clutches

Clutch Disassembly and Assembly Process

Removal of Components

  • Acknowledgment of a crucial step at the station area: the removal of a big snap ring.

    • Frictions and steels come off during this process.

  • Additional components to be removed:

    • Piston

    • Return spring

    • Other miscellaneous parts.

Use of Clutch Compressor

  • Importance of a clutch compressor to aid in the disassembly process.

    • A description of one style that mounts in a vise.

    • Mention of different styles available for students to work with.

    • Rationing style compressors: highlighted as being convenient, especially for the upcoming lab session.

Compressing the Clutch

  • The objective is to compress the spring just enough to relieve tension on the snap ring.

    • Importance of properly compressing the spring to avoid damaging the housing when removing the snap ring.

    • Aluminum components should be handled cautiously since they can break easily (although aluminum isn't present in this particular instance).

Removing the Snap Ring

  • To expose the retaining snap ring:

    • A set of snap ring pliers is required for removal.

    • Overview of the procedure:

    • Compress the return spring slightly, allowing access to the snap ring.

    • Care needs to be taken to avoid bending the retainer, which can complicate reassembly.

Piston and Seals

  • Removal of the piston occurs smoothly.

  • Identification of seals present:

    • Lip seals are noted to potentially be of square cup design as well.

    • Occasional observation that the inner seal might be attached to the housing, indicating that only one seal might be present on the piston itself.

Reassembly Considerations

  • Tools needed for reassembling the piston:

    • The necessity of assembly tools is emphasized for correct reinstallation.

    • Discussion regarding the specific tools used for lip seals: some aftermarket tools are discussed, with costs outlined:

    • OE tools cost around $3-$4 for multiple seals.

    • Aftermarket tools might cost approximately $90 for a set.

Reassembly Process

  • Steps to reassemble:

    • Reinstallation of the piston, return spring, retainer, and snap ring.

    • Integration of frictions and steels into the clutch.

  • Discussion on measuring clutch clearance:

    • Two primary tools for measurement:

    • Feeler gauge

    • Dial indicator: often preferred for accuracy.

    • A brief tutorial on how to set up the dial indicator appropriately.

      • Stress on attaching the dial indicator to the housing instead of the table to ensure accurate readings during movement.

      • Use of vice grip or a gooseneck style for aluminum housings.

Measurement Scenarios

  • Overview of measurement considerations when calculating clearance:

    • Importance of taking measurements accurately to ensure effectiveness in adjustment.

  • Mention of potential variances that can arise from measurements:

    • A clearer understanding of tolerances and how they relate back to the assembly based on function.

  • Average clearance standard to aim for: 10-15 thousandths per friction.

  • Clarification on realistic expectations regarding friction counts in clutches, generally ranging from 3 to 6 frictions.

Adjustments Based on Measurement

  • If the measured clearance appears too high:

    • Understanding the implications of larger numbers compared to previous measurements.

  • Goal considered: adjustment of clearance toward 45 thousandths or related specifications as per requirements.

  • Discusses the potential for using thicker snap rings as an adjustment tool to manage clearance.

  • Step-by-step requirements include:

    • Measuring the snap ring thickness to establish available options and select correctly sized options for satisfactory operation.

Parts Catalog and Sourcing

  • Emphasis on verifying parts availability:

    • Guidance on where to look for parts through suppliers such as Transstar and WIT:

    • Explanation of supplier discretion based on payment issues with educational institutions.

    • Discussion on searching for parts by specific transmission models, like the 4R70W, detailing how to navigate the parts catalog effectively.

  • Note on the diversity of parts and models available, considering potential availability of historically produced components.

  • Final notes on creativity and innovation regarding parts adaptations, like the potential for machining parts to required specifications when necessary, emphasizing the need for a skill set in a machine shop environment.