Drive System Parts - Lower Unit Parts

2-1/2" to 3" I.D. External Flapper
Your Price:
$19.99

2-1/2" to 3" I.D. External Flapper

810-EG-300

2-1/2" to 3" I.D. External Flapper

These are excellent American-made flaps that will not curl like cheap import copies. These are a must for boats with a very close distance between exhaust ports and the water line Clamp is included. This flap has a 3" ID and must be cut down for 2-1/2" applications. Sold each.


3-1/2" to 4" I.D. External Flapper
Your Price:
$19.99

3-1/2" to 4" I.D. External Flapper

810-EG-400

3-1/2" to 4" I.D. External Flapper

These are excellent American-made flaps that will not curl like cheap import copies. These are a must for boats with a very close distance between exhaust ports and the water line Clamp is included. This flap has a 4" ID and must be cut down for 3-1/2" applications. Sold each.


3-1/2" Internal Butterfly Style Rubber Replacement Exhaust Flapper
Your Price:
$39.99

3-1/2" Internal Butterfly Style Rubber Replacement Exhaust Flapper

410-280172

3-1/2" Internal Butterfly Style Rubber Replacement Exhaust Flapper

These original equipment style rubber flaps are designed to replace missing or burned out flaps. They can also be easily retro-fitted to tips that were not originally equipped with flaps. Note: Flaps are recommended in all wet exhaust systems. Sold each.


4" Internal Butterfly Style Rubber Replacement Exhaust Flapper
Your Price:
$39.99

4" Internal Butterfly Style Rubber Replacement Exhaust Flapper

410-280173

4" Internal Butterfly Style Rubber Replacement Exhaust Flapper

These original equipment style rubber flaps are designed to replace missing or burned out flaps. They can also be easily retro-fitted to tips that were not originally equipped with flaps. Note: Flaps are recommended in all wet exhaust systems. Sold each.


4" Silent Seal Easy Service Exhaust Flapper Assembly
Your Price:
$39.99

4" Silent Seal Easy Service Exhaust Flapper Assembly

410-280179

4" Silent Seal Easy Service Exhaust Flapper Assembly (Each)

At last an answer to eliminating the annoying clanking and banging caused by old design stainless anti-burn exhaust flaps. It seems the many complaints of knocking engine noises and fears caused by the sounds of anti-burn flaps have created the demand to develop and cure this problem once and for all. The all new "Silent Seal" exhaust flap with its special high temp burn resistant rubber compounded exhaust flap and stainless steel cage design provide the perfect answer. This new flap design provides a superior seal and quiet operation. These flaps can easily be retrofitted to earlier style tips with just minor brazing or welding of the flap cage to your exhaust tip.


4" Silent Seal Easy Service Replacement Exhaust Flapper
Your Price:
$28.99

4" Silent Seal Easy Service Replacement Exhaust Flapper

410-280181

4" Silent Seal Easy Service Exhaust Replacement Flapper (Each)

These kits include a replacement flap, (2) two screws and (2) two flanges (front & back) to replace old or damaged flaps in Hardin Marine 4" exhaust tips.
These will fit in #410-281400, #410-281401, #410-281402, and #410-281403 exhaust tips.
These will fit in #410-280185, #410-280190, AND #410280195 Flap Assemblies.
The mounting holes are 1" apart

These flaps are 3-3/4" in diameter to inside of the 4" Hardin exhaust tip.


4" Silent Seal Replacement Flapper
Your Price:
$18.99

4" Silent Seal Replacement Flapper

410-280178

4" Silent Seal Replacement Flapper

This flapper is manufactured from a high temperature, burn resistant specialrubber compound.  This is the same flapper used in part number 410-280179Silent Seal flapper Assembly.

 

3-15/16" od with 1" center to center on the mounting holes. SOLD EACH.

