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- Cummins Marine Forum Topics
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Prop set back from face or transom
This topic has 6 replies, has 4 voices, and was last updated by
1 year ago May 17, 2022 at 2:15 pm Ā Ā Is there some sort of formula for the distance from transom face to closest prop. blade?Ā Ā How do I know how far under the hull the prop should be? Ā The picture shows the prop blade being 2 1/2 inches from the face of transom. In this position I can take the prop off without removing the rudder. The rudder is a transom mount rudder.Ā Ā I am more concerned with being too close to the transom face.Ā How do I know where the prop should be positi…
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in: Boats & Repowers
6 RepliesMay 30, 2022 at 4:25 pm Darren, Ā I really do not think there is a cut & dry answer to your question.. All has to fit, allow clearance for the prop to R&R it ( hopefully without pulling the rudder), all tip clearance, allow a minimum space between the prop hub and a cutless bearings, etc. Every boat is different.. Ā I grabbed of few pics –As you can see, the mountings/setupsĀ are all over the place.ĀLast Post by:
posted: 1 year ago
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Prop clearances/distance. Two questions.
This topic has 4 replies, has 3 voices, and was last updated by
2 years ago
January 9, 2022 at 10:21 pm Ā Ā Can someone clear up these clearances/distances for me. Ā What is the recommended clearance from the prop to the underside of the hull.Ā Also. I have a transom mounted rudder. I understand the idea of having enough clearance from prop to rudder to change the prop without removing the rudder. What is the distance from the prop to the face of transom. Is there a Min. that should be observed?Ā Will there be cavitation issues if the prop is too c…
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4 RepliesJanuary 11, 2022 at 10:00 pm Ā Ā Ā Ā Ventilation?Ā is this a condition where air can enter the prop wash/ prop from the end of transom into the prop? Looking at some drive examples where props on some boats appear to be close to the face of the transom, I have seen that the transom has been extended in the area above the prop. Is this a solution to prevent Ventilation? Ā Ā Thanks for your advice and knowledge.Last Post by:
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Gear and engine bed/supports
This topic has 5 replies, has 4 voices, and was last updated by
3 years ago February 15, 2021 at 7:24 am Working through a re-power. Two part question.. Using a ZF68IV gear and a 6bta 315 H.P. engine. The mounts for both the gear and the engine line up almost dead center of boat Stringers. I need to drop my gear down into the stringer. This means that I need to cut into the top of the stringer about 2″ deep. The total depth of the stringer is 7″ and 4″ wide. My first instinct is to box the stringer with aluminum, bolting a weld…
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5 RepliesFebruary 20, 2021 at 8:42 am Darren, I see two very viable solutions here………………Send me those pics and more, direct——————-.jpg attachments–Not embedded in the emails or they go into the round file ……………… Add a few more too.. Lay you camera in the bilge, both ends, and shoot a pic so I can see under the engine and gear. But before anything can really be done, the…Last Post by:
posted: 3 years ago
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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…
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in: Boats & Repowers
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
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prop shaft coupler
This topic has 2 replies, has 2 voices, and was last updated by
November 9, 2020 at 9:25 pm Question about couplers…..I am presently looking for a coupler for my prop shaft to ZF V drive transmission. It isn’t difficult to find companies willing to sell couplers, however it can be difficult to get the needed information about the differences between couplers and how it may apply to my particular re-power. With that being said, re-power is a 6 bta cummins. 315 H.P. a ZF68IV trans. What kind of coupler is more appropriat…
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2 RepliesNovember 11, 2020 at 11:14 pm 1. Prop shaft will be new. has not been ordered/made yet. Starting from Scratch. 2. Prop shaft is aprox. 5’5″ long Need to fit Transmission and get proper length of Prop shaft. 3. Prop shaft diameter is 1.5 inches 4. Prop Diameter is 20″. I would like to do the final fitting to the shaft.Last Post by:
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shaft log and shaft diameter
This topic has 2 replies, has 2 voices, and was last updated by
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?
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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:
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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.…
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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:
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6 cta fan belt cover
This topic has 3 replies, has 4 voices, and was last updated by
5 years ago May 3, 2018 at 7:20 am Getting ready to replace the belts and want to get some hints as to how to remove the cover at the front of the engine? Seems that the nuts on the brackets are on the inside of the cover except one? Please help.
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in: Cummins Marine Engines
3 RepliesMay 8, 2018 at 2:29 pm Any brand oil that meets spec is fine. Most choose Dino oil since itās cheaper and the synthetic. There are lots of good brands and unlike other color engines that specific oil seems to cure an issue here and there Cummins do just fine with plain Dino oil…. Delo, Mobil, Shell Rotella, Valvoline, etc… they all work just fine. Once it meets spec spend the money on a quality oil filter (fleetguard) and regular oil changes are all you ne…Last Post by:
posted: 5 years ago
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Prop set back from face or transom
