Alto DA-303 Marine Flywheel Damper Plate | 6.189" OD | 10-Spline | 250Nm | Hurth ZF | Replaces Hurth 288240 | ZF 3306316002 | Universal 19398

Alto DA-303 — Marine Flywheel Damper Plate | 6.189" OD | 10-Spline | 250Nm | Replaces Hurth 288240 / ZF 3306316002 / Universal 19398

Alto DA-303 is a flywheel-mounted marine transmission damper plate designed for use with Hurth, ZF, and compatible transmissions on small diesel marine engines including Westerbeke, Universal, Perkins, and others. The damper plate mounts to the engine flywheel and connects to the transmission input shaft, absorbing torsional vibration and shock loads between the engine and transmission to protect drivetrain components from impact damage. Alto DA-303 replaces OEM references Hurth 288240, ZF 3306316002, and Universal 19398. Confirm flywheel bolt pattern, outside diameter, spline count, and transmission input shaft specification against your engine and transmission service documentation before ordering — damper plate fitment is application-specific.

Confirm Fitment Before Ordering

At this price point, confirming correct fitment before ordering is essential. Contact us before ordering — have your engine make, model, and serial number, and your transmission make and model ready. Our team can confirm the correct damper plate for your specific engine-transmission combination by email, text, or live chat.

Part Specifications

• Alto Part Number: DA-303
• OEM Cross-References: Hurth 288240, ZF 3306316002, Universal 19398
• Outside Diameter: 6.189 inches
• Inner Drive Hub: 10-spline
• Spring Configuration: 6 springs, 3 different sizes
• Maximum Torque Rating: 250Nm
• Compatible Transmissions: Hurth, ZF, and compatible manufacturers
• Engine Applications: Westerbeke, Universal, Perkins, and other small diesel marine engines
• Sold: Individually
• Vendor: Alto Products Corp.

Additional Information

• Vendor: Alto Products Corp.
• Part Number: DA-303
• OEM Cross-References: Hurth 288240, ZF 3306316002, Universal 19398

Installation Notes

Installation should be performed by a qualified marine diesel technician following the applicable engine and transmission service manuals. Verify flywheel bolt pattern, outside diameter, spline count, and torque rating compatibility before installation — incorrect damper plate specification will result in improper fit or drivetrain damage.

Frequently Asked Questions

Q: What OEM parts does Alto DA-303 replace?
A: Alto DA-303 replaces Hurth 288240, ZF 3306316002, and Universal 19398.

Q: What engines and transmissions does Alto DA-303 fit?
A: Alto DA-303 is designed for use with Hurth and ZF transmissions on small diesel marine engines including Westerbeke, Universal, Perkins, and other compatible applications. Confirm your specific engine-transmission combination by contacting us with your engine make, model, and serial number, and your transmission make and model before ordering.

Q: What does a flywheel damper plate do?
A: A flywheel damper plate mounts between the engine flywheel and the transmission input, absorbing torsional vibration and shock loads generated by the diesel engine during engagement and operation. The spring assembly within the damper plate cushions drivetrain impact, protecting both the transmission and engine from premature wear caused by torsional stress.

Q: How do I confirm DA-303 is the right damper plate for my setup?
A: Confirm the following against your engine and transmission service documentation: outside diameter (6.189"), spline count (10-spline), flywheel bolt pattern, and maximum torque rating (250Nm). Contact us with your engine and transmission details and we’ll verify correct fitment by email, text, or live chat before you order.

Q: What are the signs of a worn or failed damper plate?
A: Common symptoms include vibration or shuddering during engagement, clunking or rattling from the transmission coupling area, increased drivetrain noise at idle, and in severe cases, difficulty engaging gear. A failed damper plate spring can also allow metal-to-metal contact between the flywheel and transmission input, causing accelerated drivetrain wear.