WILLIAMS 460 SportJet
(Rotax ACE 1630 Engine)
Technical Guide, Maintenance and Spare Parts
The current Williams SportJet 460 is a jet-propelled sport tender equipped with the BRP Rotax ACE 1630 170 HP engine. This 1,630 cc four-stroke three-cylinder engine is naturally aspirated, without a compressor. With its 4.59 meters in length, its capacity for 6 people and its 100-liter fuel tank, it combines boating comfort, performance, and suitability for water sports. This configuration is designed for yachts of 25 meters and larger. The indicated top speed reaches 77 km/h (48 mph).
At Rotax Tender Parts, we offer maintenance and replacement parts for the SportJet 460 and Rotax engines: filters, spark plugs, sensors, relays, fuel systems, seals, and propulsion block components. As this version of the 460 is not supercharged, it does not have a compressor.
Find Parts for Your WILLIAMS SportJet 460 – Rotax 1630
- Engine parts
- Fuel system
- Ignition
- Sensors
- Electrical parts
- Cooling
- Oil and filters
- Seals and gaskets
- Turbine block parts
- Other
Technical Specifications of the Williams SportJet 460 – Rotax ACE 1630
- Overall length: 4.59 m.
- Width: 2.01 m.
- Dry weight: 625 kg.
- Overall height: 1.42 m.
- Height with folded windshield: 1.13 m.
- Engine: BRP Rotax ACE 1630, three-cylinder, four-stroke.
- Displacement: 1,630 cc.
- Induction: naturally aspirated, without a compressor.
- Power: 170 HP.
- Propulsion: jet.
- Capacity: 6 people.
- Fuel tank: 100 liters.
- Maximum speed: up to 77 km/h (48 mph).
- Recommended yacht: 25 m and larger.
- CE category: C.
- iDF (Intelligent Debris Free): system allowing the pilot to remotely clear certain debris from the propulsion block intake.
Specifications may vary depending on the year of manufacture and equipment. For engine part identification, check the serial number of the Rotax ACE 1630 and the 170 HP naturally aspirated configuration.
Maintenance Schedule – Williams SportJet 460 / Rotax 1630
An initial revision, known as the "break-in service," should be performed between 10 and 25 hours: drain and replace the oil filter, check the hoses and clamps, and perform a general inspection.
Next, the Williams maintenance program is based mainly on three intervals: 50 hours or 1 year, 100 hours or 1 year, then 200 hours or 2 years. For operations directly related to the Rotax 1630 engine, also consult the corresponding engine manual. A dash indicates that no operation is specified in the table cell, not a general exemption from maintenance.
| Item | 50 h / 1 year | 100 h / 1 year | 200 h / 2 years |
|---|---|---|---|
| Engine oil and filter | Replace | Replace | — |
| Rubber engine mounts | Inspect | Inspect | — |
| Engine anti-corrosion protection | Lubricate regularly* | Lubricate regularly* | — |
| Drive shaft sleeve / power take-off seal | — | — | Replace** |
| Exhaust system | Inspect | Inspect / clean | — |
| Exhaust flush | Clean regularly*** | Clean regularly*** | — |
| Cooling hoses and fittings | Inspect | Inspect | — |
| Coolant | Inspect | Inspect | Replace |
| Throttle body | Inspect | Inspect | — |
| Fuel circuit and lines | Inspect | Inspect | — |
| Engine fault codes | Inspect | Inspect | — |
| Air filter | Inspect / replace if necessary | — | — |
| Spark plugs | Inspect | Inspect | Replace |
| Ignition coils | Inspect | Inspect | Inspect |
| Electrical connections | Inspect | Inspect | Inspect |
| Engine stop switch | Inspect | Inspect | Inspect |
| Steering cable and connection | Inspect | Inspect | — |
| Steering nozzle rings | Inspect | Inspect | — |
| Carbon ring / shaft boot | Inspect | Inspect | — |
| Propulsion control and cables | Inspect | Inspect | — |
| Reverse bucket / rear door | Lubricate | Lubricate | — |
| Turbine and PTO shaft / splines | Inspect / lubricate | — | — |
| Shaft seal, sleeve and O-ring | Inspect | — | Replace |
| Turbine and wear ring set | Inspect | Inspect | — |
| Sacrificial anode | Check regularly**** | Check regularly**** | Check regularly**** |
| Intake screen / plate | Inspect | — | — |
* When used in salt water, protect the metal components of the engine compartment every 10 hours of use.
** The power take-off sleeve and seal must be replaced at 200 hours, regardless of the number of years.
*** The exhaust system must be flushed daily after use in salt water or dirty water.
**** The sacrificial anode must be checked every month, and every two weeks in salt water. It must be replaced when necessary.
