PRODUCT DETAILS
Honda K20Z3 Serpentine Belt - 31110-RRB-A01
Your Civic Si's serpentine belt is squealing on startup or you've noticed cracks running across it? Part number 31110-RRB-A01 is the OEM serpentine belt for the K20Z3 engine in the 2006-2011 Civic Si. This belt drives everything off your crankshaft - the alternator, power steering pump, A/C compressor, and water pump. When it fails, you're losing all of those systems at once. The steering gets heavy, the battery stops charging, the A/C quits, and your engine overheats. Fresh belt keeps everything running and stops the squealing.
Here's What Happens When They Fail
Serpentine belts wear out from heat cycling, age, and constant flexing around all the pulleys. The rubber gets hard and develops cracks across the ribs. You'll see the cracks on the ribbed side of the belt if you look closely. Once it's cracked, it's living on borrowed time. The belt can also glaze over from slipping. The surface turns shiny and it won't grip the pulleys right anymore. When it slips, you're hearing that high-pitched squeal, especially on cold starts or when you turn the steering wheel hard. Eventually the belt breaks. When it snaps, everything stops working at once. No power steering, no charging, no A/C, and your engine starts overheating because the water pump's not spinning. You're pulling over immediately.
Don't Ignore the Squealing
People drive around with squealing belts for months thinking it's no big deal. Then the belt snaps on the highway and they're stuck on the side of the road overheating with no power steering. The belt's cheap and it takes twenty minutes to replace. When you hear squealing or you see cracks, replace it. Don't wait until it breaks. Check your belt every time you're under the hood. If it's cracked, frayed, or shiny from glazing, throw a new one on. The belt's doing critical work and when it fails, your car's done driving until you replace it.
OEM Belts Handle the Heat Better
You can find cheaper aftermarket serpentine belts all day long. Some work fine. Some are made from rubber that can't handle engine heat and they crack fast or stretch out. The OEM Honda belt's made from a compound that handles the heat cycling and constant flexing without falling apart. It lasts longer and it grips better. Yeah, it costs more than the cheap belt at the parts store. But you're not replacing it every year because the rubber gave up. OEM belts typically go 60k-80k miles if you don't run them too loose. Cheap belts might make it to 40k if you're lucky.
What You Get
- Honda OEM serpentine belt (part number 31110-RRB-A01)
- Drives alternator, power steering, A/C compressor, and water pump
- Multi-rib design for proper grip on all pulleys
- Same belt your Civic Si came with from the factory
Fits Your Car
- 2006-2011 Honda Civic Si (FA5/FG2)
Compatible Engine
- K20Z3 (2006-2011 Civic Si)
Note: The K20Z3 uses an automatic tensioner so you don't have to manually adjust belt tension. Just route the belt around all the pulleys following the belt routing diagram on the radiator support, use a breaker bar to release the tensioner, slip the belt on, and let the tensioner take up the slack. After you've installed the belt, start the engine and make sure it's running quiet. If you're still hearing squealing, the belt might not be seated properly on one of the pulleys. Shut it off and check that the belt's centered on each pulley. After a few hundred miles, check the belt for proper tracking. It should be running centered on all the pulleys without walking off to one side. If it's tracking off-center, one of your pulleys might be misaligned.