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Bearing "tang"

Discussion in 'The Garage' started by RustBuket, Mar 10, 2003.

  1. RustBuket

    RustBuket 1/2 ton status

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    Bearing \"tang\"

    I'm in the process of rebuilding a 305 and noticed that the small groove in the main bearing cap does not match up with the groove in the block. Is this a problem? All the other caps match up. I have not yet installed the bearings yet. Do only the bearing grooves have to match up? Plz help me! /forums/images/graemlins/1zhelp.gif
     
  2. ben427

    ben427 1/2 ton status

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    Re: Bearing \"tang\"

    They are not supposed to match up. If they did match up you would run the risk of spinning a bearing. The tang is supposed to be in the groove and against the block to hold it from turning.
     
  3. RustBuket

    RustBuket 1/2 ton status

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    Re: Bearing \"tang\"

    Thanks man! I didn't know that, I thought it was something to do with lube. I owe ya one.
     
  4. ben427

    ben427 1/2 ton status

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    Re: Bearing \"tang\"

    No problem /forums/images/graemlins/thumb.gif
     
  5. 4DiggerDan

    4DiggerDan 1/2 ton status

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    Re: Bearing \"tang\"

    The tang DOES NOTHING but index the bearing during assembly! The diamter of the main is what keeps in from spinning. There is a slight crush fit once you torque the main down that keeps the bearing in there. The other thing that tang does is fold into the bearing if you spin one, making it so much easier to find a spun main. Same story with rods...

    If you press your main in and make it flush to one side, you'll be able to see that it just barely sticks up on the other side (we're talking less than .001" here, on the average.)

    Just for giggles, since you're assembling an engine, go to your local parts store and buy some Plasti-gauge. Read the instructions on the package and follow them. Cheap insurance... Even professionals use it, trust me...
     
  6. ben427

    ben427 1/2 ton status

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    Re: Bearing \"tang\"

    Yeah I know that but i find its much easier to get someone to understand the tang by saying it the way i did. Yeah plastigage is a very important step to do. Nothing like finding out the lack of clearance when she seizes up /forums/images/graemlins/thumb.gif
     
  7. RustBuket

    RustBuket 1/2 ton status

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    Re: Bearing \"tang\"

    Its a reconditioned crank. I think I should be good. I had the pistons and rods measured, they are to tolerance as well.
     
  8. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Re: Bearing \"tang\"

    CHECK IT ANYWAY! DON'T TRUST SOMEONE ELSE'S MEASUREMENTS UNLESS THEY'RE GOING TO PAY FOR IT WHEN IT BLOWS UP.
     
  9. m j

    m j 1/2 ton status

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    Re: Bearing \"tang\"

    un be lieve able /forums/images/graemlins/grin.gif

    I hope the capitals work where reason failed
     

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