WILLIAMS 520 SportJet
(Rotax ACE 1630 engine)
Technical guide, maintenance and spare parts
The Williams SportJet 520 described in this article is a sporty hydrojet tender equipped with the BRP Rotax ACE 1630 engine rated at 230 HP. This three-cylinder, four-stroke engine with a displacement of 1,630 cm³ is supercharged. At 5.19 metres long, with capacity for 7 people and a 100-litre fuel tank, this configuration is recommended for yachts of 30 metres and over. The stated top speed for this version is 90 km/h (56 mph).
At Rotax Tender Parts, we offer maintenance and replacement parts for the SportJet 520 and Rotax engines: filters, spark plugs, sensors, relays, fuel system components, seals and propulsion unit components. The supercharger must be taken into account during maintenance and diagnostics.
Find parts for your WILLIAMS SportJet 520 – Rotax 1630
- Engine parts
- Fuel system
- Ignition
- Sensors
- Electrical parts
- Cooling
- Oil and filters
- Seals and gaskets
- Jet unit parts
- Other
Technical specifications of the Williams SportJet 520 – Rotax 1630
- Overall length: 5.19 m.
- Beam: 2.01 m.
- Dry weight: 675 kg.
- Overall height: 1.42 m.
- Height with windscreen folded: 1.13 m.
- Engine: BRP Rotax ACE 1630, three-cylinder, four-stroke.
- Displacement: 1,630 cm³.
- Forced induction: Supercharger.
- Power: 230 HP.
- Propulsion: Hydrojet.
- Top speed: 90 km/h (56 mph).
- Capacity: 7 people.
- Fuel tank: 100 litres.
- Fuel: Petrol.
- Recommended yacht: 30 m and over.
- Category: SportJet.
Specifications may vary depending on the year of manufacture and equipment. To identify engine parts, check the Rotax ACE 1630 serial number and the 230 HP supercharged configuration.
Maintenance schedule – Williams SportJet 520 / Rotax 1630
An initial “break-in” service should be carried out between 10 and 25 hours: change the oil and oil filter, check the hoses and clamps, and perform a general inspection.
Thereafter, the Williams maintenance schedule is based primarily on three intervals: 50 hours or 1 year, 100 hours or 1 year, and then 200 hours or 2 years. For work directly related to the Rotax 1630 engine, also consult the applicable engine manual. A dash indicates that no operation is listed in the supplied table cell; it does not mean that maintenance is generally not required.
| Item | 50 h / 1 year | 100 h / 1 year | 200 h / 2 years |
|---|---|---|---|
| Supercharger | — | — | Service every 200 h |
| Engine oil and filter | Replace | Replace | — |
| Rubber engine mounts | Inspect | Inspect | — |
| Engine corrosion protection | Lubricate regularly* | Lubricate regularly* | — |
| PTO sleeve / seal | — | — | Replace** |
| Exhaust system | Inspect | Inspect / clean | — |
| Exhaust flushing | Clean regularly*** | Clean regularly*** | — |
| Cooling hoses and clamps | Inspect | Inspect | — |
| Coolant | Inspect | Inspect | Replace |
| Throttle body | Inspect | Inspect | — |
| Fuel system 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 bushings | Inspect | Inspect | — |
| Carbon ring / driveshaft bellows | Inspect | Inspect | — |
| Propulsion control and cables | Inspect | Inspect | — |
| Reverse bucket / rear gate | Lubricate | Lubricate | — |
| Jet / PTO shaft and splines | Inspect / lubricate | — | — |
| Shaft seal, sleeve and O-ring | Inspect | — | Replace |
| Jet unit and wear ring clearance | Inspect | Inspect | — |
| Sacrificial anode | Regular check**** | Regular check**** | Regular check**** |
| Intake grate / plate | Inspect | — | — |
* When used in salt water, apply corrosion protection to metal components in the engine compartment every 10 hours of operation.
** Replace the PTO sleeve and seal at 200 hours, regardless of the number of years.
*** Flush the exhaust system daily after use in salt water or dirty water.
**** Check the sacrificial anode every month, and every two weeks in salt water. Replace it as necessary.
Supercharger: schedule a service every 200 hours of operation. For the required procedures, consult the Rotax manual corresponding to the engine serial number.
Routine maintenance recommended by Williams
In addition to the periodic schedule, Williams recommends, in particular:
- washing the tender regularly with fresh water to remove salt deposits;
- checking the engine oil level;
- checking the coolant level;
- flushing the open cooling circuit;
- greasing the control cables at the console and propulsion unit ends;
- checking the bilge for water, oil or fuel;
- regularly checking the condition of the anodes;
- regularly checking the tube pressure.
After use in salt water
Flushing is particularly important after use at sea. In particular:
- rinse the tender with fresh water;
- carry out the engine-flushing procedure;
- rinse the jet unit and propulsion area;
- check the intake grate;
- check the condition of the anodes;
- inspect the engine compartment;
- check the electrical connections and look for signs of corrosion.
