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C3 Mechanics Please Assist

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Old Dec 13, 2018 | 06:01 PM
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Default C3 Mechanics Please Assist

C3 Mechanics,

I need your professional input . What size socket is the exact fit needed to remove the three bolts holding the stock steel pad that holds the rear leaf spring to the aluminum bat wing on a 1980 Corvette ?

Thank you Forum members for being a great resource for all of us learning about these iconic cars.

Robert
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Old Dec 16, 2018 | 05:40 PM
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The three bolt heads are a M12 (metric) head bolt, the two larger ones are m12x 1.75 x 90 and the smaller one is m12 x 1.75 x 30.

They torqued... with the car sitting on the ground at 55-75 ft pounds. Never... Ever torque the spring with the wheels off the ground. You can snug the bolts but torque it with the car under full load.

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Last edited by Willcox Corvette; Dec 16, 2018 at 05:41 PM.
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Old Dec 16, 2018 | 07:17 PM
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Hi. Bolt heads or threads? GM used 18mm heads on some larger bolts. So if 3/4 and 19 are loose and 17 and 11/16 too small. That will be the culprit...
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Old Dec 16, 2018 | 10:52 PM
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Originally Posted by derekderek
Hi. Bolt heads or threads? GM used 18mm heads on some larger bolts. So if 3/4 and 19 are loose and 17 and 11/16 too small. That will be the culprit...
I think he means heads, Which are 18mm on these bolts.
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