Service parts for the 90A FOUR
Grouped by system, with how many of each the parts manual calls for.
Air intake
1 requiredFuel system
1 requiredOil system
1 requiredBelts
1 requiredCooling system
1 requiredPrices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.
Specifications
Ratings spec sheet not in our library yet — see the documents below.
Maintenance & consumables
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Air Intake Heater | 43502-003 | Amazon eBay | ||
| Fuel filter | Fuel Filter | 100-068 | Amazon eBay | ||
| Oil filter | Oil Filter | 100-052 | Amazon eBay | ||
| Battery | — | 2500 hr | |||
| Belt | Belt | 100-080 | Amazon eBay | ||
| Coolant | — | 500 hr | |||
| Coolant filter | Coolant Filter | 100-074 | Amazon eBay eBay $27.69 KuduParts $233.99 | ||
| Oil | — | 100 hr | |||
| Spark plug | — | 250 hr |
Common questions
What oil filter fits the Westerbeke 90A FOUR?
The Westerbeke 90A FOUR uses oil filter part number 100-052.
What fuel filter fits the Westerbeke 90A FOUR?
The Westerbeke 90A FOUR uses fuel filter part number 100-068.
Which air filter part number does the Westerbeke 90A FOUR take?
The Westerbeke 90A FOUR uses air filter part number 43502-003.
Troubleshooting
4Symptoms & remedies
| Symptom | Cause | Remedy |
|---|---|---|
| No panel indications; fuel solenoid or fuel pump is not working (key switch is on and PREHEAT button is depressed). | Battery switch not on. 20-amp circuit breaker tripped. 10-amp breaker tripped on preheat solenoid. Loose battery connections. Preheat solenoid not operating. | Check switch and/or battery connections. Reset breaker, if breaker trips again, check preheat solenoid circuit and check circuit for shorts to ground. Check the voltage both at and after the breaker on the preheat solenoid. Check ( +) connection to starter solenoid and (-) connection to engine ground stud. Check battery cable connections. |
| START button is depressed, no starter engagement. | Connection to solenoid faulty. Gear shift not in neutral. Faulty switch. Faulty solenoid. Loose battery connections. Low battery. | Check connection. Gear shift must be in neutral (see NEUTRAL SWITCH under HURTH HSW TRANSMISSIONS). Check switch with ohmmeter. Check that 12 volts are present at the solenoid connection. Check battery connections. Check battery charge state. |
| Engine cranks, but does not start, fuel solenoid energized. | Faulty fueling system. Check that fuel valves are open. Check for air in fuel system. Bleed air from fuel system. Fuel filters clogged. Replace filters and bleed air from fuel system. Preheat solenoid faulty. Low battery power. | Check that fuel valves are open. Check for air in fuel system. Bleed air from fuel system. Fuel filters clogged. Replace filters and bleed air from fuel system. Check preheat solenoid. Switch to combine house and start batteries. Replace batteries. |
| Engine can't be stopped. | Faulty DC alternator. Fuel run solenoid will not de-energize. | Remove Exe. connection at alternator, repair alternator. Manually disconnect the |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Parts
16| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 100-046 | Air Filter | 1 | Air filter | Amazon eBay |
| 100-052 | Oil Filter | 1 | Oil filter | Amazon eBay |
| 100-068 | Fuel Filter | 1 | Fuel filter | Amazon eBay |
| 100-074 | Coolant Filter | 1 | Coolant filter | Amazon eBay eBay $27.69 KuduParts $233.99 |
| 100-080 | Belt | 1 | Belt | Amazon eBay |
| 100-096 | Spark Plug | 1 | Air filter | Amazon eBay KuduParts $136.99 |
| 14-0258-000 | Thermostat | 1 | Thermostat | Amazon eBay |
| 14-0259-000 | Raw water intake strainer | 1 | Strainer | Amazon eBay |
| 14-0367-000 | Air Filter | 1 | Air filter | Amazon eBay |
| 14-0368-000 | Zinc anode, raw water cooling circuit | 2 | Zinc anode | Amazon eBay |
| 14-0369-000 | Circulating pump, raw water | 1 | Pump | Amazon eBay |
| 43502-003 | Air Intake Heater | 1 | Air filter | Amazon eBay |
| 43502-001 | DC Breaker | 1 | Service part / kit | Amazon eBay |
| 43502-002 | Battery Charger | 1 | Service part / kit | Amazon eBay |
| 43502-004 | Fuel Shutoff Solenoid | 1 | Service part / kit | Amazon eBay |
| 43502-005 | Water Heater | 1 | Service part / kit | Amazon eBay |
Service, wear & replacement parts referenced for this model and its engine — confirm the exact part for your serial number. See the full parts catalog to search and cross-reference.
Available documents
Service manual — 43502 rev 2 (Westerbeke)