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Classic/Antique Car Repair/77 corvette
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Question
I AM LOOKING FOR THE TORQUE SPECKS FOR THE PINION NUT AND THE CARRER COVER FOR MY 77 VETTE. CAN ANYONE HELP ME WITH THIS? THANK YOU.
Ok Scott, lets give it a try, the pinion nut does not have a specific torque. It is a self locking nut and is tightened until the spacer, a crush spacer, between the front and rear pinion bearing crushes enough to give a specific preload on the bearing when turning the pinion without the ring gear in place. That specification is 20 to 25 inch pounds of torque. A note of caution here. If you have over tightened the pinion nut and it takes more than 525 inch pounds of torque to turn the pinion measured with an inch pound torque wrench, replace the crush spacer and start over again. If you are replacing the pinion seal without removing the differential and ring gear, my trick is to mark the position of the pinion nut when removing it with a center punch. Then tighten the nut back up on assembly until the marks you made line up. Chevrolet says that the carrier cover bolts should be tightened to 20 foot pounds. or 27 Newton Meters. Good luck.
Brad
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Answers by Expert:
Brad Sears
Expertise
All automotive including antique and collectible. However if the car has been modified I can only answer in general terms and maybe get you pointed in the right direction.
Experience
Automotive tech instructor.
Syndicated auto columnist 1970's though the early 1990's.
Syndicated auto radio talk show, Ask Brad About cars, CBS Radio 70's through 90's
TV Show "Last Chance Garage" 1980's PBS-TV syndicated.
Auto instructor for the following companies:
Fram
Autolyte
Holly
Carter
AMF
Ford Motor
University Of Conn
Blue Hills Technical School
Sugar River Technical Center
Grew up in a family garage in Needham Mass and turned wrenches from the age of 14.
Publications
Manchester Union Leader, Nashua Telegraph, Motor Service Magazine, Yankee Magazine, Popular Mechanics (Saturday Mechanic early 80's), Los Angeles Times, New York Times, and lots more.
Education/Credentials
More than I care to remember.
Basically Franklin Technical Institute in Boston, Northeastern University, Fitchburg State Teachers College, Tufts University, and a lot of factory schools along the way.
Awards and Honors
Moto Award winner. And much more.
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