New Lower Unit Gearcase Seal Kit Compatible With 2005-2021 Mercury Verado 250Hp 275Hp L6

MERCURY / MARINER VERADO L4 / L6 LOWER UNIT GEARCASE SEAL KIT — Comprehensive Service Kit (2005-2021+):

4.80" BULLET TORPEDO GEARCASE PLATFORM CONTEXT:
• Specifically for 4.80" Bullet Torpedo Gearcase Architecture
• Verado L4 (4-Cyl) and L6 (6-Cyl) Supercharged 4-Stroke Variants
• 15-Spline Drive Shaft
• Per Mercury Quicksilver Official: "Fits the 4.80 inch Torpedo gearcase on the FourStroke Verado outboard beginning with Model Year 2005"
• Distinct From Newer Verado V8 / V10 / V12 Generations (Different Gearcase)

MERCURY VERADO L4 (4-CYLINDER SUPERCHARGED) APPLICATIONS:
• Mercury Verado 135HP L4 Supercharged 4-Stroke Outboard 15-Spline (2007-2010)
• Mercury Verado 150HP L4 Supercharged 4-Stroke Outboard 15-Spline (2006-2014)
• Mercury Verado 175HP L4 Supercharged 4-Stroke Outboard 15-Spline (2006-2014)
• Mercury Verado 200HP L4 Supercharged 4-Stroke Outboard 15-Spline (2005-2011)

MERCURY VERADO L6 (6-CYLINDER SUPERCHARGED) APPLICATIONS:
• Mercury Verado 200HP L6 Supercharged 4-Stroke Outboard (2005-2014, Serial 0T980000 & up)
• Mercury Verado 225HP L6 Supercharged 4-Stroke Outboard (2005-2014, Serial 0T980000 & up)
• Mercury Verado 250HP L6 Supercharged 4-Stroke Outboard (2005-2014, Serial 0T801000 & up)
• Mercury Verado 275HP L6 Supercharged 4-Stroke Outboard (Per Mercury Quicksilver Official)
• Mercury Verado 300HP L6 Supercharged 4-Stroke Outboard (2008-2014, Serial 0P520553 & up)

MERCURY VERADO PRO L6 APPLICATIONS:
• Mercury Verado Pro 250HP L6 Supercharged 4-Stroke (2011-2021)
• Mercury Verado Pro 300HP L6 Supercharged 4-Stroke (2011-2021)

MARINER APPLICATIONS:
• Mariner Verado 135-300HP L4 / L6 Variants (Rebadged Mercury Verado)
• Same Year / HP / Configuration Coverage as Mercury Verado

⚠️ NOT COMPATIBLE WITH:
• Mercury Verado V8 4.6L 250 / 300 / 400HP (Newer Generation — Different Gearcase)
• Mercury Verado V12 7.6L 600HP (Newer Generation — Different Gearcase)
• Mercury Verado V10 5.7L 350-400HP (Newer Generation — Different Gearcase)
• Mercury Racing 400R / 450R / 500R Verado (Different Gearcase)
• Mercury 75-115HP L4 EFI FourStroke (Use 8M0088080 — Different Platform)
• Mercury 150HP FourStroke 3.0L NON-Supercharged (Different Platform)
• Mercury OptiMax / Pro XS 2-Stroke Outboards (Different Engine Architecture)
• Mercury V6 / V8 4-Stroke NON-Verado Outboards (Different Lower Unit)
• MerCruiser Sterndrive Applications (Different Drive Architecture)
• Mariner / Yamaha / Honda / Suzuki Outboards Other Than Verado Rebadge

SPECIFICATIONS:
• Type: Lower Unit Gearcase Seal Kit (Comprehensive)
• Application: Mercury/Mariner Verado L4 / L6 4-Stroke Supercharged Outboards
• Gearcase Architecture: 4.80" Bullet Torpedo Gearcase
• Drive Shaft: 15-Spline
• HP Range: 135 HP through 300 HP
• Engine Configurations: L4 (4-Cyl) and L6 (6-Cyl)
• Engine Type: 4-Stroke Supercharged
• Year Coverage: 2005-2021+ (Verado Production)
• Includes: Multiple Seals, O-Rings, Gaskets
• Material: Marine-Grade Rubber Compounds
• Function: Complete Lower Unit Seal Replacement
• Condition: New

OEM PART NUMBERS:
• Mercury: 26-830749A01 (Current OEM)
• Mercury: 830749A01 (Without 26- Prefix)

KIT CONTENTS:
• Lower Unit Gearcase Seals
• Multiple O-Rings (Various Sizes / Positions)
• Oil Seals (Prop Shaft and Drive Shaft Positions)
• Drain Plug Gasket
• Other Required Gaskets for 4.80" Bullet Torpedo Gearcase

WHEN TO USE THIS KIT:
• Lower Unit Complete Rebuild
• Annual Lower Unit Service Interval
• Water in Gear Oil (White / Milky Appearance)
• Gear Oil Leaking from Prop Shaft Area
• Gear Oil Leaking from Drive Shaft Area
• Replacing Forward / Reverse Gear Thrust Bearings
• Replacing Prop Shaft Bearings
• Drive Shaft Service
• Routine Preventive Maintenance for Verado 4.80" Bullet Gearcase

SYMPTOMS REQUIRING SEAL KIT REPLACEMENT:
• Milky / White Gear Oil at Service Drain (Water Contamination)
• Gear Oil Leaking from Prop Shaft Area
• Gear Oil Leaking from Drive Shaft Area
• Failed Pressure Test During Routine Service
• Lower Unit Running Hot
• Cloudy / Discolored Gear Oil
• Loss of Lubrication
• Routine Annual Service Interval Reached

INSTALLATION:
• Step 1: Drain old gear oil completely (note color / condition)
• Step 2: Remove lower unit from outboard
• Step 3: Take photos and notes of disassembly order / orientation
• Step 4: Disassemble gearcase per Mercury Verado service manual
• Step 5: Remove all old seals, gaskets, o-rings
• Step 6: Clean all sealing surfaces thoroughly
• Step 7: Inspect gearcase housing for damage or corrosion
• Step 8: Install new seals with proper orientation (lip direction critical)
• Step 9: Install new gaskets and o-rings with light marine grease
• Step 10: Reassemble gearcase per Mercury Verado service manual torque specs
• Step 11: Pressure test gearcase before reinstalling lower unit
• Step 12: Reinstall lower unit to outboard
• Step 13: Refill with proper Mercury High Performance SAE 90 Gear Lube
• Step 14: Test forward and reverse operation

⚠️ CRITICAL — VERIFY GEARCASE ARCHITECTURE:
• 4.80" Bullet Torpedo Gearcase (This Kit)
• Verado V8 / V10 / V12 Use Different Gearcase
• Mercury Racing Uses Different Gearcase
• Verify Gearcase Type Before Ordering

NOTE: Verify your OEM part number 26-830749A01 / 830749A01 AND your gearcase architecture (4.80" Bullet Torpedo Gearcase) before ordering. ***This kit fits ONLY Mercury/Mariner Verado L4/L6 supercharged 4-stroke outboards (135-300HP, 2005-2021) with 4.80" Bullet Torpedo Gearcase.*** Newer Verado V8, V10, V12 generations use different gearcases. Mercury Racing variants use different gearcases. Replace all seals concurrently for proper lower unit longevity.