What the Repair Takes
A torsion spring job on a 16-foot double built to this era's specs means matching the wire size and wind to what's actually on the shaft, not swapping in a generic spring off the shelf - a mismatched spring either won't lift the door or will overload the opener trying to compensate. We carry common sizes on the truck, but a less common wind or a discontinued track bracket for this door width can mean a return trip once the part is in hand. That's the honest limitation: we don't stock every spring size for every door width, and we'd rather tell you that up front than promise a same-visit fix we can't back.
Beyond the spring itself, the repair usually includes checking the cable drums and end bearings while the door is under control, since a spring failure on a door this size often takes a bearing or a section of cable with it. If the opener has been straining against a weak spring for a while - which happens more here given the daily heat swing - we check the gear and the drive before calling the job done, because an opener that's been fighting a bad spring for months doesn't always recover just because the spring is new.
The DIY Question
A torsion spring on a door this wide stores enough force to break a bone or worse if the winding bars slip, and a 16-foot double carries more spring tension than a single-car door of the same era. This isn't a project for a Saturday with a socket set. Cable replacement is close behind it on the danger list - a cable under load that snaps or slips off a drum can whip hard enough to do real damage.
What's reasonable to check yourself: the photo-eye sensors near the floor tracks, whether the track bolts have worked loose from heat expansion and contraction, and whether the rollers are cracked or worn flat on one side, which is common on doors that have logged a couple of decades of daily heat cycles. If the door won't open, won't stay open, or drops unevenly on one side, that's a spring or cable problem, and it's worth a call rather than a trip to the hardware store.