4" Slip-On Silent Seal Flap Assembly
Your Price:
$49.99

4" Slip-On Silent Seal Flap Assembly, Stainless Steel

410-280195

4" Slip-On Silent Seal Flap Assembly, Stainless Steel - Sold Each

At last, a combination of our best flap in what is now the easiest installation ever. Whether your tired of "Clanking" metal flaps or just can't believe you have to cut out and braze in a new butterfly style flap; there finally is a solution. Hardin Marine has designed this easy to install effective slip on version of the popular "Silent-Seal"exhaust flap. No cutting or welding, this unit is designed to merely slip over the inlet side of your existing 4" exhaust tip, and is held or clamped into place by your existing exhaust hose. It couldn't be easier. The unit can now be serviced externally, due to the silent seal flap design. There are two retaining screws that bolt the tab to the slip on cage for easy serviceability. Definitely one of the best new conceived part of the year.

OD is 4 1/8"

NOTE: The Outside Diameter of the tip these are to be installed on must be  4".

4" Stainless Steel Exhaust Flappers
Your Price:
$329.99

4" Stainless Steel Exhaust Flappers

410-280175

4" Stainless Steel Exhaust Flappers (Sold in pairs)

If you're like us and can't stand the ugly sight of those black rubber Salisbury style flappers then feast your eyes on this piece.  Hardin Marine has handcrafted these beautifully polished stainless steel exhaust flappers to eliminate that eyesore.  The flappers feature and O-ring seal to eliminate the possibility of any noise from the flapper during normal operation.  This new flapper represents the ultimate finishing touch to your boats exhaust system.  Requires minimum of 1-1/2" of clamping space. Available in 4", 4-1/2" or 5" sizes. Sold in Pairs. 


Replacement Flap Assembly
Your Price:
$71.99

4" Stainless Steel Replacement Corsa Flap Assembly

270-10900

Replacement Flap Assembly for Corsa Tips and Diverters. For 4" Tips and diverters. Can be used in non-Corsa tips and diverters. 


5" Stainless Steel Exhaust Flappers
Your Price:
$329.99

5" Stainless Steel Exhaust Flappers

410-280177

5" Stainless Steel Exhaust Flappers (pair)

If you're like us and can't stand the ugly sight of those black rubber Salisbury style flappers then feast your eyes on this piece.  Hardin Marine has handcrafted these beautifully polished stainless steel exhaust flappers to eliminate that eyesore.  The flappers feature and O-ring seal to eliminate the possibility of any noise from the flapper during normal operation.  This new flapper represents the ultimate finishing touch to your boats exhaust system.  Available in 4", 4-1/2" or 5" sizes.


4-1/2" Stainless Steel Exhaust Flappers
Your Price:
$429.99

6" Stainless Steel Exhaust Flappers

410-280166

6" Stainless Steel Exhaust Flappers (EACH)

Due to the popularity of these Hardin Marine handcrafted beautifully polished stainless steel exhaust flappers they have created the option for larger versions. The flappers feature and O-ring seal to eliminate the possibility of any noise from the flapper during normal operation.  This new flapper represents the ultimate in durability and finishing touch to your boats exhaust system. These units are manufactured from 316L Stainless Steel and a silicon seal  *NOTE they require a minimum of 1-1/2" of exhaust tip for adequate clamping and attachment.  Slicone is rated to 250C. Flapper weighs approx 1.05lb (0.475kg)

These units are SOLD EACH and are custom built and require 2-3 weeks for delivery!


8-1/4" Stainless Steel Exhaust Flappers
Your Price:
$899.99

8-1/4" Stainless Steel Exhaust Flappers

410-280168

8-1/4" Stainless Steel Exhaust Flappers (EACH)

Due to the popularity of these Hardin Marine handcrafted satin stainless steel exhaust flappers they have created the option for larger versions. The flappers feature and O-ring seal to eliminate the possibility of any noise from the flapper during normal operation.  This new flapper represents the ultimate in durability and finishing touch to your boats exhaust system. These units are manufactured from 316L Stainless Steel and a silicon seal

*NOTE they require a minimum of 1-1/2" of exhaust tip for adequate clamping and attachment. 

These units are SOLD EACH and are custom built and require 2-3 weeks for delivery!


