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Velvet Drive C80-074 Damper Plate | 7.98 in., 8-Hole, 26-Spline | 1004-650-003

Velvet Drive C80-074 Damper Plate | 7.98 in., 8-Hole, 26-Spline | 1004-650-003

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$980.64 - $980.64
$980.64
$980.64 - $980.64
$980.64
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Velvet Drive C80-074 Flywheel-to-Transmission Damper Plate

Part Number: C80-074  |  Velvet Drive Part Number: 1004-650-003  |  Brand: Borg Warner / Velvet Drive

Borg Warner / Velvet Drive C80-074 (1004-650-003) is a spring-damped flywheel-to-transmission drive plate designed to absorb torsional vibration between the engine flywheel and marine transmission input shaft. The spring-damped center section smooths drivetrain pulses and reduces shock loading on the transmission input components during engagement and load changes.

The C80-074 measures 7.98 in. (202.7 mm) outside diameter, uses an 8-hole flywheel bolt pattern, and has a 26-tooth input spline. These three dimensions must all match the installation — Velvet Drive offers several visually similar damper plates with different diameters, bolt patterns, and spline counts that are not interchangeable.

Note on part number conflicts: Some online catalog sources associate 1004650003 with a larger 10.25 in. Detroit Diesel plate. The C80-074 reference specifically identifies the 7.98 in., 8-hole, 26-spline configuration documented here. Match by the C80-074 damper number and the physical dimensions above, not by the normalized 10-digit number alone.

Specifications

  • Damper Number: C80-074
  • Velvet Drive Part Number: 1004-650-003 / 1004650003
  • Brand: Borg Warner / Velvet Drive
  • Product Type: Flywheel-to-Transmission Torsional Damper Plate
  • Outside Diameter: 7.98 in. (202.7 mm)
  • Mounting Pattern: 8 equally spaced holes
  • Mounting Hole Diameter: approx. 0.34 in. (8.6 mm)
  • Mounting Bolt Circle: approx. 7.12–7.13 in. (180.8–181.1 mm)
  • Input Spline Count: 26 teeth
  • Spline Diameter: approx. 1.35 in. (34.3 mm)
  • Rated Torque: approx. 350 lb-ft (475 N·m)
  • System: Flywheel / marine transmission drivetrain
  • Weight: approx. 2.5 kg / 5.5 lb

Compatible Applications

Fitment is determined by the flywheel bolt pattern, plate diameter, and transmission input spline — not by transmission model or engine brand alone. Documented applications include:

  • Perkins 6.354 marine diesel engines with compatible Velvet Drive transmissions
  • Selected GM-based marine engines with compatible Borg Warner / Velvet Drive transmission installations
  • Compatible Hurth marine transmission installations using the same spline and flywheel dimensions

Always confirm all three critical dimensions before ordering: 7.98 in. OD, 8-hole bolt pattern, and 26-tooth spline.

Fitment Notice

Before ordering, verify all of the following for your installation:

  • Outside diameter is 7.98 in. (202.7 mm)
  • Flywheel mounting pattern uses 8 equally spaced holes
  • Bolt circle is approximately 7.12 in. (181 mm)
  • Transmission input spline is 26 teeth
  • Spline diameter is approximately 1.35 in. (34.3 mm)
  • Existing part cross-references C80-074 / 1004-650-003 / 1004650003

Several Velvet Drive damper plates share a similar appearance but differ in diameter, hole count, and spline. Matching all physical dimensions is essential — a plate that bolts to the flywheel but has the wrong spline pitch or offset will not function correctly and can damage the transmission.

When to Replace the Damper Plate

Replace the damper plate when any of the following are found:

  • Damper springs are broken, loose, or have fallen out
  • Excessive rotational play is present at the spring hub
  • Rattling or knocking is heard between the engine and transmission at idle or on gear engagement
  • The center spline is visibly worn or damaged
  • The plate is cracked, distorted, or shows signs of heat damage
  • Drivetrain vibration has increased at all speeds
  • Transmission removal exposes significant deterioration or spring loss

A worn or broken damper plate allows unfiltered torsional shock to reach the transmission input shaft and can accelerate wear on internal transmission components.

Installation Notes

  • Inspect the flywheel face, mounting hardware, transmission input spline, and bellhousing alignment before installing the new plate
  • Install the plate in the correct orientation per the transmission or engine manufacturer’s procedure
  • Use the engine manufacturer’s specified flywheel fasteners and torque values — do not substitute hardware
  • Ensure the 26-spline hub engages the transmission input shaft freely — do not force the transmission into position using the bellhousing bolts
  • After assembly, rotate the engine and transmission by hand to verify free rotation and no abnormal contact
  • Check for any drivetrain noise or vibration after the initial test run and re-inspect all fastener torque

Cross-Reference Part Numbers

  • Borg Warner / Velvet Drive: C80-074 / 1004-650-003 / 1004650003
  • Alto: DA-103 (replacement cross-reference)

Related Products

Parts Desk Insights

Best use case: C80-074 is typically needed when a Perkins 6.354 diesel or compatible GM-based engine installation with a Velvet Drive transmission shows drivetrain rattle, clunking on gear engagement, or increased vibration that points to the flywheel coupling rather than the engine mounts or transmission itself. It’s also the correct service part when the transmission is being removed for rebuild or replacement and the damper plate shows spring wear or loss — replacing it at that point costs far less than a return visit if the damper fails shortly after the transmission is reinstalled.

Common issues: The most frequent ordering mistake is selecting by diameter alone. C80-074 is a 7.98 in. plate with 26 splines. Velvet Drive also makes an 8-hole plate in a larger diameter for different applications, and the spline counts differ between models. Confirm all three dimensions — diameter, hole count, and spline — from the original plate or the engine’s parts diagram before ordering. Also be aware that the 10-digit normalized number 1004650003 has been associated with more than one plate in third-party catalogs; the C80-074 designation is the reliable identifier for the 7.98 in. configuration.

Shipping information

In-stock and OEM parts: ship same or next business day.

Locally warehoused items: ship within 1-3 business days.

Special-order items: timeline confirmed after order.

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