Honda K20A3 Flywheel Inspection Cover 21351-PNA-000

Honda K20A3 Flywheel Inspection Cover - 21351-PNA-000

Done with your clutch job or K swap and ended up with one of these sitting on the workbench? That's a problem. This is the genuine Honda OEM flywheel inspection cover for K20A3 engines with steel oil pans - part number 21351-PNA-000. It bolts between your oil pan and transmission to seal off the lower bellhousing area and block road debris, dirt, and moisture from getting to your flywheel and clutch. It's a small part, but skipping it means your clutch and flywheel are eating whatever comes up from the road.

Why This Cover Ends Up Missing

This cover comes off during clutch jobs, transmission swaps, and K swaps and doesn't always make it back on. It's one of the easiest parts to set aside and forget in the middle of a build. But without it, your flywheel and lower bellhousing are fully exposed to road grime and debris. If you're building a clean K swap or just putting your car back together the right way, this cover finishes the job.

K20A3 with Steel Oil Pan - Make Sure You Have the Right Cover

This cover is specific to K20A3 engines, which run a steel oil pan from the factory. That's the RSX Base and EP3 Civic Si. If you're running a different K-series with an aluminum oil pan - K20A2, K20Z1, K20Z3, or a K24 - you need honda lower transmission flywheel inspection cover rsx civic crv accord 21350 prb 000 (part number 21350-PRB-000) instead. Check your engine code before you order. Getting this wrong is an easy mistake to make, especially on swapped cars.

What's Included

• Honda K20A3 flywheel inspection cover
• Part number: 21351-PNA-000
• Genuine Honda OEM replacement
• For K20A3 engines with steel oil pans
• Bolts between oil pan and transmission

Fits

• 2002-2006 Acura RSX Base (Auto & Manual)
• 2002-2005 Honda Civic Si EP3

Compatible Engines

• K20A3 (RSX Base, Civic Si EP3 - steel oil pan only)

Note: This cover is for K20A3 engines with steel oil pans only. Running a K20A2, K20Z1, K20Z3, or K24 with an aluminum oil pan? You need part number 21350-PRB-000 instead. Some applications may not use every bolt hole depending on your chassis, but fitment and coverage are correct for all K20A3 applications. Don't leave this off the car.

Complete Your Clutch or K Swap Build

While you're in there, make sure the rest of your drivetrain is sorted. Check out our K-series clutch options including the Competition Clutch Stage 1 Gravity Clutch for K20A3/A4 for a street-friendly upgrade on K20A3 builds, or the Competition Clutch Stage 4 Ceramic Sprung Clutch for K20A/Z if you're pushing more power. If you want to drop rotating mass while you have the transmission out, the Competition Clutch Ultra-Light Flywheel for K20A2/A3/Z1/Z3 and Competition Clutch Light Steel Flywheel for K20A2/A3/Z1/Z3 are both worth a look.