distributor question
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HT4100 4.1, 4.5, 4.9 Discussion, distributor question in Cadillac Engine Technical Discussion; where is the top dead center on a 4.5 distributor. i got to wires figured out but i think i ...
  1. #1
    quins90lac's Avatar
    quins90lac is offline Cadillac Owners Enthusiast
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    distributor question

    where is the top dead center on a 4.5 distributor. i got to wires figured out but i think i jumped a few teeth in one detection or another so im going to put it at TDC and go from there. i have a FSM but all it say is position the rotor between the #1 &#8. if this don't work it going to the mechanic to figure out whats wrong.

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  3. #2
    ehall's Avatar
    ehall is offline Cadillac Owners Connoisseur
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    Re: distributor question

    TDC refers to the #1 cylinder being at the top of the compression stroke

    Not sure I understand exactly what you're asking

  4. #3
    quins90lac's Avatar
    quins90lac is offline Cadillac Owners Enthusiast
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    Re: distributor question

    like you looking down at the top of the distributor with out the cap on where dose the rotor need to point for TDC on the distributor.

  5. #4
    ehall's Avatar
    ehall is offline Cadillac Owners Connoisseur
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    Re: distributor question

    On mine, the square block for the coil wires on the side of the distributor cap points between the throttle body and the EGR


  6. #5
    quins90lac's Avatar
    quins90lac is offline Cadillac Owners Enthusiast
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    Re: distributor question

    im talking about in the procedure to reset TDC if its lost . in the FSM its page 6d4-5 section D of the procedure.

  7. #6
    daniel58 is offline Cadillac Owners Fanatic
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    Re: distributor question

    With the harmonic balancer at the TDC mark the rotor should point to #1 in the distributor cap. It will turn a bit when you install the distributor so you have to allow for that so its pointing to #1 when seated.

  8. #7
    dennis93coupe's Avatar
    dennis93coupe is offline Cadillac Owners Connoisseur
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    Re: distributor question

    Here's what I would do...
    1. Remove #1 spark plug
    2. Place your finger over #1 spark plug hole and turn crankshaft in the correct rotation slowly until compression is felt. (this will indicate if you are on the compression stroke for #1)
    3. Align timing mark on pulley to ")" on engine timing indicator.
    4. Turn rotor to point between #1 and #8 location on you distributor cap.
    5. If you can't get the rotor to align between #1 and #8 and drop in, pull the distributor out and turn the oil pump shaft about 10-15 degrees. Distributor should drop in and rotor should point close to #1.

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