Angle Cut Exhaust Clamp on Flap, Stainless Steel
Your Price:
$169.99

Angle Cut Exhaust Clamp on Flap, Stainless Steel

410-280185

Angle Cut Exhaust Clamp on Flap, Stainless Steel

If you've always wanted the stylish look of a angled cut tip but couldn't due to the fact you really needed the safety of an external flapper then we have the answer you've been looking for. These high polished 316L stainless steel external flaps are designed to slides over an existing 4" straight cut tip and provide the security of a secondary or even primary exhaust flapper. Sold in pairs.

Replacement Flap Assembly
Your Price:
$52.99

Corsa Exhaust Linkage Replacement Kit

270-10830

Linkage replacement kit that repairs or replaces components that connect the solenoids (#270-10871) to the shafts. Includes links, washers, pins, clips and 3/8" adjustment assembly. NOTE: Each kit contains parts for one diverter.


Gear Repair Kit
Your Price:
$853.99

Normally Ships in 7-10 Days. Rush proccessing is available on Mallory items: See here.

Gear Repair Kit

676-18-2405

Additional Details:

  • For: MR/Alpha I

Interchanges/Replaces

GLM

  • 25125

Mallory

  • 9-79200

Mercruiser Stern Drive

  • 43-803091T1

List of Containing Parts

Sierra Item # OE/Competitor # Quantity Description Image Comments
18-1117Chrysler/Force/US Marine
  • 31-42647A1
  • 31-F694057
GLM
  • 21610
Johnson/Evinrude Outboard
  • 387817
  • 5007751
Mallory
  • 9-75121
Mercruiser Stern Drive
  • 31-42647
  • 31-42647A1
Mercury Marine
  • 31-42647A1
OMC Stern Drive
  • 387817
1Pinion Bearing N/A
18-1143GLM
  • 21580
Mallory
  • 9-75107
Mercruiser Stern Drive
  • 31-36387A1
Mercury Marine
  • 31-36387A1
1Tapered Roller Bearing N/A
18-1155GLM
  • 21620
Mallory
  • 9-75114
Mercruiser Stern Drive
  • 30-17927
  • 30-35914
  • 30-88957
  • 30-88957A1
  • 30-88957T
Mercury Marine
  • 30-17927
  • 30-35914
  • 30-88957
  • 30-88957A1
  • 30-88957T
Mercury Race Outboard
  • 30-35914
  • 30-88957
  • 30-88957A1
  • 30-88957T
1Ball Bearing N/A
18-1158Chrysler/Force/US Marine
  • 31-30956
  • 31-F523058
GLM
  • 11410
Honda Outboard
  • 91053-ZW1-003
Johnson/Evinrude Outboard
  • 387247
Mallory
  • 9-75112
Mercruiser Stern Drive
  • 31-30956
  • 31-30956T
Mercury Marine
  • 31-30956
  • 31-30956T
OMC Stern Drive
  • 387247
1Carrier Bearing N/A
18-2202GLM
  • 11060
Mallory
  • 9-73474
Mercruiser Stern Drive
  • 52-66063
  • 52-824112
  • 52-853594
  • 52-853594T
Mercury Marine
  • 52-824112
1Sliding Clutch N/A
18-2285GLM
  • 23220
Mercruiser Stern Drive
  • 15-35931A1
  • 15-47397A1
Mercury Marine
  • 15-47397A1
1Shim Set N/A
18-2294GLM
  • 23210
Mercruiser Stern Drive
  • 15-42637A1
Mercury Marine
  • 15-42637A1
  • 15-8M0063267
1Shim Kit N/A
18-2298GLM
  • 11381
Mallory
  • 9-72640
  • 9-72643
Mercruiser Stern Drive
  • 14-17460
  • 14-18323
Mercury Marine
  • 14-17460
  • 14-18323
1Tab Washer N/A
18-2299GLM
  • 11380
Mallory
  • 9-72641
Mercruiser Stern Drive
  • 14-52833
  • 14-79447
Mercury Marine
  • 14-79447
1Tab Washer N/A
18-2343Chrysler/Force/US Marine
  • 12-92721
  • 12-F694186
GLM
  • 32800
Mallory
  • 9-78108
Mercruiser Stern Drive
  • 12-92721
Mercury Marine
  • 12-92721
1Pinion Nut Washer N/A
18-2652GLM
  • 87510
Mallory
  • 9-74304
Mercruiser Stern Drive
  • 26-33144A1
  • 26-33144A2
  • 26-89238A1
1Lower Unit Seal Kit N/A
18-3719Chrysler/Force/US Marine
  • 11-35921
  • 11-826375
  • 11-F694188
GLM
  • 11190
Johnson/Evinrude Outboard
  • 314730
Mallory
  • 9-78103
Mercruiser Stern Drive
  • 11-35921
Mercury Marine
  • 11-35921
  • 11-47411
  • 11-826375
OMC Stern Drive
  • 314730
1Pinion Nut N/A
18-2206-11Gear Set N/A

