Honda B/F/H Series Input Shaft Seal 91216-PH8-005

Honda B/F/H Series Input Shaft Seal - 91216-PH8-005

Your transmission's leaking fluid from the bellhousing area or you're rebuilding your B, F, or H series trans? This is the OEM input shaft seal that stops fluid from leaking past the input shaft bearing. Part number 91216-PH8-005. It sits inside the transmission case in front of the input shaft ball bearing. When this seal fails, you're leaking transmission fluid into the bellhousing. It drips down onto your starter, mixes with clutch dust, and makes a mess. Eventually you're low on fluid and you're wearing out your trans internals. Fresh seal keeps your gear oil sealed inside the transmission where it belongs.

Here's Why This Seal Fails

The input shaft seal's inside your transmission spinning with the input shaft every time you're driving. After 150k+ miles or 20+ years, the rubber hardens from heat cycling and the seal lip wears down from constant contact with the rotating shaft. Once it starts leaking, it's not going to stop. You'll see fluid weeping around the input shaft area inside the bellhousing. If you ignore it, you're losing fluid slowly until your transmission's running low and your synchros and bearings are getting starved. The seal's cheap. Replacing it after you've already dropped the transmission and split the case is easy. Replacing it after you've reassembled everything and realized you're still leaking is a nightmare.

Replace It During Transmission Rebuilds

If you're splitting your transmission case for a rebuild, replace this seal. You're already in there. The seal's right in front of you when the case is open. Don't reuse a 20-year-old seal that's been heat-cycled 150,000 times and expect it to hold. Fresh seal costs a couple bucks and you know it's not leaking. If you're just doing a clutch job and you're not opening the transmission, you're not touching this seal. But if you're rebuilding internals or replacing the input shaft bearing, replace the seal at the same time. Don't skip a $15 seal on a transmission rebuild that's already costing you hundreds in parts and labor.

Installs Inside the Transmission Case

This seal sits inside the transmission case in front of the input shaft ball bearing. You're not getting to it without splitting the transmission case. It's not the same as the axle seals that you can replace from outside the trans. This one's internal. When you're rebuilding your transmission, the seal presses into the case bore and seals against the input shaft. Make sure the seal's pressed in square and seated fully. If it's crooked or not seated all the way, it'll leak.

What You Get

• Honda OEM input shaft seal (part number 91216-PH8-005)
• 28mm x 41mm x 7mm dimensions
• Seals input shaft at ball bearing location
• Prevents transmission fluid leaks into bellhousing
• Installs inside transmission case (requires case split)
• Same seal your transmission came with from the factory

Fits Your Car

• 1997-1999 Acura CL
• 1990-2001 Acura Integra
• 1992-1994 Acura Vigor
• 1990-2002 Honda Accord (4-cylinder)
• 1999-2000 Honda Civic Si
• 1998-2001 Honda CR-V
• 1994-1997 Honda Del Sol VTEC
• 1988-2001 Honda Prelude

Compatible Transmissions

• B Series (B16, B17, B18 - Integra, Civic Si, Del Sol VTEC)
• F Series (F22, F23 - Accord, Prelude)
• H Series (H22, H23 - Prelude)

Note: This seal's internal. You need to split your transmission case to replace it. If you're doing a clutch job and you're not opening the trans, you're not replacing this seal. If you're rebuilding your transmission, replace it. When you're installing the seal, press it in using a seal driver or a socket that matches the outer diameter. Press it in square so it doesn't cock sideways. Make sure it's seated fully in the bore. The seal lip faces inward toward the transmission fluid. If you install it backwards, it'll leak immediately. Check your input shaft surface where the seal rides. If there's a groove worn into the shaft from the old seal, the new seal won't seal properly. You'll need to replace the input shaft or use a slightly larger seal. The seal's designed to seal against a smooth shaft surface, not a grooved one. If you're replacing the input shaft bearing, this is the perfect time to replace the seal since you're already at the input shaft assembly.