Routine maintenance recommended by Williams
In addition to the periodic schedule, Williams recommends:
- regularly washing the tender with fresh water to remove salt deposits;
- checking the engine oil level;
- checking the coolant level;
- flushing the open cooling system;
- greasing the control cables on the console side and the propulsion block side;
- checking for water, oil, or fuel in the bilge;
- regularly checking the condition of the anodes;
- regularly checking the pressure of the bellows.
After use in salt water
After use at sea, flushing is particularly important. In particular, you should:
- rinse the tender with fresh water;
- perform the engine flush procedure;
- rinse the turbine block and the propulsion area;
- check the intake screen;
- check the condition of the anodes;
- inspect the engine compartment;
- monitor electrical connections and any signs of corrosion.
Intensive use or use in a tropical environment may require more frequent maintenance intervals. Follow the procedure in your manual; also consult our engine flush guide.
Common parts for the WILLIAMS SportJet 460 – Rotax 1630
OEM part numbers identify the replaced parts; they do not automatically refer to original parts. Click on a "Buy" thumbnail to add one unit of the product to the cart and access the cart. If the version or batch requires a choice, the "Choose the version" thumbnail opens the product page. The names and part numbers retain their links to the product pages.
Check each part number against the engine catalog of your naturally aspirated 1630, especially for seals, valves, the stator, and internal parts. Do not substitute a 1503 part for a 1630 part based solely on the tender model name. iNR components apply only to tenders equipped with this option; the engine rebuild parts in the second table require specific validation for the installed engine configuration.
| Buy | Part | OEM Reference | Function |
|---|---|---|---|
 |
1503 4-TEC Cylinder Head Gasket | 420641110 / 420950770 | Block sealing. |
 |
Valve Cover Gasket | 290950820 / 420950820 | Valve cover sealing. |
 |
4-TEC Timing Chain | 420898042 | Timing synchronization. |
 |
1503 Oil Pump Bellows | 420832648 | Shaft seal (transmission) |
 |
1503 Connecting Rod Bearing Kit | Unspecified | Lower engine rebuild. |
 |
1503 Intake / Exhaust Valve | 420254682 ; 420254293 / 420254298 | Targeted replacement; compare intake or exhaust, dimensions, lobes, and keys. |
 |
1503 Valve Stem Seals | 420630200 / 420630202 | Sealing around the valves; set of 6 or 12 depending on the variant. |
 |
1503 4-TEC Magneto Stator | 420889721 / 420889720 / 290889720 | Electrical generation. |
 |
1503 Complete Engine Gasket Kit | Unspecified | Gasket set for an engine rebuild |
 |
4-TEC Forged Connecting Rod | 420917516 | Piston stroke transmission. |
 |
Connecting Rod and Crankshaft Bearings | 420933456 / 420933466 / 420933523 | Lower engine rebuild. |
 |
Intake Air Temperature Sensor | 420222427 / 420222423 | Air temperature measurement. |
Common Problems with the WILLIAMS SportJet 460 – Rotax 1630
The following symptoms may have several causes. These clues help guide checks without replacing a diagnosis or automatically justifying the replacement of a part. Work on fuel, electrical systems, and moving parts must comply with the manual and be entrusted to a professional when necessary. (FMT)
- The engine does not start: battery, cranking voltage, battery disconnect, safety kill switch, fuses, relays, fuel supply, spark plugs, coils, injectors, or sensors may be affected.
- Engine misfires: methodically check the ignition, fuel supply, sensors, wiring, and compression before replacing a part.
- Lack of power: injection, ignition, air intake, cooling, electronic limitation, or propulsion block may be to blame. This 170 HP version is naturally aspirated and does not feature a compressor. A clogged water intake, damaged turbine, or excessive play can also reduce thrust.
- Fault code display: the code identifies a detected anomaly, but does not prove on its own that a part must be replaced.
To guide your checks, consult our list of Williams and Rotax fault codes and our Rotax fault code guide. Stop the engine and prevent it from restarting before inspecting the water intake or propulsion block.
How to identify the right part for your SportJet 460?
Send us a clear photo, the visible OEM reference, the model, the year, the HIN number, and the engine serial number. Specify the 170 HP naturally aspirated Rotax ACE 1630 engine and the presence of the iNR option for the components concerned. Do not rely solely on the SportJet 460 designation.
Identify my part from a photo.
WILLIAMS SportJet 460 Rotax 1630: Frequently Asked Questions - FAQ
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What engine is fitted in the Williams SportJet 460?
