Manual transmission output seals and drive axle seals are critical components that prevent transmission fluid leaks where the drive axles connect to the transmission. Over time, these seals can harden, crack, or wear, leading to fluid loss and potential transmission damage. This guide outlines the general procedure for replacing these seals on applicable Honda and Acura models.

This procedure is generally applicable to Honda and Acura vehicles equipped with manual transmissions, including models such as the Accord, Civic, CRX, Del Sol, Integra, and Prelude. Specific steps and torque values may vary by model and year; always consult the factory service manual for your particular vehicle.

Tools and Materials#

To perform this service, gather the following:

• New transmission output seals: Ensure correct left and right seals for your specific transmission.
• New drive axle nut(s): These are typically single-use and should always be replaced.
• Fresh Honda Genuine Manual Transmission Fluid (MTF) or equivalent.
• Socket set and wrenches: Including a large socket for the axle nut (e.g., 32mm or 36mm, confirm with FSM).
• Torque wrench: Capable of measuring high torque values for the axle nut.
• Breaker bar.
• Pry bar or large screwdriver.
• Seal puller tool.
• Seal driver tool or appropriate-sized socket/pipe.
• Jack and jack stands.
• Wheel chocks.
• Drain pan.
• Shop rags and cleaning solvent.
• Gloves and eye protection.
• Cotter pins (if applicable for lower ball joint/tie rod).
• New lower ball joint pinch bolt (if applicable, often recommended).

Procedure#

1. Vehicle Preparation#

1. Secure the Vehicle: Park the vehicle on a level, firm surface. Engage the parking brake and place wheel chocks behind the rear wheels.
2. Loosen Axle Nut: With the vehicle on the ground, use a breaker bar and the appropriate socket to loosen the drive axle nut. Do not remove it completely at this stage.
3. Lift and Support: Safely raise the front of the vehicle using a jack and support it securely on jack stands.
4. Remove Wheels: Remove the front wheels.
5. Drain Transmission Fluid: Place a drain pan under the transmission. Remove the transmission drain plug and allow the fluid to drain completely. Reinstall the drain plug with a new crush washer and tighten to the factory specified torque.

Important

Always use new crush washers for drain and fill plugs to prevent leaks. Consult the factory service manual for drain plug torque specifications.

2. Drive Axle Removal#

1. Disconnect Suspension Components:

• Remove the cotter pin and castle nut from the lower ball joint.
• Separate the lower ball joint from the lower control arm using a ball joint separator tool or by carefully prying down on the lower control arm while pushing the knuckle outwards.
• Alternatively, the tie rod end or compliance bushing bolts may need to be disconnected, depending on the specific vehicle and space constraints. Consult the FSM for the recommended method.

2. Separate Axle from Hub: Push the wheel hub assembly outwards to free the drive axle shaft from the hub.
3. Remove Axle from Transmission:

• For axles without an intermediate shaft, carefully pry the inner CV joint out of the transmission case using a pry bar. Be gentle to avoid damaging the transmission case or differential.
• For axles with an intermediate shaft, the axle will slide out of the intermediate shaft. The intermediate shaft itself is typically bolted to the engine block and has its own seal at the transmission. If replacing the intermediate shaft seal, the shaft must also be removed.

Caution

When prying the axle from the transmission, ensure the pry bar is placed against the inner CV joint housing and not against the transmission case or seal surface. Excessive force or improper leverage can damage the transmission.

3. Seal Replacement#

1. Remove Old Seal: Use a seal puller or a flat-blade screwdriver to carefully pry out the old transmission output seal. Work slowly and avoid scratching the transmission case or the differential bearing surface.
2. Clean Sealing Surface: Thoroughly clean the seal bore in the transmission case, removing any old fluid, dirt, or debris. Inspect the sealing surface for any nicks or corrosion that could compromise the new seal.
3. Install New Seal:

• Apply a thin coat of clean transmission fluid to the lip of the new seal.
• Position the new seal squarely in the bore.
• Using a seal driver tool, or a socket/pipe of appropriate diameter that contacts the outer edge of the seal, gently and evenly tap the seal into place until it is flush with the transmission case. Ensure it is not cocked or damaged during installation.

Tip

Some seals have a specific orientation (e.g., a spring-loaded lip facing inwards). Always confirm the correct installation direction with the factory service manual.

4. Drive Axle Reinstallation#

1. Lubricate and Install Axle: Apply a thin coat of clean transmission fluid to the splines of the drive axle. Carefully guide the inner CV joint into the transmission, ensuring the splines align. Push firmly until the axle seats fully into the differential. You may feel a "click" as the retaining clip engages.
2. Reconnect Suspension Components:

• Guide the outer CV joint splines through the wheel hub.
• Reconnect the lower ball joint to the lower control arm. Install the castle nut and a new cotter pin. Tighten the ball joint nut to the specified torque.
• Reinstall any other disconnected suspension components (e.g., tie rod end, compliance bushing bolts) and tighten to their respective torque specifications.

3. Install New Axle Nut: Install a new drive axle nut and hand-tighten it.
4. Lower Vehicle (Partially): Lower the vehicle until the wheels just touch the ground, allowing the axle nut to be tightened without the wheel spinning.
5. Torque Axle Nut: Tighten the drive axle nut to the factory specified torque value. This is a critical step for hub and bearing longevity.

Important

The drive axle nut is a critical fastener. Always use a new nut and tighten it to the exact torque specified in your factory service manual. Over- or under-tightening can lead to premature bearing failure.

5. Fluid Refill and Final Checks#

1. Refill Transmission Fluid: Remove the transmission fill plug. Using a funnel and hose, slowly add the specified amount of Honda Genuine MTF or equivalent fluid. The fluid level should be at the bottom edge of the fill hole when the vehicle is level. Reinstall the fill plug with a new crush washer and tighten to the factory specified torque.

Note

Consult the factory service manual for the correct type and capacity of transmission fluid for your specific model.

2. Reinstall Wheels: Reinstall the front wheels and tighten lug nuts to the factory specified torque.
3. Final Inspection:

• Lower the vehicle completely.
• Inspect for any tools left under the vehicle.
• Check all connections and fasteners for proper tightening.
• Look for any immediate leaks around the new seals.

4. Test Drive: Take the vehicle for a short test drive, paying attention to any unusual noises or handling characteristics. After the test drive, re-check for leaks.

Warning

If any unusual noises or handling issues are present, immediately pull over and inspect the vehicle. Do not continue driving until the issue is resolved.

This procedure provides a general guideline. Always refer to the official Honda or Acura factory service manual for your specific vehicle for detailed instructions, precise torque specifications, and any model-specific variations.