Lower Gear Housing
Your Price:
$1,495.99

Normally Ships in 7-10 Days. Rush proccessing is available on Mallory items: See here.

Lower Gear Housing

676-18-2401

Key Features:

  • Includes tapered roller bearing for non-tractor 14/28 or 17/28 gears

Additional Details:

  • Bore Size: 3.2635-3.2650
  • For: MR/Alpha style

Interchanges/Replaces

GLM

  • 18000

Mallory

  • 9-79127

Mercruiser Stern Drive

  • 1623-8951A15
  • 1623-8951A27
  • 1623-8951A37
  • 1623-8951A5

List of Containing Parts

Sierra Item # OE/Competitor # Quantity Description Image Comments
18-2244Chrysler/Force/US Marine
  • 10-79953
  • 10-79953A2
  • 10-F50109
  • F40109
GLM
  • 22420
Mallory
  • 9-72650
Mercruiser Stern Drive
  • 10-28634
  • 10-28634A1
  • 10-79953
  • 10-79953A2
  • 10-79953Q04
  • 10-79953Q2
  • 816610A1
  • 816610A2
Mercury Marine
  • 10-20259
  • 10-28634
  • 10-28634A1
  • 10-79953
  • 10-79953A2
  • 10-79953Q04
  • 10-79953Q2
1Drain Screw N/A
18-7176Chrysler/Force/US Marine
  • 25-90011
  • 25-F74305
  • F694555
  • F74035
  • F74305-1
GLM
  • 81390
Mallory
  • 9-76554
Mercruiser Stern Drive
  • 25-896523
  • 25-90011
Mercury Marine
  • 25-896523
  • 25-90011
1O-Ring N/A
18-6093GLM
  • 12702
Mercruiser Stern Drive
  • 806105A1
  • 97-806105
  • 97-806105Q1
  • 97-806105T1
1Anode N/A
18-2914GLM
  • 31010
Mallory
  • 9-60034
Mercruiser Stern Drive
  • 27-32433
  • 27-856081
  • 27-8M0090319
Mercury Marine
  • 27-30603
  • 27-32433
  • 27-85608
  • 27-856081
  • 27-8M0090319
1Water Pump Gasket N/A
18-1143GLM
  • 21580
Mallory
  • 9-75107
Mercruiser Stern Drive
  • 31-36387A1
Mercury Marine
  • 31-36387A1
1Tapered Roller Bearing N/A
18-2376Mallory
  • 9-72602
Mercruiser Stern Drive
  • 73020A20
  • 818763A10
  • 818763A4
1Carrier Bearing N/A
18-2285GLM
  • 23220
Mercruiser Stern Drive
  • 15-35931A1
  • 15-47397A1
Mercury Marine
  • 15-47397A1
1Shim Set N/A
18-7159GLM
  • 83440
Mallory
  • 9-76544
Mercruiser Stern Drive
  • 25-31534
  • 25-48451
Mercury Marine
  • 25-31534
1O-Ring N/A
18-1117Chrysler/Force/US Marine
  • 31-42647A1
  • 31-F694057
GLM
  • 21610
Johnson/Evinrude Outboard
  • 387817
  • 5007751
Mallory
  • 9-75121
Mercruiser Stern Drive
  • 31-42647
  • 31-42647A1
Mercury Marine
  • 31-42647A1
OMC Stern Drive
  • 387817
1Pinion Bearing N/A
18-3199GLM
  • 21870
Mallory
  • 9-78115
Mercruiser Stern Drive
  • 93423
  • 934231
  • 934233
1Water Pickup N/A
18-3198GLM
  • 21880
Mallory
  • 9-78114
Mercruiser Stern Drive
