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Forum: Hatteras Tech Talk

Techinical Discussion & Hatteras Related Topics Only

  1. 671 T smoking badly-grey blue smoke

    Guys, My '76 starboard 671 Turbo (4 Valve) is getting worse. We had a raw water impeller fail two weeks ago (185-190 degrees before shutdown) and misdiagnosed as a thermostat. Replaced that, retested and with new IR thermometer quickly found raw water impeller housing overheated. Engine got to...

    Started by Genevatexan‎, 03-15-2011 05:13 PM
    2 Pages •
    1 2
    • Replies: 19
    • Views: 8,191
    Trojan
    03-17-2011, 03:53 AM Go to last post

  2. 671 TA smoke

    Just surveyed a 49 Gulfstar with 671 TA engines that started from cold immediately with very little smoke for about 5 seconds. As soon as we started running up the RPM’s they started smoking very black smoke at about 1500 and it did not clear up at all. Supposedly all 4 turbos were just serviced,...

    Started by Scarlett‎, 02-02-2019 12:19 PM
    • Replies: 6
    • Views: 1,581
    kelpy
    02-02-2019, 08:40 PM Go to last post

  3. 671 thermestats

    I have a pair of detroit 671s in my 1973 38 dcmy. They run at a temperature lower than 180 degrees, somewhere around 140. The previous owner bought two new thermostats but never installed them. He seemed to think that they don't have thermostats in them currently and that's why they run so cool. If...

    Started by Calm Waters‎, 06-04-2012 05:15 PM
    • Replies: 3
    • Views: 1,780
    Calm Waters
    06-04-2012, 09:19 PM Go to last post

  4. 671 ti engine life

    Been reading on different forums about the 671 485hp engines and what the service life should be. Wanted to see what people have been getting out of these engines. Thanks

    Started by sdgreg‎, 08-04-2015 03:27 AM
    • Replies: 6
    • Views: 2,550
    seasalt
    08-04-2015, 04:47 PM Go to last post

  5. 671 TIB RPM problem

    I have a 1988 38 ft. conv. with 671's rated for 485 HP. During a survey there was one bad injector on each engine so prior owner had all injectors replaced. It originally had M110 injectors and they were replaced with 7255's per Detroit. The boat used to be able to get 2400 RPM WOT with the old...

    Started by TedIII‎, 09-23-2010 08:10 AM
    4 Pages •
    1 2 3 ... 4
    • Replies: 31
    • Views: 21,879
    SKYCHENEY
    03-11-2011, 09:37 PM Go to last post

  6. Question 671's Expected Life

    Looking at a 37 hatteras has detriot 671 naturals with 4500 hrs how long should they last. How many horsepower do they have and how well should they push that boat. Thanks for any info.

    Started by country boy‎, 11-01-2009 11:22 AM
    2 Pages •
    1 2
    • Replies: 18
    • Views: 8,595
    Scott Mather
    11-05-2009, 12:51 PM Go to last post

  7. 671N fuel leak

    Good Afternoon My J&T 671N has a fuel leak . I thought it was around the secondary filter (canister type) or the fuel fitting at the cyl head or maybe the little fuel pump. After replacing the filter and cleaning the area. I ran the engine what appears to be happening is the...

    Started by newinlet‎, 06-22-2009 02:38 PM
    • Replies: 4
    • Views: 1,833
    newinlet
    06-25-2009, 09:43 AM Go to last post

  8. 671N trans cooler

    Good morning, My 671N J&T with twin disc gears has a slight drip of coolant where the trans cooling line goes into the cooler. the cooler is at the bottom of the H/E. There is a large nut I was wondering if I put a wrench on that maybe that is all I need. sorry I should post...

    Started by newinlet‎, 05-19-2010 06:24 AM
    • Replies: 4
    • Views: 1,524
    Boatsb
    05-19-2010, 08:55 AM Go to last post

  9. 671n trouble

    Last trip everything was fine on a 3 hour trip, today when i went to start the stbd engine it cranked but wouldn't start unles I would put the throttle completely forward and when it started the rpms were fluctuating between 650-400. Took the boat out and that engine would not go more than 1200...

    Started by micky‎, 05-25-2014 09:21 PM
    2 Pages •
    1 2
    • Replies: 16
    • Views: 4,296
    spartonboat1
    06-03-2014, 10:39 PM Go to last post

  10. 671N- mixing elbow possible restriction

    Hello all, My 37C With J&T 671N Engines. The port motor engine coolant temp creeps up as the RPM increases It would overheat if I continued over 1900 RPM when under 1900 or so temps fall below 180 I did service the freshwater side. Thermostat, coolant flush fresh 50/50 coolant. I am not loosing...

