Flywheels, Flexplates & Damper Plates - Drive Couplers

Replaces Stock Coupler

DriveGuardian is a patented device that reduces the leading cause of pitted/broken gears and twisted shafts in Bravo sterndrives. DriveGuardian replaces the factory Bravo rubber coupler with a multi-plate torque-limiting clutch that is calibrated to your specific application. The cause of many gear and shaft failures is the enormous torque spike that is generated each time the propeller either partially or fully leaves the water, and then is re-submerged. These spikes are generated by the inertia of the rotating engine components and can be 2X-4X the actual torque output of the engine. Each spike lasts only a fraction of a second and throttling alone cannot eliminate them. Every spike causes stress to the gears and shafts which greatly reduces their usable life.

DriveGuardian has been proven on the racecourse with numerous National and World Championships in offshore powerboat racing.

Prior to shipment, each DriveGuardian is mounted to a specially built dyno and load tested to ensure they meet strict manufacturing standards. Your DriveGuardian is then calibrated for your specific engine and drive combination.

DriveGuardian is manufactured with billet aluminum housings and Kevlar clutch plates. DriveGuardian replaces the stock rubber coupler and installation is a direct bolt-on with no additional modifications required. Includes a 1-year Manufacturer Warranty.

Make sure to fill out this calibration questionnaire when ordering.

• Made in the USA, patent pending
  
• Anodized billet aluminum for maximum corrosion resistance, even in saltwater environments.
• 100% rebuildable
• Direct replacement for the OEM coupler, zero modifications required.
  
• Chromoly splines that are stronger than the OEM coupler and can be replaced (for less $$ than purchasing a replacement OEM coupler) when required. 
  
• Replaceable Polyurethane dampeners with external wear indicator
• Rated for 1,000+HP
  
• Perfect for diesel engines and applications that see extended idling (which is a common issue for the OEM coupler).
• Unlike the OEM coupler, will not break loose and spin if the dampening material fails (Get Home Mode)
• Two year warranty
• Replaces Mercruiser # 8M0098795, 861523A18, and 861523A9

• Includes 2 Polyurethane dampeners and 1 spline hub.
• Used on 221-1022 Drive Couplers ONLY!

• Made in the USA, patent pending
• Ideal for Diesel applications, Boats that do a lot of idling 
• Grease fitting for easy access to service splines
• Anodized billet aluminum for maximum corrosion resistance, even in saltwater environments.
• 100% rebuildable
• Direct replacement for the OEM coupler, zero modifications required.
• Chromoly splines that are stronger than the OEM coupler and can be replaced (for less $$ than purchasing a replacement OEM coupler) when required. 
• Replaceable Polyurethane dampeners with external wear indicator
• Rated for 1,000+HP
• Perfect for diesel engines and applications that see extended idling (which is a common issue for the OEM coupler).
• Unlike the OEM coupler, will not break loose and spin if the dampening material fails (Get Home Mode)
• Two year warranty
• Replaces Mercruiser # 8M0098796, Supercedes 861523A7

Mercruiser HP Bravo Drive Coupler 8M0098795

• Replaces Mercruiser # 8M0098795 and 861523A9
• For use with Bravo Drives
• High Performance Coupler

Engine Coupler (1985 & Before) replaces MerCruiser part # 76850A2

This coupler is used on all older Chevy engines with 2 piece rear main seals.

Engine Coupler replaces MerCruiser part # 59826A3

This coupler is used on all Ford engines.

Engine Coupler (1986 & Up) replaces MerCruiser part # 14505A2

This coupler is used when a new replacement V6 or V8 Chevy with one piece rear main seal is used to replace an older V6 or V8 with a 2 piece rear main seal.

Engine Coupler with Yoke- Fits MCM GM V6 & V8 (305 & 350 CID) (1983-1993) & 454 MAG Alpha replaces MerCruiser part # 18643A7

Engine Coupler without Yoke - Fits MCM 3.0L (1999 & Up) GM V6 & V8 (305 & 350 CID) engines (1993 & Up) replaces MerCruiser part # 18643A5

Additional Details:

• For: 165, 170, 470, 3.7L s/n 6170297 & Up (1983-1989)
• For: 180, 190, 488, 3.7LX s/n 6170297 & Up (1983-1989)

Interchanges/Replaces

Mallory

• 9-72505

Mercruiser Stern Drive

• 97432A2

Additional Details:

• Fits: OMC 2.5L (1986), 3.0L (1986-90), 4.3L/5.0L/5.7L (1986) KW & KWB Suffix only.
• Fits: OMC 7.4L (1990-98), 8.2L (1992-93, 1998)

Interchanges/Replaces

OMC Stern Drive

• 3853962
• 983902
• 986338

Volvo Penta

• 3853962

Additional Details:

• Fits: 4.3L (1986-98), 5.0L (1986-88, 1998), 5.7L (1986-92, 1994, 1996-98)

Interchanges/Replaces

OMC Stern Drive

• 3853917
• 3858437
• 984290
• 986120

Volvo Penta

• 3853917
• 3858437

Additional Details:

• Fits: 5.0L & 5.8L (1989-96)

Interchanges/Replaces

OMC Stern Drive

• 3853862
• 985727

Volvo Penta

• 3853862

Additional Details:

• Fits: 7.5L / 460 King Cobra 1987-90

Interchanges/Replaces

OMC Stern Drive

• 984537
• 986232

Engine Alignment Tool replaces MerCruiser part # 91-805475A1

Aligns engine & drive unit during installation. Fits All MC-I, R-MR, Alpha 1, Alpha One/Gen 2 drives, All Bravo drives, All OMC Cobra drives

Engine Coupler Wrench 91-35547

Removes and installs the engine coupler, torques the bolts on the couplers that mount directly to the crankshaft, 1/2 in. drive.