Crankshaft Endplay?
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Crankshaft Endplay?

  1. #1
    Senior Member XClutchboy725's Avatar
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    Default Crankshaft Endplay?

    I bought a 540 Dart shortblock and today I have been disassebling and double checking everything.

    It's a good thing I did, but before I bag on anyone, I'm going to give him the opportunity to make it right.

    I have a question about crankshaft endplay...

    All I've read says BBC needs .006-.010

    I have maybe .001 !! Do they make bearings with say .005 smaller shoulder or what do I do?

    Jeff

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    Use some 600 grit paper on a piece of glass. Use WD 40 and wet sand the sides of the thrust bearing until you get your clearance. I set my 598" NA BBC at .007.

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    Senior Member XClutchboy725's Avatar
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    How do you make sure you are doing both halves evenly? Did you zip tie them together or something?

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    Senior Member XClutchboy725's Avatar
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    Did I mention that I love this place?.....

    Hotboat sucks!

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    steelcomp was here
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    Default Hold On There...

    Before you start sanding on anything, loosen the rear main and move the crank front to rear and see what you get. Make sure the rear cap and block aren't shifted slightly taking up that few extra thou you need. Tighten one of the other main caps to pry against and use a small prybar or screwdriver and move the crank fore and aft with some reasonable force. Once you've done this, then tighten the rear main and re-check. It's uncomon to have so little thrust clearance.
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    Senior Member ol guy's Avatar
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    Quote Originally Posted by steelcomp View Post
    Before you start sanding on anything, loosen the rear main and move the crank front to rear and see what you get. Make sure the rear cap and block aren't shifted slightly taking up that few extra thou you need. Tighten one of the other main caps to pry against and use a small prybar or screwdriver and move the crank fore and aft with some reasonable force. Once you've done this, then tighten the rear main and re-check. It's uncomon to have so little thrust clearance.
    Steel comp is right. Take the rear main upper off (rearmain cap ) and try again. Core shift and other things will make this happen.Also I would spin the crank with the rear saddle off and see if it is smooth. Retorque and try again. Don't go setting clearances on a one shot attempt. IMO M

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    Senior Member XClutchboy725's Avatar
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    Alright - I loosened the rear main cap and then gently wedged a screwsriver so that I was holding the crank forward and re-torqued the rear main.

    Now I can get about .0045 by using reasonable force with a screwdriver.

    Still too tight?

  10. #8
    steelcomp was here
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    .0045 is on the tight side, but I think it's OK. I usually shoot for .0050 min, but I've heard others say less.
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    Senior Member XClutchboy725's Avatar
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    I just spun the crank around and it takes much less force to rotate it now. You guys were right about core shift on the main cap.

    After spinning it around a bit I can get .006 out of it now.

    I think I'm good....

    Thanks guys!

  12. #10
    Senior Member ol guy's Avatar
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    Quote Originally Posted by XClutchboy725 View Post
    I just spun the crank around and it takes much less force to rotate it now. You guys were right about core shift on the main cap.

    After spinning it around a bit I can get .006 out of it now.

    I think I'm good....

    Thanks guys!
    Hey clutch, Retorque and try again. IMO M

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    Senior Member VAMI's Avatar
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    FYI thrust bearings are only made thicker in case of a burned up crank.,A crank grinder will weld it back up and fit it to that bearing.

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    Senior Member wagspe208's Avatar
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    Dart blocks have no locating pins, etc for the rear cap. So...the rear cap could go on anywhere back and forth wise. The guys have you on the right track, prying forward on the crank, then tightening/ torquing the rear main.
    Wags

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    Quote Originally Posted by XClutchboy725 View Post
    I just spun the crank around and it takes much less force to rotate it now. You guys were right about core shift on the main cap.

    After spinning it around a bit I can get .006 out of it now.

    I think I'm good....

    Thanks guys!
    I'm sure you could have got the same info on Hot Boat

    Sleeper CP

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    I've always done it by snugging the rear main, tapping the crank from the rear, then from the front and then torque the main. Always worked for me.

    Tim

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