Honda K Series Mainshaft Brake Return Spring 24413-PNS-000

Honda K Series Mainshaft Brake Return Spring - 24413-PNS-000

Rebuilding your K series 6-speed transmission and you need the mainshaft brake return spring? Part number 24413-PNS-000. This is the small spring that sits between the gear selector arm and the mainshaft brake arm. When you shift into reverse, the selector arm pushes the mainshaft brake to stop the mainshaft from spinning. When you shift out of reverse, this spring pulls the brake arm back to its rest position. Without this spring or if it's weak or broken, the mainshaft brake doesn't return properly. You're getting grinding going into reverse or the brake's staying engaged when you shift out of reverse. Fresh spring keeps the mainshaft brake working right.

Here's What This Spring Does

The mainshaft brake stops your mainshaft from spinning when you're shifting into reverse. The brake arm engages and clamps the mainshaft so reverse gear can mesh without grinding. When you shift out of reverse, the brake arm needs to release and return to its neutral position. This return spring pulls the brake arm back. Without the spring, the brake arm just sits there wherever it was. It might not fully disengage. You're getting drag on the mainshaft or the brake's partially engaged in other gears. The spring's small but it's critical for the mainshaft brake to cycle properly.

Replace It During Transmission Rebuilds

If you're tearing your K series 6-speed apart for a rebuild, replace this spring. It's inside your transmission on the selector mechanism. The spring's cheap and it's right there when you've got the selector assembly out. Don't reuse a spring that's been cycling thousands of times for 100k+ miles. Springs lose tension over time. A weak spring means the brake arm doesn't return all the way and you're getting shifting problems. If you're replacing the mainshaft brake arm, 24412-PNS-000, replace this return spring at the same time. They work together and you're already in there.

Tiny Spring, Important Job

This spring's tiny. Most people rebuilding transmissions don't even notice it until they're looking at parts diagrams or the old spring falls out. But when it's missing or weak, your reverse shifts are grinding or you're getting weird drag in other gears because the brake's not fully releasing. It's one of those parts that seems like nothing until it's not there and your transmission's acting up. Replace it during your rebuild and you won't think about it again.

What You Get

• Honda OEM mainshaft brake return spring (part number 24413-PNS-000)
• Returns mainshaft brake arm to neutral position
• Sits between gear selector arm and mainshaft brake arm
• Ensures proper mainshaft brake cycling
• Prevents brake drag and grinding shifts
• Same spring your transmission came with from the factory

Fits Your Car

• 2002-2006 Acura RSX Type S
• 2004-2012 Acura TSX
• 2006-2011 Honda Civic Si

Compatible Transmissions

• K20A2 6-speed (2002-2004 RSX Type S)
• K20Z1 6-speed (2005-2006 RSX Type S)
• K20Z3 6-speed (2006-2011 Civic Si)
• K24A2 6-speed (2004-2008 TSX)
• K24Z3 6-speed (2009-2012 TSX)

Note: This spring's inside your transmission on the selector mechanism. You need to pull the selector assembly out to replace it. If you're doing a transmission rebuild, this spring should be on your parts list along with the mainshaft brake arm. When you're installing it, make sure it hooks between the selector arm and the brake arm properly. The spring needs tension to pull the brake arm back. If it's not hooked right, it won't return the brake arm and you'll have shifting problems. Check that the spring's seated correctly before you button everything up. If you're replacing the mainshaft brake arm because it's worn or damaged, don't reuse the old spring. Replace them together. The spring's cheap and it's critical for the brake mechanism to work right.