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David you need to Man Up.. When someone posts factually bad info and wants to sell it as “gospel”, you know I do not take any prisoners with something like this.. Needs to be stopped cold in its tracks, and you need to learn and understand what I just posted, and then rethink your perceptions...

That did not address the real issue.. Just look at the pics--they had drains.. That was a band-aid to settle a "class action law suit over the production run that used the aluminum aftercooler cores between 1998 and about 2005 ish.. Accomplished NOTHING is the big scheme of...

theories David, You have convinced me that you do not understand the mechanics of what goes on inside these aftercoolers.. Let’s talk about your current statement—Fresh water flushing would not help Look at picture 1—Here is an aftercooler that had a total of 9.5 engine hours but the boat...

David, I've been thinking about this posting for awhile and really need to respond as I feel very strongly you are putting out some very bad info, or at very least, giving mis-guided info based on a very limited amount of field data. My goal here is to help all, not to disagree, but to...

You will be buying a "knockoff" , guaranteed--Plenty of these guys over there that build complete marine engines .. Right off, Cummins NEVER had any mid-range marine mechanical propulsion engine that was EPA T2, that alone should be a RED flag from the get go.. Tony

Cummins does have manufacturing plants all over the world, but understand that the mid-range marine engines that is really what the marine market is all about in this country, are all built here or in the UK..I run into UK engine about 5-10 times a year. The parts to build these engines can...

That's exactly what I wanted..........Plus, I kinda guessed you did it all right.. My thing here was for someone, not me, to show that buying "genuine Cummins" works and is really very cost effective compared ti the "Chinese" knock-offs" that I still am looking for some positive feed back...

Long Block "The other Gary", The engine pictured in your post. 1) Your engine? And is this engine in your possession?? 2) May I ask what it cost "delivered" to you? 3) Please post the CPL of the engine pictured in your post. This is very important if you are doing a rebuild to a...

A couple of links related to this may help: IR Gun Temperature Check - Seaboard Marine Redundant Alarms - The Least Expensive Engine Insurance - Seaboard Marine Tony

Larry, Just an FYI--Header tank temps are very close to the highest temps in a properly operating engine with Cummins mid-range marine engines as discussed here, plus engine coolant circulation is quite high there AFTER the thermostat is open.. The lingo used is "top tank temp" in the...

Marine emissions Just an FYI............ This forum and thread is talking about MARINE propulsion engines in sizes applicable to boats generally in the 20-100 ft range, with 95++% of them in the 30-45Ft range. Tier 4I or Tier 4 final IS NOT applicable to any marine propulsion engines in this...

Low Speed Running My direct experience with CR engines ( since early 2005-ish) leads me to believe that they indeed do better than mechanical engines running at low power settings in relation to there max power ratings or HP used per liter of displacement.. The reason is simple--Each...

The Twin disc MG 507 was common with CAT in those days, but if you really want an accurate answer, you need to read the data plate on the gear.. Or usually, some real good pics of the gear showing all of it will allow me to ID it.. Tony

Diesel Duck vs. the other No clue if this fits into this thread, but a "Diesel DucK" owner I repowered a couple of years ago just sent me this.. Might even make for a nice X-mas card... Hope the Holidays are good for all.. Tony

Diesel Outboards Two things that caught my attention: 1) Not less that 33% of the fuel used turns into heat that goes out the exhaust as unused energy. Dry Manifolds & Turbo's start to glow red at at about 25 HP per liter and are get bright red at 50HP per liter and up...........Just how to...

Exhaust design Of course you want to believe it's ok...........But, I will leave you with this.. Look at this relatively new $2M+ boat -- Our Fleet of Paddle Wheelers & Lake Yacht | Zephyr Cove Resort & Lake Tahoe Cruises New 6.7 and has exhaust system close to exactly like yours as to...

Exhaust Design Bruce, Actually, when I saw this pic a few days ago, I sent to a friend titled "maybe another one doomed to failure"...................Look at my sketch and fill in the blanks. You may want to add in some other relationships too -- All in relation to the LWL, which BTW, that...

Twin Disk Shifting issues Do you remember how this all started? I called the local Twin Disc repair man and he said "It sounds like manifold wear. Bring it in and we can take care of it. $8000 max cost." Glad you listened to reason and looked a tad deeper...... Hopefully those who are...

Thanks for sharing..That's what forums like this are all about.. Favor Please--Can you send me those picture direct in high res? I'll put together a small "how to" for others to see.. Thanks, Tony tony@sbmar.com

Bruce, Lookin' Really Good.............. Glad you are taking lots of pics along the way...That will pay major dividends years from now. Tony

Repowering a "Duck" We did a 40+ ft “DUCK” about 2 years ago.. Replaced a 4-71 with a commercially set up 6BT 210 but deturned it and also used a very heavy duty 3:1 gear.. Weight was not an issue and it work “super” in the 1000-1600 RPM range.. Super smooth and super quite.. Ski is right...

You DO NOT want non-detergent oil.. Per Twin Disc, you want HD SAE 30W ( Like Rotella T or Delo 400)for most climates and 90% of the gears.. A few specify 40Wt, but NEVER non-detergent.. Nor sure where you got that info.. Tony

Anchor gear--If you want to sleep at night I learned years ago there is only one anchor that would let me sleep good at night.. Tony

Moving Past Boatdiesel Carolena, The "politics" of sharing information, regardless of where it came from, went beyond what I thought was the purpose of what informational forums like this one were all about.. This is: To share all and learn from everyones experiences and hard work so all...

Prop shaft failures Just in case you want to think about a different very possible answer as to "why"....................................For the past 30 years dealing with these "unknown failures" this is what we have seen most shaft failures result from right at the beginning of the taper...