Steering Gearbox Rebuilders Manual Steering S76
Step 1S75 Fast Ratio Manual Steering S76 Luxury Steering Wheel S77 Power Steering S78 Full Horn. Consult your manual for procedures. The first thing you will need to do is remove your Corvette’s steering box from the frame mount. This job will take a couple of hours to complete and, of course, you’ll need to keep your basic tools handy. Follow along as I take an in-depth look on what it takes to restore your Corvette’s steering box to its original condition. Often the steering box lubricant NEVER gets changed – oil breakdown as well as water intrusion can cause a real mess inside permanently wearing the internal components.
Use a screwdriver to turn the lash-adjusting stud in order to back off the top cover of the Corvette steering box. Step 6: Remove four bolts holding the valve housing (on top of input shaft).01: Remove the three bolts that attach the top cover, then remove the lock nut from the lash adjusting screw. Step 5: Remove the Sector Shaft from the box. This will not work unless the box has been centered.
Rebuild your Steering Gear Box This includes tie rods, connecting arms, kingpins.03: Use a punch to remove the lock ring. Step 3Options: Extreme Detailing - 49 Extreme vs Standard detailing. Our coverage runs through 2017 including Power Steering, Rack & Pinion, Manual Gear Boxes, Magnasteer & EVO Rack & Pinions, EVO Power Steering Pumps, Electronically Powered Hydraulic Steering (EPHS), and Electronic Power Steering available 02: Once you have the cover off, you can use a brass punch and hammer to drive the Pitman shaft out of the box.
Step 505: Remove the worm gear assembly. As you can see, this box was in very bad shape. Step 404: You can now remove the worm gear cover.
Step 707: Using a large shaft, drive the Pitman arm shaft bushings out of the housing. Note that you drive the race out from the outside of the housing. Once you have removed the plug, you can drive the bearing race out of the housing.
You will need to reassemble this the same way. Note how the worm gear goes onto the worm gear shaft. Once the tubes are out, you can dump all the ball bearings out of the worm gear assembly. You can now clean these as well because you will be reusing them. Step 909: Now remove the metal tubes in the top of the worm gear and separate them. Step 808: Moving back to the worm gear assembly, remove the two screws that attach the retaining clip to the worm gear.
Step 1111: Place the worm gear shaft into the worm gear, making sure that you have the angle of the teeth the same way as when you took it apart. Then fully line the tubes with as many ball bearings that will fit, then place the other half of the tube on top of them. Place a thick coat of steering box grease (part# SC-601) into one side of each of the metal tubes. In Zip Corvette part# SC-638 ( 1963-1982 Corvette Steering Box Rebuild Kit), we received 54 ball bearings to go into the worm gear assembly. First, build the worm gear assembly. Step 1010: Now you can reassemble the steering box.
Step 1212: Moving to the box, use a race installer to install the new Pitman arm bushings into the box. Once you have installed all of the bearings, push the tubes into the worm gear and install the retaining strap. Use a small screwdriver to push them down into the worm gear.
Make sure you drive them in until they stop. Step 1313: Now you can install the worm gear bearing races and the retaining cover. To make them easier to install, try putting them in your freezer for about an hour. If you can’t remember, then the bushings need to be level with the edge of the box to allow room for the seal to be installed.
You will need to center the worm gear assembly now. Tighten the cover enough to remove the play out of the worm gear shaft. Place the second bearing on the worm gear shaft and install the cover. Then pack grease around the worm gear assembly in the housing. Install the worm gear assembly into the box, making sure that the bearing fully seats into the race. Step 1414: Apply a fair amount of grease onto the end of the worm gear shaft, then place the bearing on the shaft and grease the outside of the bearing.
The teeth on the Pitman arm shaft should mesh with the teeth on the worm gear. Use your finger to pull the worm gear up toward the top of the box, lightly coat the shaft with grease, and insert it into the box. Step 1515: Install the Pitman arm shaft. This will center the worm gear. Starting from the lock position, turn the shaft 1 3/4 to 2 turns.
You should have between 5- and 7-inch pounds of rolling torque for your preload. The preload is set by tightening the worm gear cover until you reach the desired settings. Use the screwdriver to reinstall the cover (don’t forget the gasket).16: Set the backlash and preload on the worm gear and Pitman shaft gear with an inch-pound torque wrench. Once the Pitman arm shaft is installed, you can install the lash-adjusting stud with the shim on it.
Once you have the correct settings, install the lock nut on the adjusting stud and reinstall the steering box in your Corvette. This means that as you rotate the box, it will take 7-inch pounds of torque until you start to get close to where the box is centered, then it should peak around 14-inch pounds and start to decrease as you turn the box past the center.
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