Intensive use or use in a tropical environment may require shorter maintenance intervals. Follow the procedure in your manual; also see our engine flushing guide.
Common parts for the WILLIAMS SportJet 520 – Rotax 1630
OEM part numbers identify the parts being replaced; they do not automatically indicate genuine parts. Click a “Buy” thumbnail to add one item to your cart and open the cart. If you need to select a version or pack, the “Choose version” thumbnail opens the product page. Names and part numbers link to their respective product pages.
Check each part number against the engine parts catalogue for your supercharged 1630, particularly 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; engine rebuild parts in the second table require specific verification against the installed engine configuration.
Common problems with the WILLIAMS SportJet 520 – Rotax 1630
The following symptoms can have several causes. These clues guide checks, without replacing a diagnosis or automatically justifying the replacement of a part. Work on fuel, electricity, supercharging, and moving parts must comply with the manual and be entrusted to a professional when necessary. (FMT)
- The engine does not start: battery, voltage during starting, battery disconnect, safety circuit breaker, 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, cooling, electronic limitation, or propulsion block may be at fault. On this supercharged 230 HP version, the diagnosis must also take into account the compressor and the supercharging circuit, 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 checks, consult our list of Williams and Rotax fault codes and our Rotax fault code guide. Stop the engine and prevent any restart before inspecting the water intake or the propulsion block.
How to identify the right part for your SportJet 520?
Send us a clear photo, the visible OEM reference, the model, the year, the HIN number, and the engine serial number. Specify the 230 HP Rotax ACE 1630 with compressor engine and the presence of the iNR option for the components concerned. Do not rely solely on the SportJet 520 designation.
Identify my part from a photo.
WILLIAMS SportJet 520 Rotax 1630: frequently asked questions - FAQ
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What engine equips the Williams SportJet 520?
The SportJet 520 of this generation is equipped with a BRP Rotax ACE 1630, a 1,630 cm³ four-stroke three-cylinder engine, supercharged by a compressor and developing 230 HP
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Does the SportJet 520 have the same Rotax 1630 as other Williams?
The Rotax 1630 has been used in different configurations and powers on several Williams Jet Tenders. The differences in power from one boat to another result from a computer (ECU / ECM) programming and different propulsion block. For this specific model, the engine is equipped with a compressor allowing it to reach 230 HP
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What is the maximum speed of the Williams SportJet 520?
Williams announces around 90 km/h (56 mph).. The actual speed may vary depending on the load, hull condition, navigation conditions, and propulsion condition.
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What is the weight of the SportJet 520?
Williams indicates a dry weight of 675 kg.
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How many people can the SportJet 520 carry?
The SportJet 520 is designed for 7 people..
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What is the tank capacity?
The SportJet 520 has a tank of around 100 liters.
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What fuel to use?
The SportJet 520 runs on Unleaded 98 or Unleaded 95 or 95-E10..
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Why does my Williams SportJet 520 not start?
The first elements to check are notably:
- battery and voltage during starting;
- battery disconnect ;
- safety circuit breaker ;
- 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 520 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 ;
- compressor problem ;
- cooling problem ;
- electronic limitation related 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.
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Why does my SportJet 520 overheat?
Overheating can be caused by, among other things, 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 before identifying the cause. See our article on engine overheating.
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Should the SportJet 520 be flushed after every trip at sea?
Yes. Rinsing with fresh water is particularly important after use in salt water. Williams recommends, in particular, 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 is complete without replacing it.
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What is the SportJet 520 carbon ring?
The carbon ring (or carbon ring, 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 malfunction in this system can, among other things, cause water to enter the engine compartment.
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Why is there water in the bilge of my SportJet 520?
A small amount of water can have different origins, but an abnormal accumulation must be investigated. In particular, you should check:
- the shaft sealing system (carbon ring, boot...);
- the sea water / coolant heat exchanger (Ride plate)
- hoses ;
- fittings ;
- exhaust system ;
- 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 520 cavitate when accelerating?
A sensation of cavitation or loss of thrust when accelerating can be related to, among other things, to:
- debris in the intake screen ;
- damaged propeller ;
- damaged propulsion block
- incorrect clearance between the impeller and its surroundings ;
- deterioration of propulsion block components (see our article on wear rings) ;
- air intake or disruption of the water flow.
You must inspect the propulsion system 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 520 Rotax 1630?
As with most Rotax engines, use an oil that meets the specifications recommended by BRP for this engine: XPS 4T 5W-40.
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What spark plugs should be used on the SportJet 520?
The recommended spark plugs are NGK DCPR8E. Our compatible spark plugs DCPR8E compatible spark plug are perfectly suited for the Williams 520 Sport with a 1503 or 1630 engine.
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How to identify the right fuel pump, relay, or sensor?
Do not rely solely on the "SportJet 520" designation. To correctly identify a part, use if possible:
- tender year ;
- HIN number ;
- engine serial number ;
- reference number printed on the original part ;
- a photo of the part.
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Where can I find parts for a Williams SportJet 520 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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