Honda K Series Timing Chain Drive Gear 13620-RAA-A02

Honda K Series Timing Chain Drive Gear - 13620-RAA-A02

Doing a timing chain replacement on your K series and you need the crank drive gear? Honda part number 13620-RAA-A02 is the OEM timing chain drive gear that mounts on your crankshaft behind the crank pulley. This is the toothed gear that drives your timing chain. When you're pulling your timing chain cover for a chain replacement or front main seal job, you're removing this gear. Most people reuse the old gear if it's not worn, but if you're rebuilding a high-mileage motor or you've got a stretched chain that wore the teeth, you need a fresh gear. The OEM gear's machined to exact tolerances so your timing chain tension's correct and you don't get timing slip.

Here's Where This Gear Goes

The timing chain drive gear bolts to your crankshaft behind the crank pulley and crank position sensor trigger wheel (pulse plate). You're pulling your crank pulley off, removing the pulse plate, and then you'll see the timing chain drive gear. The gear's got internal splines that mate with the crankshaft snout. Three bolts hold it to the crank. The timing chain wraps around this gear on the bottom and goes up to your cam gears on top. When your crank spins, this gear drives the timing chain and rotates your camshafts at half crank speed. If the gear's worn or the teeth are damaged, your timing chain can skip and your valves hit your pistons. That's why you replace it if it's worn.

When You Actually Need to Replace This Gear

Most K series timing chain jobs don't require replacing the drive gear. If your chain's got normal wear and the gear teeth look good with no pitting or wear, you're reusing the old gear. But if you're rebuilding a motor with 200k+ miles, if your timing chain was really stretched and slapping around, or if you see visible wear on the gear teeth, replace it. Worn teeth mean the chain doesn't sit in the valleys properly and you can get timing slip. You'll also replace this gear if you're doing a K series build and you're upgrading to an aftermarket timing chain setup. Some race builds use different gear ratios or aftermarket chains that require a different drive gear.

Installation Requires Timing Chain Cover Removal

You can't get to this gear without pulling your timing chain cover off. You're removing the crank pulley, valve cover, cam gears, timing chain guide, tensioner, and timing chain cover. Once the cover's off, you unbolt the drive gear from the crank. Installation's the reverse - bolt the new gear to the crank with new bolts (or Loctite the old ones if they're in good shape), install your timing chain, set your cam timing, and button everything back up. If you're doing this job, you're already deep into the motor. Don't cheap out on the drive gear if it's worn. A $50 gear's way cheaper than rebuilding a motor after the chain skips and you bend all your valves.

What You Get

• Honda OEM timing chain drive gear (part number 13620-RAA-A02)
• Mounts on crankshaft behind crank pulley and pulse plate
• Drives timing chain from crankshaft to camshaft gears
• Precision-machined gear teeth for proper chain engagement
• Direct replacement for factory timing chain drive gear
• Same part your engine came with from the factory

Fits Your Car

• 2013-2015 Acura ILX
• 2007-2012 Acura RDX
• 2002-2006 Acura RSX
• 2004-2014 Acura TSX
• 2003-2012 Honda Accord (K24)
• 2002-2005 Honda Civic Si
• 2006-2011 Honda Civic Si
• 2012-2015 Honda Civic Si
• 2002-2014 Honda CR-V
• 2010-2015 Honda Crosstour (K24)
• 2003-2011 Honda Element

Compatible Engines

• K20A2, K20A3, K20Z1, K20Z3
• K23A1
• K24A1, K24A2, K24A4, K24A8
• K24Z1, K24Z2, K24Z3, K24Z7