GENUINE MERCURY MARINE / QUICKSILVER OEM PART
Mercury P/N: 72710
Part Description: COVER, GEAR HOUSING
Application: Mercury Lower Unit / Gear Housing
Condition: NEW OLD STOCK
Material: Metal
This listing is for ONE genuine Mercury Marine / Quicksilver OEM gear housing cover, part number 72710.
This is an original Mercury lower-unit / gearcase component used in the propeller-shaft gear housing assembly on compatible older Mercury outboards.
Mercury identifies P/N 72710 as:
COVER, GEAR HOUSING
The part is a metal ring-style cover with approximately 2.75" outside diameter and four internal drive notches.
Please compare the photographs and measurements with your existing part before purchasing.
Mercury Marine / Quicksilver P/N: 72710
Description: COVER, GEAR HOUSING
This is the original Mercury OEM number.
Mercury parts databases currently identify 72710 as no longer available (NLA).
The 72710 is a gear housing cover used in the lower unit / gearcase assembly.
It is installed in the propeller-shaft/gear-housing portion of compatible older Mercury outboards.
The four internal notches provide engagement for the appropriate service tool when installing or removing the cover.
This is NOT a propeller thrust washer, propeller hub, or generic retaining ring.
It is a specific Mercury lower-unit component.
Mercury parts diagrams identify P/N 72710 in the gear housing/propeller shaft assembly of older Mercury 20 HP / Mercury 200 20 outboards.
Documented serial-number applications include:
Mercury's parts diagrams specifically list 72710 as the COVER, GEAR HOUSING.
A current marine parts listing also identifies this part as a Quicksilver Gear Housing Cover 72710 for 1973–1980 Mercury 20 HP.
PLEASE VERIFY YOUR SERIAL NUMBER AND PART NUMBER BEFORE PURCHASING.
Older Mercury gearcases can use different covers and retaining components that may look very similar.
Do not purchase based solely on horsepower or year.
If your Mercury parts diagram calls for:
72710 — COVER, GEAR HOUSING
then this is the OEM part you are looking for.
Compare your original component with the photographs and approximately 2.75" outside diameter / four internal notches.
This is an older Mercury OEM component that has been discontinued / listed as NLA by Mercury parts sources.
That makes original new-old-stock examples particularly useful to owners restoring or rebuilding older Mercury lower units.
Finding an exact OEM gearcase component can be much more important to a restoration customer than finding the cheapest aftermarket replacement.
There are documented examples of Mercury owners actively searching for 72710 because their existing gear-housing cover was seized and they could not locate a replacement.
BRAND NEW / NEVER INSTALLED
This is a genuine Mercury Marine OEM part in original Mercury packaging.
The part has never been installed.
The original packaging may show minor signs of age or shelf storage, but the package and part are otherwise in very good condition.
The exact part shown in the photographs is the part you will receive.
This listing is for an original:
MERCURY MARINE / QUICKSILVER
OEM part.
It is not an aftermarket reproduction.
The original Mercury part number is clearly identified as:
72710
Current Mercury parts sources identify this part as COVER, GEAR HOUSING and list it as no longer available.
72710
Mercury 72710
Quicksilver 72710
Mercury Gear Housing Cover
Mercury Gearcase Cover
Mercury Lower Unit Cover
Mercury 20 HP Gearcase
Mercury 200 20
Mercury 20 Lower Unit
Mercury 20 HP Lower Unit
Mercury Propeller Shaft Gear Housing
Mercury Gear Housing
Mercury Gearcase Parts
Mercury Lower Unit Parts
Mercury 1970s Outboard
Vintage Mercury Outboard
Quicksilver Gear Housing Cover
NLA Mercury Part
NOS Mercury
OEM Mercury
1 × Genuine Mercury Marine / Quicksilver OEM Gear Housing Cover
P/N 72710
NEW / NEVER INSTALLED
Original Mercury packaging
Approximate physical measurements:
Outside Diameter: 2.75"
Internal Drive Notches: 4
Please verify fitment before purchasing.