Perkins 4.108

Discussion in 'Diesel Engines' started by roberttigar, Sep 30, 2016.

  1. roberttigar
    Joined: Sep 2016
    Posts: 1
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Fl

    roberttigar New Member

    I am about to replace th thermostat in my 4.108. What temp should it be? 180? 160? or?
     
  2. The Q
    Joined: Feb 2014
    Posts: 143
    Likes: 8, Points: 18, Legacy Rep: 21
    Location: Norfolk, UK

    The Q Senior Member

  3. Chuck Losness
    Joined: Apr 2008
    Posts: 311
    Likes: 37, Points: 28, Legacy Rep: 135
    Location: Central CA

    Chuck Losness Senior Member

    I have a perkins 4108 in my Gulfstar 37 I run a 160 thermostat and my engine temp stays between 170 to 175. In really cold water the engine may come down to 165 and in the warm water in Mexico my temp would sometimes get up 180. I have a friend who runs a 180 thermostat in his 4108 and he seems to be forever fighting an overheating engine. The least little blockage anywhere in the cooling system and his 4108 overheats. My original Perkins manual list an operating temperature range of 150 to 200.
     
  4. Lepke
    Joined: Sep 2015
    Posts: 81
    Likes: 6, Points: 8, Legacy Rep: 10
    Location: Oregon to Alaska

    Lepke Junior Member

    Diesels run more efficiently at higher temperatures. My 1972 4108 runs a generator at 1800 rpm. With a 180° stat runs 175° unless under a full load and then 180°. With a 160° stat it uses about 5% more fuel. I am rarely in water above 55°.
    My Ford F-250 diesel gets 7-8% better economy with a 205° stat opposed to the stock one.
     

  5. Chuck Losness
    Joined: Apr 2008
    Posts: 311
    Likes: 37, Points: 28, Legacy Rep: 135
    Location: Central CA

    Chuck Losness Senior Member

    Lepke
    You may want to check your thermostat because if you have a 180 and the engine rarely gets to 180 your stat is probably stuck partially open. Just a thought after reading your post.
     
Loading...
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.