The SportJet 460 of this generation is equipped with a BRP Rotax ACE 1630, a 1,630 cm³ four-stroke three-cylinder engine, without a compressor, producing 170 HP. Do you have a previous generation? See our guide to the Williams SportJet 460 equipped with the Rotax 1503.
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Does the SportJet 460 have the same Rotax 1630 as other Williams?
The Rotax 1630 has been used in different configurations and power ratings on several Williams Jet Tenders. The differences in power from one boat to another result from ECU / ECM programming, the addition of a compressor, and/or different propulsion blocks.
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What is the maximum speed of the Williams SportJet 460?
Williams states approximately 77 km/h (48 mph).. The actual speed may vary depending on the load, hull condition, operating conditions, and propulsion condition.
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What is the weight of the SportJet 460?
Williams states a dry weight of 625 kg.
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How many people can the SportJet 460 carry?
The SportJet 460 is designed for 6 people..
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What is the tank capacity?
The SportJet 460 has a tank of approximately 100 liters.
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What fuel should I use?
The SportJet 460 runs on 98 Unleaded or 95 Unleaded or 95-E10..
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Why won't my Williams SportJet 460 start?
The first elements to check include:
- battery and cranking voltage;
- battery disconnect;
- safety kill switch;
- fuses and relays;
- fuel pump;
- fuel pressure;
- spark plugs;
- ignition coils;
- injectors;
- engine sensors;
- fault codes stored by the ECU.
Electronic diagnostics can prevent the unnecessary replacement of several components. (FMT)
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Why does my WILLIAMS 460 start but lack power?
Power loss can be related to the engine or the propulsion system. The main possibilities are:
- spark plugs or coils;
- fuel supply;
- injectors;
- engine sensor;
- cooling problem;
- electronic limitation due to a fault;
- blocked water intake;
- damaged impeller;
- excessive play in the propulsion system.
It is important to inspect the propulsion block before concluding that there is an engine problem. Turn off the engine and prevent it from restarting before this inspection.
-
Why does my SportJet 460 overheat?
Overheating can be caused by:
- a blockage in the water circuit;
- a blocked water intake;
- improper flushing;
- a damaged or clogged hose;
- a cooling problem;
- a faulty temperature sensor.
If a temperature alarm appears, avoid continuing to use the engine until you have identified the cause. See our article on engine overheating.
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Should the SportJet 460 be flushed after every trip at sea?
Yes. Flushing with fresh water is particularly important after use in salt water. Williams recommends flushing the open cooling circuit and regularly cleaning the tender to remove salt deposits. Follow the applicable procedure in the manual; our engine flushing guide provides the complete procedure.
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What is the SportJet 460 carbon ring?
The carbon ring (or carbon seal, or carbon ring) is part of the transmission shaft sealing system. Its condition and that of the rubber boot must be monitored. Williams recommends a professional inspection every 100 hours or before the season. A fault in this system can cause water to enter the engine compartment.
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Why is there water in the bilge of my SportJet 460?
A small amount of water can have different origins, but an abnormal accumulation must be investigated. You should check:
- the shaft sealing system (carbon ring, boot...);
- the sea water / coolant heat exchanger (Ride plate)
- hoses;
- fittings;
- the exhaust system;
- the bilge pump
- a hole or crack in the hull.
The presence of water must be diagnosed quickly if it reappears after each use.
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Why does my SportJet 460 cavitate when accelerating?
A sensation of cavitation or loss of thrust when accelerating can be related to:
- debris in the intake screen;
- a damaged propeller;
- a damaged propulsion block
- incorrect clearance between the impeller and its surroundings;
- deterioration of propulsion block components (see our article on wear rings);
- an air leak or disruption of the water flow.
The propulsion system should be inspected before looking for an engine failure. Turn off the engine and prevent it from restarting before inspecting the screen and the turbine block.
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What oil should be used in the SportJet 460 Rotax 1630?
As with most Rotax engines, use oil that meets the specifications recommended by BRP for this engine: XPS 4T 5W-40.
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Which spark plugs should be used on the SportJet 460?
The recommended spark plugs are NGK DCPR8E. Our compatible DCPR8E compatible spark plug is perfectly suited for the Williams 460 Sport with a 1503 or 1630 engine.
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How to identify the correct fuel pump, relay, or sensor?
Do not rely solely on the "SportJet 460" designation. To correctly identify a part, use whenever possible:
- the tender year;
- the HIN number;
- the engine serial number;
- the part number stamped on the original part;
- a photo of the part.
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Where can I find parts for a Williams SportJet 460 Rotax 1630?
Rotax Tender Parts offers engine parts and components for Rotax 1630 engines, notably used on Williams Jet Tenders. Find the selection in the tables in this article and consult our Rotax parts catalog. .
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