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firing order for the cadillac flathead..please!

Discussion in 'The Hokey Ass Message Board' started by 47fordcoe, Oct 8, 2007.

  1. 47fordcoe
    Joined: Dec 8, 2005
    Posts: 266

    47fordcoe
    Member
    from San Diego

    what up HAMBers...
    ....getting started on my caddi flatty...I need to make new plug wires but I need to know the firing order..I poked around and couldn't find anything...I know there are a few guys here that are the guru's at these engines....please chime in fellas!!
    Aaron
     
  2. Firing order for a Cadillac 346 is 1-8-7-3-6-5-4-2

    #1 is passenger side front
     
  3. Ebbsspeed
    Joined: Nov 11, 2005
    Posts: 5,009

    Ebbsspeed
    ALLIANCE MEMBER

    1 8 7 3 6 5 4 2 for the 1936 to 1941 V8's, as well as the post-war flatheads. The 1935 firing order is 1 2 7 8 4 5 6 3. If you happen to have a 1935 or 1936 LaSalle motor (looks the same as Cadillac, crank and some other components are different) the firing order is 1 6 2 5 8 3 7 4. LaSalle 1937 and later is the same as the later Cadillac flatheads.

    I assume you're talking the V8, right?
     
  4. 47fordcoe
    Joined: Dec 8, 2005
    Posts: 266

    47fordcoe
    Member
    from San Diego

    yes it's a V8 346 and the year is 48....has a hydro tranny still attached but this sucker will not rotate.....tried every gear position but still will not rotate....any ideas.....it moves a little but not a compleat revolution...any input would help..Aaron
     
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  5. Mizlplix
    Joined: Jan 8, 2007
    Posts: 170

    Mizlplix
    Member
    from S/W USA

    Ach....It sounds like something is in one of the planetary sets...

    Disassembly is indicated, dont force it.
     
  6. 47fordcoe
    Joined: Dec 8, 2005
    Posts: 266

    47fordcoe
    Member
    from San Diego

    more info please......at first I was think I need to pull the heads...so you think it's in the tranny!!!!
     
  7. Where the hell were you guys so quick off the mark when I asked the same question!?!

    Good luck with the start, 47. Ironically I need new wires made up too!
     
  8. 47fordcoe
    Joined: Dec 8, 2005
    Posts: 266

    47fordcoe
    Member
    from San Diego

    come on caddi fellas!!!!
     
  9. Reverend_Grimm13
    Joined: May 8, 2007
    Posts: 361

    Reverend_Grimm13
    BANNED
    from Yucaipa

    Engine Specifications: 1948 Cadillac 346 V8. GENERAL SPECIFICATIONS ... Firing Order: 18736542 (front to rear: Right bank 2-4-6-8, left bank 1-3-5-7)

    Passenger side first cylinder is #1
     
  10. Reverend_Grimm13
    Joined: May 8, 2007
    Posts: 361

    Reverend_Grimm13
    BANNED
    from Yucaipa

    Here's all info for 1948..

