Logo
Click for Detroit Diesel manuals!
Results 1 to 8 of 8
  1. #1

    Default black smoke under load with 671ti

    so i have a 93 luhrs 3800 tournament series with twin 671 ti's the problem is i get a lot black smoke and sometimes some unburnt fuel and/or oil out the exhaust. it is happening with both engines and since this has started i have had the fuel tank polished, changed the fuel/water separators, both of the air seps, and the fuel filters. it still wont climb higher than 1200 rpm's without blowing out tons of smoke and really seems to struggle to get up any further then that. also when its not under load i can easily get up to 1800 rpms with no smoke.

    any ideas?????

  2. #2
    Join Date
    Sep 2010
    Location
    Jersey Shore
    Posts
    4,567

    Default Re: black smoke under load with 671ti

    When was the last time the inter-coolers after-coolers(If equipped) were serviced? Lack of air flow will cause tons of black smoke.

  3. #3

    Default Re: black smoke under load with 671ti

    OK, this might sound bad but don't know when they were serviced.. i bought this boat in 08 and they told me the engines were completely over-hauled and i had a marine inspector and mechanic come out, they both gave it there stamp of approval. i also believe they are 671 ti's not 671 tia's so they might not have an after-cooler... i also don't know what i should be looking for when you say inter-coolers(sounds horrible i know, but i am still learning all about these engines)

    also would i be able to service the inter-coolers or should it be a professional??

  4. #4
    Join Date
    Sep 2010
    Location
    Jersey Shore
    Posts
    4,567

    Default Re: black smoke under load with 671ti

    Get a shop manual on your engines and it will show you how to do this. Just take your time, you can do it.

  5. #5
    Join Date
    Nov 2009
    Location
    temecula, ca., usa
    Posts
    2,614

    Default Re: black smoke under load with 671ti

    There are three "types" or categories for air coolers:

    Air charge cooler= air enters the intake ducting, gets filtered then to a cooler then to the turbo and on to the engine.

    Inter-cooler= air enters the intake ducting, gets filtered, enters the turbo then enters the cooler and on to the engine.

    After-cooler= these are coolers placed underneath (or after) the blower and heat is transferred through engine cooling system. The blower can oil the after-cooler, causing it to clog and reduce air flow. This could cause your symptoms if the rotor seals begin to leak.

    Filtration is the first place to check though.

  6. #6
    Join Date
    Sep 2001
    Posts
    434

    Default Re: black smoke under load with 671ti

    Check air inlet into engine room.

  7. #7
    Join Date
    Jul 2011
    Location
    Cranston RI
    Posts
    9

    Default Re: black smoke under load with 671ti

    Take air sep filters off and see if turbos turn freely. If not you have found problem. Mine froze up over winter and could not go over 1100 without smoke. Bad exhaust elbows caused tubos to fail.

  8. #8

    Default Re: black smoke under load with 671ti

    Hi,

    It is possible to refurbish charge air coolers depending on the condition. I work for a company called vestas aircoil who design and manufacture charge air coolers.

Similar Threads

  1. 1GM10 black smoke dirty black discharge
    By direstraits in forum Yanmar
    Replies: 3
    Last Post: 01-28-2010, 04:07 AM
  2. 671 black smoke under load
    By chopper272 in forum Detroit Diesel
    Replies: 4
    Last Post: 10-04-2009, 09:24 PM
  3. Volvo Penta MD1B black smoke at full load
    By lavaux in forum Volvo Penta Diesel Archive 2004-2009
    Replies: 5
    Last Post: 05-30-2008, 12:34 PM
  4. Yanmar blowing black smoke under load
    By virgin_traders in forum Yanmar
    Replies: 2
    Last Post: 10-31-2007, 10:51 PM
  5. TAMD72A Black Smoke heavy load at 50%25 RPM
    By castaline_fisheries in forum Volvo Penta Diesel Archive 2004-2009
    Replies: 0
    Last Post: 09-10-2007, 08:40 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •