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Old 11-24-2021, 10:36 AM   #1
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Detroit Diesel 4-71 NA

Any general knowledge about these engines in general and suitability for pushing a Hatteras 58 at displacement speeds? I believe they are 175hp each. Not much extra in reserve I'd think, but maybe adequate for ICW/inshore cruising? Hours unknown at this point.

Thanks.
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Old 11-24-2021, 11:06 AM   #2
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175HP seems high. Screenshot from boatdiesel.com
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Old 11-24-2021, 11:14 AM   #3
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If I remember correctly some of the Hatts., the LRC 58' used them. THe 65' LRC went for the 6-71s.

THose boats were intended to be slower passagemakers, not planing boats by any means.

I did meet someone that brought his 58 LRC to the Broughtons, mid west coast B.C. from Hawaii but that was 20 +yrs ago. He did have the 4-53s.


You might also consider looking up the Hatteras forum and asking there.

https://www.samsmarine.com/forums/index.php
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Old 11-24-2021, 11:31 AM   #4
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@mike66, with over 450 posts you're not new here and I'm surprised you haven't read the many, many previous threads on Jimmies.

Personally I'm surprised they didn't put 3-71's or 4-53's in that boat. My 65 footer had twin 6-71's and it was way over-powered. I wish I had a single 6-71 instead. I ran 1325 rpm at 8.25 knots and did not like running those engines so slowly, especially on those continuous, 5-7 day long runs.
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Old 11-24-2021, 11:38 AM   #5
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Detroit 471 is more in the 130HP range. For a 58 footer you would need two
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Old 11-24-2021, 11:49 AM   #6
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Just getting started on my research. Own a Lehman single and know quite a bit, but no reason to know anything about Detroits. The Hatteras has twins.
Just was looking for any feedback on general reliability such as Great!, Run Away! Easy to maintain!, nightmare!, that sort of stuff. I am a 95% DIY type of guy. Seems being NA it cuts down on some maintenance, probably overall engine stress by not being pushed to produce too much power.
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Old 11-24-2021, 12:13 PM   #7
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The 6-71 is probably the most common engine in the world. The 4-71 is basically all the same parts. I think this is a better engine than the 4-53 but we are talking insignificant differences. I see no reason to run and finding service and parts will be easy.
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Old 11-24-2021, 12:20 PM   #8
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We were looking at 53 LRCs a couple of years ago. It had 471s in it. They are a great engine, easy to maintain and parts are available everywhere and fairly reasonable in prices. I posted a speed vs rpm vs fuel burn that we found on one of them. I no longer have the table, when we decided to go with an express cruiser I deleted all the Hatteras stuff. You may be able to find it here on TF by searching, maybe. I loved the boat but my wife couldnít get past how dirty it was so we didnít make an offer on it. Great layout.
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Old 11-24-2021, 12:40 PM   #9
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We were looking at 53 LRCs a couple of years ago. It had 471s in it. They are a great engine, easy to maintain and parts are available everywhere and fairly reasonable in prices. I posted a speed vs rpm vs fuel burn that we found on one of them. I no longer have the table, when we decided to go with an express cruiser I deleted all the Hatteras stuff. You may be able to find it here on TF by searching, maybe. I loved the boat but my wife couldnít get past how dirty it was so we didnít make an offer on it. Great layout.
https://www.trawlerforum.com/forums/...23&postcount=3
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Old 11-24-2021, 12:46 PM   #10
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8 knots 1400 rpm. Seems like an ideal point
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Old 11-24-2021, 12:46 PM   #11
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71 series Detroits are great for a DIY guy. I've got a thread here detailing an overhaul of a 671, it's really the same engine, just two cylinders longer.

If have a bit of clearance in the engine room you can do an in-frame rebuild right there in the boat if you so desired. If you can find an old salt to show you how to run the rack and tune the governor you'll be able to do all your own work on one no problem.
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Old 11-24-2021, 01:16 PM   #12
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Some how this was a duplicate!
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Old 11-24-2021, 01:46 PM   #13
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If OP wants to run those 4ís a bit warmer (say 1600-1700 rpm) then itís easy enough to use smaller injectors. Could drop the rating down to the 110-120hp range. Repitch your props.
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Old 11-24-2021, 02:03 PM   #14
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Yup, that is it, thanks for finding it. And my thumb looks great, doesn’t it…
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Old 11-24-2021, 02:05 PM   #15
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71 series Detroits are great for a DIY guy. I've got a thread here detailing an overhaul of a 671, it's really the same engine, just two cylinders longer.

If have a bit of clearance in the engine room you can do an in-frame rebuild right there in the boat if you so desired. If you can find an old salt to show you how to run the rack and tune the governor you'll be able to do all your own work on one no problem.
In the 53 Hatteras LRC there is about 6í6Ē, or more, of headroom in the engine room. Quite a bit on the outboard side too. Great engine room to work in.
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Old 11-24-2021, 02:53 PM   #16
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71 series Detroit is probably one of the best engines ever made some I will argue the 60 series is better nevertheless one of the best engine that you could possibly have fairly easy to inframe as already been stated most of the people reading this form should be jealous of that Engine
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Old 11-24-2021, 03:20 PM   #17
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Best of all, they are really, really quiet. Hence the double layer of foam earplugs and ear muffs that I always wore, just to be stylish of course.
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Old 11-24-2021, 03:46 PM   #18
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Best of all, they are really, really quiet. Hence the double layer of foam earplugs and ear muffs that I always wore, just to be stylish of course.
Ha ha, at least they have a throaty sound not an annoying whine.
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Old 11-24-2021, 04:12 PM   #19
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The inline 71 series are probably the most reliable Detroit, but 53s are a close second. I've been running them or most of 60 years, private, commercial, and in the military. If you learn the adjustments, they are very reliable, low maintenance engines. But don't let the average marina mechanic touch them. I suppose a marina mechanic could learn to change oil and with some instruction, the fuel filters. There is no bleeding necessary like injector pump engines.

If you keep the fuel and oil clean, once the adjustments are made, they go about a decade with just the occasional check. I run 2 micron fuel filters and haven't changed an injector since 2011 when I had these rebuilt. Until covid, about 500 hours a year.
My engine room is well insulated and directly under the salon. At full rpm, twin 671s, I can carry on a typical conservation. You push the button, warm them up, and go.
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Old 11-24-2021, 04:47 PM   #20
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My old fishing partner has a 3-71 in a 53 foot skookum. Puts 6000 hours a year on it. Rebuilds it every 5 years. Engine has been rebuilt 3 times so over 100,000 on it. Not sure how you can get much more reliable than that. Trusts that engine all year long in the gulf of Alaska and the Bering Sea.
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