Volvo Penta 4-Stroke 320HP Marine Engine Parts

(15 products)

This page supports Volvo Penta 4‑Stroke 320 HP marine engines, helping you find compatible parts and practical service information. Below you’ll find maintenance tips, common replacement parts, and troubleshooting guidance. You can also browse the main Volvo Penta collection for a wider selection. Scroll to the bottom to start browsing parts for this engine, and remember you can use the “Filter & Sort” controls on the collection page to narrow results by horsepower, year range, and part category/section.

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How to Identify Your 320 HP Model

Locate the engine serial/nameplate on the starboard side of the engine block or on the top of the flame arrestor/engine cover; the drive unit has its own tag on the transom shield or upper gear housing.
Read the full model code and suffix: they often indicate fuel system (EFI/MPI), emissions package, and revision level. Suffix letters may also reflect cooling configuration or market region.
Confirm drive type and ratio (e.g., SX or DP sterndrive) printed on the drive tag; the ratio affects propeller selection and some seal/bearing kits.
For 4‑stroke gasoline V‑8 packages in the 320 HP class, verify ignition components, belt layout, and sensor types by serial to ensure parts compatibility across production years.

Engine Platform Overview

V‑8 Gasoline EFI Sterndrive/Inboard Package (~320 HP)

Feature	Description
Configuration	4‑stroke V‑8 gasoline engine with multi‑port fuel injection, raw‑water or closed‑cooling options; paired with SX or DP sterndrive.
Common Models	320 HP packages typically fall within modern EFI V‑8 families. Exact parts vary by serial, emissions package, and drive configuration.
Advantages	Strong mid‑range torque, smooth idle, good cold‑start performance, and robust charging output for onboard electronics.
Notes	Use engine and drive serial numbers to confirm ignition components, belt routing, raw‑water pump style, and sensor compatibility. Propeller selection depends on drive ratio and boat load.

Routine Maintenance & Service Parts

Intervals below are general guidelines for typical recreational use. Always follow the official Volvo Penta service schedule for your exact model and operating conditions.

Item	Interval*	Remarks	Parts Link
Engine oil + filter	First 20 hours, then every 100 hours or annually	Use marine‑rated oil; change hot. Replace the oil filter at each service.	Volvo Penta Service & Maintenance Kits
Gear oil (sterndrive)	Every 100 hours or annually; inspect mid‑season	Check for water intrusion and metal shavings; pressure/vacuum test after reseal.	Volvo Penta Lower Unit Seal Kits
Spark plugs	Inspect every 100 hours; replace 200–300 hours or as needed	Gap to spec; replace sooner for misfire, fouling, or hard starts.	Spark plug
Fuel filter / water separator	Every 100 hours or annually	Drain or replace to prevent lean conditions and power loss.	Volvo Penta Fuel filters
Raw‑water pump impeller / kit	Every 1–2 seasons, or at first sign of overheating	Replace proactively; inspect housing and wear plate for scoring.	Volvo Penta Water Pump Repair Kits
Anodes (zinc/aluminum/magnesium)	Inspect every 50 hours; replace when 50% depleted	Match alloy to water type (salt, brackish, fresh).	Volvo Penta Anodes
Serpentine/drive belt	Inspect every 100 hours; replace 300–400 hours or as needed	Look for cracking, glazing, or chirp under load; replace tensioner if noisy.	Belt
Propeller inspection	Check each outing; remove seasonally	Inspect for dings and hub wear; remove to check for fishing line around shaft and to grease splines.	Volvo Penta Propellers

Frequently Used Parts Categories

Routine Service: Volvo Penta Service & Maintenance Kits
Cooling System: Volvo Penta Water pumps and Volvo Penta Impellers
Fuel System: Volvo Penta Fuel filters
Ignition / Electrical: Volvo Penta Alternators and Volvo Penta Starters
Sensors & Electronics: Volvo Penta Sensors
Gaskets & Seals: Volvo Penta Gaskets and Volvo Penta Lower Unit Seal Kits
Corrosion Protection: Volvo Penta Anodes

Common Symptoms & Quick Checks

Symptom	Check First	Related Parts
Overheat alarm or high temperature	Inspect raw‑water intake screens, sea strainer, and impeller; verify coolant level on closed‑cooling systems; check thermostat.	Water pump repair kit, impeller, thermostat, hoses, anodes (for heat exchanger)
Hard starting or rough idle	Test battery voltage and connections; inspect spark plugs and plug wires; replace fuel filter/water separator; check idle‑air control and MAP/MAP‑related hoses.	Starter, spark plugs, fuel filter, sensors
Poor acceleration or loss of power	Verify clean propeller and correct pitch; check for clogged fuel filter; inspect belt slip and timing/ignition faults; confirm throttle opens fully.	Propeller, fuel filter, belt, sensors
Gearcase noise or milky gear oil	Drain and inspect oil for water/metal; check prop shaft for fishing line; pressure/vacuum test the drive for leaking seals and replace as needed.	Lower unit seal kit, propeller hub, anodes

FAQs

Are parts interchangeable across different years or platforms?

Some service parts cross over, but many items (sensors, ignition components, raw‑water pump style, and sterndrive seals) vary by engine and drive serial. Always confirm by serial and model code before ordering.

When should the raw‑water impeller be replaced?

Inspect each season and replace every 1–2 years for recreational use, or immediately if there is any sign of overheating, reduced flow, or vane cracking. Heavy use or sandy/silty water requires more frequent service.

How often should sterndrive gear oil be changed?

Typically every 100 hours or annually, with a mid‑season check for contamination. Change sooner if water intrusion, metal shavings, or burnt odor is found.

What information do you need to confirm part compatibility?

Provide the engine serial number, full model designation, drive model/ratio, and any relevant photos of the nameplate and the component you’re replacing. This ensures accurate matching of gaskets, sensors, and service kits.

Ready to find parts by horsepower, year, and model? Browse the main Volvo Penta collection for compatible components and service items.

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If you’re unsure about your model, send us a photo of the nameplate and the part you need and we’ll help verify compatibility.