    Started by newinlet‎, 08-03-2023 03:54 PM
    • Replies: 2
    • Views: 346
    jmooney
    08-03-2023, 10:27 PM Go to last post

  11. 671N- still running warm over 2,000 RPM

    Good morning, I have been woking all summer on an issue with my 671N J&T that in the past simply cleaning the H/E would work This is what I have done so far. Port engine only engine runs smooth Replace impeller end cap and wear cam ( no missing rubber parts) Replace thermostat ...

    Started by newinlet‎, 08-13-2023 08:03 AM
    1 Attachment(s)
    • Replies: 5
    • Views: 341
    Captain Ralph
    08-13-2023, 07:18 PM Go to last post

  12. 671na fuel filter change

    Planning on fuel filter changes this spring. Two canister filters per motor. No racor separators (yet). My previous experience has been strictly spin on filters so this will be a first with canisters. Any advice/experiences would be greatly appreciated.

    Started by Hewett‎, 02-07-2022 09:04 PM
    2 Pages •
    1 2
    2 Attachment(s)
    • Replies: 13
    • Views: 1,476
    Captain Ralph
    02-11-2022, 11:20 PM Go to last post

  13. 671TI 450hp JT Correct Injectors?

    Does anyone know the correct injector for the JT 450HP 671TI? JT originally put M95s in them, but they are no longer available. I would appreciate any knowledge as to what anyone with the same engine is running. I would also be interested in the injector height setting. Thanks John D.

    Started by John Dickson‎, 07-05-2016 05:28 PM
    • Replies: 4
    • Views: 1,747
    captddis
    07-19-2016, 02:35 PM Go to last post

  14. 671TI Blockheater location

    I have a friend who wants to install blockheaters in a671TI. Does anyone have them installed and where are they located? Any pictures would help. Thanks

    Started by Scope‎, 11-20-2014 07:45 AM
    • Replies: 7
    • Views: 1,930
    captddis
    11-20-2014, 08:31 PM Go to last post

  15. 671TI cold start

    Mike P, Here is a cold start on a pair of 450HP 671TI's that have not been started in 5 weeks. Temp of the engines with a IR gun was 70 degrees. The stbd battery was low and I had to parallel it hence the delay.

    Started by captddis‎, 11-11-2010 09:20 PM
    4 Pages •
    1 2 3 ... 4
    • Replies: 37
    • Views: 11,535
    SKYCHENEY
    12-03-2010, 03:34 PM Go to last post

  16. 671ti grey smoke - How much of a mechanic do I need

    The last 2 boat rides I noticed white/grey somoke coming from the stbd engine exhaust at idle after running. Nothing noticable at speed only idle. Also on the most recent trip I smelled diesel. The port exhaust is clear. The engines are Covington 671ti's, 390 hp, 2600 hrs or so. No problem...

    Started by Vincentc‎, 11-28-2010 11:29 AM
    • Replies: 1
    • Views: 1,567
    bigbill
    11-28-2010, 12:10 PM Go to last post

  17. 671TI Hour meter wire???

    1979 37C w/ 671TI covingtons. Both hour meters stopped working 6 months apart. Meters and oil pressure switches are fine. If I put a positive charge on the oil pressure switch when the engines are running the meters work. But where does the other wire that is suppose to provide the positive charge...

    Started by hcalmar‎, 06-22-2012 12:39 PM
    • Replies: 3
    • Views: 1,753
    dsharp
    06-22-2012, 10:31 PM Go to last post

  18. 671TI Main Bearing Cap Cracked after rebuild

    I recently had my 671 TIs rebuilt Then the pistons were all recalled and had to be replaced due to bad slip bearings in the piston One engine only had 6 hours on it since the rebuild but the 12 month rebuild warranty had expired Upon dropping the pan to replace the pistons the tech noticed that...

    Started by John Dickson‎, 07-08-2022 04:19 PM
    • Replies: 9
    • Views: 851
    Captain Ralph
    07-22-2022, 05:48 PM Go to last post

  19. 671TI noise

    I just finished complete cooling system service, hose replacement and commissioning of the 671TI's in our 37. On startup of the starboard engine I hear a slight whine type noise at the front of the engine around the crank pulley. Seems to catch up with engine speed but not directly proportional to...

    Started by nick‎, 05-29-2004 01:18 AM
    • Replies: 6
    • Views: 4,941
    dsharp
    09-29-2022, 08:56 PM Go to last post

  20. 671ti oil capacity?

    I was sitting here trying to buy some Delo 100 for my 671 Covingtons and realized that I didn't know how much they hold? I just got the boat in Jan and haven't changed the oil yet? Anyone have a quick answer?

    Started by Mambeaux‎, 03-16-2007 05:29 PM
    • Replies: 8
    • Views: 2,785
    newinlet
    03-18-2007, 07:43 PM Go to last post

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