Quicksilver 10-79953Q04 Screw Kit

Quicksilver 10-79953Q04 Screw Kit

Quicksilver 79953Q04 Lower Unit Gear Lube Drain & Fill Hole Screw and Seal is a replacement drain/fill screw assembly designed for MerCruiser sterndrives and most Mercury and Mariner outboards equipped with 3/8-16 non-magnetic gear lube fill or vent screws. This non-magnetic screw and seal help maintain a secure seal in the lower unit, preventing gear lube leaks and protecting the gearcase from water intrusion.

Using the correct drain/fill screw and seal is essential during routine gear lube service. The included seal ensures the screw seats properly, helping retain lubricant while preventing water from entering the gearcase, which can lead to costly internal damage.

Product Features:

• Replacement lower unit gear lube drain and fill hole screw with seal
• Fits 3/8-16 non-magnetic drain/fill screw applications
• Designed for MerCruiser sterndrives and most Mercury and Mariner outboards
• Helps create a proper seal to prevent gear lube leaks
• Keeps water from entering the gearcase and causing internal damage
• Non-magnetic screw design
• Ideal for routine lower unit maintenance and gear lube service

Fits:

• MerCruiser I, R, MR, Alpha One, TR, TRS
• Mercury outboards with 3/8-16 non-magnetic gear lube fill or vent screws
• Mariner outboards with 3/8-16 non-magnetic gear lube fill or vent screws

Does Not Fit:

• Mercury Verado outboards

Kit Includes:

• Non-magnetic drain/fill hole screw
• Drain/fill hole screw seal

Product Details:

• Brand: Quicksilver
• Manufacturer Part Number: 79953Q04
• Part Type: Lower Unit Gear Lube Drain & Fill Hole Screw and Seal

Supersedes from 10-79953q-2

Frequently Asked Questions

What is the Quicksilver 10-79953Q04 Screw Kit used for?

The Quicksilver 10-79953Q04 Screw Kit is a replacement lower unit gear lube drain and fill hole screw assembly with a seal. It is designed for MerCruiser sterndrives and most Mercury and Mariner outboards using 3/8-16 non-magnetic gear lube fill or vent screws during routine gear lube service.

What applications does the Quicksilver 10-79953Q04 Screw Kit fit?

The kit fits MerCruiser I, R, MR, Alpha One, TR, and TRS sterndrives, along with Mercury and Mariner outboards equipped with 3/8-16 non-magnetic gear lube fill or vent screws. The description specifically states that this kit does not fit Mercury Verado outboards.

What does the seal included with the Quicksilver 10-79953Q04 Screw Kit do?

The included drain/fill hole screw seal helps the screw seat properly and create a secure seal. This helps prevent gear lube leaks while keeping water from entering the gearcase during routine lower unit gear lube service.

Is the screw in the Quicksilver 10-79953Q04 Screw Kit magnetic?

No. The Quicksilver 10-79953Q04 Screw Kit includes a non-magnetic drain/fill hole screw. It is intended for applications using 3/8-16 non-magnetic gear lube fill or vent screws on compatible MerCruiser, Mercury, and Mariner equipment.

What is included in the Quicksilver 10-79953Q04 Screw Kit?

The kit includes one non-magnetic drain/fill hole screw and one drain/fill hole screw seal. Together, these components provide the replacement screw and sealing components specified for compatible lower unit gear lube drain and fill applications.

What should I verify before using the Quicksilver 10-79953Q04 Screw Kit?

Verify that your equipment uses a 3/8-16 non-magnetic gear lube fill or vent screw and confirm that the application is a compatible MerCruiser, Mercury, or Mariner model listed in the product description. Mercury Verado outboards are specifically excluded from compatibility.

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