GENUINE MERCURY MARINE OEM BEARING CARRIER NUT / GEAR HOUSING COVER
Mercury Part Number: 52699
Also Referenced As: 31037
Type: Bearing Carrier Nut / Gear Housing Cover
Design: 12-Tooth Internal Retainer
Condition: NEW OLD STOCK
This is a genuine Mercury Marine OEM bearing carrier nut / gear housing cover, part number 52699.
This is the smaller 12-tooth Mercury retainer used on a variety of older Mercury and Mariner outboard lower units.
The part has 12 internal teeth and is designed to be installed and removed using the appropriate Mercury-style retaining-ring/spanner tool.
This is NOT a propeller hub.
It is a lower-unit / gearcase bearing carrier retaining component.
Mercury P/N: 52699
Cross-reference / earlier number: 31037
Some current Mercury parts catalogs identify this component as:
NUT — BEARING CARRIER
It may also be described in parts diagrams and aftermarket catalogs as:
Please verify 52699 against your existing part or OEM parts diagram before purchasing.
The 52699 is installed in the gear housing/lower unit and retains the bearing carrier assembly.
The internal teeth allow a special spanner-type tool to engage the retainer for removal and installation.
This is a service component used during lower-unit/gearcase repair.
12 INTERNAL TEETH
Approximate outside diameter: 85 mm / 3.35 inches
Please use the photographs and measurements to confirm that this is the correct retainer for your application.
Mercury parts information shows P/N 52699 used across a wide range of older Mercury and Mariner outboard gearcases.
Known applications include select:
MERCURY / MARINER OUTBOARDS
Documented model/serial-number applications span approximately the 1970s through the mid-1990s, depending on engine and gearcase configuration.
Examples include older Mercury and Mariner:
Current Mercury parts listings show 52699 on multiple gearcase diagrams, including older Mercury 850, 950 and other outboard applications.
This is an older gearcase-specific part.
The correct retainer depends on the exact lower-unit design.
Do not purchase based solely on horsepower or year.
Please compare:
P/N 52699
with your existing retainer, parts diagram, engine model and serial number before ordering.
The fact that both 52699 and other Mercury retainers use 12 teeth does not mean they are interchangeable. The outside diameter and dimensions are different.
If you have seen Mercury retainer 79448, do not assume it is interchangeable with this part.
52699 is the smaller retainer.
A specialty retaining-ring tool listing specifically identifies 52699 as an approximately 85-mm OD, 12-tooth Mercury retainer, which is different from the larger retaining rings used on later/high-horsepower gearcases.
If replacing an existing retainer, match the original part number and dimensions.
BRAND NEW / NEVER INSTALLED
This is an original Mercury Marine OEM part that has been in inventory/storage.
The original retail price associated with this piece was $15.63.
The part has never been installed.
Because this is older OEM inventory, it may show minor cosmetic signs of storage or age such as surface discoloration, light scratches or shelf wear.
These are normal characteristics of old-stock marine parts and do not indicate previous use.
Please examine all photographs carefully. The exact part shown is the part you will receive.
There are aftermarket replacements available for this style of Mercury lower-unit retainer.
This listing is for the original Mercury Marine OEM 52699.
For someone rebuilding an older Mercury or Mariner gearcase, matching the original OEM part number can be preferable to guessing whether an aftermarket replacement has the correct dimensions.
Current genuine Mercury dealer listings still show P/N 52699 at approximately $30.90, making this an active replacement part rather than simply obsolete scrap inventory.
52699
Mercury 52699
Quicksilver 52699
Mercury 31037
31037
Mercury Bearing Carrier Nut
Mercury Bearing Carrier Retainer
Mercury Gear Housing Cover
Mercury Gearcase Retainer
Mercury Lower Unit Retainer
Mercury Spanner Nut
Mercury 12 Tooth Retainer
Mariner 52699
Mercury 85mm Retainer
Sierra 18-3750
1 Genuine Mercury Marine Bearing Carrier Nut / Gear Housing Retainer
P/N 52699
12 internal teeth
Approximately 85 mm outside diameter
NEW OLD STOCK / NEVER INSTALLED
Original retail price was approximately $15.63.
Please verify the part number and dimensions against your application before ordering.
Ships carefully packaged to protect the part during transit.