An MGB's windshield should be maintained to ensure that it does not pick up any unwanted cracks or scratches. If your windshield does become damaged, you should replace it as soon as possible. When removing a windshield, you should have someone to assist with the windshield's removal and insertion. You can purchase a replacement windshield from your local auto parts store.
Place a sheet over the hood and dashboard of your vehicle to prevent any unwanted scratches to the car's finish while working on the windshield.
Remove the screws holding the rear-view wing mirrors in place, using a screwdriver. Slide the mirrors off, which will provide easier access to the windshield.
Cut away the rubber seal around the windshield, using a knife or other sharp-blade tool. Pull the seal away from the vehicle with your hand as you cut it. Discard the seal in the trash.
Enter the passenger compartment of your vehicle and carefully push the windshield out of its frame while the person assisting you holds its weight outside the car. Discard the windshield at a junkyard or recycling centre.
Apply a thin layer of petroleum jelly around the edges of the new windshield. Attach the new gasket, placing the heavy part of the gasket at the bottom. Tie a cord around the edges of the windshield and move it into place on the MGB
Hold the windshield down from the outside to allow the seal around the edges to set in place. Fix the cord to the inside of the vehicle for added support. Clean the windshield to remove any dirt or fingerprints. Thoroughly clean the dashboard to prevent any glass or debris getting in to the electrical components or vents.