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block heater

  1. Why are these things so hard to start in the Cold?

    Cummins Tech Section
    I have some ideas, but is it one thing or many things that make these 4bts so hard to start in the Winter? I assume: Cold air is harder to compress further Cold air wont be as high a temp at the top of the stroke Batteries dont put out the amperage at Cold temps Cold oil is harder...
  2. Block heater wiring

    Cummins Tech Section
    Got a question, My engine came with a block heater but the guy who pulled the engine from the bread truck cut the wire mid length and trashed the plug. Im trying to wire a new plug on the wire and Looking at the end that screws on to the block, it appears that either wire can go to hot or...
  3. block heater o-ring

    Cummins Tech Section
    hello, new here, first posting. am wondering if anyone has a part number or, lacking that, the dementions of the o-ring seal for the round block heater that mounts in a core plug hole. any help will be greatly appreciated. thanks, bill. (ps. 4bta)