  • 93424
  • 934241
  • 934243
1Water Pickup N/A
18-3197GLM
  • 12822
Mallory
  • 9-78130
Mercruiser Stern Drive
  • 10-67373
  • 10-76156
Mercury Marine
  • 10-76156
1Water Pick-Up Insert Screw N/A
18-2915GLM
  • 31020
Mallory
  • 9-60035
Mercruiser Stern Drive
  • 27-32434
  • 27-856091
  • 27-858524
Mercury Marine
  • 27-30604
  • 27-32434
  • 27-85609
  • 27-856091
  • 27-858524
1Water Pump Gasket N/A
18-2919GLM
  • 31050
Mallory
  • 9-60031
Mercruiser Stern Drive
  • 27-426311
Mercury Marine
  • 27-42631
  • 27-426311
1Water Pump Gasket N/A
18-6011Honda Outboard
  • 41107-ZW1-003ZA
Mercruiser Stern Drive
  • 31640
  • 316404
  • 31640A1
  • 97-31640Q4
Mercury Marine
  • 31640
  • 316403
  • 316404
  • 31640A1
  • 31640A2
  • 31640A4
  • 31640B4
  • 72436A1
  • 97-31640Q4
1Anode N/A
18-2945Chrysler/Force/US Marine
  • 12-19183
  • F50556
  • F8077
  • F8186
Johnson/Evinrude Outboard
  • 307552
Mallory
  • 9-60101
  • 9-60102
Mercruiser Stern Drive
  • 12-19183
  • 12-191832
  • 12-191833
  • 12-19183B
  • 12-20260
  • 12-20260B
Mercury Marine
  • 12-19183
  • 12-191832
  • 12-191833
  • 12-20260
1Drain Screw Gasket N/A
18-6245GLM
  • 21740
Mercruiser Stern Drive
  • 10-32470
Mercury Marine
  • 10-32470
  • 10-47580
  • 10-74728
1Anode Mounting Bolt N/A
NSSMercruiser Stern Drive
  • 10-806290
2Screw (#10-32 x 5/8")No ImageN/A
NSSMercruiser Stern Drive
  • 11-45812
  • 11-859124
1LocknutNo ImageN/A

Lower Unit Housing
Your Price:
$1,475.99

Normally Ships in 7-10 Days. Rush proccessing is available on Mallory items: See here.

Lower Unit Housing

676-18-2415

Additional Details:

  • For Ratios: 1:47:1, 1:62:1
  • Fits: Gen II (1998 & Up) S/N (0L100040 & Up)

Use With:

  • 18-2400: Complete Lower Unit Assembly

Interchanges/Replaces

Mallory

  • 9-79126

Mercruiser Stern Drive

  • 1623-815822A36

Straight Cut Exhaust Clamp on Flap, Stainless Steel
Your Price:
$159.99

Straight Cut Exhaust Clamp on Flap, Stainless Steel

410-280190

Straight Cut Exhaust Clamp on Flap, Stainless Steel

If you one of the thousands of people frustrated that Your beautiful boat's gleaming exhaust tips are finished off with an ugly rubber salsbury flap then we finally have your answer. These new 316L stainless steel clamp on external flaps slide on to and clamp to a 4" stainless exhaust tip. They are not only do the job their designed for but they will do it in style. Sold in pairs.

Overall length is 2-1/8" and the clamping surface required is 1"