Click for Detroit Diesel manuals!
Results 1 to 3 of 3

Thread: Drain plug?

  1. #1

    Default Drain plug?

    The coolant in my coolant overflow bottle was looking cloudy. As far as I know, the coolant has probably never been flushed/replaced over the life of the engine (1984.) Is there a coolant drain plug somewhere on the DD 671?

  2. #2
    Join Date
    Nov 2009
    temecula, ca., usa

    Default Re: Drain plug?

    There are pipe plugs all over that engine. They would likely be either hex head brass or 3/8" or 1/2" square drive. Some for oil gallery and some for water jackets in the head and block. Sometimes people will remove one or two and install "block drains" in the form of pet-cock valves. But stock from DD it probably won't have any. There may also be a plug in the thermostat housing and one or two that you might get to in the water pump casting. If you poke around you should be able to find one to suit your draining needs.
    Good luck.

  3. #3
    Join Date
    Sep 2015

    Default Re: Drain plug?

    the drain plug is located at the bottom of the radiator.

Similar Threads

  1. Drain plug
    By sonama in forum Crusader Marine Engine Forum
    Replies: 10
    Last Post: 10-24-2013, 06:04 AM
  2. Replies: 1
    Last Post: 06-16-2010, 09:37 PM
  3. drain plug
    By rhollo in forum OMC Sterndrive and Inboard Forum
    Replies: 2
    Last Post: 05-27-2010, 12:07 AM
  4. Drain plug for oil
    By bendix in forum Other Gas Inboard Mfgs IO and Sterndrive Questions
    Replies: 3
    Last Post: 06-14-2006, 10:09 PM
  5. Oil drain plug on MCM 470
    By rick in forum Archive 2002-2006
    Replies: 1
    Last Post: 09-18-2003, 05:11 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