Water Pump Base / Oil Seal Housing for Yamaha Outboards

Premium-quality aftermarket water pump base housing / oil seal housing for selected Yamaha 40 HP, 50 HP and 60 HP outboard engines.

Suitable for selected 2-stroke and 4-stroke Yamaha models using part number 63D-44341-00.

This housing is fitted in the lower unit directly below the main water pump assembly and houses the driveshaft oil seals. Yamaha parts diagrams identify 63D-44341-00 as HOUSING, WATER PUMP.

Fits Yamaha Outboards

2 Stroke

40 HP

40V – selected 1997 onwards models
40Y – selected 2004–2007 models

50 HP

50H – selected applications

Yamaha's 2005 40V parts catalogue specifically shows 63D-44341-00 in the lower casing/water-pump assembly.

4 Stroke

40 HP

F40A
F40D
Selected other F40 applications using 63D-44341-00

50 HP

F50A
F50F
Selected other F50 applications using 63D-44341-00

60 HP

F60A
F60C
Selected other F60 applications using 63D-44341-00

For example, Yamaha's F40D catalogue and F60A catalogue both explicitly list 63D-44341-00 as the water-pump housing.

Replaces Yamaha Part Numbers

63D-44341-00
63D-44341-00-00
63D4434100
63D443410000

OEM part numbers are used for identification and reference purposes only.

Product Features

Water pump base housing
Water pump lower housing
Oil seal housing
Driveshaft oil seal housing
Fits selected Yamaha outboards
40 HP
50 HP
60 HP
Selected 2 Stroke applications
Selected 4 Stroke applications
Replacement for 63D-44341-00
Marine-grade aftermarket part
Manufactured to OEM specifications
New replacement part
UK stock

Important – Housing Only

This listing is for the:

WATER PUMP BASE / OIL SEAL HOUSING

Please check the product contents shown in the pictures.

Depending on the product you are supplying, oil seals and O-ring may not be included. Yamaha diagrams show the housing, oil seals, O-ring and oil-seal cover as separate components.

Important – Please Check Compatibility

Please do not order by horsepower or appearance alone.

Yamaha used different lower-unit and water-pump configurations across 40 HP, 50 HP and 60 HP engines.

Before purchasing, please check:

Exact engine model
2 Stroke or 4 Stroke
Production year
Engine serial number
Existing housing
Original Yamaha part number

For the safest identification, check that your engine requires:

63D-44341-00

If the part looks the same as yours, this does not always mean it is the correct one for your outboard.

If you are unsure, please send us your engine model and serial number and our technical team will be happy to check compatibility.

Why Buy From SSI Marine?

Marine-grade aftermarket & OEM-spec parts
Workshop-tested products
More than 10 years supplying outboard parts
UK stock
Same working day dispatch before 1 PM Monday–Friday
Royal Mail Tracked 24
Technical support from experienced outboard specialists
Collection available from Leigh, Greater Manchester
Workshop open Monday–Friday, 9 AM–5 PM

Yamaha Outboard 40 HP 50 HP 60 HP Water Pump Base Oil Seal Housing 63D-44341-00