22-23 @ 2800 WOT Yes I know these hulls eat Hp… One engine out and needs a major birthday so time for repower considerations. We are coming into summer here so itās …
3 RepliesAugust 4, 2019 at 8:21 am I just posted a note about re-powering my 38 – going from 410 HP to 720 HP and I increased top end, reduced cruise RPM with the new setup which allowed for the less wear on engines and still better performance and with slightly reduced fuel consumption. My thoughts are that after considering possible engine packages . Pick a series that fits dimensionally and go with the highest HP in the series. You can always throttle back. Usually the w…Last Post by:
posted: 4 years ago
-
Repowering a 43' Delta Marine with 380 hp 5.9 qsb Cummins ??
This topic has 1 reply, has 2 voices, and was last updated by
4 years ago July 15, 2019 at 8:17 pm I’m Thinking of re-powering my 43 Delta Marine with a pair of 380 hp 5.9 qsb Cummins. Wondering if anyone is running these in their 43 Delta’s? If so, what kind of speed/fuel economy would I expect? And if you would have any thoughts on wether it would be a large enough displacement engine to last a few thousand hours of commercial use? Currently the boat has 210 hp 3208 cats. Cruise is 12 knots, WOT is 15 knots. Thanks!
1 ReplyJuly 27, 2019 at 9:04 am Caleb, I have not repowered a 43 Delta with QSB 5.9’s, but for sure they will do you right if set up proper from Day 1.. I have plenty of them out there with well over 10,000 hours of them in commercial use.. Earlier this year I removed a pair from this vessel ( Aloha Spirit — https://www.channelislandssportfishing.com/aloha-spirit-sportfishing ) with right at 30,000 hours on them (all original) .. Still running daily but he got a …Last Post by:
posted: 4 years ago
-
Repower 35 Henriques Pilothouse
This topic has 9 replies, has 3 voices, and was last updated by
4 years ago
March 1, 2018 at 3:18 pm I have a 35 Maine Coaster pilothouse that I am considering downsizing the engine from a 420 to 370 Cummins Is this a reasonable possibility in theory. We use the boat for recreational fishing and don’t need a speed demon. Again this is a boat with a 4kw Onan genset, 300gallons of diesel max and 50 gallons of water if we were full. It is an 18000lb boat I need to repower but budget dictates and I’ve seen another similar boat a 34 Du…
9 RepliesMay 10, 2019 at 7:38 am Good day All, This is a LOOONGGG overdue update: I’ve managed to get the engine out and will be replacing it with an (apple to apple) direct model replacement. 6CTA 8.3-M.2 Upon removing the current engine and tranny, it has been revealed, as expected that the coupling may need replacing. What is currently on the tranny is from VULKAN p/n# 1KT4110104. Is this something that you supply at Seaboard or is there an apple to apple upgrade as it…Last Post by:
posted: 4 years ago
-
Completed Repower of 38 ft Commander
You must be logged in to create new topics.