New rebuild: Can't turn crank by hand

Discussion in 'Small Block Tech' started by racerxjj67, Jul 19, 2018.

  1. racerxjj67

    racerxjj67 Well-Known Member

    Cranked would turn easily by hand, then attached block to torque converter/transmission and installed in car. Can't get it to turn now. What could be the problem? Any solutions or reasons why? Does the trans need to put into neutral or something? Help!

    Jeff
     
    OHC JOE likes this.
  2. OHC JOE

    OHC JOE Mullet Mafia since 2020

    Was it a complete rebuild of the engine..
     
  3. alec296

    alec296 i need another buick

    Maybe convertor wasn’t bottomed in pump properly . Loosen trans bell housing bolts . See if engine spins.
     
  4. racerxjj67

    racerxjj67 Well-Known Member

    Yes it turned fine before it was torqued to bellhousing
     
  5. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    Then unbolt the transmission, remove and reinstall the torque converter. Start by lining up the notches in the converter hub with the front pump tabs. Then spin and push on the converter until it drops back twice.

    From the TCI website FAQ,

    Is there an ideal way to measure the converter and transmission outside the car to make sure you should have the proper clearance between the converter and the flex plate before installation?

    Answer: Yes, you can use a straight edge, laying it across the face of the bell housing. (Engine side) Then with the converter installed in transmission, take a ruler and measure the distance from the straight edge down to the mounting pad of the converter. The measurement should be as follows:

    GM 4L60E 1 1/8" from Bellhousing to Pads
    GM 4L80E 1 1/8" from Bellhousing to Pads
    GM TH350 1 1/8" from Bellhousing to Pads
    GM TH400 1 3/16" from Bellhousing to Pads
    GM Powerglide 1 1/8" from Bellhousing to Pads
    Ford C6 1 1/8" from Bellhousing to Pads
    Ford C4 1 1/8" from Bellhousing to Pads
    Ford AOD/AODE 1 1/8" from Bellhousing to Pads
    Chrysler Torqueflite 727 1 1/4" from Bellhousing to Ring Gears (Not Pads)
    Note: Distance may vary +/- .050"
     
    Donuts & Peelouts likes this.
  6. Fox's Den

    Fox's Den 355Xrs

    Torque convertor was probably not in the trans all the way. You may have to unbolt the trans from engine to make sure the TQ con. is in all the way.
     
    Donuts & Peelouts likes this.
  7. Buick#455

    Buick#455 Well-Known Member

    It’s the converter, not seated properly. Larry & Guy hit the nail right on the head for ya. Easy fix. Post some results when up & running!
     
    Donuts & Peelouts likes this.

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