Alto DA-102 Marine Flywheel Damper Plate | 6.18 in. OD | 26-Spline | 6 Red Springs | Replaces Westerbeke 011618 | ZF 3307316002

Alto DA-102 — Marine Flywheel Damper Plate | 6.18 in. OD | 26-Spline | 6 Red Springs | Replaces Westerbeke 011618 | ZF/Hurth 3307316002

Alto DA-102 is a marine flywheel damper plate with a 6.18 in. outside diameter, 26-spline drive hub, 6 red dampening springs, and a 5-bolt equally spaced flywheel mounting pattern. The smaller OD and 5-bolt pattern distinguish the DA-102 from larger Big Block gasoline damper plates such as the DA-107 and DA-108 — the DA-102 is sized for smaller displacement and diesel inboard marine engine applications including Westerbeke and Paragon. Alto DA-102 replaces Westerbeke 011618, Sierra 18-2300, Paragon 12554, and ZF/Hurth 3307316002. Alto Products Corp. is a leading manufacturer of marine flywheel damper plates and transmission components for Westerbeke, Paragon, ZF, Hurth, and related applications.

Confirm Fitment Before Ordering

Confirm your engine flywheel uses a 5-bolt equally spaced pattern and your transmission input is 26-spline before ordering. Contact us with your engine model, serial number, and transmission model and we’ll verify correct application by email, text, or live chat.

Part Specifications

• Alto Part Number: DA-102
• OEM Cross-References: Westerbeke 011618 | Sierra 18-2300 | Paragon 12554 | ZF/Hurth 3307316002
• Outside Diameter: 6.18 in.
• Spline Count: 26-spline
• Springs: 6 red dampening springs
• Bolt Pattern: 5 equally spaced bolt holes
• Also Known As: Flywheel flex plate, transmission drive plate
• Vendor: Alto Products Corp.

Additional Information

• Vendor: Alto Products Corp.
• Part Number: DA-102
• OEM Cross-References: Westerbeke 011618, Sierra 18-2300, Paragon 12554, ZF/Hurth 3307316002
• Outside Diameter: 6.18 in.
• Spline Count: 26-spline
• Springs: 6 red dampening springs
• Bolt Pattern: 5 equally spaced bolt holes

Installation Notes

Installation should be performed by a qualified marine technician following the applicable service manual for your engine and transmission combination. Verify flywheel bolt pattern and transmission spline count before installation.

Frequently Asked Questions

Q: What does Alto DA-102 replace?
A: Alto DA-102 replaces Westerbeke 011618, Sierra 18-2300, Paragon 12554, and ZF/Hurth 3307316002.

Q: What engines and transmissions does Alto DA-102 fit?
A: Alto DA-102 is designed for smaller displacement and diesel inboard marine engine applications, including Westerbeke and Paragon transmission systems. Cross-references to ZF/Hurth 3307316002 indicate compatibility with applicable Hurth and ZF transmission models. Contact us with your engine model and serial number to confirm correct application.

Q: How does DA-102 differ from DA-107 and DA-108?
A: DA-102 features a 6.18 in. OD with 6 red springs and a 5-bolt pattern — designed for smaller displacement and diesel inboard applications. DA-107 (13.25 in. OD, 8 purple springs) and DA-108 (13-1/4 in. OD, 8 white springs) are both larger plates for GM and Chrysler Big Block gasoline marine engines. Do not substitute — confirm the correct plate for your specific engine and flywheel configuration.

Q: What bolt pattern does Alto DA-102 use?
A: Alto DA-102 uses 5 equally spaced bolt holes. Confirm your engine flywheel matches this pattern before ordering.

Q: What is a flywheel damper plate?
A: A flywheel damper plate (also called a flex plate or transmission drive plate) mounts to the engine flywheel and connects to the transmission input. The dampening springs absorb torsional shock between the engine and transmission, protecting both components from driveline shock loads during acceleration and deceleration.