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- Cummins Marine Forum Topics
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Build a lift muffler
This topic has 2 replies, has 2 voices, and was last updated by
1 year ago
October 24, 2022 at 11:26 pm Iāve got a big in-line wet muffler, about 12ā diameter and easily 36ā long, 5ā in and out. Ā My take on it is that itās so roomy inside that it does little to reduce sound level. IāmĀ wondering about the feasibility of converting it to a lift muffler in hopes of making the exhaust quieter, adding a starboard side exhaust for North Sea style outlets. Ā <br />What I donāt know is if there are certain specifications that I need to follow in buil…
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in: General Discussion
2 RepliesNovember 7, 2022 at 5:08 pm Please excuse my ignorance of terminology, is 3āx 3 or 3.5ā mean that the exit tube is 3 or 3.5ā off the bottom of the muffler? Ā Ā Also, I notice that all the commercial lift mufflers are quite short (vertically) , would making it taller make it quieter? Ā I found this drawing online that is just Ā what I want to replicate.Last Post by:
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Kobelt parts
This topic has 2 replies, has 2 voices, and was last updated by
April 28, 2022 at 2:23 pm I need some small parts to complete installation of Kobelt controls, and Iām Ā not getting support from my local dealer, so posting here in hopes of finding another source. Have emailed Kobelt directly, no reply. I need a chain kit for a 2091 control head, and two cable ends with pins for 33 cable. Any help is appreciated!
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2 RepliesApril 29, 2022 at 5:41 pm Thanks, Clark, I doubled down on the local distributor, and he finally agreed to order the parts. Ā He doesnāt keep any inventory, and doesnāt like to sell small orders, not real kosher, but theyāve got us over a barrel here.Last Post by:
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Timing gear cover
This topic has 1 reply, has 2 voices, and was last updated by
3 years ago
November 5, 2020 at 10:23 pm Iām replacing the timing gear cover due to rust damage, having some difficulty identifying the part locally. Is the marine part same as the automotive? The parts house wants to know if the motor has a āPā pump, I donāt know?. Can anybody shed some light on this? Motor is 180hp. 6BT. Cpl 2891 Thanks
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1 ReplyNovember 6, 2020 at 7:50 pm Cummins part number for my 4 BTA. 3918675 Most likely the same if you have a B series.Last Post by:
posted: 3 years ago
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Location of pressure sensor?
This topic has 9 replies, has 4 voices, and was last updated by
December 21, 2018 at 3:38 pm I have a Twin disc 506 gear, bought the sensor and gauge (thanks Cory!), ran the wires, ready to install. whatās the best location for the sensor? Thank you!
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9 RepliesJuly 17, 2020 at 8:54 am Just call SB Parts dept, theyāll set you up with.the right stuff! I canāt remember the numbers.Last Post by:
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Gear oil cooler upgrade
This topic has 1 reply, has 2 voices, and was last updated by
3 years ago July 5, 2020 at 12:25 pm Iād like to upgrade my motors gear oil cooler, as Iām now experiencing external leaking on my second oem unit, obviously not designed to survive in the real world. Thereās no zinc, and theyāre obviously thin metal. Iāve got a 6 BT, 180 hp, with a TD 506 transmission, 1 1/4ā raw water hoses. The problem is selecting from the 30 some coolers offered in the catalog here!
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1 ReplyJuly 5, 2020 at 5:32 pm Have we failed here? With literally 100’s of variations of gear coolers sizes out there, we put this there to help.. Tell me what we need to to do to make it better.Last Post by:
posted: 3 years ago
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Adding a helm
This topic has 4 replies, has 3 voices, and was last updated by
February 7, 2019 at 6:54 pm My boat has an old Hynautic steering system, from which the pressure can and relief valves have been removed with positive resultsāsmoother operation with less effort to turn the wheel. Iām now installing a second helm station at the transom, and wondering if I need to run a third line from the new helm back up to the reservoir? This type of helm pump does not have an internal reservoir, and a reservoir tank at the lower helm could not be vented…
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4 RepliesFebruary 12, 2019 at 10:29 pm Thanks, Iāve been thinking it all through, and have also come to the conclusion that adding a second reservoir would not work, Iāve got to run a third line forward to the reservoir at the high point of the system.Last Post by:
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Propeller Calculator?
This topic has 2 replies, has 3 voices, and was last updated by
5 years ago January 7, 2019 at 9:59 pm I enjoyed using the prop calculator on boat diesel, but havenāt subscribed there lately, anybody know where I could find a good online calculator?
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2 RepliesJanuary 8, 2019 at 9:27 pm Vicprop is the goto and you can cross reference with the Michigan Wheel Calculator as well. https://www.miwheel.com/inboard-propellers/prop-it-now/Last Post by:
posted: 5 years ago
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Hynautic helm ID
This topic has 3 replies, has 2 voices, and was last updated by
5 years ago December 21, 2018 at 3:24 pm Iāve got a Hynautic helm pump that dribbles a bit from the shaft seal, which crumbled on disassembly, so I dont even have a sample part to match. The helm pump lacks any kind of ID plate or stamp, wondered if anyone was familiar enough with these items to identify it? Thanks!
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3 RepliesDecember 27, 2018 at 7:26 pm Parts have always been fair priced………….Sounds like you are “going for it”.. Take some pics along the way and post what is involved.. It’s really nice to share what you “see” and learn to help others.. .. TonyLast Post by:
posted: 5 years ago
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EGT temps?
This topic has 7 replies, has 4 voices, and was last updated by
6 years ago June 1, 2017 at 9:32 am I put an EGT gauge on my 6bt cpl 2891 Cummins motor, and it works well, but I can’t find any guidelines as to what the readings should be. I am seeing less than 400 deg at idle 600 at 1500 cruise 700 at 1600 cruise Then a gradual rise to about 900 at wot, which is only for a few moments if at all. Coolant temp is very stable at right around 180, c…
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7 RepliesJune 4, 2017 at 5:45 am Don, I’ve had EGT senders and gauges on three of the five 6BTA 370s I’ve owned in two boats. The twin 370s in my 31 Blackfin were propped to 3100 WOT which is under propped for the engines and that is good. EGTs at cruise rpms averaged 825F-850F . These 370s had the factory 180F Tstats. The 31 Blackfin weighed in @ 16,000 lbs and is a beast to push through the water. My newest 370 is in a 25 foot lobster boat. This 370 has a SMX hi…Last Post by:
posted: 6 years ago
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raw water pump gizmo
This topic has 3 replies, has 3 voices, and was last updated by
January 2, 2017 at 5:08 pm Just ran across an ad for an item called “Speedseal Life” , it’s an impeller cover with a teflon disc and Ā wingnuts, said to double impeller life, and make impeller changes less painful. I don’t have problems with impeller life, as I change them (Seamax) annually anyway, but I do run a single engine boat in some remote areas, known for their nasty conditions, so my interest in this gizmo is in the area of making the pump …
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3 RepliesJanuary 4, 2017 at 5:36 pm Thanks for the replies, and yes, their website was a bit hokey! The O ring cover with thumbscrews is not a half bad idea though, sometimes getting a wrench in there along with a hand to turn it (blind) is asking a lot, and paper gaskets are too delicate to be using where you can’t see. Rob, I’m not a movie guy, I just like the word “gizmo”. I looked it up, and it means “An unspecified or unspecifiable object; someth…Last Post by:
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Build a lift muffler