    <TABLE cellSpacing=0 cellPadding=0 border=1><TBODY><TR><TD align=middle>Year</TD><TD noWrap align=middle>Prod
    Total
    </TD><TD align=middle colSpan=2>Model
    Designation
    </TD><TD noWrap align=middle>Wheel
    base
    Inches
    </TD><TD noWrap align=middle>Weight
    Min/Max
    </TD><TD noWrap align=middle>Tire
    Size
    </TD><TD noWrap align=middle>Wheel
    Bolt
    Pattern
    </TD><TD noWrap align=middle>Valve
    Location
    </TD><TD noWrap align=middle>Bore
    and
    Stroke
    </TD><TD noWrap align=middle>Piston
    Dis
    place
    ment
    Cubic
    Inches
    </TD><TD noWrap align=middle>Com
    pres
    sion
    Ratio
    (Stan
    dard)
    </TD><TD noWrap align=middle>Maximum
    Brake
    H.P.
    @
    R.P.M.
    </TD><TD noWrap align=middle>Spark
    Plug
    Type
    </TD><TD noWrap align=middle>Spark
    Plug
    Gap
    </TD><TD noWrap align=middle>Point
    Gap
    </TD><TD noWrap align=middle>Firing
    Order
    </TD><TD noWrap align=middle>Ignition
    Timing
    BTDC
    or
    Mark
    </TD><TD noWrap align=middle>Grnd
    +/-
    Volts
    </TD></TR></TBODY></TABLE>
    <TABLE cellSpacing=0 cellPadding=0 border=1><TBODY><TR><TD vAlign=top align=middle rowSpan=4>1948</TD><TD noWrap align=right>6,561</TD><TD noWrap>V8</TD><TD noWrap align=middle>48-60S</TD><TD noWrap align=middle>133</TD><TD noWrap align=middle>4356/4356</TD><TD noWrap align=middle>8.20x15</TD><TD noWrap align=middle>5 x 5</TD><TD noWrap align=middle>In Block</TD><TD noWrap align=middle>3 1/2 x 4 1/2</TD><TD noWrap align=middle>346</TD><TD noWrap align=middle>7.25</TD><TD noWrap align=middle>150 @ 3400</TD><TD noWrap align=middle>AC 48</TD><TD noWrap align=middle>.028</TD><TD noWrap align=middle>.015</TD><TD noWrap align=middle>18736542</TD><TD noWrap align=middle>IGA or IGN</TD><TD noWrap align=middle>-6</TD></TR><TR><TD noWrap align=right>8,603</TD><TD noWrap>V8</TD><TD noWrap align=middle>48-61</TD><TD noWrap align=middle>126</TD><TD noWrap align=middle>4068/4150</TD><TD noWrap align=middle>8.20x15</TD><TD noWrap align=middle>5 x 5</TD><TD noWrap align=middle>In Block</TD><TD noWrap align=middle>3 1/2 x 4 1/2</TD><TD noWrap align=middle>346</TD><TD noWrap align=middle>7.25</TD><TD noWrap align=middle>150 @ 3400</TD><TD noWrap align=middle>AC 48</TD><TD noWrap align=middle>.028</TD><TD noWrap align=middle>.015</TD><TD noWrap align=middle>18736542</TD><TD noWrap align=middle>IGA or IGN</TD><TD noWrap align=middle>-6</TD></TR><TR><TD noWrap align=right>34,213</TD><TD noWrap>V8</TD><TD noWrap align=middle>48-62</TD><TD noWrap align=middle>126</TD><TD noWrap align=middle>4125/4449</TD><TD noWrap align=middle>8.20x15</TD><TD noWrap align=middle>5 x 5</TD><TD noWrap align=middle>In Block</TD><TD noWrap align=middle>3 1/2 x 4 1/2</TD><TD noWrap align=middle>346</TD><TD noWrap align=middle>7.25</TD><TD noWrap align=middle>150 @ 3400</TD><TD noWrap align=middle>AC 48</TD><TD noWrap align=middle>.028</TD><TD noWrap align=middle>.015</TD><TD noWrap align=middle>18736542</TD><TD noWrap align=middle>IGA or IGN</TD><TD noWrap align=middle>-6</TD></TR><TR><TD noWrap align=right>1,262</TD><TD noWrap>V8</TD><TD noWrap align=middle>48-75</TD><TD noWrap align=middle>136</TD><TD noWrap align=middle>4780/4959</TD><TD noWrap align=middle>7.50x16</TD><TD noWrap align=middle>5 x 5</TD><TD noWrap align=middle>In Block</TD><TD noWrap align=middle>3 1/2 x 4 1/2</TD><TD noWrap align=middle>346</TD><TD noWrap align=middle>7.25</TD><TD noWrap align=middle>150 @ 3400</TD><TD noWrap align=middle>AC 48</TD><TD noWrap align=middle>.028</TD><TD noWrap align=middle>.015</TD><TD noWrap align=middle>18736542</TD><TD noWrap align=middle>IGA or IGN</TD><TD noWrap align=middle>-6</TD></TR></TBODY></TABLE>
     
  11. Ebbsspeed
    Joined: Nov 11, 2005
    Posts: 5,009

    Ebbsspeed
    ALLIANCE MEMBER

    Hard to tell if it's the engine or trans that is causing the issue, only way to tell for sure is separate them. How long had it been sitting, and in what conditions? If it's been sitting for a few years it's more than likely that the engine has a tight spot. Squirt a few ounces of your favorite rust buster down each spark plug hole, let it sit for a couple days, and see if it turns any easier.
     
  12. Good luck breaking it apart. I had a tight spot in my caddy 8 with a Hydro. You need to pull the what seemed like 60 bolts that hold the TQ together and if it is stuck , you may have to pull the crank attached to the tranny to unbolt it from the tranny. Unless you break some portholes into the bell housing to gain access.

    GOOD LUCK


    I got mine seperated after about three days of work. Ended up being a stuck valve that was locking it up. Tore into it, loosened up the valve. Now it rotates 360 with no problems after sitting 30 some years.
     
  13. 47fordcoe
    Joined: Dec 8, 2005
    Posts: 266

    47fordcoe
    Member
    from San Diego

    This kind of what I'm thinking it is.....what were the steps you did to fix the stuck valve...and on that note what was the torque on the head bolts and in what sequence...thanks for the help....Aaron
     
  14. 47fordcoe
    Joined: Dec 8, 2005
    Posts: 266

    47fordcoe
    Member
    from San Diego

    Thanks BULLSAC...I'm going to order a 48 shop manual!!!
     

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