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Sea-Doo & Williams Water Pump Seal Kit – 420650370 / 420950840 / 420650310

€40,00 EUR

Package 420650370 - water seal 420650310 - oil seal 420950840 - ring Complete 3-piece set

Ships within 1 to 2 days for available items.

Free shipping to France and Europe - DDP for the USA*

Free returns.

Unsure about OEM compatibility? Use our tool: Find my part and our Technical Resources.

* Batteries not included

In stock

Description

This water pump seal kit, OEM part numbers 420650370 / 420950840 / 420650310, allows you to replace the relevant sealing elements during a water pump overhaul or repair. It is available for the Sea-Doo 4-TEC and Williams boats listed below, with Rotax 1503 and Rotax 1630 engines, depending on the configuration and original part numbers. Choose the mechanical seal, oil seal, O-ring, or the set of all three elements depending on the desired variant.

Technical Specifications

OEM part numbers: 420650370, 420950840 and 420650310
Rotating mechanical seal: 420650370
Water pump housing O-ring: 420950840, also listed as 290950840
Oil seal: 420650310, former part number 711650310
Type: water pump seals
Condition: New
Packaging: one seal individually or a set of all three seals, depending on the variant selected; pump, shaft and cover not included in this seal set
Weight: not specified by variant
Regulated substances: information not provided
Installation: check the part numbers and configuration, follow the workshop procedure and use the appropriate tools for installing the mechanical seal; check the condition of the mating surfaces and the sealing after installation

Sea-Doo Jet Ski Compatibility

Models equipped with the Rotax 1503 (4-TEC)

2002 to 2015 – GTX / GTX Limited (155, 215, 255, 260 hp)
2006 to 2019 – GTI / GTI SE (130, 155 hp): some base versions retained the 1503 after 2016
2004 to 2015 – RXP / RXP-X (215, 255, 260 hp)
2005 to 2015 – RXT / RXT-X (215, 255, 260 hp)
2004 to 2015 – Wake / Wake Pro (155, 215 hp)
2012 to 2016 – GTR (215 hp)

Models equipped with the Rotax 1630 ACE

2016 to present – RXP-X (300, 325 hp)
2016 to present – RXT-X (300, 325 hp)
2016 to present – GTX / GTX Limited (170, 230, 300 hp)
2017 to present – GTR / GTR-X (230, 300 hp)
2016 to present – Wake Pro (230 hp)
2020 to present – GTI / GTI SE (130, 170 hp)
2019 to present – FishPro (Sport / Trophy / Scout) (130, 170 hp)
2023 to present – Explorer Pro (170, 230 hp)

Williams Boat Compatibility

Williams 400 Sportjet (Rotax 1503)
Williams 435 Sportjet (Rotax 1503)
Williams 435 Sportjet (Rotax 1630)
Williams 460 Sportjet (Rotax 1503)
Williams 460 Sportjet (Rotax 1630)
Williams 520 Sportjet (Rotax 1503)
Williams 520 Sportjet (Rotax 1630)

⚠️ Always check your serial number (VIN) and the original OEM part number before ordering to confirm exact compatibility with your model.

Why Replace Water Pump Seals?

Wear of the water pump sealing elements can cause leaks and compromise the proper operation of the cooling system. A diagnosis allows you to identify the affected seal and check the condition of the pump before replacement.

Coolant or oil leak identified at the pump
O-ring cut, flattened or deteriorated
Mechanical seal or oil seal damaged during disassembly
Leak traces requiring inspection of the seals and mating surfaces

Inspect the sealing during maintenance and before seasonal commissioning. During work on the water pump, check the support surfaces and replace the seals according to their condition and the recommendations of the workshop procedure. Check for leaks after reassembly.