PRODUCT DETAILS
Gates Micro-V Serpentine Belt - 2006-2011 Honda Civic Si (K20Z3)
One belt does a lot of work on your 8th gen Si. That single serpentine belt spins your alternator, power steering pump, and A/C compressor off the K20Z3, so when it wears out and lets go, you don't lose just one thing, you get charging problems, a steering wheel that suddenly feels like a workout, and dead A/C all at the same time. It's a wear item, plain and simple, and on an FA5 or FG2 that's been around the block a few times, it's worth staying ahead of. This is the Gates K070649, an OEM-spec Micro-V replacement that matches Honda part 31110-RRB-A01, so you can swap it before it strands you instead of after.
Why You Want The Gates One
Quick reason this is the belt to grab: Gates actually supplies belts to Honda from the factory, so you're not gambling on a generic aftermarket guess, you're getting what Honda would've put on the car. The K070649's a 7-rib Micro-V, 65-9/16" outside length with a 1" top width, built from EPDM rubber on an aramid fiber cord, and here's a fun fact, aramid is the same fiber they use in ballistic vests, so stretch isn't an issue. That EPDM also takes the heat around the K20Z3 way better than the old neoprene belts ever could, which is exactly what you want from a belt baking in a hot engine bay for years. Gates rates it to meet or beat SAE J1459, J2432, and J1596, so it's not cutting corners to land a cheaper price.
Here's How You Actually Know It's Worn
Pay attention here, because these belts will fool you. Honda doesn't give a hard replacement interval for the 8th gen Si, but most techs say inspect it around 60,000 miles and replace it by 100,000, or whenever the wear shows up. The catch is that modern EPDM belts don't crack and fray the way the old neoprene belts did, they just quietly wear the ribs down thinner over time while the belt looks fine from the top. So you can't just eyeball it. Grab a belt wear gauge (cheap, every parts store has one) and check the rib depth, and if it's worn to the indicator marks, replace it no matter how good it looks.
While You're In There, Check What Spins It
Do yourself a favor and don't just throw the new belt on and walk away. Spin your idler pulley and your tensioner pulley by hand and feel for any roughness, grinding, or play. A failing idler or tensioner will chew through a brand-new belt fast, so if either one feels off, that's your sign. Knocking all three out at once is cheap insurance against pulling this job apart twice, which nobody wants to do.
Putting It On
Install's pretty quick if you've done one before. Find the routing diagram on the sticker under your hood, release the automatic tensioner, slip the old belt off, route the new one exactly like the diagram shows, and let the tensioner back down onto it. The 8th gen Si runs an automatic tensioner, so there's no manual tension to set, it does that for you. Just make sure your tensioner's actually holding proper tension while you're in there, and if it isn't, replace it.
Make Sure It's The Right Belt
Read this before you order, because the Civic uses more than one belt. This one fits the 2.0L K20Z3 in the Si, that engine specifically. If you've got a base Civic with the 1.8L R18, this is not your belt, the R18 uses a different length and rib count entirely. So confirm you've got the Si with the K20Z3 before you buy.
Specs
- Part number: Gates K070649
- Type: Micro-V serpentine drive belt
- Rib count: 7
- Outside length: 65-9/16" (1666mm)
- Top width: 1" (25mm)
- Belt material: EPDM
- Cord material: aramid fiber
- Standards: meets or exceeds SAE J1459, J2432, J1596
- OEM cross-reference: Honda 31110-RRB-A01
Fits These Cars
- 2006-2011 Honda Civic Si (FA5/FG2), K20Z3 2.0L DOHC i-VTEC
- 2007-2010 Acura CSX (Canadian market), K20Z3 2.0L DOHC i-VTEC
Note: Gates K070649 Micro-V serpentine drive belt for the 2.0L K20Z3 in the 2006-2011 Honda Civic Si (FA5/FG2) and the 2007-2010 Acura CSX (Canadian market). A 7-rib belt at 65-9/16" (1666mm) outside length with a 1" (25mm) top width, made from EPDM rubber with an aramid fiber cord for low stretch and high heat resistance, and rated to meet or exceed SAE J1459, J2432, and J1596. Cross-references Honda part number 31110-RRB-A01. This belt fits the 2.0L K20Z3 only; a base Civic with the 1.8L R18 uses a different belt (different length and rib count), so confirm you have the Si before ordering. Inspect the idler and tensioner pulleys when replacing the belt and replace a tensioner that isn't holding proper tension. One belt per order.