12191833 Mercury MerCruiser Seal Blue | Genuine Quicksilver OEM Part

🔧 Product Description

Genuine Quicksilver Blue Gear Lube Drain / Fill Screw Seal - Part Number: 12-19183-3

A genuine Quicksilver blue seal used on Mercury, Mariner and MerCruiser gear lube drain and fill screws. This seal fits under the 3/8"-16 gearcase or sterndrive drain / vent plug and helps prevent gear oil leakage and water intrusion during lower unit or sterndrive operation.

⚙️ Key Features

• Genuine Quicksilver OEM blue gear lube seal
• Correct Mercury part number 12-19183-3
• Used with 3/8"-16 Mercury drain / fill / vent screws
• Common service replacement during gear oil changes
• Supersession-linked to current Mercury service reference 12-8M0187157

🚤 Compatibility

Commonly used on

• Mercury / Mariner lower-unit drain and vent screw applications
• MerCruiser upper and lower sterndrive gear lube drain / fill screw applications
• Mercury sea-water pump assemblies where washer 12-19183-3 / 12-8M0187157 is specified

Typically suits

• Engine / drive models:
• MerCruiser Alpha One stern drive drain / fill screw applications
• MerCruiser Alpha One Gen II stern drive drain / fill screw applications
• MerCruiser Bravo One stern drive drain / fill screw applications
• MerCruiser Bravo Two stern drive drain / fill screw applications
• MerCruiser Bravo Three stern drive drain / fill screw applications
• MerCruiser Bravo XR / X drive drain / fill screw applications where 12-19183-3 or 12-8M0187157 is specified
• MerCruiser sea-water pump assembly - serial 0L000768 to 0L001772 where washer / seal 12-8M0187157 is specified
• Mercury 7.5HP outboard gear housing assembly - serial 2529895 to 3274632
• Mercury 40HP 4-cylinder gear housing - serial 0C159200 and up
• Mercury 75HP / 80HP / 90HP / 100HP / 115HP gear housing applications where the 3/8"-16 drain / vent screw uses 12-19183-3
• Mercury 115 EFI 4-stroke gear housing - serial 0T178500 to 0T800999 where 12-19183-3 is shown
• Mercury V-200 gear housing - serial 0G303046 to 0G760299
• Mercury 225 DFI gear housing - serial 0G760300 to 0G960499
• Mercury 850 85HP 4-cylinder gear housing - Australian serial 8043775 to 8050199
• Mercury / Mariner outboards using Mercury 3/8"-16 grease filler and vent hole screws
• HP Range: commonly 6HP - 225HP+ Mercury / Mariner outboards, plus MerCruiser sterndrive applications
• Engine / Drive Type: Mercury / Mariner outboard gearcase and MerCruiser sterndrive gear housing sealing hardware
• System Type: Gear lube drain / fill / vent screw seal

🔌 Function

This blue seal sits under the drain, fill or vent screw to seal the gearcase or sterndrive housing. It helps keep gear lube inside the housing and prevents water from entering through the plug thread area.

⚠️ Common Signs of Failure

• Gear oil leaking around the drain or vent screw
• Milky gear oil caused by water intrusion
• Flattened, split or missing screw seal
• Seal crushed after repeated gear oil services
• Water pressure or vacuum test failure at the drain / fill screw

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 12-8M0187157 → Supersedes 12-19183-3
• 12-19183-3 → Supersedes 12-19183-2
• 12-19183-2 → Supersedes 12-19183
• 12-19183 earlier OEM reference

OEM / Related Numbers

• 12-19183-3
• 12-191833
• 191833
• 12191833
• 12-19183-2
• 12-191832
• 191832
• 12-19183
• 19183
• 12-20260
• 12-8M0187157
• 8M0187157
• 128M0187157

Aftermarket / Verified Equivalents

• Sierra: 18-2945
• Sierra: 18-2244
• Sierra: 18-2945-9
• Mallory: 9-60101
• Mallory: 9-60102
• Chrysler / Force: F50556
• Chrysler / Force: F8077
• Chrysler / Force: F8186
• OMC / Johnson / Evinrude: 0307552
• GLM-style replacement: 27217 / 2717-8001 cross-reference family

📦 Condition

• Genuine Quicksilver part
• Brand new
• Supplied in original or equivalent packaging