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A little homework up front can save time later. We went to the library and copied exploded-parts diagrams for our interior panels and window mechanism from a repair manual.
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On this '66 Mustang convertible, we removed the rear seat and door-sill molding for easier access to the body panel. Begin removing the interior panel by unscrewing the window cranks, armrests and any other appendages.
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The service-manual diagrams provide clues on where to locate hard-to-find fasteners so that the panel can be removed elegantly.
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Carefully remove the watershield. If untorn, it can be reused.
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The problem can now be diagnosed. This top view through the window channel shows that both rollers (arrows) have jumped their tracks. The regulator functions properly. Otherwise, we'd unbolt it from the body and jockey the assembly through the lower hole to repair or replace it.
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Replacement rollers are usually dealership items or sourced through an aftermarket specialty business. (This new roller can from an early Mustang supplier.) Based on its damage, the old roller on the right apparently tore out of its track.
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Lack of lube is commonly the broken-roller perpetrator. To avoid having to redo the job in the foreseeable future, we cleaned all dirt and debris out of the window cavity and lubed all moving parts--including the new roller--with white lithium grease.
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The dirty work concludes by sliding the rollers into the tracks, cranking the regulator down, putting the arms' studs through the rollers, then sliding on the retaining clips. Interior panels reinstall in the reverse order of disassembly.
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